1. Introduction to Compose

Compose is a tool for defining and running multi-container Docker applications.With Compose, you can configure the services of your application using YAML files.Then, with one command, you can create and start all services from the configuration.

Docker-Compose is a container organization tool.Using a.yml or.yaml file, write the deployment method, file mapping, container port mapping of all containers in one configuration file, and execute the docker-compose up command like a script, install and deploy containers one by one.

Dockerfile allows users to manage a single application container; Compose allows users to define a set of associated application containers in a template (in YAML format), such as a Web service container plus a back-end database service container, as follows:

Docker Compose divides managed containers into three layers:

• project;

• service;

• Containers;

All yml files in the docker compose runtime directory make up a project, a project that contains multiple services, each of which defines the mirror, parameters, and dependencies for container operations.A service can include multiple container instances.

docker-compose is the docker container organization tool, which mainly solves the management of multiple containers that depend on each other.

2. Install Docker

Server is CentOS7.4; Docker version is 19.03.9

1. Install version 19.03.9 Docker

[root@centos01 ~]# cd /etc/yum.repos.d/ 
[root@centos01 yum.repos.d]# wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo      
     <!--download Centos7 source-->
[root@centos01 yum.repos.d]# curl https://download.docker.com/linux/centos/docker-ce.repo -o /etc/yum.repos.d/docker.ce.repo   
       <!--Download the latest version docker source-->
[root@centos01 ~]# yum -y install docker-ce yum-utils device-mapper-persitent-data lvm2   
 <!--install docker and docker-ce Dependent Programs-->
[root@centos01 ~]# Docker version <!--View docker version-->
Client: Docker Engine - Community
 Version:           19.03.9
 API version:       1.40
 Go version:        go1.13.10
 Git commit:        9d988398e7
 Built:             Fri May 15 00:25:27 2020
 OS/Arch:           linux/amd64
 Experimental:      false

Server: Docker Engine - Community
 Engine:
  Version:          19.03.9
  API version:      1.40 (minimum version 1.12)
  Go version:       go1.13.10
  Git commit:       9d988398e7
  Built:            Fri May 15 00:24:05 2020
  OS/Arch:          linux/amd64
[root@centos01 ~]# Systemctl start docker <!--Start docker service-->
[root@centos01 ~]# Systemctl enable docker <!--Set startup autostart-->

2. Configure Mirror Acceleration

Next, enable the download mirror acceleration provided by Dow Cloud (which is also provided by Ali, and I'll write about Dow Cloud here).
Dow Cloud Accelerator URL: https://www.daocloud.io/
The process is as follows:

1) Visit the official website of Dow Yun;

2) Register the user and log in;

After the first two steps are completed, see the picture operation:

When you see the following interface, drag down the page:

Drag here to copy the command according to your system version (copy the following line based on the Linux server):

[root@centos01 ~]# Curl-sSLHttps://get.daocloud.io/daotools/set_Mirror.sh| sh-sHttp://f1361db2.m.daocloud.io<!--Paste the command you just copied-->
docker version >= 1.12
{"registry-mirrors": ["http://f1361db2.m.daocloud.io"]}
Success.
You need to restart docker to take effect: sudo systemctl restart docker
[root@centos01 ~]# Cat/etc/docker/Daemon.json<!--Check to see if acceleration was successfully configured-->
{"registry-mirrors": ["http://f1361db2.m.daocloud.io"]}
[root@centos01 ~]# Systemctl restart docker <!--Restart docker service-->

3. Install and use Docker Compose

1. Github Download Docker Compose

If you want to use compose as a container orchestration tool, you must use the docker-based service, then download the docker-compose command, and we can go Official github website Search for "docker Compose" as follows:

When downloading the compose tool, first check the docker version on your machine!

[root@centos01 ~]# docker -v
Docker version 19.03.9, build 9d988398e7

If the docker version is too low, you can look for other versions of the docker-compose tool yourself.After selecting the appropriate version, execute the commands found on the github website.

