CentOS下如何完全卸载MySQL？解决卸载不干净的问题

CentOS下如何完全卸载MySQL？解决卸载不干净的问题

系统：CentOS 6.5，MySQL：MySql 5.6

这里主要解决使用rpm安装的卸载问题，安装方法见：CentOS安装mysql*.rpm提示conflicts
with file from package的解决办法

虽然说这里的是使用rpm安装的卸载问题，我觉得使用yum方式安装的如果遇到相同的问题也一样适用。

查看已经安装的服务

rpm –qa|grep -i mysql

-i 作用是不区分大小写

yum remove mysql mysql-server mysql-libs compat-mysql51
rm -rf /var/lib/mysql
rm /etc/my.cnf
查看是否还有mysql软件：
rpm -qa|grep mysql
有的话继续删除

可以看到有两个安装包

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

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

删除这两个服务(去掉后缀)

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

查看残留的目录：

whereis mysql

然后删除mysql目录：

rm –rf /usr/lib64/mysql

删除相关文件：

rm –rf /usr/my.cnf

rm -rf /root/.mysql_sercret

最关键的：

rm -rf /var/lib/mysql

如果这个目录如果不删除，再重新安装之后，密码还是之前的密码，不会重新初始化！

网上查了很久都没有文章提到这个，最后还是自己摸索找出来的。

卸载完成！怎么确定是不是真的卸载干净了呢？

一是看安装输出：

如果没有卸载干净，安装server时输入只有两行：

[root @localhost opt]# rpm -ivh MySQL-server-5.6.19-1.linux_glibc2.5.x86_64.rpm 

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

   1:MySQL-server           ########################################### [100%] 

卸载干净了安装输入如下：

[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,