AWS core services

AWS Core Services
Nagesh Ramamoorthy

IAM
EC2
VPC
S3
RDS
Cloud Watch

IAM
• IAM Features
• How IAM works? Infrastructure Elements
• Identities
• Access Management
• IAM Best Practices

Identity and
Access
Management
(IAM)
You use IAM to control who is authenticated
(signed in) and authorized (has permissions)
to use resources.
When you first create an AWS account, you
begin with a single sign-in identity that has
complete access to all AWS services and
resources in the account.
This identity is called the AWS account root
user and is accessed by signing in with the
email address and password that you used to
create the account

IAM Features
1. Shared access to your AWS account
2. Granular permissions
3. Secure access to AWS resources for
applications that run on Amazon EC2
4. Multi-factor authentication (MFA)
5. Identity federation
6. Identity information for assurance
7. PCI DSS Compliance
8.Integrated with many AWS services
9. Eventually Consistent
10. Free to use

How IAM
Works: IAM
Infrastructure
Elements
1. Principal 2. Request
3.
Authentication
4.
Authorization
5. Actions 6. Resources

Principal
A principal is an entity that can take an action on an AWS resource. AWS
Users, roles, federated users, and applications are all AWS principals.

Request
When a principal tries to use the AWS Management Console, the AWS API, or the AWS CLI, that
principal sends a request to AWS. A request specifies the following information:
• Actions (or operations) that the principal wants to perform
• Resources upon which the actions are performed
• Principal information, including the environment from which the request was made
AWS gathers this information into a request context, which is used to evaluate and authorize the
request.

Authentication
As a principal, you must be authenticated (signed in
to AWS) to send a request to AWS.
Alternatively, a few services, like Amazon S3, allow
requests from anonymous users
To authenticate from the console, you must sign in
with your user name and password.
To authenticate from the API or CLI, you must provide
your access key and secret key.
AWS recommends that you use multi-factor
authentication (MFA) to increase the security of your
account.

Authorization
 During authorization, IAM uses values from the request context
to check for matching policies and determine whether to allow
or deny the request.
 Policies are stored in IAM as JSON documents and specify the
permissions that are allowed or denied for principals
 If a single policy includes a denied action, IAM denies the entire
request and stops evaluating. This is called an explicit deny.
 The evaluation logic follows these rules:
 By default, all requests are denied.
 An explicit allow overrides this default.
 An explicit deny overrides any allows.

Actions
After your request has been authenticated and
authorized, AWS approves the actions in your
request.
Actions are defined by a service, and are the things
that you can do to a resource, such as viewing,
creating, editing, and deleting that resource.
For example, IAM supports around 40 actions for a
user resource, including the following actions:
• Create User
• Delete User
• GetUser
• UpdateUser

Resources
A resource is an entity that exists
within a service. Examples include an
Amazon EC2 instance, an IAM user,
and an Amazon S3 bucket.
After AWS approves the actions in
your request, those actions can be
performed on the related resources
within your account..

IAM Identities
You create IAM Identities to provide authentication for
people and processes in your AWS account.
 IAM Users
 IAM Groups
 IAM Roles

IAM Users
The IAM user represents the person or service who uses the IAM user to
interact with AWS.
When you create a user, IAM creates these ways to identify that user:
 A "friendly name" for the user, which is the name that you specified
when you created the user, such as Bob or Alice. These are the names
you see in the AWS Management Console
 An Amazon Resource Name (ARN) for the user. You use the ARN when
you need to uniquely identify the user across all of AWS, such as when
you specify the user as a Principal in an IAM policy for an Amazon S3
bucket. An ARN for an IAM user might look like the following:
arn:aws:iam::account-ID-without-hyphens:user/Bob
 A unique identifier for the user. This ID is returned only when you use
the API, Tools for Windows PowerShell, or AWS CLI to create the user;
you do not see this ID in the console

IAM Groups
Following are some important characteristics
of groups:
A group can
contain many
users, and a user
can belong to
multiple groups
Groups can't be
nested; they can
contain only users,
not other groups.
There's no default
group that
automatically
includes all users
in the AWS
account.
There's a limit to
the number of
groups you can
have, and a limit
to how many
groups a user can
be in.
An IAM group is a collection of IAM users. You
can use groups to specify permissions for a
collection of users, which can make those
permissions easier to manage for those users

IAM Roles
 An IAM role is very similar to a user, However, a role does not have
any credentials (password or access keys) associated with it.
 Instead of being uniquely associated with one person, a role is
intended to be assumable by anyone who needs it
 If a user assumes a role, temporary security credentials are created
dynamically and provided to the user.
 Roles can be used by the following:
• An IAM user in the same AWS account as the role
• An IAM user in a different AWS account as the role
• A web service offered by AWS such as Amazon Elastic
Compute Cloud (Amazon EC2)
• An external user authenticated by an external identity
provider (IdP) service that is compatible with SAML 2.0 or
OpenID Connect, or a custom-built identity broker

IAM User vs
Role
When to Create an IAM User (Instead of a Role):
• You created an AWS account and you're the only person who
works in your account.
• Other people in your group need to work in your AWS
account, and your group is using no other identity
mechanism.
• You want to use the command-line interface (CLI) to work
with AWS.
When to Create an IAM Role (Instead of a User) :
• You're creating an application that runs on an Amazon Elastic
Compute Cloud (Amazon EC2) instance and that application
makes requests to AWS
• You're creating an app that runs on a mobile phone and that
makes requests to AWS.
• Users in your company are authenticated in your corporate
network and want to be able to use AWS without having to
sign in again—that is, you want to allow users to federate into
AWS.

