持续更新...
前言
近期在 Win10 中装了 WSL(Windows Subsystem for Linux)，由于最近搞 nodejs 时经常用到 mysql，于是试图在 WSL(Ubuntu)中安装 mysql 。下面为大家复现情景 L:
安装 mysql
sudo apt install mysql-server mysql-client
安装完成后尝试启动 MySQL
sudo mysql
接着出现报错
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)
带着问题到 Google 求知若渴的寻找解决方案。
从前辈的经验可得知：在 WSL 中，/var/run/mysqld/mysqld.sock 文件不存在。
于是执行 vim /etc/mysql/my.cnf 查看内容：
#
# The MySQL database server configuration file.
#
# You can copy this to one of:
# - "/etc/mysql/my.cnf" to set global options,
# - "~/.my.cnf" to set user-specific options.
#
# One can use all long options that the program supports.
# Run program with --help to get a list of available options and with
# --print-defaults to see which it would actually understand and use.
#
# For explanations see
# http://dev.mysql.com/doc/mysql/en/server-system-variables.html
#
# * IMPORTANT: Additional settings that can override those from this file!
# The files must end with '.cnf', otherwise they'll be ignored.
#
!includedir /etc/mysql/conf.d/
!includedir /etc/mysql/mysql.conf.d/
根据上述配置在/etc/mysql/mysql.conf.d 目录下的 打开 mysqld.cnf 文件发现
wsl 的 mysqld.cnf 只有*[mysql]*这个内容，缺少了 socket 等配置信息
因此撸起键盘就是哒哒啊，输入内容
bind-address = 127.0.0.1
socket = /var/run/mysqld/mysqld.sock
sock 文件配置成功~~
接着，由于 WSL 的/var/run 下面没有 mysqld 目录，所以执行下述命令新增目录
sudo mkdir -p /var/run/mysqld
sudo chown mysql /var/run/mysqld/
sudo service mysql restart
接着重启 mysql 服务，当以为大功告成时，mysql 再次给了我一个晴天霹雳，shell 上冒出以下错误
- mysql 启动失败：su: warning: cannot change directory to /nonexistent: No such file or directory
这种错误一般是 mysql 服务器异常关机导致的
解决方案如下：
# Ubuntu
sudo service mysql stop
sudo usermod -d /var/lib/mysql/ mysql
sudo service mysql start
# CentOS
sudo systemctl stop mysql.service
sudo usermod -d /var/lib/mysql/ mysql
sudo systemctl start mysql.service
至此，问题基本解决，下面还有 mysql 的安全检测问题，后面在更新吧~~
