Mariadb (mysql)

安装
yum list | grep mariadb
yum list | grep mariadb-server

yum install mariadb
yum install mariadb-server

systemctl start mariadb
systemctl is-enabled mariadb
systemctl enable mariadb
systemctl disable mariadb

未正常关闭
rm -f /var/lib/mysql/mysql.sock
service mysqld start

修改端口(添加)
vi /etc/my.cnf
[mysqld]
port=3306

指定主机登录
mysql -u root -p [-h 192.168.5.116] 

 

添加远程登陆用户
GRANT ALL PRIVILEGES ON *.* TO 'root'@'%'IDENTIFIED BY '123456' WITH GRANT OPTION;
GRANT ALL PRIVILEGES ON *.* TO 'user'@'localhost' IDENTIFIED BY 'password';
grant all on *.* to "root"@"%" identified by "123456";

FLUSH PRIVILEGES;

root@% 远程用户
root@:1 root@127.0.0.1 使用TCP/IP链接
root@localhost 使用Unix socket链接

 

临时密码
vi /etc/my.cnf
skip-grant-tables=1
update mysql.user set authentication_string=password('123456') where user='root' and Host ='localhost';

经过# grep "password" /var/log/mysqld.log 命令获取MySQL的临时密码
[Note] A temporary password is generated for root@localhost: waQ,qR%be2(5
用该密码登陆到服务端后，必须立刻修改密码, 且密码包含数字，小写，大写字母，特殊字符
ALTER USER USER() IDENTIFIED BY 'XXXX'

 

修改密码, 若有须要, 需在GRANT以后运行, 不然没法登录
mysqladmin -u root password 'newpassword'

修复
# systemctl stop mariadb
# mysqld_safe --user=mysql --skip-grant-tables --skip-networking &
# mysql -u root mysql
mysql> UPDATE user SET Password=PASSWORD('newpassword') where USER='root';
mysql> FLUSH PRIVILEGES;
mysql> quit
# systemctl start mariadb
# mysql -uroot -p
Enter password: <输入新设的密码newpassword>

CentOS7下载mysql的repo源
http://dev.mysql.com/downloads/repo/yum/
http://repo.mysql.com/

wget http://repo.mysql.com/mysql-community-release-el7-5.noarch.rpm
wget http://dev.mysql.com/get/mysql57-community-release-el7-8.noarch.rpm

sudo rpm -ivh mysql-community-release-el7-5.noarch.rpm
yum localinstall mysql57-community-release-el7-8.noarch.rpm

安装这个包后，会得到两个mysql的yum repo源：
/etc/yum.repos.d/mysql-community.repo，
/etc/yum.repos.d/mysql-community-source.repo
 

选择mysql安装版本
修改vim /etc/yum.repos.d/mysql-community.repo源，改变默认安装的mysql版本
好比要安装5.6版本，将5.7源的enabled=1改为enabled=0
而后再将5.6源的enabled=0改为enabled=1便可