Access
Management
When a principal makes a request in AWS, the
IAM service checks whether the principal is
authenticated (signed in) and authorized (has
permissions)
You manage access by creating policies and
attaching them to IAM identities or AWS
resources

Policies
 Policies are stored in AWS as JSON documents attached to
principals as identity-based policies, or to resources as
resource-based policies
 A policy consists of one or more statements, each of which
describes one set of permissions.
 Here's an example of a simple policy.
{
"Version": "2012-10-17",
"Statement": {
"Effect": "Allow",
"Action": "s3:ListBucket",
"Resource": "arn:aws:s3:::example_bucket"
}
}

Identity Based
Policy
 Identity-based policies are permission policies that you can attach
to a principal (or identity), such as an IAM user, role, or group.
 These policies control what actions that identity can perform, on
which resources, and under what conditions.
 Identity-based policies can be further categorized:
• Managed policies – Standalone identity-based policies that
you can attach to multiple users, groups, and roles in your
AWS account. You can use two types of managed policies:
o AWS managed policies – Managed policies that are created
and managed by AWS. If you are new to using policies, we
recommend that you start by using AWS managed policies
o Customer managed policies – Managed policies that you
create and manage in your AWS account. Customer managed
policies provide more precise control over your policies than
AWS managed policies.
• Inline policies – Policies that you create and manage and that
are embedded directly into a single user, group, or role.

Resource
Based Policies
Resource-based policies are JSON policy
documents that you attach to a resource such
as an Amazon S3 bucket.
These policies control what actions a
specified principal can perform on that
resource and under what conditions
Resource-based policies are inline policies,
and there are no managed resource-based
policies.

Trust Policies
• Trust policies are resource-based
policies that are attached to a role
that define which principals can
assume the role.
• When you create a role in IAM,
the role must have two things: The
first is a trust policy that indicates
who can assume the role. The
second is a permission policy that
indicates what they can do with
that role

Summary : IAM
AWS IAM provides robust mechanism on how individual users are authenticated ,
authorized and provided granular access controls to resources
IAM policies allows to customize the access controls based on various conditions
IAM roles should be chosen where possible as there are further security and
administration advantages of roles
There are multiple identified security best practices to be followed to keep the
environments highly secured

EC2
• EC2 Features
• Amazon Machine Images
• Instances
• Monitoring
• Networking and Security
• Storage

EC2 Features
• Virtual computing environments, known as instances
• Preconfigured templates for your instances, known as Amazon Machine Images (AMIs), that
package the bits you need for your server (including the operating system and additional
software)
• Various configurations of CPU, memory, storage, and networking capacity for your instances,
known as instance types
• Secure login information for your instances using key pairs (AWS stores the public key, and you
store the private key in a secure place)
• Storage volumes for temporary data that's deleted when you stop or terminate your instance,
known as instance store volumes
• Metadata, known as tags, that you can create and assign to your Amazon EC2 resources

EC2 features (Contd..)
• Persistent storage volumes for your data using Amazon Elastic Block Store (Amazon EBS),
known as Amazon EBS volumes
• Multiple physical locations for your resources, such as instances and Amazon EBS
volumes, known as regions and Availability Zones
• A firewall that enables you to specify the protocols, ports, and source IP ranges that can
reach your instances using security groups
• Static IPv4 addresses for dynamic cloud computing, known as Elastic IP addresses
• Virtual networks you can create that are logically isolated from the rest of the AWS
cloud, and that you can optionally connect to your own network, known as virtual
private clouds (VPCs)

Amazon
Machine
Images ( AMI)
An AMI provides the
information required to launch
an instance, which is a virtual
server in the cloud.
You must specify a source
AMI when you launch an
instance
An AMI includes the
following:
A template for the root
volume for the instance (for
ex, an operating system, an
application server, and
applications)
Launch permissions that
control which AWS accounts
can use the AMI to launch
instances
A block device mapping that
specifies the volumes to
attach to the instance when
it's launched

AMI Life cycle
 After you create and register an AMI,
you can use it to launch new instances
 You can also launch instances from an
AMI if the AMI owner grants you
launch permissions.
 You can copy an AMI within the same
region or to different regions.
 When you no longer require an AMI,
you can deregister it.

AMI Types
• Region (see Regions
and Availability
Zones)
• Operating system
• Architecture (32-bit
or 64-bit)
• Launch Permissions
• Storage for the Root
Device
You can select
an AMI to use
based on the
following
characteristics:

Launch Permissions
 The owner of an AMI determines its availability by specifying launch
permissions.
• Launch permissions fall into the following categories:
• The owner
grants launch
permissions to
all AWS
accounts
Public
• The owner
grants launch
permissions to
specific AWS
accounts
Explicit
• The owner has
implicit launch
permissions for
an AMI.
Implicit

EC2 Root
Device
Volume
When you launch an instance, the root
device volume contains the image used to
boot the instance.
You can choose between AMIs backed by
Amazon EC2 instance store and AMIs
backed by Amazon EBS.
AWS recommend that you use AMIs backed
by Amazon EBS, because they launch faster
and use persistent storage.

