Docker and CloudStack
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- Docker can be integrated with CloudStack in several ways, including running Docker in CloudStack virtual machine guests, packaging CloudStack as Docker containers, and using Docker orchestrators to manage containers. - CloudStack could potentially be re-architected to run its components in Docker containers and use Docker networking for isolation, with an orchestrator like Mesos or Kubernetes managing the CloudStack application. - There are open questions around whether CloudStack or other orchestrators should schedule virtual machines or containers as the primary compute resource in a private cloud data center.
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Docker and CloudStack
- 1. And cloudStack Sebastien Goasguen Seattle, August 20th @sebgoa
- 2. Background • Citrix Open Source Architect • VP of Apache CloudStack • PMC of Apache libcloud • ASF member • O’Reilly author of the Docker cookbook
- 3. Stop the press •Docker is super cool •It’s changing the way we design and manage applications •It may change the way we build infrastructure systems
- 4. • Docker engine • Docker compose • Docker machine • Docker Swarm • Docker Toolbox • Docker Network
- 5. • A VM orchestrator • Same as Opennebula/OpenStack/Eucalyptus • Made to build a public or private cloud • Hypervisor agnostic • Multi-tenancy • Network and Storage plugins • API
- 6. Integration points • Docker in CloudStack guests • Package CloudStack as a set of containers • Docker orchestrators • Docker as plumbing
- 7. Docker in cloudstack VM
- 8. Where do you run Docker ?
- 9. • On VMs • In a Public cloud • Guests with Docker engine • “Docker templates”
- 10. Offer those in your cloud
- 11. Machine • One binary to create a remote Docker host and setup the TLS communication with your local docker client. • Automates the TLS setup and the configuration of the local environment • Can manage multiple machines in different clouds at the same time
- 12. CloudStack and Machine • Many drivers (i.e exoscale ) • Generic CloudStack driver needs love $ ./docker-machine create -d exoscale foobar INFO[0000] Creating SSH key... INFO[0001] Creating exoscale... INFO[0005] Waiting for SSH... INFO[0072] Configuring Machine...
- 13. Cloudstack in docker containers
- 14. CloudStack installation • Docker is great to package distributed applications • Why not package CloudStack in Docker. • Running CloudStack would be just about running a few containers.
- 15. Docker to Package CloudStack cloudstack/simulator cloudstack/management_centos6 cloudstack/cloudmonkey cloudstack/marvin cloudstack/ec2stack
- 16. Dockerfiles • All CloudStack repositories now have Dockerfiles • Automated builds setup on Jenkins and Docker hub • Need to work on bootstrap process • Decoupling DB • …
- 17. Docker Compose • One binary to start/manage multiple containers and volumes on a single Docker host • Move your lengthy docker run commands to a YAML file
- 18. e.G YAML description wordpress: image: wordpress links: - mysql ports: - "80:80" environment: - WORDPRESS_DB_NAME=wordpress - WORDPRESS_DB_USER=wordpress - WORDPRESS_DB_PASSWORD=wordpresspwd mysql: image: mysql volumes: - /home/docker/mysql:/var/lib/mysql environment: - MYSQL_ROOT_PASSWORD=wordpressdocker - MYSQL_DATABASE=wordpress - MYSQL_USER=wordpress - MYSQL_PASSWORD=wordpresspwd
- 19. CloudStack ? cloudstack: image: cloudstack/management links: - mysql ports: - "8080:8080” mysql: image: mysql volumes: - /home/docker/mysql:/var/lib/mysql … ec2: image: cloudstack/ec2stack ports: - “5000:5000”
- 20. The Agent • In the case of KVM, we need to run a KVM agent • Need to run the agent in a container, and use it to spawn KVM processes in the host • Easy integration with CloudStack, there are more involved scenarios.
- 22. Docker orchestrators • How to manage docker containers on multi- host ? • Docker swarm, Lattice, kubernetes, Rancher • Should CloudStack orchestrates containers ?
- 23. How about Swarm ? • You can create a swarm cluster with docker- machine • Hence, it’s easy to create a Swarm in CloudStack
- 24. How to deploy apps in clouds • Configuration mgt • Terraform • Recipes to deploy Kubernetes, Rancher and Lattice • Terraform plans to deploy Lattice and Kubernetes on CloudStack
- 25. Philosophy • CloudStack manages VM • Let’s do it well • Let something else manage containers • Can’t keep up with the velocity of Kubernetes • If AWS builds ECS on top of EC2 why should we do it differently
- 26. Docker plumbing
- 27. Not only containers • Docker is also becoming a great tool for plumbing infra • Docker network – Allows you to create VXLAN overlays – Plugins, including OVS plugin • Use Docker network as a new network provider in cloudstack
- 28. Letting loose a bit …
- 29. What if ? • CloudStack is a distributed app • CloudStack components all run in containers • We use docker network to isolate users’s VM • Why not run the VMs in containers as well (i.e KVM process in a namespace and cgroups) • What manages CloudStack then ? A container application
- 30. Rancher on Mesos
- 31. CloudStack 5.0 • CloudStack as a Mesos framework is totally doable (e.g KVM executor ) • Kubernetes has the same lineage as Mesos (i.e Borg) • How about CloudStack in Kubernetes ? – Why not. GCE is a Kubernetes app
- 32. What gives ? • Docker on cloudstack ? • Cloudstack on docker ? • Boils down to the unit of scheduling in your data center • Do you prefer to schedule VMs or containers ?
- 33. Conclusions • Docker is super cool • We already have integration points in CloudStack • Room for more and room for your help • What the future is made of…we will see soon enough !