[root@centos01 ~]#curl -L https://github.com/docker/compose/releases/download/1.25.4/docker-compose-`uname -s`-`uname -m` -o /usr/local/bin/docker-compose
[root@centos01 ~]#chmod +x /usr/local/bin/docker-compose

2. Docker Compose Download by Dow Cloud

If the download fails due to poor network speed, you can choose one download method: (Personally, I recommend one)

First we visit Dow Cloud Official Website Download it from Dao Yun's official website as follows:

[root@centos01 ~]# curl -L https://get.daocloud.io/docker/compose/releases/download/1.25.5/docker-compose-`uname -s`-`uname -m` > /usr/local/bin/docker-compose  
          <!--Paste the command you just copied to download Docker Compose-->
[root@centos01 ~]# Docker-compose-v <!--View Docker Compose Version-->
docker-compose version 1.25.5, build 8a1c60f6

You can customize the version you want by modifying the version in the URL.After executing the above two commands, we can use the docker-compose orchestration tool.

IV. Writing.yml Files

1..yml file to build simple Nginx services

[root@centos01 ~]# vim /root/.vimrc
set tabstop=2
[root@centos01 ~]# source /root/.vimrc
<!--Because tab The key is used more, so one is set up beforehand tab Key represents two spaces-->
[root@centos01 ~]# mkdir docker_compose 
        <!--Create a test directory to store docker-compose.yml file-->
[root@centos01 ~]# CD docker_Compose/ <!--Enter the directory you just saw-->
<!--Suggest only one directory docker-compose.yml file-->
[root@centos01 docker_compose]# vim docker-compose.yml   
    <!--Write a docker-compose.yml file-->
version: "3"                           <!--compose Version of-->
services:                              <!--Define Services-->
  nginx:
    container_name: nginx           <!--Running Container Name-->
    image: nginx:latest                                  <!--Mirror used-->
    restart: always                                <!--along with docker Start with service-->
    ports:
      - 80:80                                         <!--Mapped Port-->
    volumes:
      - /root/compose_test/webserver:/usr/share/nginx/html          
           <!--Directories mounted locally and containers-->
<!--Write a file with indentation in mind-->      
[root@centos01 docker_compose]# docker-compose up -d
<!--Use the current directory docker-compose.yml File Generation Corresponding Container-->
<!--"-d"Option to run in the background, if not specified, run in the foreground by default, which occupies the terminal-->
[root@centos01 docker_compose]# Docker PS <!--View running containers-->
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                NAMES
a4d71936dd12        nginx:latest        "nginx -g 'daemon of..."   46 seconds ago      Up 45 seconds       0.0.0.0:80->80/tcp   nginx
[root@centos01 docker_compose]# echo "www.docker-compose.com" > webserver/index.html
       <!--Create Test Page-->
[root@centos01 docker_compose]# CurlHttp://192.168.100.10<!--Access Test-->
www.docker-compose.com
[root@centos01 docker_compose]# Docker-compose stop <!--Stops the container specified in the file through the.yml file-->
Stopping nginx ... done
[root@centos01 docker_compose]# Docker PS <!--Check to see if the container stops-->
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
[root@centos01 ~]# docker-compose -f docker_compose/docker-compose.yml up -d
<!--You can use "-f"Options to specify yml Container defined in file startup file-->

