* Commands
https://www.jianshu.com/p/1dab9a4d0d5f
** Install 
*** Download Package: 
wget https://dev.mysql.com/get/mysql57-community-release-el7-11.noarch.rpm
yum localinstall mysql57-community-release-el7-11.noarch.rpm
*** Install 
yum install -y mysql-community-server
** Start
systemctl start mysqld

# Check Status
systemctl status mysqld

# 设置开机启动
shell> systemctl enable mysqld
# 重载所有修改过的配置文件
shell> systemctl daemon-reload
** Password
*** Get the init password when installing:
grep 'temporary password' /var/log/mysqld.log
mysql -uroot -p  # Input password then
ALTER USER 'root'@'localhost' IDENTIFIED BY 'MyNewPass4!'; 

*** Update later:
mysql> use mysql;
mysql> update user set password=PASSWORD('MyNewPass5!') where user='root';
mysql> flush privileges;
** Restart
systemctl restart mysqld
** 默认配置文件路径：
配置文件：/etc/my.cnf
日志文件：/var/log/mysqld.log
服务启动脚本：/usr/lib/systemd/system/mysqld.service
socket文件：/var/run/mysqld/mysqld.pid