安裝mysql
- 1.下載mysql源安裝包
shell> wget http://dev.mysql.com/get/mysq...
- 2.安裝mysql源
shell> yum localinstall mysql57-community-release-el7-8.noarch.rpm
- 3.檢查mysql源是否安裝成功
shell> yum repolist enabled | grep "mysql.-community."
- 4.修改 vim /etc/yum.repos.d/mysql-community.repo源 ，改變默認安裝的mysql版本。比如要安裝5.6版本，將5.7源的enabled=1改成enabled=0。然後再將5.6源的enabled=0改成enabled=1即可。
- 5.安裝MySQL
shell> yum install mysql-community-server
- 6.啓動MySQL服務
shell> systemctl start mysqld
- 7.開機啓動
shell> systemctl enable mysqld
shell> systemctl daemon-reload
- 8.修改root本地登錄密碼
1）查看mysql密碼
shell> grep 'temporary password' /var/log/mysqld.log
2）連接mysql
shell> mysql -uroot -p
3）修改密碼[注意：後面的分號一定要跟上]
mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'MyNewPass4!';
或者：
mysql> set password for 'root'@'localhost'=password('MyNewPass4!');
mysql> show variables like '%password%';
- 9.添加遠程登錄用戶
mysql> GRANT ALL PRIVILEGES ON . TO 'caoxiaobo'@'%' IDENTIFIED BY 'Caoxiaobo0917!' WITH GRANT OPTION;
- 10.設置密碼安全規則
set global validate_password_policy=0;
set global validate_password_length=1; - 11.刷新映射關係
flush privileges;
卸載mysql
yum方式安裝的mysql
1、yum remove mysql mysql-server mysql-libs compat-mysql51
2、rm -rf /var/lib/mysql
3、rm /etc/my.cnf
查看是否還有mysql軟件：
rpm -qa|grep mysql
如果存在的話，繼續刪除即可。
rpm方式安裝的mysql
a）查看系統中是否以rpm包安裝的mysql：
[root@localhost opt]# rpm -qa | grep -i mysql
MySQL-server-5.6.17-1.el6.i686
MySQL-client-5.6.17-1.el6.i686
b)卸載mysql
[root@localhost local]# rpm -e MySQL-server-5.6.17-1.el6.i686
[root@localhost local]# rpm -e MySQL-client-5.6.17-1.el6.i686
c)刪除mysql服務
[root@localhost local]# chkconfig --list | grep -i mysql
[root@localhost local]# chkconfig --del mysql
d)刪除分散mysql文件夾
[root@localhost local]# whereis mysql 或者 find / -name mysql
mysql: /usr/lib/mysql /usr/share/mysql
清空相關mysql的所有目錄以及文件
rm -rf /usr/lib/mysql
rm -rf /usr/share/mysql
rm -rf /usr/my.cnf
【本文參考地址】(https://www.cnblogs.com/caoxb...
【參考2】(https://www.cnblogs.com/wangh...