centos7安装数据库步骤

首先两种安装方式，第一种通过yum源安装mariadb;第二种通过安装mysql；

• yum -y install mysql
• yum -y install mariadb-server
• mysql_secure_installation 设置 root密码等相关

当出现ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)

把这个/var/lib/mysql路径下清空；

systemctl start mysqld.service

systemctl status mysqld.service

当出现Failed to start mysqld.service: Unit mysqld.service failed to load: No such file or directory

systemctl start mariadb.service

systemctl enable mariadb.service

强制进行修改密码

1、systemctl stop mysqld;

2、systemctl set-environment MYSQLD_OPTS="--skip-grant-tables”;

3、systemctl start mysqld;

4、mysql -u root;

5、use mysql;

6、update user set password=password('1234!@#$abc') where user='root' and host='localhost';  

6、FLUSH PRIVILEGES;

grant all privileges on *.* to 'root’@’192.168.4.14’ identified by ‘1234!@#$abc’ with grant option；

grant all privileges on *.* to 'root’@’10.255.3.3’ identified by ‘1234!@#$abc’ with grant option；