Instance Store Backed Instances:
• Instances that use instance stores for the root device automatically have one or more instance
store volumes available, with one volume serving as the root device volume
• The data in instance stores is deleted when the instance is terminated or if it fails (such as if an
underlying drive has issues).
• Instance store-backed instances do not support the Stop action
• After an instance store-backed instance fails or terminates, it cannot be restored.
• If you plan to use Amazon EC2 instance store-backed instances
o distribute the data on your instance stores across multiple Availability Zones
o back up critical data on your instance store volumes to persistent storage on a regular basis

EBS Backed Instances:
• Instances that use Amazon EBS for the root device automatically have an Amazon EBS volume
attached
• An Amazon EBS-backed instance can be stopped and later restarted without affecting data stored
in the attached volumes.
• There are various instance and volume-related tasks you can do when an Amazon EBS-backed
instance is in a stopped state.
For example, you can modify the properties of the instance, you can change the size of your instance or update the
kernel it is using, or you can attach your root volume to a different running instance for debugging or any other
purpose

Instance
Types
When you launch an instance, the instance type
that you specify determines the hardware of the
host computer used for your instance.
Each instance type offers different compute,
memory, and storage capabilities and are grouped
in instance families based on these capabilities
Amazon EC2 dedicates some resources of the host
computer, such as CPU, memory, and instance
storage, to a particular instance.
Amazon EC2 shares other resources of the host
computer, such as the network and the disk
subsystem, among instances.

Available
Instance
Types
General Purpose : T2 , M5
Compute Optimised : C5
Memory Optimized : R4, X1
Storage Optimised: D2, H1, I3
Accelerated Computing: F1, G3, P3

Instance Purchasing Options
On-Demand Instances – Pay, by
the second, for the instances that
you launch.
Reserved Instances – Purchase, at
a significant discount, instances
that are always available, for a
term from one to three years
Scheduled Instances – Purchase
instances that are always
available on the specified
recurring schedule, for a one-year
term.
Spot Instances – Request unused
EC2 instances, which can lower
your Amazon EC2 costs
significantly.
Dedicated Hosts – Pay for a
physical host that is fully
dedicated to running your
instances, and bring your existing
per-socket, per-core, or per-VM
software licenses to reduce costs.
Dedicated Instances – Pay, by the
hour, for instances that run on
single-tenant hardware.

Security
Groups
A security group acts as a virtual firewall that
controls the traffic for one or more instances.
When you launch an instance, you associate one
or more security groups with the instance.
You add rules to each security group that allow
traffic to or from its associated instances
When you specify a security group as the source
or destination for a rule, the rule affects all
instances associated with the security group

SG Rules
• For each rule, you specify the following:
o Protocol: The protocol to allow. The most common protocols are 6 (TCP) 17 (UDP), and 1
(ICMP).
o Port range : For TCP, UDP, or a custom protocol, the range of ports to allow. You can
specify a single port number (for example, 22), or range of port numbers
o Source or destination: The source (inbound rules) or destination (outbound rules) for the
traffic.
o (Optional) Description: You can add a description for the rule; for example, to help you
identify it later.

SG Rules Characteristics
By default, security groups allow all outbound traffic.
You can't change the outbound rules for an EC2-Classic security group.
Security group rules are always permissive; you can't create rules that deny access.
Security groups are stateful — if you send a request from your instance, the response traffic for that request is allowed to
flow in regardless of inbound security group rules.
You can add and remove rules at any time. Your changes are automatically applied to the instances associated with the
security group after a short period
When you associate multiple security groups with an instance, the rules from each security group are effectively aggregated
to create one set of rules to determine whether to allow access

Instance IP addressing
 Every instance is assigned with IP addresses and IPv4 DNS hostnames by AWS
using DHCP
 Amazon EC2 and Amazon VPC support both the IPv4 and IPv6 addressing
protocols
 By default, Amazon EC2 and Amazon VPC use the IPv4 addressing protocol;
you can't disable this behavior.
 Types Of IP addresses available for EC2:
o Private IP4 addresses
o Public V4 addresses
o Elastic IP addresses
o IPV6 addresses

Private IPV4
addresses
A private IPv4 address is an IP address that's not reachable
over the Internet.
You can use private IPv4 addresses for communication
between instances in the same network
When you launch an instance, AWS allocate a primary
private IPv4 address for the instance from the subnet
Each instance is also given an internal DNS hostname that
resolves to the primary private IPv4 address
A private IPv4 address remains associated with the
network interface when the instance is stopped and
restarted, and is released when the instance is terminated

Public IPV4
addresses
A public IP address is an IPv4 address that's reachable from the
Internet.
You can use public addresses for communication between your
instances and the Internet.
Each instance that receives a public IP address is also given an
external DNS hostname
A public IP address is assigned to your instance from Amazon's pool of
public IPv4 addresses, and is not associated with your AWS account
You cannot manually associate or disassociate a public IP address
from your instance

Public IP Behavior
• You can control whether your instance in a VPC receives a public IP address by doing the
following:
• Modifying the public IP addressing attribute of your subnet
• Enabling or disabling the public IP addressing feature during launch, which overrides the
subnet's public IP addressing attribute
• In certain cases, AWS release the public IP address from your instance, or assign it a new one:
• when an instance is stopped or terminated. Your stopped instance receives a new public IP
address when it's restarted.
• when you associate an Elastic IP address with your instance, or when you associate an Elastic
IP address with the primary network interface (eth0) of your instance in a VPC.

Elastic IP addresses
An Elastic IP address is a static IPv4 address designed for dynamic cloud computing
An Elastic IP address is associated with your AWS account.
With an Elastic IP address, you can mask the failure of an instance or software by rapidly remapping the
address to another instance in your account
An Elastic IP address is a public IPv4 address, which is reachable from the internet
By default, all AWS accounts are limited to five (5) Elastic IP addresses per region, because public (IPv4)
internet addresses are a scarce public resource

Elastic IP characteristics
To use an Elastic IP address, you first allocate one to your account, and then associate it with your instance or a network
interface
You can disassociate an Elastic IP address from a resource, and reassociate it with a different resource
A disassociated Elastic IP address remains allocated to your account until you explicitly release it
AWS impose a small hourly charge if an Elastic IP address is not associated with a running instance, or if it is associated with a
stopped instance or an unattached network interface
While your instance is running, you are not charged for one Elastic IP address associated with the instance, but you are
charged for any additional Elastic IP addresses associated with the instance
An Elastic IP address is for use in a specific region only

