centos7安装mysql数据库并且授权问题

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

 当出现报错信息如下：

140524 03:15:57 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
140524  3:15:57 [ERROR] Can't open the mysql.plugin table. Please run mysql_upgrade to create it.
140524  3:15:57  InnoDB: Initializing buffer pool, size = 8.0M
140524  3:15:57  InnoDB: Completed initialization of buffer pool
140524  3:15:57  InnoDB: Started; log sequence number 0 44233
140524  3:15:57 [ERROR] Fatal error: Can't open and lock privilege tables: Table 'mysql.host' doesn't exist
140524 03:15:57 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended

解决办法：mysql_install_db --user=mysql --ldata=/var/lib/mysql/

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

systemctl stop mysqld;

systemctl set-environment MYSQLD_OPTS="--skip-grant-tables";

systemctl start mysqld;

mysql -u root;

use mysql;

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

FLUSH PRIVILEGES; 

 远程授权数据库登陆：

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；