MySQL Study之--MySQL启动错误“/var/lib/mysql/mysql.sock”

MySQL Study之--MySQL启动错误“/var/lib/mysql/mysql.sock”
系统环境：
操作系统： RedHat EL6.4(64)
MySQL: Percona Server 5.6

错误现象：





查看数据库的启动：
[root@localhost ~]# netstat -an |grep :3306

tcp 0 0 :::3306 :::* LISTEN

[root@localhost ~]# chkconfig --list |grep mysql

mysql 0:off 1:off 2:on 3:on 4:on 5:on 6:off



重新启动Server：
[root@localhost mysql]# service mysql start

Starting MySQL (Percona Server).....................................................................................................The server quit without updating PID file (/var/lib/mysql/localhost.localdomain.pid).[FAILED]

查看错误日志：

[root@rh64 ~]# more /var/log/mysqld.log

150908 16:01:49 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql

2015-09-08 16:01:49 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defa

ults_for_timestamp server option (see documentation for more details).

2015-09-08 16:01:49 0 [Note] /usr/sbin/mysqld (mysqld 5.6.25-73.1) starting as process 3349 ...

2015-09-08 16:01:49 3349 [Note] Plugin 'FEDERATED' is disabled.

2015-09-08 16:01:49 3349 [Note] InnoDB: Using atomics to ref count buffer pool pages

2015-09-08 16:01:49 3349 [Note] InnoDB: The InnoDB memory heap is disabled

2015-09-08 16:01:49 3349 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins

2015-09-08 16:01:49 3349 [Note] InnoDB: Memory barrier is not used

2015-09-08 16:01:49 3349 [Note] InnoDB: Compressed tables use zlib 1.2.3

2015-09-08 16:01:49 3349 [Note] InnoDB: Using Linux native AIO

2015-09-08 16:01:49 3349 [Note] InnoDB: Not using CPU crc32 instructions

2015-09-08 16:01:49 3349 [Note] InnoDB: Initializing buffer pool, size = 128.0M

2015-09-08 16:01:49 3349 [Note] InnoDB: Completed initialization of buffer pool

2015-09-08 16:01:49 3349 [ERROR] InnoDB: Unable to lock ./ibdata1, error: 11

2015-09-08 16:01:49 3349 [Note] InnoDB: Check that you do not already have another mysqld process using the sam

e InnoDB data or log files.

2015-09-08 16:01:49 3349 [Note] InnoDB: Retrying to lock the first data file

2015-09-08 16:01:50 3349 [ERROR] InnoDB: Unable to lock ./ibdata1, error: 11

2015-09-08 16:01:50 3349 [Note] InnoDB: Check that you do not already have another mysqld process using the sam

e InnoDB data or log files.

2015-09-08 16:01:51 3349 [ERROR] InnoDB: Unable to lock ./ibdata1, error: 11

2015-09-08 16:01:51 3349 [Note] InnoDB: Check that you do not already have another mysqld process using the sam

e InnoDB data or log files.

2015-09-08 16:01:52 3349 [ERROR] InnoDB: Unable to lock ./ibdata1, error: 11

2015-09-08 16:01:52 3349 [Note] InnoDB: Check that you do not already have another mysqld process using the sam

e InnoDB data or log files.

2015-09-08 16:01:53 3349 [ERROR] InnoDB: Unable to lock ./ibdata1, error: 11

2015-09-08 16:01:53 3349 [Note] InnoDB: Check that you do not already have another mysqld process using the sam

e InnoDB data or log files.

2015-09-08 16:01:54 3349 [ERROR] InnoDB: Unable to lock ./ibdata1, error: 11

2015-09-08 16:01:54 3349 [Note] InnoDB: Check that you do not already have another mysqld process using the sam

e InnoDB data or log files.

2015-09-08 16:01:55 3349 [ERROR] InnoDB: Unable to lock ./ibdata1, error: 11

2015-09-08 16:01:55 3349 [Note] InnoDB: Check that you do not already have another mysqld process using the sam

e InnoDB data or log files.

