出處：https://my.oschina.net/zhangjie830621/blog/466279

CentOS下如何完全卸載MySQL？解決卸載不干凈的問題

系統：CentOS 6.5，MySQL：MySql 5.6

這里主要解決使用rpm安裝的卸載問題，安裝方法見：CentOS安裝mysql*.rpm提示conflicts with file from package的解決辦法

雖然說這里的是使用rpm安裝的卸載問題，我覺得使用yum方式安裝的如果遇到相同的問題也一樣適用。

查看已經安裝的服務

rpm –qa|grep -i mysql

-i 作用是不區分大小寫

yum remove mysql mysql-server mysql-libs compat-mysql51 rm -rf /var/lib/mysql rm /etc/my.cnf 查看是否還有mysql軟件： rpm -qa|grep mysql 有的話繼續刪除

可以看到有兩個安裝包

MySQL-server-5.6.19-1.linux_glibc2.5.x86_64.rpm
MySQL-client-5.6.19-1.linux_glibc2.5.x86_64.rpm

刪除這兩個服務(去掉后綴)

rpm –e MySQL-client-5.6.19-1.linux_glibc2.5.x86_64
rpm -e MySQL-server-5.6.19-1.linux_glibc2.5.x86_64

查看殘留的目錄：

whereis mysql

然后刪除mysql目錄：

rm –rf /usr/lib64/mysql

刪除相關文件：

rm –rf /usr/my.cnf
rm -rf /root/.mysql_sercret

最關鍵的：

rm -rf /var/lib/mysql

如果這個目錄如果不刪除，再重新安裝之后，密碼還是之前的密碼，不會重新初始化！

網上查了很久都沒有文章提到這個，最后還是自己摸索找出來的。

卸載完成！怎么確定是不是真的卸載干凈了呢？

一是看安裝輸出：

如果沒有卸載干凈，安裝server時輸入只有兩行：

[root?@localhost?opt]# rpm -ivh MySQL-server-5.6.19-1.linux_glibc2.5.x86_64.rpm?
Preparing...??????????????? ########################################### [100%]?
?? 1:MySQL-server?????????? ########################################### [100%]?

卸載干凈了安裝輸入如下：

[root?@localhost?opt]# rpm -ivh MySQL-server-5.6.19-1.linux_glibc2.5.x86_64.rpm?
Preparing...??????????????? ########################################### [100%]?
?? 1:MySQL-server?????????? ########################################### [100%]?
2014-09-23 07:22:43 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).?
2014-09-23 07:22:43 26041 [Note] InnoDB: Using atomics to ref count buffer pool pages?
2014-09-23 07:22:43 26041 [Note] InnoDB: The InnoDB memory heap is disabled?
2014-09-23 07:22:43 26041 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins?
2014-09-23 07:22:43 26041 [Note] InnoDB: Compressed tables use zlib 1.2.3?
2014-09-23 07:22:43 26041 [Note] InnoDB: Using Linux native AIO?
2014-09-23 07:22:43 26041 [Note] InnoDB: Using CPU crc32 instructions?
2014-09-23 07:22:43 26041 [Note] InnoDB: Initializing buffer pool, size = 128.0M?
2014-09-23 07:22:43 26041 [Note] InnoDB: Completed initialization of buffer pool?
2014-09-23 07:22:43 26041 [Note] InnoDB: The first specified data file ./ibdata1 did not exist: a new database to be created!?
2014-09-23 07:22:43 26041 [Note] InnoDB: Setting file ./ibdata1 size to 12 MB?
2014-09-23 07:22:43 26041 [Note] InnoDB: Database physically writes the file full: wait...?
2014-09-23 07:22:43 26041 [Note] InnoDB: Setting log file ./ib_logfile101 size to 48 MB?
2014-09-23 07:22:43 26041 [Note] InnoDB: Setting log file ./ib_logfile1 size to 48 MB?
2014-09-23 07:22:45 26041 [Note] InnoDB: Renaming log file ./ib_logfile101 to ./ib_logfile0?
2014-09-23 07:22:45 26041 [Warning] InnoDB: New log files created, LSN=45781?
2014-09-23 07:22:45 26041 [Note] InnoDB: Doublewrite buffer not found: creating new?
2014-09-23 07:22:45 26041 [Note] InnoDB: Doublewrite buffer created?
2014-09-23 07:22:45 26041 [Note] InnoDB: 128 rollback segment(s) are active.?
2014-09-23 07:22:45 26041 [Warning] InnoDB: Creating foreign key constraint system tables.?
2014-09-23 07:22:45 26041 [Note] InnoDB: Foreign key constraint system tables created?
2014-09-23 07:22:45 26041 [Note] InnoDB: Creating tablespace and datafile system tables.?
2014-09-23 07:22:45 26041 [Note] InnoDB: Tablespace and datafile system tables created.?
2014-09-23 07:22:45 26041 [Note] InnoDB: Waiting for purge to start?
2014-09-23 07:22:45 26041 [Note] InnoDB: 5.6.19 started; log sequence number 0?
A random root password has been set. You will find it in '/root/.mysql_secret'.?
2014-09-23 07:22:46 26041 [Note] Binlog end?
2014-09-23 07:22:46 26041 [Note] InnoDB: FTS optimize thread exiting.?
2014-09-23 07:22:46 26041 [Note] InnoDB: Starting shutdown...?
2014-09-23 07:22:48 26041 [Note] InnoDB: Shutdown completed; log sequence number 1625977?