Summary : EC2
AWS EC2 is feature rich to provide scalable, secured and cost effective compute resources in the cloud.
Amazon machine Images ( AMI) further simplifies the Instance creation process and time required to
launch instances.
Understand the difference between the two major storage options for root devices : instance stores vs
EBS volumes
Security Groups acts as virtual firewalls for a single or group of instances in your AWS account
AWS provides various IP address types like Private, Public and Elastic IP address
AWS provides various purchasing options for EC2 to choose based on business criticality or the budget
and availability constraints

VPC
• VPC And Subnets
• Security in VPC
• VPC components
• Elastic Interfaces
• Routing Tables
• Internet Gateways
• NAT
• DHCP Options Sets
• VPC Peering
• VPC endpoints

VPC
Amazon Virtual Private Cloud (Amazon VPC) enables you to
launch AWS resources into a virtual network that you've
defined.
This virtual network closely resembles a traditional
network that you'd operate in your own data center, with
the benefits of using the scalable infrastructure of AWS.
Amazon VPC is the networking layer for Amazon EC2.
A virtual private cloud (VPC) is a virtual network dedicated
to your AWS account
You can configure your VPC by modifying its IP address
range, create subnets, and configure route tables, network
gateways, and security settings

Subnet
A subnet is a range of IP addresses in your VPC.
You can launch AWS resources into a specified subnet
Use a public subnet for resources that must be connected to the internet, and a
private subnet for resources that won't be connected to the internet
To protect the AWS resources in each subnet, you can use multiple layers of
security, including security groups and network access control lists (ACL)

Default VPC and subnets
Your account comes with a default VPC that has a default subnet in each Availability Zone
A default VPC has the benefits of the advanced features provided by EC2-VPC, and is ready for you to use
If you have a default VPC and don't specify a subnet when you launch an instance, the instance is launched into your
default VPC
You can launch instances into your default VPC without needing to know anything about Amazon VPC.
You can create your own VPC, and configure it as you need. This is known as a nondefault VPC
By default, a default subnet is a public subnet, receive both a public IPv4 address and a private IPv4 address

Default VPC Components
When we create a default VPC, AWS do the following to set it up for you:
o Create a VPC with a size /16 IPv4 CIDR block (172.31.0.0/16). This provides up to 65,536
private IPv4 addresses.
o Create a size /20 default subnet in each Availability Zone. This provides up to 4,096 addresses
per subnet
o Create an internet gateway and connect it to your default VPC
o Create a main route table for your default VPC with a rule that sends all IPv4 traffic destined
for the internet to the internet gateway
o Create a default security group and associate it with your default VPC
o Create a default network access control list (ACL) and associate it with your default VPC
o Associate the default DHCP options set for your AWS account with your default VPC.

Security in VPC
Flow
Logs
NACL
Security
Group

Security Group vs Network ACL
•=> Operates at the instance level (first layer
of defense)
•=> Supports allow rules only
•=> Is stateful: Return traffic is automatically
allowed, regardless of any rules
•=> AWS evaluate all rules before deciding
whether to allow traffic
•=> Applies to an instance only if someone
specifies the security group when launching
the instance
•=> Operates at the subnet level (second
layer of defense)
=> Supports allow rules and deny rules
=> Is stateless: Return traffic must be
explicitly allowed by rules
=> AWS process rules in number order
when deciding whether to allow traffic
=> Automatically applies to all instances in
the subnets it's associated with
SecurityGroup
NetworkACL

Elastic
Network
instances
Each instance in your VPC has a default network interface (the primary
network interface) that is assigned a private IPv4 address
You cannot detach a primary network interface from an instance. You
can create and attach an additional network interface to any instance
in your VPC
You can create a network interface, attach it to an instance, detach it
from an instance, and attach it to another instance
A network interface's attributes follow it as it is attached or detached
from an instance and reattached to another instance
Attaching multiple network interfaces to an instance is useful when
you want to:
• Create a management network.
• Use network and security appliances in your VPC.
• Create dual-homed instances with workloads/roles on distinct subnets
• Create a low-budget, high-availability solution.

Routing Table • A route table contains a set of rules, called routes, that are used to
determine where network traffic is directed
• Your VPC has an implicit router.
• Your VPC automatically comes with a main route table that you can
modify.
• You can create additional custom route tables for your VPC
• Each subnet in your VPC must be associated with a route table; the
table controls the routing for the subnet
• A subnet can only be associated with one route table at a time, but
you can associate multiple subnets with the same route table
• If you don't explicitly associate a subnet with a particular route
table, the subnet is implicitly associated with the main route table.
• You cannot delete the main route table, but you can replace the
main route table with a custom table that you've created
• Every route table contains a local route for communication within
the VPC over IPv4.

Internet
Gateway
• An Internet gateway is a horizontally scaled, redundant, and highly
available VPC component that allows communication between
instances in your VPC and the Internet
• It therefore imposes no availability risks or bandwidth constraints
on your network traffic
• An Internet gateway supports IPv4 and IPv6 traffic.
• To enable access to or from the Internet for instances in a VPC
subnet, you must do the following:
• Attach an Internet gateway to your VPC.
• Ensure that your subnet's route table points to the Internet
gateway.
• Ensure that instances in your subnet have a globally unique IP
address (public IPv4 address, Elastic IP address, or IPv6
address)
• Ensure that your network access control and security group
rules allow the relevant traffic to flow to and from your
instance.

