docker compose 的安装和入门实战

compose说明 

• 原生docker命令操作容器比较麻烦 
• compose可以把操作容器的命令写入到配置文件中，让我们更方便的操作容器

compose的安装 

yum install epel-release -y
yum install python-pip -y
cd /usr/local/src
wget https://github.com/docker/compose/releases/download/1.26.2/docker-compose-Linux-x86_64
mv docker-compose-Linux-x86_64 /usr/bin/docker-compose
chmod 755 /usr/bin/docker-compose
docker-compose version

或者通过升级python的方式

升级 Python

方法有很多，能正常升级就可以

1. 通过 yum 下载最新 python

yum install -y epel-release
yum install -y python36

ls -l /usr/bin/python*

rm -f /usr/bin/python 

ln -s /usr/bin/python3.6 /usr/bin/python

sed -i '1d' /usr/bin/yum
sed -i '1i#!/usr/bin/python2.7' /usr/bin/yum
sed -i '1d' /usr/libexec/urlgrabber-ext-down
sed -i '1i#!/usr/bin/python2.7' /usr/libexec/urlgrabber-ext-down

python -V

安装 docker-compose

1. 安装

curl -L "https://github.com/docker/compose/releases/download/1.25.3/docker-compose-$(uname -s)-$(uname -m)" 
-o  /usr/local/bin/docker-compose

chmod +x /usr/local/bin/docker-compose

2. 测试

docker-compose version

compose配置文件：/docker/compose/redis/docker-compose.yml 

version: '2' 
services: 
redis: 
image: centos7:redis

compose操作容器，cd进入到docker-compose.yml 所在的目录

• 后台启动容器：docker-compose up -d 
• 查看容器：docker-compose ps 
• 停止并删除容器：docker-compose down
  
• 停止并删除容器并且删除所使用的volumes：docker-compose down -v
• 停止启动容器：docker-compose stop; docker-compose start

docker-compose exec的使用 

docker-compose exec nginx bash

compose管理多个容器docker-compose.yml 

version: '2' 
services: 
  redis: 
    image: centos7:redis 
  nginx: 
    image: centos7:nginx

compose使用端口映射 

version: '2' 
services: 
  redis: 
    image: centos7:redis 
    ports: 
      - "6379:6379" 
  nginx: 
    image: centos7:nginx 
    ports: 
      - "8080:80" 
      - "9090:80"

compose设置网络模式 

version: '2' 
services: 
  redis: 
    image: centos7:redis 
  nginx: 
    image: centos7:nginx 
    network_mode: "host"

compose设置文件共享 

version: '2'
services: 
  nginx: 
    image: centos7:nginx 
    network_mode: "host" 
    volumes: 
      - /centos7/logs:/usr/local/nginx/logs 
      - /centos7/apps:/usr/local/nginx/html/apps

进入到docker-compose.yml所在的目录，compose同个镜像启动多个容器 

cd /docker/compose/redis/
docker-compose up -d --scale redis=3 
docker-compose exec --index=2 redis bash