1、解除安裝mysql

（1）、檢視已裝的mysql版本

1. [[email protected] ~]# yum list installed | grep mysql

2. mysql.x86_64 5.1.73-8.el6_8 @base

3. mysql-devel.x86_64 5.1.73-8.el6_8 @base

4. mysql-libs.x86_64 5.1.73-8.el6_8 @base

5. mysql-server.x86_64 5.1.73-8.el6_8 @base

（2）、依次解除安裝，有依賴關係

[[email protected]
 
 ~]# yum -y remove mysql-5.1.73-8.el6_8.x86_64

[[email protected] ~]# yum -y remove mysql-libs.x86_64

（3）、再次檢視，解除安裝完成

1. [[email protected] ~]# rpm -qa|grep mysql

2. [[email protected] ~]#

（4）、檢視系統自帶的mysql

1. [[email protected] ~]# yum list | grep mysql

2. apr-util-mysql.x86_64 1.3.9-3.el6_0.1 base

3. bacula-director-mysql.x86_64 5.0.0-13.el6 base

4. bacula-storage-mysql.x86_64 5.0.0-13.el6 base

5. dovecot-mysql.x86_64 1:2.0.9-22.el6 base

6. freeradius-mysql.x86_64 2.2.6-7.el6_9 updates

7. libdbi-dbd-mysql.x86_64 0.8.3-5.1.el6 base

8. mod_auth_mysql.x86_64 1:3.0.0-11.el6_0.1 base

9. mysql.x86_64 5.1.73-8.el6_8 base

10. mysql-bench.x86_64 5.1.73-8.el6_8 base

11. mysql-connector-java.noarch 1:5.1.17-6.el6 base

12. mysql-connector-odbc.x86_64 5.1.5r1144-7.el6 base

13. mysql-devel.i686 5.1.73-8.el6_8 base

14. mysql-devel.x86_64 5.1.73-8.el6_8 base

版本過低，選擇其他的源

2、安裝mysql

（1）獲取其它源

1. [[email protected] ~]# cd /etc/yum.repos.d

2. [[email protected] yum.repos.d]# wget http://dev.mysql.com/get/mysql-community-release-el6-5.noarch.rpm

（2）安裝

[[email protected] yum.repos.d]# yum install mysql-community-release-el6-5.noarch.rpm 

[[email protected] yum.repos.d]# yum install mysql mysql-server

（3）啟動

[[email protected] yum.repos.d]# service mysqld start

（4）呵呵呵，報錯了

1. [[email protected] yum.repos.d]# service mysqld start

2. MySQL Daemon failed to start.

3. Starting mysqld: [FAILED]

（5）原因：我上個刪除的mysql沒有刪除歷史資料庫檔案

解決方法：刪除資料庫檔案

[[email protected] yum.repos.d]# cd /var/lib

[[email protected] lib]# rm -rf mysql

[[email protected] lib]# mkdir mysql

（6）再次啟動  

[[email protected] lib]# service mysqld start

（7）檢視版本

1. [[email protected] lib]# mysql -V

2. mysql Ver 14.14 Distrib 5.6.38, for Linux (x86_64) using EditLine wrapper

（8）修改密碼

1. [[email protected] lib]# mysqladmin -u root password 123456

2. Warning: Using a password on the command line interface can be insecure.

3. [[email protected] lib]# mysql -u root -p

3、成功！