NAT
• You can use a NAT device to enable instances in a private subnet to
connect to the Internet or other AWS services, but prevent the
Internet from initiating connections with the instances.
• A NAT device forwards traffic from the instances in the private
subnet to the Internet or other AWS services, and then sends the
response back to the instances
• When traffic goes to the Internet, the source IPv4 address is
replaced with the NAT device’s address and similarly, when the
response traffic goes to those instances, the NAT device translates
he address back to those instances’ private IPv4 addresses.
• AWS offers two kinds of NAT devices—a NAT gateway or a NAT
instance.
• AWS recommend NAT gateways, as they provide better availability
and bandwidth over NAT instances
• The NAT Gateway service is also a managed service that does not
require your administration efforts
• A NAT instance is launched from a NAT AMI.

DHCP Option
sets
• The DHCP options provides a standard for passing configuration
information to hosts on a TCP/IP network such as domain name,
domain name server, NTP servers.
• DHCP options sets are associated with your AWS account so
that you can use them across all of your virtual private clouds
(VPC)
• After you create a set of DHCP options, you can't modify them
• If you want your VPC to use a different set of DHCP options, you
must create a new set and associate them with your VPC
• You can also set up your VPC to use no DHCP options at all.
• You can have multiple sets of DHCP options, but you can
associate only one set of DHCP options with a VPC at a time
• After you associate a new set of DHCP options with a VPC, any
existing instances and all new instances use these options
within few hours.

VPC Peering
• A VPC peering connection is a networking
connection between two VPCs that enables
you to route traffic between them privately
• Instances in either VPC can communicate with
each other as if they are within the same
network.
• You can create a VPC peering connection
between your own VPCs, with a VPC in
another AWS account, or with a VPC in a
different AWS Region
• There should not be any overlapping of IP
addresses as a pre-requisite for setting up the
VPC peering

VPC Endpoints
• A VPC endpoint enables you to privately connect your VPC to supported AWS
services and VPC endpoint services powered by PrivateLink without requiring an
internet gateway
• Instances in your VPC do not require public IP addresses to communicate with
resources in the service.
• Traffic between your VPC and the other service does not leave the Amazon
network
• Endpoints are horizontally scaled, redundant, and highly available VPC
components without imposing availability risks or bandwidth constraints on your
network traffic
There are two types of VPC endpoints based on the supported target services:
1. Interface endpoint interfaces : An elastic network interface with a private IP
address that serves as an entry point for traffic destined to a supported service
2. Gateway endpoint interfaces : A gateway that is a target for a specified route
in your route table, used for traffic destined to a supported AWS service.

Summary : VPC
VPCs and Subnets enables individual AWS accounts to have their own virtual networks to
launch AWS resources in a private and secured environment
VPC components like Internet gateway , routing table , DHCP Option sets makes AWS
VPC and subnets works as similar as traditional network environment with routing ,
Internet and DNS capabilities
NACL, Security Groups and Flow logs makes VPC resources highly secured.
VPC peering enables communication between two or more isolated VPCs
VPC Endpoints enables the VPC resources communicate with AWS services directly using
AWS backbone network instead of Public internet

S3
• S3 features
• Key Concepts
• Storage classes
• Versioning
• Managing access

S3
Amazon Simple Storage Service is
storage for the Internet.
It is designed to make web-scale
computing easier for developers.
S3 is designed to provide
99.999999999% durability and 99.99%
availability of objects over a given year

S3 features
Storage Classes
Bucket Policies & Access Control Lists
Versioning
Data encryption
Lifecycle Management
Cross Region Replication
S3 transfer Accelaration
Requester pays
S3 anaylitics and Inventory

Key Concepts : Objects
 Objects are the fundamental entities stored in Amazon S3
 An object consists of the following:
o Key – The name that you assign to an object. You use the object key to retrieve the object.
o Version ID – Within a bucket, a key and version ID uniquely identify an object. The version ID
is a string that Amazon S3 generates when you add an object to a bucket.
o Value – The content that you are storing. An object value can be any sequence of bytes.
Objects can range in size from zero to 5 TB
o Metadata – A set of name-value pairs with which you can store information regarding the
object. You can assign metadata, referred to as user-defined metadata
o Access Control Information – You can control access to the objects you store in Amazon S3

Key Concepts : Buckets
 A bucket is a container for objects stored in Amazon S3.
 Every object is contained in a bucket.
 Amazon S3 bucket names are globally unique, regardless of the AWS Region in which you create
the bucket.
 A bucket is owned by the AWS account that created it.
 Bucket ownership is not transferable;
 There is no limit to the number of objects that can be stored in a bucket and no difference in
performance whether you use many buckets or just a few
 You cannot create a bucket within another bucket.

Key Concepts : Object key
 Every object in Amazon S3 can be uniquely addressed through the combination of the web
service endpoint, bucket name, key, and optionally, a version.
 For example, in the URL http://doc.s3.amazonaws.com/2006-03-01/AmazonS3.wsdl, "doc" is
the name of the bucket and "2006-03-01/AmazonS3.wsdl" is the key.

