docker_stack.txt

# You need a .yaml file with the stack definition:
version: '3'
services:
  fruit:
    image: linuxacademycontent/fruit-service:1.0.1
  vegetables:
    image: linuxacademycontent/vegetable-service:1.0.0
  all_products:
    image: linuxacademycontent/all-products:1.0.0
    ports:
    - "8080:80"
    environment:
    - FRUIT_HOST=fruit
    - FRUIT_PORT=80
    - VEGETABLE_HOST=vegetables
    - VEGETABLE_PORT=80
This stack will contain 3 services (see names 'fruit','vegetables' and 'all_products')
'all_products' will listen on 8080 and also will have 3 environment variables defined
# Now you can deploy the stack:
# where 'produce' will be the stack name
# Now we can check the status of the stack by doing:
docker stack services produce
And we get:
ID                  NAME                   MODE                REPLICAS            IMAGE                                         PORTS
95d3a3g0yjq8        produce_fruit          replicated          1/1                 linuxacademycontent/fruit-service:1.0.1
ikqsmzenjgd0        produce_vegetables     replicated          1/1                 linuxacademycontent/vegetable-service:1.0.0
oyuct2ubwe06        produce_all_products   replicated          1/1                 linuxacademycontent/all-products:1.0.0        *:8080->80/tcp
# Now, set the number of replicas to 3 for the Fruit and Vegetable services in the compose file:
version: '3'
services:
  fruit:
    image: linuxacademycontent/fruit-service:1.0.1
    deploy:
      replicas: 3
  vegetables:
    image: linuxacademycontent/vegetable-service:1.0.0
    deploy:
      replicas: 3
  all_products:
    image: linuxacademycontent/all-products:1.0.0
    ports:
    - "8080:80"
    environment:
    - FRUIT_HOST=fruit
    - FRUIT_PORT=80
    - VEGETABLE_HOST=vegetables
    - VEGETABLE_PORT=80
# Redeploy the stack using the compose file.
docker stack deploy -c produce.yml produce