Introduction to Docker Stacks

Create a compose file for the stack.

vi simple-stack.yml

version: '3'
services:
  web:
    image: nginx
  busybox:
    image: radial/busyboxplus:curl
    command: /bin/sh -c "while true; do echo Hello!; sleep 10; done"

Deploy the stack and examine it using various commands.

docker stack deploy -c simple-stack.yml simple
docker stack ls
docker stack ps simple
docker stack services simple
docker service logs simple_busybox

Modify the stack to use an environment variable.

vi simple-stack.yml

version: '3'
services:
  web:
    image: nginx
  busybox:
    image: radial/busyboxplus:curl
    command: /bin/sh -c "while true; do echo $$MESSAGE; sleep 10; done"
    environment:
    - MESSAGE=Hello!

docker stack deploy -c simple-stack.yml simple
docker service logs simple_busybox

Modify the stack to expose a port.

vi simple-stack.yml

version: '3'
services:
  web:
    image: nginx
    ports:
    - "8080:80"
  busybox:
    image: radial/busyboxplus:curl
    command: /bin/sh -c "while true; do echo $$MESSAGE; sleep 10; done"
    environment:
    - MESSAGE=Hello!

docker stack deploy -c simple-stack.yml simple
curl localhost:8080

Modify the stack to use the BusyBox service to communicate with the web service.

vi simple-stack.yml

version: '3'
services:
  web:
    image: nginx
    ports:
    - "8080:80"
  busybox:
    image: radial/busyboxplus:curl
    command: /bin/sh -c "while true; do echo $$MESSAGE; curl web:80; sleep 10; done"
    environment:
    - MESSAGE=Hello!

docker stack deploy -c simple-stack.yml simple

Delete the stack.
```
docker stack rm simple
```

Introduction to Docker Stacks

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