2014-09-23 07:22:48 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).?
2014-09-23 07:22:48 26065 [Note] InnoDB: Using atomics to ref count buffer pool pages?
2014-09-23 07:22:48 26065 [Note] InnoDB: The InnoDB memory heap is disabled?
2014-09-23 07:22:48 26065 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins?
2014-09-23 07:22:48 26065 [Note] InnoDB: Compressed tables use zlib 1.2.3?
2014-09-23 07:22:48 26065 [Note] InnoDB: Using Linux native AIO?
2014-09-23 07:22:48 26065 [Note] InnoDB: Using CPU crc32 instructions?
2014-09-23 07:22:48 26065 [Note] InnoDB: Initializing buffer pool, size = 128.0M?
2014-09-23 07:22:48 26065 [Note] InnoDB: Completed initialization of buffer pool?
2014-09-23 07:22:48 26065 [Note] InnoDB: Highest supported file format is Barracuda.?
2014-09-23 07:22:48 26065 [Note] InnoDB: 128 rollback segment(s) are active.?
2014-09-23 07:22:48 26065 [Note] InnoDB: Waiting for purge to start?
2014-09-23 07:22:48 26065 [Note] InnoDB: 5.6.19 started; log sequence number 1625977?
2014-09-23 07:22:48 26065 [Note] Binlog end?
2014-09-23 07:22:48 26065 [Note] InnoDB: FTS optimize thread exiting.?
2014-09-23 07:22:48 26065 [Note] InnoDB: Starting shutdown...?
2014-09-23 07:22:50 26065 [Note] InnoDB: Shutdown completed; log sequence number 1625987?




A RANDOM PASSWORD HAS BEEN SET FOR THE MySQL root USER !?
You will find that password in '/root/.mysql_secret'.?

You must change that password on your first connect,?
no other statement but 'SET PASSWORD' will be accepted.?
See the manual for the semantics of the 'password expired' flag.?

Also, the account for the anonymous user has been removed.?

In addition, you can run:?

? /usr/bin/mysql_secure_installation?

which will also give you the option of removing the test database.?
This is strongly recommended for production servers.?

See the manual for more instructions.?

Please report any problems at http://bugs.mysql.com/?

The latest information about MySQL is available on the web at?

? http://www.mysql.com?

Support MySQL by buying support/licenses at http://shop.mysql.com?

New default config file was created as /usr/my.cnf and?
will be used by default by the server when you start it.?
You may edit this file to change server settings?


最后一段中提示了重要信息，很多人因為不喜歡讀英文，導致接下來不知道怎么操作！

二就是安裝完成，啟動服務之后

使用命令：“mysql -uroot -p”輸入你之前安裝后設置的密碼，看能不能登錄，如果還可以登錄，說明沒有卸載干凈！

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