环境：

CentOS 7.5

Docker 20.10.2

Docker-Compose 1.25.5

[root@localhost ~]# cat /etc/redhat-releaseCentOS Linux release 7.5.1804 (Core)[root@localhost ~]# docker version            # Docker版本Client: Docker Engine - Community Version:           20.10.2 API version:       1.41 Go version:        go1.13.15 Git commit:        2291f61 Built:             Mon Dec 28 16:17:48 2020 OS/Arch:           linux/amd64 Context:           default Experimental:      trueServer: Docker Engine - Community Engine:  Version:          20.10.2  API version:      1.41 (minimum version 1.12)  Go version:       go1.13.15  Git commit:       8891c58  Built:            Mon Dec 28 16:16:13 2020  OS/Arch:          linux/amd64  Experimental:     false containerd:  Version:          1.4.3  GitCommit:        269548fa27e0089a8b8278fc4fc781d7f65a939b runc:  Version:          1.0.0-rc92  GitCommit:        ff819c7e9184c13b7c2607fe6c30ae19403a7aff docker-init:  Version:          0.19.0  GitCommit:        de40ad0[root@localhost ~]# docker-compose version       # Docker-compose版本docker-compose version 1.25.5, build 8a1c60f6docker-py version: 4.1.0CPython version: 3.7.5OpenSSL version: OpenSSL 1.1.0l  10 Sep 2019

参考： Docker-Compose官方搭建Wordpress教程：https://docs.docker.com/compose/wordpress/

1.下载项目(docker-compose.yml)

[root@localhost ~]# cd /home/[root@localhost home]# mkdir my_wordpress[root@localhost home]# cd my_wordpress/[root@localhost my_wordpress]# vim docker-compose.ymlversion: '3.3'           #compose文件版本services:   db:                   # 服务1：db     image: mysql:5.7    # 使用镜像 mysql：5.7版本     volumes:       - db_data:/var/lib/mysql   # 数据持久化     restart: always     # 容器服务宕机后总是重启     environment:        # 环境配置       MYSQL_ROOT_PASSWORD: somewordpress       MYSQL_DATABASE: wordpress       MYSQL_USER: wordpress       MYSQL_PASSWORD: wordpress   wordpress:          # 服务2：wordpress     depends_on:       # wordpress服务启动时依赖db服务，所以会自动先启动db服务       - db     image: wordpress:latest    # 使用镜像 wordpress：latest最新版     ports:       - "8000:80"          #端口映射8000:80     restart: always     environment:        # 环境       WORDPRESS_DB_HOST: db:3306     # wordpress连接db的3306端口       WORDPRESS_DB_USER: wordpress    # wordpress的数据库用户为wordpress       WORDPRESS_DB_PASSWORD: wordpress   # wordpress的数据库密码是wordpress       WORDPRESS_DB_NAME: wordpress    # wordpress的数据库名字是wordpressvolumes:    db_data: {}

说明：

可以看到上面的docker-compose.yml文件中第一行为version:'3.3'，这个是compose文件的版本，它是与docker引擎的版本相对应的，并且向下兼容。

