CenterOS6.6 mysql升级过程

本身记录一下操做

centeros 6.6是新安装的用来作测试使用， 系统自带的mysql为5.1版本的，安装后发现不少应用包都须要更高版本的，手头有前短期下载的5.7版本的包，所以决定安装新的包。

一、先查询并卸载mysql的安装包

查询出来mysql的安装包

使用命令

yum list *mysql*

卸载包

yum groupremove mysql*

发现有些没有卸载掉，使用rpm命令卸载

rpm -e --nodeps 

二、安装包

所有使用rpm命令安装

rpm -ivh 按照惯例按顺序安装便可

安装完成后，启动mysql出现错误

2016-02-19T16:46:27.214854Z 0 [ERROR] InnoDB: The Auto-extending innodb_system data file './ibdata1' is of a

 different size 640 pages (rounded down to MB) than specified in the .cnf file: initial 768 pages, max 0 (re

levant if non-zero) pages!

2016-02-19T16:46:27.214891Z 0 [ERROR] InnoDB: Plugin initialization aborted with error Generic error

2016-02-19T16:46:27.821030Z 0 [ERROR] Plugin 'InnoDB' init function returned error.

2016-02-19T16:46:27.821067Z 0 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.

2016-02-19T16:46:27.821072Z 0 [ERROR] Failed to initialize plugins.

2016-02-19T16:46:27.821075Z 0 [ERROR] Aborting

这时删除/var/lib/mysql下的三个文件

再次启动mysql，出现错误

2016-02-19T16:51:11.019591Z 0 [ERROR] Fatal error: mysql.user table is damaged. Please run mysql_upgrade.
2016-02-19T16:51:11.019777Z 0 [ERROR] Aborting

使用以下命令，从新初始化mysql

mysqld --initialize --user=mysql

 

仍是报上述错误，删除/var/lib/mysql目录下的全部文件，再次执行初始化命令，成功。

启动mysql成功

三、mysql登陆及密码修改

登陆

[chb@centeros6 ~]$ mysqladmin -uroot -p root

Enter password: 

mysqladmin: connect to server at 'localhost' failed

error: 'Access denied for user 'root'@'localhost' (using password: YES)'

碰到这种状况，安全启动mysql

mysqld_safe --user=mysql --skip-grant-tables --skip-networking &

mysql

mysql> update user set authentication_string=PASSWORD('root') where user='root';
Query OK, 1 row affected, 1 warning (0.04 sec)
Rows matched: 1  Changed: 1  Warnings: 1


mysql> FLUSH PRIVILEGES;
Query OK, 0 rows affected (0.00 sec)

修改为功

从新启动mysql也成功

mysql登陆后，提示修改密码

mysql> show databases;
ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.
mysql> set PASSWORD=Password('root');
Query OK, 0 rows affected, 1 warning (0.00 sec)

 

mysql> alter user root@localhost PASSWORD EXPIRE NEVER;
Query OK, 0 rows affected (0.00 sec)


mysql> FLUSH PRIVILEGES;
Query OK, 0 rows affected (0.01 sec)

 

密码修改为功，密码也不提示过时了。