实验项目六Docker容器编排

实验环境：

CentOS 7.5

Docker 20.10.2

Docker-Compose 1.25.5

实验步骤：

[root@localhost ~]# cat /etc/redhat-release

CentOS 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: true

Server: 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 8a1c60f6

docker-py version: 4.1.0

CPython version: 3.7.5

OpenSSL 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.yml

version: '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wordpress

volumes:

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 driver

Pulling db (mysql:5.7)…

5.7: Pulling from library/mysql

6ec7b7d162b2: Downloading [======================================> ] 20.64MB/27.1MB

fedd960d3481: Download complete

7ab947313861: Download complete

64f92f19e638: Downloading [=============================================> ] 1.278MB/1.419MB

3e80b17bff96: Download complete

014e976799f9: Waiting

59ae84fee1b3: Waiting

7d1da2a18e2e: Waiting

301a28b700b9: Waiting

529dc8dbeaf3: Waiting

bc9d021dc13f: Waiting

529dc8dbeaf3: Pull complete

bc9d021dc13f: Pull complete

Digest: sha256:c3a567d3e3ad8b05dfce401ed08f0f6bf3f3b64cc17694979d5f2e5d78e10173

Status: Downloaded newer image for mysql:5.7

Pulling wordpress (wordpress:latest)…

latest: Pulling from library/wordpress

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 events

db_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 message

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 message

wordpress_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 operations

wordpress_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 ls

NETWORK ID NAME DRIVER SCOPE

eb2d2ed62e6d bridge bridge local

40a2cdab761b host host local

addc87976b45 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"

}

}

]

运行(记得关闭虚拟机和物理机的防火墙）

原文链接：https://blog.csdn.net/Yo_ol/article/details/121457103?ops_request_misc=%257B%2522request%255Fid%2522%253A%2522168623078216800226541510%2522%252C%2522scm%2522%253A%252220140713.130102334.pc%255Fblog.%2522%257D&request_id=168623078216800226541510&biz_id=0&utm_medium=distribute.pc_search_result.none-task-blog-2~blog~first_rank_ecpm_v1~times_rank-27-121457103-null-null.268%5Ev1%5Ekoosearch&utm_term=docker%E3%80%81wordpress%E3%80%81wordpress%E5%BB%BA%E7%AB%99%E3%80%81wordpress%E4%B8%BB%E9%A2%98%E3%80%81%E5%AE%B9%E5%99%A8%E9%95%9C%E5%83%8F%E3%80%81