Storage Class
Each object in Amazon S3 has a
storage class associated with it.
Amazon S3 offers the following
storage classes for the objects that
you store
• STANDARD
• STANDARD_IA
• GLACIER

Standard class
This storage class is ideal for performance-sensitive use cases and frequently
accessed data.
STANDARD is the default storage class; if you don't specify storage class at the time
that you upload an object, Amazon S3 assumes the STANDARD storage class.
Designed for Durability : 99.999999999%
Designed for Availability : 99.99%

Standard_IA class
This storage class (IA, for infrequent access) is optimized for long-lived and less frequently accessed data
for example backups and older data where frequency of access has diminished, but the use case still demands high
performance.
There is a retrieval fee associated with STANDARD_IA objects which makes it most suitable for infrequently accessed data.
The STANDARD_IA storage class is suitable for larger objects greater than 128 Kilobytes that you want to keep for at least 30
days
Designed for durability : 99.999999999%

Glacier
• The GLACIER storage class is suitable for archiving data where data access is infrequent
• Archived objects are not available for real-time access. You must first restore the objects
before you can access them.
• You cannot specify GLACIER as the storage class at the time that you create an object.
• You create GLACIER objects by first uploading objects using STANDARD, RRS, or
STANDARD_IA as the storage class. Then, you transition these objects to the GLACIER
storage class using lifecycle management.
• You must first restore the GLACIER objects before you can access them
• Designed for durability : 99.999999999%
• Designed for Availability : 99.99%

Reduced_Redundance
Storage class
RRS storage class is designed for noncritical, reproducible
data stored at lower levels of redundancy than the
STANDARD storage class.
if you store 10,000 objects using the RRS option, you can, on
average, expect to incur an annual loss of a single object per
year (0.01% of 10,000 objects)
Amazon S3 can send an event notification to alert a user or
start a workflow when it detects that an RRS object is lost
Designed for durability : 99.99%

Lifecycle Management
• Using lifecycle configuration rules, you can direct S3 to tier down the storage
classes, archive, or delete the objects during their lifecycle.
• The configuration is a set of one or more rules, where each rule defines an action
for Amazon S3 to apply to a group of objects
• These actions can be classified as follows:
Transition
• In which you define when objects transition to another storage
class.
Expiration
• In which you specify when the objects expire. Then Amazon S3
deletes the expired objects on your behalf.

When Should I Use Lifecycle Configuration?
If you are uploading periodic logs to your bucket, your application might need these logs for a week
or a month after creation, and after that you might want to delete them.
Some documents are frequently accessed for a limited period of time. After that, these documents
are less frequently accessed. Over time, you might not need real-time access to these objects, but
your organization or regulations might require you to archive them for a longer period
You might also upload some types of data to Amazon S3 primarily for archival purposes, for
example digital media archives, financial and healthcare records etc

Versioning
• Versioning enables you to keep multiple versions of an object in one bucket.
• Once versioning is enabled, it can’t be disabled but can be suspended
• Enabling and suspending versioning is done at the bucket level
• You might want to enable versioning to protect yourself from unintended overwrites and
deletions or to archive objects so that you can retrieve previous versions of them
• You must explicitly enable versioning on your bucket. By default, versioning is disabled
• Regardless of whether you have enabled versioning, each object in your bucket has a
version ID

Versioning (contd..)
• If you have not enabled versioning, then Amazon S3 sets the version ID value to null.
• If you have enabled versioning, Amazon S3 assigns a unique version ID value for the
object
• An example version ID is 3/L4kqtJlcpXroDTDmJ+rmSpXd3dIbrHY+MTRCxf3vjVBH40Nr8X8gdRQBpUMLUo. Only
Amazon S3 generates version IDs. They cannot be edited.
• When you enable versioning on a bucket, existing objects, if any, in the bucket are
unchanged: the version IDs (null), contents, and permissions remain the same

Versioning : PUT
Operation
• When you PUT an object in a versioning-enabled
bucket, the noncurrent version is not overwritten.
• The following figure shows that when a new version
of photo.gif is PUT into a bucket that already
contains an object with the same name, S3
generates a new version ID (121212), and adds the
newer version to the bucket.

Versioning : DELETE
Operation
• When you DELETE an object, all versions remain in
the bucket and Amazon S3 inserts a delete marker.
• The delete marker becomes the current version of
the object. By default, GET requests retrieve the
most recently stored version. Performing a simple
GET Object request when the current version is a
delete marker returns a 404 Not Found error
• You can, however, GET a noncurrent version of an
object by specifying its version ID
• You can permanently delete an object by specifying
the version you want to delete.

Managing access
• By default, all Amazon S3 resources—buckets, objects, and
related subresources are private : only the resource owner, an
AWS account that created it, can access the resource.
• The resource owner can optionally grant access permissions to
others by writing an access policy
• Amazon S3 offers access policy options broadly categorized as
resource-based policies and user policies.
• Access policies you attach to your resources are referred to
as resource-based policies. For example, bucket policies and
access control lists (ACLs) are resource-based policies.
• You can also attach access policies to users in your account.
These are called user policies

Resource Owner
• The AWS account that you use to create buckets and objects owns those
resources.
• If you create an IAM user in your AWS account, your AWS account is the
parent owner. If the IAM user uploads an object, the parent account, to
which the user belongs, owns the object.
• A bucket owner can grant cross-account permissions to another AWS
account (or users in another account) to upload objects
• In this case, the AWS account that uploads objects owns those objects. The
bucket owner does not have permissions on the objects that other accounts
own, with the following exceptions:
• The bucket owner pays the bills. The bucket owner can deny access to
any objects, or delete any objects in the bucket, regardless of who
owns them
• The bucket owner can archive any objects or restore archived objects
regardless of who owns them

When to Use an ACL-based Access Policy
An object ACL is the only way to manage access to objects
not owned by the bucket owner
Permissions vary by object and you need to manage
permissions at the object level
Object ACLs control only object-level permissions

Summary : S3
Objects are fundamental entities in S3 and buckets are object containers
AWS offers S3 storage classes like standard, standard_IA, RRS and Glacier to
choose depending on availability vs durability objectives and Cost Trade offs
Bucket , IAM policies and ACL enables the bucket owner to provide access to
other users which is denied by default
Versioning bucket level feature provides additional protection from unwanted
object deletion or overwrites.

