docker learn :services docker-compose.yml

docker-compose.yml定義了服務的運行參數

version: "3"

services:

web:

# replace username/repo:tag with your name and image details

image: hub.c.163.com/dog948453219/friendlyhello

deploy:

replicas: 8

resources:

limits:

cpus: "0.1"

memory: 50M

restart_policy:

condition: on-failure

ports:

- "4000:80"

networks:

- webnet

networks:

webnet:

~

~

 

 

文件中作的事情有

從hub中拉取鏡像

運行5個web實例，限制每一個使用10%cpu,50mb RAM

若是有失敗的實例當即重啓

映射訪問端口4000到web80端口

訪問時負載均衡

 

 

1.運行web實例

docker swarm init

docker stack deploy -c docker-compose.yml getstartedlab

docker service ls

docker service ps getstartedlab_web

docker container ls -q

 

2.訪問web

curl -4 http://localhost:4000

hostname在變化，也就是負載到不一樣的實例

查看全部的運行container id

docker container ls -q

 

3.從新修改docker-compose.yml中配置實例數，從新發布

docker stack deploy -c docker-compose.yml getstartedlab

 

4.關閉service和swarm

docker stack rm getstartedlab

docker swarm leave --force