环境：
[wh42@e3ddba14 ABS_CORP]$ cat /etc/redhat-release
CentOS release 6.3 (Final)
[wh42@e3ddba14 ABS_CORP]$ uname -a
Linux e3ddba14 2.6.32-279.el6.x86_64 #1 SMP Fri Jun 22 12:19:21 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux
--安装Mysql：
首先准备好mysql group和user
[wh42@e3ddba12 ~]$ sudo groupadd mysql
groupadd: cannot open /etc/group
发现报错
需要执行[wh42@e3ddba12 ~]$ sudo ulock
[wh42@e3ddba11 ~]$ sudo groupadd mysql
[wh42@e3ddba11 ~]$ sudo useradd -g mysql mysql
其次安装mysql
[wh42@e3ddba11 ~]$ sudo yum install -y mysql
[wh42@e3ddba11 ~]$ sudo yum install -y mysql-server
[wh42@e3ddba11 ~]$ sudo yum install -y mysql-devel
修改/var/lib/mysql的权限
[wh42@e3ddba11 lib]$ sudo chgrp -R mysql /var/lib/mysql
[wh42@e3ddba11 lib]$ sudo chown -R mysql:mysql /var/lib/mysql/
尝试连接mysql
[wh42@e3ddba11 lib]$ mysql
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)
检查发现该路径下的mysql.sock并不存在
[wh42@e3ddba11 ~]$ cd /var/lib/mysql/
[wh42@e3ddba11 mysql]$ ll
total 0
此时看到mysql服务并未启动
[wh42@e3ddba11 mysql]$ sudo service mysqld status
mysqld is stopped
尝试启动mysql服务
[wh42@e3ddba11 mysql]$ sudo service mysqld start
Initializing MySQL database: Installing MySQL system tables...
OK
Filling help tables...
OK
To start mysqld at boot time you have to copy
support-files/mysql.server to the right place for your system
PLEASE REMEMBER TO SET A PASSWORD FOR THE MySQL root USER !
To do so, start the server, then issue the following commands:
/usr/bin/mysqladmin -u root password 'new-password'
/usr/bin/mysqladmin -u root -h e3ddba12 password 'new-password'
Alternatively you can run:
/usr/bin/mysql_secure_installation
which will also give you the option of removing the test
databases and anonymous user created by default. This is
strongly recommended for production servers.
See the manual for more instructions.
You can start the MySQL daemon with:
cd /usr ; /usr/bin/mysqld_safe &
You can test the MySQL daemon with mysql-test-run.pl
cd /usr/mysql-test ; perl mysql-test-run.pl
Please report any problems with the /usr/bin/mysqlbug script!
[ OK ]
Starting mysqld: [ OK ]
[wh42@e3ddba11 mysql]$ ll
total 20488
-rw-rw---- 1 mysql mysql 10485760 Apr 1 22:30 ibdata1
-rw-rw---- 1 mysql mysql 5242880 Apr 1 22:30 ib_logfile0
-rw-rw---- 1 mysql mysql 5242880 Apr 1 22:30 ib_logfile1
drwx------ 2 mysql mysql 4096 Apr 1 22:30 mysql
srwxrwxrwx 1 mysql mysql 0 Apr 1 22:30 mysql.sock
drwx------ 2 mysql mysql 4096 Apr 1 22:30 test
此时连接mysql服务，修改root密码。
[wh42@e3ddba11 bin]$ sudo service mysqld stop
Stopping mysqld: [ OK ]
[wh42@e3ddba11 bin]$ cd /usr/bin/
[wh42@e3ddba11 bin]$ sudo mysqld_safe --user=root --skip-grant-tables --skip-networking
140401 20:35:22 mysqld_safe Logging to '/var/log/mysqld.log'.
140401 20:35:22 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
新开一个窗口
[wh42@e3ddba11 ~]$ mysql -u root mysql
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Welcome to the MySQL monitor. Commands end with ; or g.
Your MySQL connection id is 1
Server version: 5.1.61 Source distribution
Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or 'h' for help. Type 'c' to clear the current input statement.
mysql> update user set password=password('wison') where user='root';
Query OK, 0 rows affected (0.00 sec)
Rows matched: 3 Changed: 0 Warnings: 0
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
mysql> quit;
Bye
[wh42@e3ddba11 ~]$ sudo service mysqld start
Starting mysqld: [ OK ]
此时，就可以使用下面的命令连接到Mysql数据库
[wh42@e3ddba11 ~]$ mysql -uroot -pwison
Welcome to the MySQL monitor. Commands end with ; or g.
Your MySQL connection id is 4
Server version: 5.1.61 Source distribution
Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or 'h' for help. Type 'c' to clear the current input statement.
mysql>
最后需要把mysql服务设置为随系统启动自动启动
检查mysql服务是否自动启动
[wh42@e3ddba12 ~]$ sudo chkconfig --list mysqld
mysqld 0:off 1:off 2:off 3:off 4:off 5:off 6:off
设置mysql服务随系统启动自动启动
[wh42@e3ddba12 ~]$ sudo chkconfig mysqld on
确认已经设置为自动启动，2-5必须为on
[wh42@e3ddba12 ~]$ sudo chkconfig --list mysqld
mysqld 0:off 1:off 2:on 3:on 4:on 5:on 6:off
之后测试是否自动重启
[wh42@e3ddba12 ~]$sudo init 6
当启动之后，可以看到
[wh42@e3ddba11 ~]$ sudo service mysqld status
mysqld (pid 1485) is running...