一：查看下是否有系統自帶MySQL的rpm包，如果有，需要刪除自帶的舊rpm包。

[root@localhost?mnt]#?mysql?-V

mysql??Ver?14.14?Distrib?5.1.73,?for?redhat-linux-gnu?(x86_64)?using?readline?5.1

[root@localhost?mnt]#?rpm?-qa?|?grep?-i?mysql

mysql-server-5.1.73-8.el6_8.x86_64

mysql-5.1.73-8.el6_8.x86_64

mysql-devel-5.1.73-8.el6_8.x86_64

mysql-libs-5.1.73-8.el6_8.x86_64

perl-DBD-MySQL-4.013-3.el6.x86_64

[root@localhost?mnt]#?yum?remove?mysql*

二：在MySQL官網下載安裝MySQL-5.6.21所需的rpm軟件包。需要下載三個rpm軟件包：MySQL-client-5.6.21-1.rhel5.x86_64.rpmMySQL-devel-5.6.21-1.rhel5.x86_64.rpmMySQL-server-5.6.21-1.rhel5.x86_64.rpm

[root@linuxidc?/mnt]#wget?http://dev.mysql.com/Downloads/MySQL-5.6/MySQL-server-5.6.21-1.rhel5.x86_64.rpm

[root@linuxidc?/mnt]#wget?http://dev.mysql.com/Downloads/MySQL-5.6/MySQL-devel-5.6.21-1.rhel5.x86_64.rpm

[root@linuxidc?/mnt]#wget?http://dev.mysql.com/Downloads/MySQL-5.6/MySQL-client-5.6.21-1.rhel5.x86_64.rpm

報錯：

wget?http://dev.mysql.com/Downloads/MySQL-5.6/MySQL-server-5.6.21-1.rhel5.x86_64.rpm

--2017-09-14?17:07:49--??http://dev.mysql.com/Downloads/MySQL-5.6/MySQL-server-5.6.21-1.rhel5.x86_64.rpm

正在解析主機?dev.mysql.com...?137.254.60.11

正在連接?dev.mysql.com|137.254.60.11|:80...?已連接。

已發出?HTTP?請求，正在等待回應...?301?Moved?Permanently

位置：https://dev.mysql.com/Downloads/MySQL-5.6/MySQL-server-5.6.21-1.rhel5.x86_64.rpm?[跟隨至新的?URL]

--2017-09-14?17:07:50--??https://dev.mysql.com/Downloads/MySQL-5.6/MySQL-server-5.6.21-1.rhel5.x86_64.rpm

正在連接?dev.mysql.com|137.254.60.11|:443...?已連接。

錯誤:?證書通用名?“www.mysql.com”?與所要求的主機名?“dev.mysql.com”?不符。

要以不安全的方式連接至?dev.mysql.com，使用‘--no-check-certificate’。

所以添加提示參數：

[root@linuxidc?/mnt]#wget?--no-check-certificate?http://dev.mysql.com/Downloads/MySQL-5.6/MySQL-server-5.6.21-1.rhel5.x86_64.rpm

[root@linuxidc?/mnt]#wget?--no-check-certificate?http://dev.mysql.com/Downloads/MySQL-5.6/MySQL-devel-5.6.21-1.rhel5.x86_64.rpm

[root@linuxidc?/mnt]#wget?--no-check-certificate?http://dev.mysql.com/Downloads/MySQL-5.6/MySQL-client-5.6.21-1.rhel5.x86_64.rpm

然后安裝：

[root@localhost?~]#?rpm?-ivh?MySQL-client-5.6.21-1.rhel5.x86_64.rpm

Preparing...????????????????###########################################?[100%]

1:MySQL-client???????????###########################################?[100%]

[root@localhost?~]#?rpm?-ivh?MySQL-devel-5.6.21-1.rhel5.x86_64.rpm

Preparing...????????????????###########################################?[100%]

1:MySQL-devel????????????###########################################?[100%]

[root@localhost?~]#?rpm?-ivh?MySQL-server-5.6.21-1.rhel5.x86_64.rpm

error:?Failed?dependencies:

libaio.so.1()(64bit)?is?needed?by?MySQL-server-5.6.21-1.rhel5.x86_64

libaio.so.1(LIBAIO_0.1)(64bit)?is?needed?by?MySQL-server-5.6.21-1.rhel5.x86_64

libaio.so.1(LIBAIO_0.4)(64bit)?is?needed?by?MySQL-server-5.6.21-1.rhel5.x86_64

報錯：按著提示，繼續安裝libaio庫

[root@localhost?~]#?yum?install?libaio

三：啟動mysql，報錯

[root@localhost?opt]#?service?mysql?restart

ERROR!?MySQL?server?PID?file?could?not?be?found!

Starting?MySQL.?ERROR!?The?server?quit?without?updating?PID?file?(/var/lib/mysql/localhost.pid).

本次解決方法：

cd /var/lib/mysql

rm -rf ibdata1 ib_logfile1 ib_logfile0

此時：

service?mysql?restart

Shutting?down?MySQL..?SUCCESS!

Starting?MySQL.?SUCCESS!

總結

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