Building Bizweb Microservices with Docker
- 3. Bizweb Microservices Components
• Based on Spring Boot & Netflix OSS
• Service Discovery: Eureka (Server), Ribbon (Client)
• API Gateway: Zuul
• Centralized Configuration: Spring Cloud Config
• API Security: Spring Security & Spring Security OAuth
• REST API: Spring Boot
• Job Service: Kafka & Spring Boot
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- 5. Eureka Service Discovery
• Each service has unique serviced
• Service uses Eureka Client to interact
with Eureka Server:
• Register: serviceId, host, port
• Renew: using heartbeats to check status
• Get Registry: return list host:port of
services by serviceId
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- 6. Zuul API Gateway
• Single entry point for clients to call API
• Edge service: not use to call between microservices
• Using Ribbon to call microservices
• Client Load Balancer
• Caching
• Fault tolerance
• Zuul Filter:
• Handle request in pipeline mode
• PRE, ROUTING, POST, ERROR
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- 9. Problems
• Take times to deploy on new servers:
• Install Java
• Copy fat .jar file (~75-100MB) using FTP/SCP
• Make script to run as a Linux service
• Take times to update services:
• 20 microservices + job services
• Manual update on multiple hosts
• Manual scale & choose server to deploy
• Quite hard to monitor these microservices
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- 11. Simple Dockerfile for all services
FROM frolvlad/alpine-oraclejdk8:slim
ADD lib lib
ADD product.jar app.jar
RUN sh -c 'touch /app.jar'
ENTRYPOINT ["java","-Xmx128m","-Xms128m","-
Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]
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- 12. Docker Swarm Mode
• Built-In Orchestration
• Easy to start
docker swarm init
docker services create --name product product:1.2.0
• Secure by default
docker swarm join --token [manager_token|worker_token]
• Easy to scale
docker service scale product=10
• Rolling updates
docker service update --update-delay 1m --update-parallelism 2
--image product:1.2.1 product
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- 14. Swarm Manager & Worker
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• Maintaining cluster state
• Scheduling services
• Use RAFT consensus to elect new leader
- 15. Swarm Manager & Worker
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• Pull tasks from Managers
• Receive tasks in batch (100ms or 100 tasks)
• Manager node can be worker, too
- 16. Combine Netflix OSS with Docker Swarm
• Zuul for API Gateway
• Eureka for Service Discovery
• Ribbon Client for direct call between microservices
• Docker Swarm:
• Manage microservices
• Deploy, scale, update microservices
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- 17. Docker Swarm Deployment
• 3 manager nodes on 3 different physical machines
• Workers on Physical & Virtual Machines
• Using overlay network:
• Communicate with Eureka Server
• Direct call between microservices
• Label for services & environment:
• INFRASTRUCTURE: running Zuul, Eureka, Config, OAuth Service
• SERVICE: running microservices
• JOB: running Job services
• DEV: running all containers of dev environment
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- 18. Docker Swarm Cluster
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swarm manager
(primary)
config server
eureka server
zuul server
swarm manager
(secondary)
config server
eureka server
zuul server
swarm manager
(secondary)
config server
eureka server
zuul server
worker-01
microservice-02
microservice-xx
microservice-01
worker-xx
microservice-02
microservice-xx
microservice-01
worker-job
job-02
job-xx
job-01
oauth server oauth server oauth server
Bizweb Overlay Network
server-01
redis
INFRASTRUCTUREINFRASTRUCTUREINFRASTRUCTURE
SERVICE SERVICE JOB
worker-dev
job-yy
microservices-xx
DEV
Docker Swarm Cluster
server-02
redis
server-03
redis
Redis Cluster
- 19. CI with Jenkins & Docker
• Environment Prerequisites:
• Gitlab 8.12 (support webhooks)
• Jenkins 2
• Docker Registry 2.0
• Run on Docker
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Data Center Zone
Office Dev Zone
VPN, IP Restriction
local dev server
- 20. 20
1. Developer pushes to Gitlab repo
2. Gitlab webhook
triggers Jenkins
3. Jenkins pull code from Gitlab:
- source code
- Dockerfile
- Jenkinsfile
4. Compile source code
& build Docker image,
auto tag image
5. Push image to
Private Docker Registry
6. Run custom script based on
branch committed
- 21. CI with Jenkins & Docker
• Using Spotify docker-maven-plugin:
• Save space by caching java libraries image layer (~75MB)
• Reduce network traffic & deploy time (only 200-700KB transferred)
• Docker image auto tag:
{git_commit_short_code}-{branch} -> 4b4a71ef-dev
• Custom script based on branch committed:
• dev: trigger another Jenkins Server to update service
• live: manual update
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- 22. Summary
• Docker is great way to package microservices
• Building HA system is easier with Docker Swarm Mode
• CI with Jenkins will reduce delivery time, increase productivity
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- 24. Contact
• Nguyễn Minh Khôi – DKT Technology
• Email: khoinm@dkt.com.vn
• Facebook: https://fb.com/khoinguyen84
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