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" } }]
3.访问
