docker官方 入门

链接

1.开始

docker run -d -p 80:80 docker/getting-started
docker ps #查看容器
docker images #查看images
docker inspect 容器#查看容器信息
docker exec -it 容器 /bin/sh #交换进入容器
ps 查看进程
nginx位置 :etc/nginx
nginx配置文件 nginx.conf conf.d/default.conf
docker getting-started 位置： /usr/share/nginx/html/tutorial

2、创建image

• 复制app到usr/share/
• 在app下构建Dockerfile

FROM node:12-alpine
 WORKDIR /app
 COPY . .
 RUN yarn install --production
 CMD ["node", "src/index.js"]

• 构建image

   docker build -t getting-started .
   docker images
   docker ps
   docker stop **
   docker ps
   docker run -dp 3000:3000 getting-started
   curl localhost:3000
   
   
  

3、升级应用

docker ps    #显示正在运行的容器
docker ps -a #显示所有容器
docker rm id #删除容器
docker images #显示镜像
docker rmi id #删除镜像
 docker build -t getting-started . #重新打包镜像
  docker run -dp 3000:3000 getting-started

5 持久化数据(named volume)

 docker run -dp 3000:3000 getting-started
 docker ps
 docker stop id
 docker ps -a
 docker rm -f id
 docker volume create todo-db
 docker run -dp 3000:3000 -v todo-db:/etc/todos getting-started
 docker volume inspect todo-db

6、use bind mounts

#进入app目录
docker run -dp 3000:3000    -w /app -v "$(pwd):/app"       node:12-alpine       sh -c "yarn install && yarn run dev"
docker logs -f <container-id>

7、多容器app 使用mysql

• each container should do one thing and do it well

docker network create todo-app

 docker run -d 
     --network todo-app --network-alias mysql 
     -v todo-mysql-data:/var/lib/mysql 
     -e MYSQL_ROOT_PASSWORD=secret 
     -e MYSQL_DATABASE=todos 
     mysql:5.7
     
 docker volume inspect todo-mysql-data
 docker ps
docker exec -it <mysql-container-id> mysql -p

mysql> SHOW DATABASES;

 docker run -it --network todo-app nicolaka/netshoot
 dig mysql
 
  docker run -dp 3000:3000 
   -w /app -v "$(pwd):/app" 
   --network todo-app 
   -e MYSQL_HOST=mysql 
   -e MYSQL_USER=root 
   -e MYSQL_PASSWORD=secret 
   -e MYSQL_DB=todos 
   node:12-alpine 
   sh -c "yarn install && yarn run dev"
   
   docker logs -f <container-id>
 

8、使用 docker compose

• 安装docker compose

  pip3 install --upgrade pip
  pip3 install docker-compose -i https://pypi.douban.com/simple
  docker-compose --version
  

• 创建compose file

  vim docker-compose.yml
  #-------------
  version: "3.7"
  
  services:
    app:
      image: node:12-alpine
      command: sh -c "yarn install && yarn run dev"
      ports:
        - 3000:3000
      working_dir: /app
      volumes:
        - ./:/app
      environment:
        MYSQL_HOST: mysql
        MYSQL_USER: root
        MYSQL_PASSWORD: secret
        MYSQL_DB: todos
  
    mysql:
      image: mysql:5.7
      volumes:
        - todo-mysql-data:/var/lib/mysql
      environment: 
        MYSQL_ROOT_PASSWORD: secret
        MYSQL_DATABASE: todos
  
  volumes:
    todo-mysql-data:
    
    ####--------
    
  docker-compose up -d
  docker-compose logs -f