2015-09-08 16:01:56 3349 [ERROR] InnoDB: Unable to lock ./ibdata1, error: 11

在安装Linux系统时，系统自带了mysql server，卸载系统自带mysql server；但系统启动是，会自动启动原来的mysql server，导致启动后面安装的Percona Server无法启动，关闭mysql server在系统的自动启动。

[root@localhost ~]# chkconfig --list |grep mysql

mysql 0:off 1:off 2:on 3:on 4:on 5:on 6:off

[root@localhost ~]# chkconfig --level 235 mysql off

[root@localhost ~]# service mysql stop

MySQL (Percona Server) PID file could not be found![FAILED]

[root@localhost ~]# chkconfig --list |grep mysql

mysql 0:off 1:off 2:off 3:off 4:on 5:off 6:off

[root@localhost ~]# netstat -an |grep :3306

tcp 0 0 :::3306 :::* LISTEN

重新启动系统：

[root@rh64 ~]# service mysql start

Starting MySQL (Percona Server)..[ OK ]

[root@rh64 ~]# mysql -u root -p

Enter password:

Welcome to the MySQL monitor. Commands end with ; or \g.

Your MySQL connection id is 1

Server version: 5.6.25-73.1 Percona Server (GPL), Release 73.1, Revision 07b797f

Copyright (c) 2009-2015 Percona LLC and/or its affiliates

Copyright (c) 2000, 2015, 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>

mysql server正常启动！

查看系统信息：



[root@rh64 ~]# ls -l /var/lib/mysql

total 110620

-rw-rw----. 1 mysql mysql 56 Sep 6 18:08 auto.cnf

-rw-rw----. 1 mysql mysql 12582912 Sep 8 16:18 ibdata1

-rw-rw----. 1 mysql mysql 50331648 Sep 8 16:18 ib_logfile0

-rw-rw----. 1 mysql mysql 50331648 Sep 6 18:06 ib_logfile1

drwx------. 2 mysql mysql 4096 Sep 6 18:06 mysql

srwxrwxrwx. 1 mysql mysql 0 Sep 8 16:18 mysql.sock

drwx------. 2 mysql mysql 4096 Sep 6 18:06 performance_schema

-rw-rw----. 1 mysql mysql 5 Sep 8 16:18 rh64.pid

-rw-r--r--. 1 root root 293 Sep 6 18:07 RPM_UPGRADE_HISTORY

-rw-r--r--. 1 mysql mysql 293 Sep 6 18:07 RPM_UPGRADE_MARKER-LAST

drwx------. 2 mysql mysql 4096 Sep 6 18:06 test

查看系统日志：

[root@rh64 ~]# tail /var/log/mysqld.log

2015-09-08 16:18:10 2370 [Note] InnoDB: Percona XtraDB (http://www.percona.com) 5.6.25-73.1 started; log sequence number 1626017

2015-09-08 16:18:10 2370 [Note] RSA private key file not found: /var/lib/mysql//private_key.pem. Some authentication plugins will not work.

2015-09-08 16:18:10 2370 [Note] RSA public key file not found: /var/lib/mysql//public_key.pem. Some authentication plugins will not work.

2015-09-08 16:18:10 2370 [Note] Server hostname (bind-address): '*'; port: 3306

2015-09-08 16:18:10 2370 [Note] IPv6 is available.

2015-09-08 16:18:10 2370 [Note] - '::' resolves to '::';

2015-09-08 16:18:10 2370 [Note] Server socket created on IP: '::'.

2015-09-08 16:18:10 2370 [Note] Event Scheduler: Loaded 0 events

2015-09-08 16:18:10 2370 [Note] /usr/sbin/mysqld: ready for connections.

Version: '5.6.25-73.1' socket: '/var/lib/mysql/mysql.sock' port: 3306 Percona Server (GPL), Release 73.1, Revision 07b797f