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"Deploying Multi-OS Applications with Docker Swarm" with Docker's David Yu
- 1. Vegas Meetup - Deploying Multi- OS Applications with Docker Swarm David Yu - david.yu@docker.com Before we get started you will need: ● RDP client ● SSH client
- 2. • Build a swarm cluster − Linux manager − Windows worker • Deploy a OS-specific tweet web app to both nodes • Deploy a simple two service app − Java-based web front end running on Linux − SQL server based database on Windows Clustering and container scheduling 2 What will we be doing today?
- 3. Build the Swarm Cluster
- 4. Node Node Node Node Node Node Swarm Topology Node Node Node Node Node Node Manager Worker ● Each Node has a role ● Roles are dynamic ● Programmable Topology
- 5. Swarm Manager Swarm Manager Swarm Topology: High Availability Swarm Manager Swarm Worker Swarm Worker Swarm Worker Swarm Worker Swarm Worker Swarm Worker Leader FollowerFollower
- 6. Swarm Manager Swarm Manager Swarm Topology: High Availability Swarm Manager Swarm Worker Swarm Worker Swarm Worker Swarm Worker Swarm Worker Swarm Worker Leader FollowerFollower
- 7. Swarm Manager Swarm Manager Swarm Topology: High Availability Swarm Manager Swarm Worker Swarm Worker Swarm Worker Swarm Worker Swarm Worker Swarm Worker Follower FollowerLeader
- 8. Swarm Manager Swarm Manager Swarm Topology: High Availability Swarm Manager Swarm Worker Swarm Worker Swarm Worker Swarm Worker Swarm Worker Swarm Worker Follower FollowerLeader
- 9. 9 Configuring RDP Client WiFi Info: vz-guest User: vz9933 PN: 58432 Before we get started you will need: • RDP client • SSH client Lab Guide: https://github.com/mikegcoleman/hybrid-workshop
- 11. Services Tasks • Services provide a piece of functionality • Based on a Docker image • An application is made up of 1-n services • Replicated Services and Global Services • Tasks are the containers that actually do the work • A service has 1-n tasks
- 12. How service deployment works $ docker service create declares the service name, network, image:tag and scale Managers break down service into tasks, schedules them and workers execute tasks Engines check to see what is running and compared to what was declared to “true up” the environment Declare ScheduleReconcile
- 13. Engine Engine Engine Engine Engine Engine Services $ docker service create --replicas 3 --name frontend --network mynet --publish 80:80/tcp frontend_image:latest mynet
- 14. Engine Engine Engine Engine Engine Engine Services $ docker service create --replicas 3 --name frontend --network mynet --publish 80:80/tcp frontend_image:latest $ docker service create --name redis --network mynet redis:latest mynet
- 15. Engine Engine Engine Engine Engine Engine Node Failure $ docker service create --replicas 3 --name frontend --network mynet --publish 80:80/tcp frontend_image:latest $ docker service create --name redis --network mynet redis:latest mynet
- 16. Engine Engine Engine Engine Engine Desired State ≠ Actual State $ docker service create --replicas 3 --name frontend --network mynet --publish 80:80/tcp frontend_image:latest $ docker service create --name redis --network mynet redis:latest mynet
- 17. Engine Engine Engine Engine Engine Converge Back to Desired State $ docker service create --replicas 3 --name frontend --network mynet --publish 80:80/tcp frontend_image:latest $ docker service create --name redis --network mynet redis:latest mynet
- 18. Labels • Docker uses labels to manage metadata on objects • Many objects already have labels / metadata • Docker allows arbitrary assignment of labels • Filter on labels: docker ps --filter "label=color" • Schedule based on labels (--constraint)
- 20. Docker Compose: Multi Container Applications 20 Without Compose • Build and run one container at a time • Manually connect containers together • Must be careful with dependencies and start up order With Compose • Define multi container app in compose.yml file • Single command to deploy entire app • Handles container dependencies • Works with Docker Swarm, Networking, Volumes, Universal Control Plane
- 21. containers: web: build: . command: python app.py ports: - "5000:5000" volumes: - .:/code environment: - PYTHONUNBUFFERED=1 redis: image: redis:latest command: redis-server --appendonly yes Docker Compose: Multi Container Applications
- 22. Stacks: Multi-Container Applications ●A stack is a collection of related services ○ Requires Swarm ●Stacks are a Docker primitive ○ docker stack deploy ○ docker stack ps ○ docker stack rm ●Implemented via a docker compose file 22
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