43. Docker Stack Part 2

## Exaple 3:
-----------
## vi example3.yml

version: "3.8"
services:
web_nginx:
image: nginx
ports:
- "8080:80"
deploy:
mode: replicated
replicas: 4
placement:
constraints:
- "node.role!=manager"
preferences:
- spread: node.labels.datacenter
resources:
limits:
cpus: '0.50'
memory: 50M
reservations:
cpus: '0.25'
memory: 20M
busybox_utility:
image: radial/busyboxplus:curl
command: /bin/sh -c "while true; do sleep 10; done"

## docker stack deploy -c example3.yml app3
## docker stack ls
## docker stack services app3
## docker stack ps app3
## docker stack rm app3

## Example 4:
--------------
## vi example4.yml

version: "3.8"
services:
web_nginx:
image: nginx
ports:
- "8080:80"
deploy:
mode: replicated
replicas: 4
placement:
constraints:
- "node.role!=manager"
preferences:
- spread: node.labels.datacenter
resources:
limits:
cpus: '0.50'
memory: 50M
reservations:
cpus: '0.25'
memory: 20M
volumes:
- type: volume
source: myvolume
target: /data

busybox_utility:
image: radial/busyboxplus:curl
command: /bin/sh -c "while true; do sleep 10; done"

volumes:
myvolume:

## docker stack deploy -c example4.yml app4
## docker volume ls
## docker stack ls
## docker stack ps app4
## docker stack rm app4

## Example 5:
-------------
## vi example5.yml

example5:
vi exampe5.yml

version: "3.8"
services:
web_nginx:
image: nginx
ports:
- "8080:80"
deploy:
mode: replicated
replicas: 4
placement:
constraints:
- "node.role!=manager"
preferences:
- spread: node.labels.datacenter
resources:
limits:
cpus: '0.50'
memory: 50M
reservations:
cpus: '0.25'
memory: 20M
volumes:
- type: volume
source: myvolume
target: /data

busybox_utility:
image: radial/busyboxplus:curl
command: /bin/sh -c "while true; do echo 'HelloDocker'; curl web_nginx:80; sleep 10; done"

volumes:
myvolume:

## docker stack deploy -c example5.yml app5
## docker stack services app5
## docker service logs app5_busybox_utility
## docker stack rm app5