RDS
• RDS features
• DB Instances
• High Availability ( Multi-AZ)
• Read Replicas
• Parameter Groups
• Backup & Restore
• Monitoring
• RDS Security

RDS
Amazon Relational Database
Service (Amazon RDS) is a web
service that makes it easier to set
up, operate, and scale a relational
database in the cloud.
It provides cost-efficient, resizable
capacity for an industry-standard
relational database and manages
common database administration
tasks

RDS features
• When you buy a server, you get CPU, memory, storage, and IOPS, all bundled together. With Amazon RDS, these
are split apart so that you can scale them independently
• Amazon RDS manages backups, software patching, automatic failure detection, and recovery.
• To deliver a managed service experience, Amazon RDS doesn't provide shell access to DB instances
• You can have automated backups performed when you need them, or manually create your own backup snapshot.
• You can get high availability with a primary instance and a synchronous secondary instance that you can fail over to
when problems occur
• You can also use MySQL, MariaDB, or PostgreSQL Read Replicas to increase read scaling.
• In addition to the security in your database package, you can help control who can access your RDS databases by
using AWS Identity and Access Management (IAM)
• Supports the popular engines : MySQL, MariaDB, PostgreSQL, Oracle, Microsoft SQL Server, and the new, MySQL-
compatible Amazon Aurora DB engine

DB instances
• The basic building block of Amazon RDS is the DB
instance
• A DB instance can contain multiple user-created
databases, and you can access it by using the same
tools and applications that you use with a stand-
alone database instance
• Each DB instance runs a DB engine. Amazon RDS
currently supports the MySQL, MariaDB,
PostgreSQL, Oracle, and Microsoft SQL Server DB
engines
• When creating a DB instance, some database
engines require that a database name be specified.
• Amazon RDS creates a master user account for your
DB instance as part of the creation process

DB instance
Class
• The DB instance class determines the computation
and memory capacity of an Amazon RDS DB
instance
• Amazon RDS supports three types of instance
classes: Standard, Memory Optimized, and
Burstable Performance.
• DB instance storage comes in three types: Magnetic,
General Purpose (SSD), and Provisioned IOPS
(PIOPS).
Standard DB instance classes : db.m4,db.m3, db.m1
Memory Optimized DB instance classes: db.r4, db.r3,
Burstable Performance DB instance class: db.t2

High Availability (Multi-AZ)
• Amazon RDS provides high availability and failover support
for DB instances using Multi-AZ deployments
• In a Multi-AZ deployment, Amazon RDS automatically
provisions and maintains a synchronous standby replica in a
different Availability Zone
• The high-availability feature is not a scaling solution for read-
only scenarios; you cannot use a standby replica to serve read
traffic.
• DB instances using Multi-AZ deployments may have increased
write and commit latency compared to a Single-AZ
deployment

Failover Process for Amazon RDS
• In the event of a planned or unplanned outage of your DB instance, RDS
automatically switches to a standby replica in another Availability Zone
• Failover times are typically 60-120 seconds. However, large transactions or a
lengthy recovery process can increase failover time
• The failover mechanism automatically changes the DNS record of the DB instance
to point to the standby DB instance
• As a result, you need to re-establish any existing connections to your DB instance.

Failover Cases
• The primary DB instance switches over automatically to the standby replica if any of the
following conditions occur:
o An Availability Zone outage
o The primary DB instance fails
o The DB instance's server type is changed
o The operating system of the DB instance is undergoing software patching
o A manual failover of the DB instance was initiated using Reboot with failover

Read Replicas
You can reduce the load on your source DB instance by routing read queries from your applications to the Read
Replica
Amazon RDS takes a snapshot of the source instance and creates a read-only instance from the snapshot
Amazon RDS then uses the asynchronous replication method for the DB engine to update the Read Replica whenever
there is a change to the source DB instance
The Read Replica operates as a DB instance that allows only read-only connections.
Applications connect to a Read Replica the same way they do to any DB instance
you must enable automatic backups on the source DB instance

Read Replica Use cases
• Scaling beyond the compute or I/O capacity of a single DB instance for
read-heavy database workloads
• Serving read traffic while the source DB instance is unavailable.
• Business reporting or data warehousing scenarios where you might want
business reporting queries to run against a Read Replica

Cross Region Replication
You can create a MySQL, PostgreSQL, or MariaDB Read
Replica in a different AWS Region :
o Improve your disaster recovery capabilities
o Scale read operations into an AWS Region closer to
your users
o Make it easier to migrate from a data center in one
AWS Region to a data center in another AWS Region

DB Parameter Group
You manage your DB engine configuration through the use of parameters in a DB
parameter group
DB parameter groups act as a container for engine configuration values that are
applied to one or more DB instances
A default DB parameter group is created if you create a DB instance without
specifying a customer-created DB parameter group
This default group contains database engine defaults and Amazon RDS system
defaults based on the engine, compute class, and allocated storage of the instance

Modifying
Parameter
Group
You cannot modify the parameter settings of a
default DB parameter group
you must create your own DB parameter group to
change parameter settings from their default value
When you change a dynamic parameter and save the
DB parameter group, the change is applied
immediately
When you change a static parameter and save the DB
parameter group, the parameter change will take
effect after you manually reboot the DB instance
When you change the DB parameter group
associated with a DB instance, you must manually
reboot the instance

Backup and Restore
• Amazon RDS creates a storage volume snapshot of your DB instance, backing up the
entire DB instance and not just individual databases
• Amazon RDS saves the automated backups of your DB instance according to the backup
retention period that you specify
• If necessary, you can recover your database to any point in time during the backup
retention period
• You can also backup your DB instance manually, by manually creating a DB snapshot
• All automated backups are deleted when you delete a DB instance.
• Manual snapshots are not deleted

