docker-compose related

1.1 docker-compose theory

https://www.cnblogs.com/xiaonq/p/10256414.html

1. What is the docker-compose (what)

• Compose is a defining and managing multiple containers tool, written in Python.

• Compose profiles using a plurality of containers described architecture applications, such as what mirroring, data volume, network, port mapping and the like;

• Then a command to manage all services, such as start, stop, restart and so on.

2.docker compose作用(where)

• Now we have to deploy django project that requires django + mysql + redis + nginx, etc.

• We need to open four docker container to deploy each component, if each individual container management too complex, and may be deployed to the client project

  • Each container starts are all saying, such as celery redis will be used, if the first start celery redis does not start to get up services
  • Our django project will use mysql, also use redis, if the two did not start and first start django project, also being given

• Tools multiple docker container is a docker compose can manage a project, a key to start deployment

• A command

  • docker-compose -f xxx.yml

3.docker compose Installation

[root@linux-node4 ~]# curl -L https://github.com/docker/compose/releases/download/1.15.0/docker-compose-`uname -s`-`uname -m` -o /usr/local/bin/docker-compose
[root@linux-node4 ~]# chmod +x /usr/local/bin/docker-compose

4.docker write layer

[root@linux-node1 84c0e08a8cc81e85b2e6a2508bd7a92920129471ec1f5ad1dfe4187c7571e72d]# ll
total 8
drwxr-xr-x 5 root root  39 Mar  4 20:54 diff     # docker容器自己的读写层（只有我们改动的文件在这里）
-rw-r--r-- 1 root root  26 Mar  4 20:54 link
-rw-r--r-- 1 root root 347 Mar  4 20:54 lower
drwxr-xr-x 1 root root  39 Mar  4 20:54 merged   # docker真正的工作区
drwx------ 3 root root  18 Mar  4 20:54 work     # 项目工作路径

1.2 docker-compose applications in the enterprise

1. The pull line codes

$  git clone https://gitee.com/edushiyanlou/django-docker.git

$  docker-compose up -d        # 启动所有容器

$  docker-compose logs celery  # 查看celery运行日志

$  docker-compose down         # 关闭所有容器

启动后访问：http://192.168.56.11

2. Deploy django programs generally use either of those

• django
• mysql
• celery
• repeat
• nginx

1.3 docker-compose the configuration file parsing

version: '3'                       # cocker compose版本号

services:                          # 顶级配置文件(名称自己写)
  mysql:                           # 服务名: 容器建通信、管理容器（mysql这个容器取的名字，也是自己写的）
    image: mysql:5.7               # 引入官方mysql镜像（可以大家自己的hub仓库，中大型公司都会自己搭建docker hub仓库）
    volumes:
      - ./mysql:/var/lib/mysql         # 把当前文件夹下的 ./mysql文件夹挂载到docker容器 /var/lib/mysql 路径下
    expose:
      - "3306"                        # 将当前容器的端口3306端口暴露给link到本容器的容器
    restart: always                   # 宿主机重启自动拉起这个docker容器
    environment:
      - MYSQL_ROOT_PASSWORD=root             # mysql服务器root密码root
      - MYSQL_DATABASE=djangodocker          # 创建数据库 djangodocker
      - MYSQL_USER=django                    # 创建一个用户 django
      - MYSQL_PASSWORD=django                # 用户密码为django


- 单独部署一个nginx
  - 安装nginx服务
  - 配置nginx.conf
  - 配置 /etc/nginx/conf.d/*.conf
  - 访问端口

  nginx:
    image: nginx:alpine
    volumes:
      - ./nginx/nginx.conf:/etc/nginx/nginx.conf
      - ./nginx/conf:/etc/nginx/conf.d
      - ./web/staticfiles:/django_static
    ports:
      - "80:80"                             # 绑定容器的80端口到主机的80端口
    depends_on:
      - web                                 # 必须先启动web容器然才能启动nginx容器

  redis:
    image: redis:alpine
    expose:
      - "6379"
    restart: always

  web:
    build: .
    # command: python manage.py runserver 0:8000
    # ports:
    #   - "8000:8000"
    command: uwsgi --ini uwsgi.ini             # 启动uwsgi命令
    working_dir: /code/web                     # 项目工作路径
    volumes:
      - .:/code                                # 将当前文件夹下所有文件挂载到容器的 /code 文件夹
    expose:
      - "8000"
    depends_on:                                # 必须mysql和reids容器启动后才能启动web容器
      - mysql
      - redis

  celery:
    build: .
    command: celery -A web worker -l info
    working_dir: /code/web
    volumes:
      - .:/code
    depends_on:
      - mysql
      - redis

• Deploy a single nginx
  • Install nginx Service
  • Configuration nginx.conf
  • Configuration /etc/nginx/conf.d/*.conf
  • Access Port