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
可以看到有两个安装包
删除这两个服务(去掉后缀)
rpm –e MySQL-client-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：
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[root@localhost
opt]# rpm -ivh MySQL-server-5.6.19-1.linux_glibc2.5.x86_64.rpm
Preparing...
########################################### [100%]
1:MySQL-server
########################################### [100%]
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卸载干净了安装输入如下：
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[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.
The
latest information about MySQL is
available on
the web at
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
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二就是安装完成，启动服务之后
使用命令：“mysql -uroot -p”输入你之前安装后设置的密码，看能不能登录，如果还可以登录，说明没有卸载干净！