2. Compoose+dockerfile to build a mirror

[root@centos01 ~]# MKDIR compose & & CD compose <!--Create a test directory and enter -->
[root@centos01 compose]# VIM Dockerfile <!--Create dockerfile-->
FROM nginx:latest          <!--base image-->
ADD html /usr/share/nginx/html 
[root@centos01 compose]# VIM docker-Compose.yml<!--Write YML file-->
version: '3'
services:
  nginx:
    build: .              <!--Specify here dockerfile Path, you can write relative or absolute paths--> 
    container_name: nginx001   <!--Generated container name-->
    image: nginx001           <!--Use dockerfile Generated Mirror Name-->
    restart: always           <!--along with docker Start with service-->
    ports:
      - 8080:80             <!--Mapped Port-->
[root@centos01 compose]# MKDIR HTML <!--Create site root directory-->
[root@centos01 compose]# Echo "Www.nginx.8080.com"> html/Index.html<!--Write home page test content-->
[root@centos01 compose]# Docker-compose up-d <!--Generate container-->
[root@centos01 compose]# Docker PS <!--View container-->
CONTAINER ID        IMAGE               COMMAND                  CREATED              STATUS              PORTS                  NAMES
1428cd1ab7de        nginx001            "nginx -g 'daemon of..."   About a minute ago   Up About a minute   0.0.0.0:8080->80/tcp   nginx001
a4d71936dd12        nginx:latest        "nginx -g 'daemon of..."   18 minutes ago       Up 15 minutes       0.0.0.0:80->80/tcp     nginx
[root@centos01 compose]# Docker images <!--View mirror-->
REPOSITORY          TAG                 IMAGE ID            CREATED              SIZE
nginx001            latest              55b8bd0a4a59        About a minute ago   127MB
nginx               latest              9beeba249f3e        5 days ago           127MB
[root@centos01 compose]# CurlHttp://192.168.100.10: 8080 <!--Access Test-->
www.nginx.8080.com
[root@centos01 compose]# Docker-compose stop <!--Stop container-->
Stopping nginx001 ... done
[root@centos01 ~]# docker-compose -f compose/docker-compose.yml up -d     
            <!--adopt-f Appoint.yml File to run container-->
Starting nginx001 ... done 

3. Use.yml file to build blog platform

[root@centos01 ~]# MKDIR WordPress && CD WordPress <!--Create test directory-->
[root@centos01 wordpress]# VIM docker-Compose.yml<!--Write YML file-->
version: '3.1' 
services:
  wordpress:
    image: wordpress           <!--Specify the mirror to use-->
    restart: always
    ports:
      - 1111:80        <!--Specify mapped ports-->
    environment:             <!--Modify environment variables inside containers-->
      WORDPRESS_DB_HOST: mysql
      WORDPRESS_DB_USER: wordpress
      WORDPRESS_DB_PASSWORD: pwd@123
      WORDPRESS_DB_NAME: wordpress
  mysql:
    image: mysql:5.6
    restart: always
    command: --character-set-server=utf8   <!--Support Chinese-->
    environment:
      MYSQL_ROOT_PASSWORD: pwd@123  <!--root Access database password-->
      MYSQL_DATABASE: wordpress         <!--Establish wordpress data base-->
      MYSQL_USER: wordpress            <!--User Name-->
      MYSQL_PASSWORD: pwd@123         <!--User Access Password-->
[root@centos01 wordpress]# Docker-compose up-d <!--Generate the appropriate container and run in the background-->
[root@centos01 wordpress]# Docker PS <!--View running containers-->
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                  NAMES
a93858ade399        wordpress           "docker-entrypoint.s..."   28 seconds ago      Up 27 seconds       0.0.0.0:1111->80/tcp   wordpress_wordpress_1
cec94e3bd0ee        mysql:5.6           "docker-entrypoint.s..."   28 seconds ago      Up 27 seconds       3306/tcp               wordpress_mysql_1
[root@centos01 wordpress]# Docker images <!--View mirror-->
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
mysql               5.6                 9e4a20b3bbbc        10 hours ago        302MB
wordpress           latest              675af3ca3193        5 days ago          540MB
[root@centos01 wordpress]# Netstat-anptu | grep 1111 <!--Make sure port 1111 is listening-->
tcp6       0      0 :::1111                 :::*                    LISTEN      119795/docker-proxy
[root@centos01 wordpress]# echo "net.ipv4.ip_forward = 1" >> /etc/sysctl.conf  
            <!--Turn on Routing-->
[root@centos01 wordpress]# Sysctl-p <!--Refresh Configuration-->
net.ipv4.ip_forward = 1

Client AccessHttp://192.168.100.10: 1111

Set up basic information:

Installation complete, login:

Enter username password:

Modify the font to Simplified Chinese:

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