Backup
Window
Automated backups occur daily during the preferred backup window
The backup window can't overlap with the weekly maintenance window
for the DB instance
I/O activity is not suspended on your primary during backup for Multi-AZ
deployments, because the backup is taken from the standby
If you don't specify a preferred backup window when you create the DB
instance, Amazon RDS assigns a default 30-minute backup window
You can set the backup retention period to between 1 and 35 days
An outage occurs if you change the backup retention period from 0 to a
non-zero value or from a non-zero value to 0

Monitoring
You can use the following automated monitoring tools to watch Amazon RDS and
report when something is wrong:
o Amazon RDS Events
o Database log files
o Amazon RDS Enhanced Monitoring

RDS Security
Various ways you can secure RDS:
• Run your DB instance in an Amazon Virtual Private Cloud
(VPC)
• Use AWS Identity and Access Management (IAM) policies to
assign permissions that determine who is allowed to
manage RDS resources
• Use security groups to control what IP addresses or Amazon
EC2 instances can connect to your databases on a DB
instance
• Use Secure Socket Layer (SSL) connections with DB instances
• Use RDS encryption to secure your RDS instances and
snapshots at rest.
• Use the security features of your DB engine to control who
can log in to the databases on a DB instance

Summary : RDS
RDS is a fully managed relational database that manages backups, software
patching, automatic failure detection, and recovery on its own
RDS offers High availability through Multi-AZ deployment and “Read replicas” to
offload the read traffics to the database.
Parameter and Option Groups allows to configure the database and enable few
Engine specific features
RDS provides both daily automatic backups and manual snapshots when
required.

CloudWatch
• Introduction
• Concepts
• Dashboard
• CloudWatch Agent

Introduction
• Amazon CloudWatch is basically a
metrics repository
• An AWS service—such as Amazon
EC2—puts metrics into the
repository, and you retrieve statistics
based on those metrics
• If you put your own custom metrics
into the repository, you can retrieve
statistics on these metrics as well

Concepts
Namespaces
Metrics
Dimensions
Statistics
Alarms

Metrics
• Metrics are the fundamental concept in CloudWatch
• For example, the CPU usage of a particular EC2 instance is one metric provided by Amazon EC2
• A metric represents a time-ordered set of data points that are published to CloudWatch
• You can add the data points in any order, and at any rate you choose
• Metrics exist only in the region in which they are created
• Metrics cannot be deleted, but they automatically expire after 15 months if no new data is
published to them
• Data points older than 15 months expire on a rolling basis
• Metrics are uniquely defined by a name, a namespace, and zero or more dimensions

Metrics
Retention
• Data points with a period of less
than 60 seconds are available
for 3 hours. These data points
are high-resolution custom
metrics
• Data points with a period of 60
seconds (1 minute) are available
for 15 days
• Data points with a period of 300
seconds (5 minute) are available
for 63 days
• Data points with a period of
3600 seconds (1 hour) are
available for 455 days (15
months)

Namespaces
A namespace is a container for CloudWatch metrics
Metrics in different namespaces are isolated from each other, so that metrics from
different applications are not mistakenly aggregated into the same statistics
There is no default namespace. You must specify a namespace for each data point
you publish to CloudWatch
The AWS namespaces use the following naming convention: AWS/service. For
example, Amazon EC2 uses the AWS/EC2 namespace.

Dimension
A dimension is a name/value pair that uniquely identifies a metric.
You can assign up to 10 dimensions to a metric.
Every metric has specific characteristics that describe it, and you
can think of dimensions as categories for those characteristics
AWS services that send data to CloudWatch attach dimensions to
each metric.
You can use dimensions to filter the results that CloudWatch
returns
For example, you can get statistics for a specific EC2 instance by
specifying the InstanceId dimension when you search for metrics

Statistics
• Statistics are metric data aggregations over
specified periods of time
• Aggregations are made using the namespace,
metric name, dimensions, and the data point
unit of measure, within the time period you
specify
• Various statistics include "minimum",
"maximum", "Sum", "Average".
• Each statistic has a unit of measure. Example
units include Bytes, Seconds, Count, and
Percent.
• A period is the length of time associated with a
specific Amazon CloudWatch statistic
• A period can be as short as one second or as
long as one day (86,400 seconds). The default
value is 60 seconds

Alarms
• You can use an alarm to automatically initiate actions on your behalf
• An alarm watches a single metric over a specified time period, and performs one or more
specified actions, based on the value of the metric relative to a threshold over time
• The action is a notification sent to an Amazon SNS topic or an Auto Scaling policy. You can
also add alarms to dashboards
• Alarms invoke actions for sustained state changes only. The state must have changed and
been maintained for a specified number of periods

Dashboard
Amazon CloudWatch dashboards are
customizable home pages in the
CloudWatch console
You can use to monitor your resources in
a single view, even those resources that
are spread across different regions.
You can use CloudWatch dashboards to
create customized views of the metrics
and alarms for your AWS resources

CloudWatch Agents
The unified CloudWatch agent enables you to do the following:
• Collect more system-level metrics from Amazon EC2 instances in addition to
the metrics listed in Amazon EC2 Metrics and Dimensions
• Collect system-level metrics from on-premises servers. These can include
servers in a hybrid environment as well as servers not managed by AWS
• Collect logs from Amazon EC2 instances and on-premises servers, running
either Linux or Windows Server

Summary : CloudWatch
CloudWatch is a metrics repository , you can retrieve statistics based on these
metrics
Metrics are uniquely defined by a name, a namespace, and zero or more
dimensions
An alarm watches a single metric over a specified time period, and performs one
or more specified actions, based on the value of the metric
CloudWatch agents allows to monitor on premise servers and generate custom
metrics

AWS core services

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