因为根目录磁盘满了，我移动数据和软件造成mysql启动不了，查原因mysql.sock不在了

Arce

　　今天刚接手新项目的服务器，不知道以前谁搭建的
　　因为要备份数据库，但是发现空间不足
　　 /根目录满的，然后我移动软件和文件
　　造成 mysql启动不了

root@localhost ~]# /data/mysql/bin/mysqldump  --databases star -uroot -p123456 > /home/star.sql
mysqldump: Couldn't execute 'show fields from `c_help`': Got error 28 from storage engine (1030)

[root@localhost ~]# df -lh
Filesystem      Size  Used Avail Use% Mounted on
/dev/sda3       2.0G  2.0G   0 100% /
/dev/sda5       246G   29G  205G  13% /data
/dev/sda1        99M   12M   82M  13% /boot
tmpfs         7.9G   0  7.9G   0% /dev/shm

发现空间不足，也不知道谁搭建的服务器，坑死我了
root@localhost share]# mv * /data/ceshi/share/
[root@localhost share]# df -Th
Filesystem  Type  Size  Used Avail Use% Mounted on
/dev/sda3   ext3  2.0G  1.5G  382M  80% /
/dev/sda5   ext3  246G   24G  209G  11% /data
/dev/sda1   ext3   99M   12M   82M  13% /boot
tmpfs    tmpfs  7.9G   0  7.9G   0% /dev/shm

　　mysql.sock不在了

[root@localhost tmp]# locate mysql.sock
[root@localhost tmp]# /data/mysql/
bin/    data/     include/  lib/    libexec/  log/    mysql-test/ share/    sql-bench/
[root@localhost tmp]# /data/mysql/bin/mysql start
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)

　　没有进程

[root@localhost tmp]# killall mysqld
mysqld: no process killed

　　

[root@localhost tmp]# ps -aux | grep mysqld
Warning: bad syntax, perhaps a bogus '-'? See /usr/share/doc/procps-3.2.7/FAQ
root   22246  0.0  0.0  61196   720 pts/2  S+   13:14   0:00 grep mysqld

[root@localhost tmp]# more /etc/my.cnf|grep sock
socket=/var/lib/mysql/mysql.sock
[root@localhost tmp]# cd /var/lib/mysql/mysql.s

　　太奇葩了这问题

　　查看报错日志
　　

140104  3:00:02 [ERROR] /data/mysql/libexec/mysqld: Sort aborted
140105  3:00:02 [ERROR] /data/mysql/libexec/mysqld: Sort aborted
140106  3:00:01 [ERROR] /data/mysql/libexec/mysqld: Sort aborted
140107  3:00:01 [ERROR] /data/mysql/libexec/mysqld: Sort aborted
140324 12:09:26 [Note] /data/mysql/libexec/mysqld: Normal shutdown
140324 12:09:26 [Note] Slave I/O thread killed while reading event
140324 12:09:26 [Note] Slave I/O thread exiting, read up to log 'mysql-bin.000013', position 54495054
140324 12:09:26 [Note] Error reading relay log event: slave SQL thread was killed
140324 12:09:44  InnoDB: Starting shutdown...
140324 12:09:46  InnoDB: Shutdown completed; log sequence number 0 1573472989
140324 12:09:46 [Note] /data/mysql/libexec/mysqld: Shutdown complete

　　

[root@localhost tmp]# ps -ef | grep mysqld
root   22330 20131  0 13:24 pts/2  00:00:00 grep mysqld
[root@localhost tmp]# ps -ef | grep mysql
root   22332 20131  0 13:24 pts/2  00:00:00 grep mysql

　　发现

[root@localhost mysql]# ./
bin/    data/     include/  lib/    libexec/  log/    mysql-test/ share/    sql-bench/
[root@localhost mysql]# ./bin/
comp_err          mysqlbinlog         mysql_find_rows       mysqltestmanagerc
innochecksum        mysqlbug          mysql_fix_extensions    mysqltestmanager-pwgen
msql2mysql          mysqlcheck          mysql_fix_privilege_tables  mysql_tzinfo_to_sql
myisamchk           mysql_client_test       mysqlhotcopy        mysql_upgrade
myisam_ftdump         mysql_config        mysqlimport         mysql_upgrade_shell
myisamlog           mysql_convert_table_format  mysql_install_db      mysql_waitpid
myisampack          mysqld_multi        mysql_secure_installation   mysql_zap
my_print_defaults       mysqld_safe         mysql_setpermission     perror
mysql             mysqldump           mysqlshow           replace
mysqlaccess         mysqldumpslow         mysql_tableinfo       resolveip
mysqladmin          mysql_explain_log       mysqltest           resolve_stack_dump
[root@localhost mysql]# ./bin/mysqld_safe &
[1] 22367
[root@localhost mysql]# Starting mysqld daemon with databases from /data/mysql/data
[root@localhost mysql]# /data/mysql/bin/mysql -uroot -p123456
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 15
Server version: 5.0.88-log Source distribution
No entry for terminal type "xterm";
using dumb terminal settings.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> Ctrl-C -- exit!
Aborted
[root@localhost mysql]# cd /tmp/
.ICE-unix/  mysql.sock
[root@localhost mysql]# cd /tmp/

　　终于进去了

　　

　　终于备份好了，为了以后不必要的麻烦，添加service管理

[root@localhost data]# cp /data/mysql/share/mysql/mysql.server /etc/init.d/mysql
[root@localhost data]# cd /etc/init.d/
[root@localhost init.d]# chkconfig --add mysql
[root@localhost init.d]# chkconfig mysql on

　　这样方便多了

[root@localhost init.d]# service mysql stop
MySQL manager or server PID file could not be found!     [FAILED]
[root@localhost init.d]# service mysql start
Starting MySQL.                      [  OK  ]
[root@localhost init.d]# /data/mysql/bin/mysql -uroot -p
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 21
Server version: 5.0.88-log Source distribution
No entry for terminal type "xterm";
using dumb terminal settings.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

　　

　　终于解决了！