docker learn :services docker-compose.yml

docker-compose.yml定义了服务的运行参数

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

从hub中拉取镜像

运行5个web实例，限制每一个使用10%cpu,50mb RAM

若是有失败的实例当即重启

映射访问端口4000到web80端口

访问时负载均衡

 

 

1.运行web实例

docker swarm init

docker stack deploy -c docker-compose.yml getstartedlab

docker service ls

docker service ps getstartedlab_web

docker container ls -q

 

2.访问web

curl -4 http://localhost:4000

hostname在变化，也就是负载到不一样的实例

查看全部的运行container id

docker container ls -q

 

3.从新修改docker-compose.yml中配置实例数，从新发布

docker stack deploy -c docker-compose.yml getstartedlab

 

4.关闭service和swarm

docker stack rm getstartedlab

docker swarm leave --force