一、清理环境
查看是否已安装
rpm -qa |grep -i mysql
rpm -qa |grep -i mariadb –（centos7默认系统自带的查看版本号并进行删除）
rpm -e mariadb-libs-5.5.56-2.el7.x86_64 –删除mariadb
yum remove mariadb-libs-5.5.56-2.el7.x86_64 — 删除mariadb
yum install perl perl-devel //安装依赖包,根据各系统环境而定
二、开始安装
–上传mysql rpm安装包到服务器（安装包可以去oracle官网下载）
rpm -ivh mysql-commercial-common-5.7.28-1.1.el7.x86_64.rpm
rpm -ivh mysql-commercial-libs-5.7.28-1.1.el7.x86_64.rpm
rpm -ivh mysql-commercial-libs-compat-5.7.28-1.1.el7.x86_64.rpm
rpm -ivh mysql-commercial-client-5.7.28-1.1.el7.x86_64.rpm
rpm -ivh mysql-commercial-server-5.7.28-1.1.el7.x86_64.rpm
三、启动&开机自启
systemctl enable mysqld
systemctl start mysqld
systemctl status mysqld
四、获取随机root密码
grep password /var/log/mysqld.log //日志文件查找临时密码
mysql -u root -p
Enter password:
五、修改密码
修改当前登录用户
ALTER USER USER() IDENTIFIED BY ‘Abc123@#$’;
六、用户管理
创建新用户
mysql> use mysql;
_mysql> create user ‘admin’@’%’ identified by ‘Abc123@#$’;
Query OK, 0 rows affected (0.00 sec)
授权
grant select ,insert,update on db1.t1 to “admin”@’%’ identified by “Abc123@#$”;
grant all privileges on db1. to “admin”@’%’ identified by “Abc123@#$”;
grant all privileges on .* to “admin”@’%’ identified by “Abc123@#$”;
_
取消授权
revoke all on db1.t1 from ‘admin’@”%”;
revoke all on db1. from ‘admin’@”%”;
revoke all privileges on .* from ‘admin’@’%’;
3)设置用户 root 可以在任意 IP 下被访问
grant all privileges on . to root@”%” identified by “Abc123@#$”;
七、my.cnf参数配置调整MySQL数据存储目录datadir、socket
systemctl stop mysqld
cp -rp /var/lib/mysql /data –复制数据文件到新的目录
chown -R mysql:mysql /data/mysql
vi /etc/my.cnf
[root@Centos7 tools]# systemctl start mysqld
Job for mysqld.service failed because the control process exited with error code. See “systemctl status mysqld.service” and “journalctl -xe” for details.
[root@Centos7 tools]# /usr/bin/mysql start
ERROR 2002 (HY000): Can’t connect to local MySQL server through socket ‘/data/mysql/mysql.sock’ (2)
调整目录后，MySQL无法启动了，目录权限处理过，还是启动不了
方法一、
临时关闭SELinux：
setenforce 0
永久关闭SELinux：
vi /etc/sysconfig/selinux
然后将配置SELinux=enforcing改为SELinux=disabled
sestatus ##查看SELinux状态
# systemctl start mysqld –关闭SELinux后MySQL可以正常启动
datadir、socket路径修改后因为SELinux安全问题导致无法启动，在网上找了几天也没有人有说清楚，说到需关闭SELinux就已经不错了。
其实真正的问题就是datadir、socket、log修改后的新路径文件夹权限只有MySQL用户和用户组，没有其他的用户，所以受SELinux影响无法写入导致启动失败。
方法二、
ls -ldZ /data/mysql ##查看目录的SElinux 标签
yum provides semanage ###安装
yum -y install policycoreutils-python.x86_64 ###安装
chcon -Rv -u system_u -t mysqld_db_t /data/mysql
semanage fcontext -a -t mysqld_db_t “/data/mysql(/.*)?”
restorecon -Rv /data/mysql
ls -ldZ /data/mysql ##再查看目录的SElinux 标签
# systemctl start mysqld ##处理后，MySQL启动正常
八、防火墙端口 开放
firewall-cmd –zone=public –add-port=3306/tcp –permanent
firewall-cmd –reload
九、通过客户端远程连接测试。OK完成
Original: https://www.cnblogs.com/cny2022/p/16083112.html
Author: CNY2022
Title: CentOS7 安装MySQL5.7企业版（商业版）及修改my.cnf默认datadir、socket路径后无法启动的处理方法
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