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rpm -qa|grep mariadb
rpm -e --nodeps [item]
rm /etc/my.cnf

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cat /etc/group | grep mysql
cat /etc/passwd | grep mysql
# 新增mysql用户组和用户
groupadd mysql
useradd -r -g mysql -s /bin/false mysql

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cd /usr/local/
tar -zxvf mysql-5.7.38-linux-glibc2.12-x86_64.tar.gz
mv mysql-5.7.38-linux-glibc2.12-x86_64 mysql

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cd /usr/local/
chown -R mysql mysql/
chgrp -R mysql mysql/
cd /usr/local/mysql/
mkdir data
chown -R mysql:mysql data

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vi /usr/local/mysql/my.conf

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[mysql]
socket=/var/lib/mysql/mysql.sock
default-character-set=utf8mb4

[mysqld]
socket=/var/lib/mysql/mysql.sock
port = 3306
basedir=/usr/local/mysql
datadir=/usr/local/mysql/data
max_connections=200
character-set-server=utf8mb4
default-storage-engine=INNODB
lower_case_table_names=1
max_allowed_packet=16M
explicit_defaults_for_timestamp=true

[mysql.server]
user=mysql
basedir=/usr/local/mysql

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/usr/local/mysql/bin/mysql_install_db --user=mysql --basedir=/usr/local/mysql/ --datadir=/usr/local/mysql/data/

echo 'export PATH=$PATH:/usr/local/mysql/bin' >> /etc/profile
source /etc/profile

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cp /usr/local/mysql/support-files/mysql.server  /etc/init.d/mysqld
chmod 777 /usr/local/mysql/my.conf
chmod +x /etc/init.d/mysqld
# 启动
/etc/init.d/mysqld restart
# 重启
# /etc/init.d/mysqld restart

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# 获取初始密码
cat ~/.mysql_secret
# 登录
/usr/local/mysql/bin/mysql -uroot -p
# 修改密码
set PASSWORD = PASSWORD('123456');
flush privileges;