centos7中使用docker建立wordpress博客，以及部分踩坑记录

首先前提准备
1.安装docker，这个到菜鸟教程里面就可以搜索到安装教程
2.安装python3环境，因为centos中预装了python2，所以需要下载重新配置下
3.docker安装wordpress的.yml文件

更新 补充：

问题1：docker-compose无法安装，docker-compose version命令不存在

cd /usr/local/bin/

wget https://github.com/docker/compose/releases/download/1.14.0-rc2/docker-compose-Linux-x86_64

rename docker-compose-Linux-x86_64 docker-compose docker-compose-Linux-x86_64

chmod +x /usr/local/bin/docker-compose

参考：https://blog.csdn.net/countofdane/article/details/95206131

问题2：安装docker-compose过程中报错

报错内容
ERROR: Command errored out with exit status 1:
     command: /usr/bin/python2 -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-zItSn5/pycparser/setup.py'"'"'; __file__='"'"'/tmp/pip-install-zItSn5/pycparser/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base pip-egg-info
         cwd: /tmp/pip-install-zItSn5/pycparser/
    Complete output (17 lines):
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/tmp/pip-install-zItSn5/pycparser/setup.py", line 65, in <module>
        cmdclass={'install': install, 'sdist': sdist},
      File "/usr/lib64/python2.7/distutils/core.py", line 112, in setup
        _setup_distribution = dist = klass(attrs)
      File "/usr/lib/python2.7/site-packages/setuptools/dist.py", line 269, in __init__
        _Distribution.__init__(self,attrs)
      File "/usr/lib64/python2.7/distutils/dist.py", line 287, in __init__
        self.finalize_options()
      File "/usr/lib/python2.7/site-packages/setuptools/dist.py", line 302, in finalize_options
        ep.load()(self, ep.name, value)
      File "/usr/lib/python2.7/site-packages/pkg_resources/__init__.py", line 2341, in load
        return self.resolve()
      File "/usr/lib/python2.7/site-packages/pkg_resources/__init__.py", line 2351, in resolve
        raise ImportError(str(exc))
    ImportError: 'module' object has no attribute 'check_specifier'
    ----------------------------------------
ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.

解决方法：

sudo pip install --upgrade pip

sudo pip install --upgrade setuptools

参考：
https://www.cnblogs.com/liubiaos/p/9444485.html
https://blog.csdn.net/liuyunshengsir/article/details/79136379

-----------------------更新分割线--------------------------------------

-----------------------更新分割线--------------------------------------

1.安装docker

在菜鸟教程官网有下载教程，搜索即可https://www.runoob.com/docker/docker-compose.html
或者看我写的一个教程
https://blog.csdn.net/weixin_42245375/article/details/103447571

2.centos7环境下安装python3环境

部分小命令整理：
1.Linux系统下如何查看当前所处目录位置    
	#pwd
2.centos7更新pip版本
	pip install --upgrade pip

2.1 安装

2.1.1 、安装依赖环境

 yum -y install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gdbm-devel db4-devel libpcap-devel xz-devel

2.1.2 安装pip，用pip装wget

yum -y install epel-release

yum install python-pip#安装pip

pip install wget #安装wget

2.1.3 wget下载安装包

sudo mkdir /usr/local/python3 # 创建安装目录

wget --no-check-certificate https://www.python.org/ftp/python/3.7.0/Python-3.7.0.tgz #下载文件

tar -xzvf Python-3.7.0.tgz # 解压

cd Python-3.7.0 #进入

2.1.4 编译安装

sudo ./configure --prefix=/usr/local/python3 # 指定创建的目录

sudo make && sudo make install

2.1.5 建立python3的软链接

sudo ln -s /usr/local/python3/bin/python3 /usr/bin/python3

**备注：**关于建立软链接这部分，我是这个写法，其他博主也有说直接软链接到默认的python的，那样为防止对yum有影响，需要修改yum配置文件，如下

sudo ln -s /usr/local/python3/bin/python3 /usr/bin/python

修改 yum 配置文件
sudo vi /usr/bin/yum
将第一行指定的 python 版本改为 python2.7（#!/usr/bin/python 改为 #!/usr/bin/python2.7）
vi /usr/libexec/urlgrabber-ext-down

2.2 部分坑记录

2.2.1

解决也很简单，但是一开始没想到，我们单独装这个 more-itertools 库，装 5.0.0 版本就好。

pip install more-itertools==5.0.0

再次执行安装最新版本

pip install sentry

3.docker安装wordpress的.yml文件

3.1 docker-compose安装

pip install docker-compose

3.2 最后 docker-compose.yml文件

文件内容：

version: '3.3'

services:
   db:
     image: mysql:5.7
     volumes:
       - db_data:/var/lib/mysql
     restart: always
     environment:
       MYSQL_ROOT_PASSWORD: somewordpress
       MYSQL_DATABASE: wordpress
       MYSQL_USER: wordpress
       MYSQL_PASSWORD: wordpress

   wordpress:
     depends_on:
       - db
     image: wordpress:latest
     ports:
       - "8000:80"
     restart: always
     environment:
       WORDPRESS_DB_HOST: db:3306
       WORDPRESS_DB_USER: wordpress
       WORDPRESS_DB_PASSWORD: wordpress
       WORDPRESS_DB_NAME: wordpress
volumes:
    db_data: {}

进入该文件所在目录，一行命令运行

docker-compose up -d

完成。。

参考：
https://www.cnblogs.com/wushangjue/p/7795969.html
https://blog.csdn.net/qq934235475/article/details/93629697
https://blog.csdn.net/liuyunshengsir/article/details/79136379
https://blog.csdn.net/weixin_42836351/article/details/81297771