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Docker Swarm (Orchestration Service by docker)
Docker Stack
version: "3"
services:
# Service Name Defined as web
web:
# Pull the Image from Repository.
# replace username/repo:tag with your name and image details
image: anshuldevops/frindly_hello:latest
# Command used to deploy the Service
deploy:
# Run 5 instances of that image as a service called web
replicas: 5
resources:
# Limiting each one to use, at most, 10% of a single core of CPU time and 50MB of RAM.
limits:
cpus: "0.1"
memory: 50M
# Immediately restart containers if one fails.
restart_policy:
condition: on-failure
# Map port 4000 on the host to web’s port 80.
ports:
- "4000:80"
# Define default network
networks:
- webnet
visualizer:
image: dockersamples/visualizer:stable
ports:
- "8080:8080"
volumes:
- "/var/run/docker.sock:/var/run/docker.sock"
deploy:
placement:
constraints: [node.role == manager]
networks:
- webnet
redis:
image: redis
ports:
- "6379:6379"
volumes:
- "./data:/data"
deploy:
placement:
constraints: [node.role == manager]
command: redis-server --appendonly yes #for persistent data volume
networks:
- webnet
networks:
webnet:
Deploying the same multi node application that we deployed before but using docker stack and yaml file
version: "3"
services:
redis:
image: redis:alpine
networks:
- frontend
deploy:
replicas: 1
update_config:
parallelism: 2
delay: 10s
restart_policy:
condition: on-failure
db:
image: postgres:9.4
volumes:
- db-data:/var/lib/postgresql/data
networks:
- backend
deploy:
placement:
constraints: [node.role == manager]
vote:
image: dockersamples/examplevotingapp_vote:before
ports:
- 5000:80
networks:
- frontend
depends_on:
- redis
deploy:
replicas: 2
update_config:
parallelism: 2
restart_policy:
condition: on-failure
result:
image: dockersamples/examplevotingapp_result:before
ports:
- 5001:80
networks:
- backend
depends_on:
- db
deploy:
replicas: 1
update_config:
parallelism: 2
delay: 10s
restart_policy:
condition: on-failure
worker:
image: dockersamples/examplevotingapp_worker
networks:
- frontend
- backend
depends_on:
- db
deploy:
mode: replicated
replicas: 1
labels: [APP=VOTING]
restart_policy:
condition: on-failure
delay: 10s
max_attempts: 3
window: 120s
placement:
constraints: [node.role == manager]
visualizer:
image: dockersamples/visualizer:stable
ports:
- "8080:8080"
stop_grace_period: 1m30s
volumes:
- "/var/run/docker.sock:/var/run/docker.sock"
deploy:
placement:
constraints: [node.role == manager]
networks:
frontend:
backend:
volumes:
db-data:
To deploy the yaml file run,
docker stack deploy -c docker-stack.yml votingstack
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