MySQL无法启动的解决办法

mysql无法启动的解决办法

mysql无法启动

在停止mysql之后，执行了一些操作（如修改主机名），重新启动 mysql，发现起不来。 

[root@www ~]$ service mysql start 
starting mysql..^[[a.................................................................................................. error! the server quit without updating pid file (/disk/mysql/www.pid).
[root@www ~]$ service mysql stop 
 error! mysql server pid file could not be found!
[root@www ~]$ service mysql stop 
 error! mysql server pid file could not be found!
[root@www ~]$ service mysql start 
starting mysql..................
还是老样子，只好 ctr+c 掉。
[root@www ~]$
 

实在是启动不了，看一下日志：/disk/mysql/www.err 

120608 09:56:17 mysqld_safe starting mysqld daemon with databases from /disk/mysql
120608 9:56:17 [note] plugin 'federated' is disabled.
120608 9:56:17 innodb: the innodb memory heap is disabled
120608 9:56:17 innodb: mutexes and rw_locks use innodb's own implementation
120608 9:56:17 innodb: compressed tables use zlib 1.2.3
120608 9:56:17 innodb: using linux native aio
120608 9:56:17 innodb: initializing buffer pool, size = 128.0m
120608 9:56:17 innodb: completed initialization of buffer pool
innodb: unable to lock ./ibdata1, error: 11
innodb: check that you do not already have another mysqld process
innodb: using the same innodb data or log files.
120608 9:56:17 innodb: retrying to lock the first data file
innodb: unable to lock ./ibdata1, error: 11
innodb: check that you do not already have another mysqld process
innodb: using the same innodb data or log files.
innodb: unable to lock ./ibdata1, error: 11
innodb: check that you do not already have another mysqld process
innodb: using the same innodb data or log files.
innodb: unable to lock ./ibdata1, error: 11
...

 好像是原来的 mysqld 并没有停下来。

强制终止 mysqld

[root@www ~]$ ps -ef|grep mysql 
root   4769   1 0 jun06 ?    00:00:00 /bin/sh /usr/bin/mysqld_safe --datadir=/disk/mysql --pid-file=/disk/mysql/localhost.pid
mysql   4874 4769 0 jun06 ?    00:04:04 /usr/sbin/mysqld --basedir=/usr --datadir=/disk/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --log-error=/disk/mysql/localhost.err --pid-file=/disk/mysql/localhost.pid --socket=/disk/mysql/mysql.sock
root   17947   1 0 09:56 pts/1  00:00:00 /bin/sh /usr/bin/mysqld_safe --datadir=/disk/mysql --pid-file=/disk/mysql/www.pid
mysql  18052 17947 0 09:56 pts/1  00:00:00 /usr/sbin/mysqld --basedir=/usr --datadir=/disk/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --log-error=/disk/mysql/www.err --pid-file=/disk/mysql/www.pid --socket=/disk/mysql/mysql.sock
root   18099 17514 0 09:56 pts/1  00:00:00 grep mysql
[root@www ~]$ killall mysqld 
[root@www ~]$ killall mysqld 
[root@www ~]$ ps -ef|grep mysql 
root   18116 17514 0 09:57 pts/1  00:00:00 grep mysql
[root@www ~]$

 启动 mysqld ，现在执行多次启动命令都没有问题。

[root@www ~]$ service mysql start 
starting mysql. success! 
[root@www ~]$ 
[root@www ~]$ 
[root@www ~]$ 
[root@www ~]$ 
[root@www ~]$ service mysql start 
starting mysql success! 
[root@www ~]$
 

前面 www.err 文件中显示的 error: 11 到底是什么，看下：

[root@www ~]$ perror 11 
os error code 11: resource temporarily unavailable
[root@www ~]$ 
[root@www ~]$

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