2.启动项目

注意：大部分的compose命令都需要到docker-compose.yml文件所在的目录下才能执行。

前台启动项目: docker-compose up

后台执行该服务可以加上 -d 参数： docker-compose up -d

指定yml文件启动：docker-compose -f 【yml文件绝对路径】 up / -d

[root@localhost my_wordpress]# docker-compose up  -d  # 后台运行项目Creating network "my_wordpress_default" with the default driver     -----》# 为wordpress项目创建my_wordpress_default网络Creating volume "my_wordpress_db_data" with default driverPulling db (mysql:5.7)...5.7: Pulling from library/mysql6ec7b7d162b2: Downloading [======================================>            ]  20.64MB/27.1MBfedd960d3481: Download complete7ab947313861: Download complete64f92f19e638: Downloading [=============================================>     ]  1.278MB/1.419MB3e80b17bff96: Download complete014e976799f9: Waiting59ae84fee1b3: Waiting7d1da2a18e2e: Waiting301a28b700b9: Waiting529dc8dbeaf3: Waitingbc9d021dc13f: Waiting529dc8dbeaf3: Pull completebc9d021dc13f: Pull completeDigest: sha256:c3a567d3e3ad8b05dfce401ed08f0f6bf3f3b64cc17694979d5f2e5d78e10173Status: Downloaded newer image for mysql:5.7Pulling wordpress (wordpress:latest)...latest: Pulling from library/wordpress6ec7b7d162b2: Already existsdb606474d60c: Pull completeafb30f0cd8e0: Pull complete3bb2e8051594: Pull complete4c761b44e2cc: Pull completec2199db96575: Pull complete1b9a9381eea8: Pull complete50f0689715a3: Pull complete8a6cc018dd45: Pull complete052299cf2d76: Pull completeee83da709c88: Pull complete5b10df91e6d0: Pull completea2eb858e27d8: Pull completee6269830d5ad: Pull complete228a0fa8a95f: Pull complete91f7abe86332: Pull complete5c3d3e1e4145: Pull completee75d27a32f14: Pull complete3c632295f58e: Pull complete84352e306791: Pull completeDigest: sha256:e3a851040e7eef9c2b6dd954bfcf08b5a9847b2efbc252d4ccb1b0864225d9fcStatus: Downloaded newer image for wordpress:latestCreating my_wordpress_db_1 ... doneCreating my_wordpress_wordpress_1 ... doneAttaching to my_wordpress_db_1, my_wordpress_wordpress_1db_1         | 2021-01-09 03:56:06+00:00 [Note] [Entrypoint]: Entrypoint script for MySQL Server 5.7.32-1debian10 started.db_1         | 2021-01-09 03:56:06+00:00 [Note] [Entrypoint]: Switching to dedicated user 'mysql'db_1         | 2021-01-09 03:56:06+00:00 [Note] [Entrypoint]: Entrypoint script for MySQL Server 5.7.32-1debian10 started.db_1         | 2021-01-09 03:56:06+00:00 [Note] [Entrypoint]: Initializing database filesdb_1         | 2021-01-09T03:56:06.498622Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).db_1         | 2021-01-09T03:56:06.956978Z 0 [Warning] InnoDB: New log files created, LSN=45790db_1         | 2021-01-09T03:56:06.992692Z 0 [Warning] InnoDB: Creating foreign key constraint system tables.db_1         | 2021-01-09T03:56:07.053810Z 0 [Warning] No existing UUID has been found, so we assume that this is the first time that this server has been started. Generating a new UUID: 99ff1af4-522e-11eb-a33c-0242ac130002.db_1         | 2021-01-09T03:56:07.054442Z 0 [Warning] Gtid table is not ready to be used. Table 'mysql.gtid_executed' cannot be opened.wordpress_1  | WordPress not found in /var/www/html - copying now...wordpress_1  | Complete! WordPress has been successfully copied to /var/www/htmldb_1         | 2021-01-09T03:56:07.578842Z 0 [Warning] CA certificate ca.pem is self signed.wordpress_1  | [09-Jan-2021 03:56:07 UTC] PHP Warning:  mysqli::__construct(): (HY000/2002): Connection refused in Standard input code on line 22...db_1         | 2021-01-09T03:56:16.546749Z 0 [Note] Skipping generation of SSL certificates as certificate files are present in data directory.db_1         | 2021-01-09T03:56:16.547255Z 0 [Warning] CA certificate ca.pem is self signed.db_1         | 2021-01-09T03:56:16.547310Z 0 [Note] Skipping generation of RSA key pair as key files are present in data directory.db_1         | 2021-01-09T03:56:16.547780Z 0 [Note] Server hostname (bind-address): '*'; port: 3306db_1         | 2021-01-09T03:56:16.547866Z 0 [Note] IPv6 is available.db_1         | 2021-01-09T03:56:16.547878Z 0 [Note]   - '::' resolves to '::';db_1         | 2021-01-09T03:56:16.547892Z 0 [Note] Server socket created on IP: '::'.db_1         | 2021-01-09T03:56:16.548648Z 0 [Warning] Insecure configuration for --pid-file: Location '/var/run/mysqld' in the path is accessible to all OS users. Consider choosing a different directory.db_1         | 2021-01-09T03:56:16.555145Z 0 [Note] Event Scheduler: Loaded 0 eventsdb_1         | 2021-01-09T03:56:16.555312Z 0 [Note] mysqld: ready for connections.db_1         | Version: '5.7.32'  socket: '/var/run/mysqld/mysqld.sock'  port: 3306  MySQL Community Server (GPL)wordpress_1  | AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 172.19.0.3. Set the 'ServerName' directive globally to suppress this messagewordpress_1  | AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 172.19.0.3. Set the 'ServerName' directive globally to suppress this messagewordpress_1  | [Sat Jan 09 03:56:16.984658 2021] [mpm_prefork:notice] [pid 1] AH00163: Apache/2.4.38 (Debian) PHP/7.4.14 configured -- resuming normal operationswordpress_1  | [Sat Jan 09 03:56:16.984711 2021] [core:notice] [pid 1] AH00094: Command line: 'apache2 -D FOREGROUND'

`Docker网络(重要)`

可以看到在使用docker-compose管理项目的时候，docker-compose会自动给我们创建一个项目网络，这是docker-compose的网络默认规则，创建的项目网络可以方便我们管理维护项目，同一个项目的所有服务可以直接互相通过服务名访问！！！

这样的一个好处是：开发不需要在配置中写死某个服务的IP地址，只需要写服务名即可，当该服务异常挂掉，同一个服务重启后IP可能会不同，如果写死的话就得去更改，很麻烦。所以这就是docker-compose默认创建网络提供的便利性。

[root@localhost ~]# docker network lsNETWORK ID     NAME                   DRIVER    SCOPEeb2d2ed62e6d   bridge                 bridge    local40a2cdab761b   host                   host      localaddc87976b45   my_wordpress_default   bridge    local       #项目网络446393a43e7b   none                   null      local[root@localhost ~]# docker network inspect my_wordpress_default    #查看项目网络详情[    {        "Name": "my_wordpress_default",        "Id": "addc87976b4535cdb24c84a00afc9744b5951a520e7230bc8ef76189ea06bf05",        "Created": "2021-01-09T11:55:20.242710185+08:00",        "Scope": "local",        "Driver": "bridge",        "EnableIPv6": false,        "IPAM": {            "Driver": "default",            "Options": null,            "Config": [                {                    "Subnet": "172.19.0.0/16",                    "Gateway": "172.19.0.1"                }            ]        },        "Internal": false,        "Attachable": true,        "Ingress": false,        "ConfigFrom": {            "Network": ""        },        "ConfigOnly": false,        "Containers": {            "c95da3fa0f6c42a564d99b35f70e5c51c5a1163ab53b9a6ae305f98d6b2b6f9f": {                "Name": "my_wordpress_db_1",                "EndpointID": "e1a66aec2e36fb74d0d75af69ff6c74c20c06508bfe2d8c34384d45062007c25",                "MacAddress": "02:42:ac:13:00:02",                "IPv4Address": "172.19.0.2/16",                "IPv6Address": ""            },            "cccd067d18e46beb27a345721148569464ad618c1cfd99357fe4b80d75e7ff27": {                "Name": "my_wordpress_wordpress_1",                "EndpointID": "f238817ce5358d7b57a1668ea9ddda40c88a227c2c1d762fa553e38fd22d7e2b",                "MacAddress": "02:42:ac:13:00:03",                "IPv4Address": "172.19.0.3/16",                "IPv6Address": ""            }        },        "Options": {},        "Labels": {            "com.docker.compose.network": "default",            "com.docker.compose.project": "my_wordpress",            "com.docker.compose.version": "1.25.5"        }    }]