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UNIX for Advanced & Expert Users
MySQL problem >> missing mysql.sock
Post 28982 by Neo on Friday 27th of September 2002 12:43:51 AM
09-27-2002
Administrator
mysql.sock is required for mysqld processes to operate. For example, if your mysql.sock file exists in /tmp and you decide to delete all the 'temp files' you will have a problem with mysql 
You should make sure you know which directory that the mysql.sock file is created and make sure the mysqld processes have permission to write to that directory... and make sure that prior mysql.sock files are either deleted or have correct permissions so when another process is started it can overwrite this file.
For example:
Notice that the mysql.sock file is in /tmp and the permission are root.root because mysql is running as root.root. If you are not running mysql as root, then you could have problems writing if another mysql.sock file exists, etc.
My advise is to find out where your system is writing this file, shutdown mysql, delete all the old mysql.sock files, check permissions and restart.
You should make sure you know which directory that the mysql.sock file is created and make sure the mysqld processes have permission to write to that directory... and make sure that prior mysql.sock files are either deleted or have correct permissions so when another process is started it can overwrite this file.
For example:
Quote:
server# cd /tmp
server# ll *sock*
srwxrwxrwx 1 root root 0 Aug 10 00:14 mysql.sock=
server#
server# ll *sock*
srwxrwxrwx 1 root root 0 Aug 10 00:14 mysql.sock=
server#
My advise is to find out where your system is writing this file, shutdown mysql, delete all the old mysql.sock files, check permissions and restart.
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LEARN ABOUT CENTOS
pmdamysql
PMDAMYSQL(1) Performance Co-Pilot PMDAMYSQL(1) NAME
pmdamysql - MySQL database PMDA DESCRIPTION
pmdamysql is a Performance Co-Pilot PMDA which extracts live performance data from a running MySQL database. INSTALLATION
pmdamysql uses a configuration file from (in this order): o /etc/pcpdbi.conf o $PCP_PMDAS_DIR/mysql/mysql.conf This file can contain overridden values (Perl code) for the settings listed at the start of pmdamysql.pl, namely: o database name (see DBI(3) for details) o database user name o database pass word Once this is setup, you can access the names and values for the mysql performance metrics by doing the following as root: # cd $PCP_PMDAS_DIR/mysql # ./Install If you want to undo the installation, do the following as root: # cd $PCP_PMDAS_DIR/mysql # ./Remove pmdamysql is launched by pmcd(1) and should never be executed directly. The Install and Remove scripts notify pmcd(1) when the agent is installed or removed. Binary Status values in text Some of the status values are in the form of YES/NO or ON/OFF. Since these cannot be intepreted by tools like PMIE, they have been duplicated with a _num extension and the values of 1 (YES/ON) or 0 (NO/OFF). Eg: o mysql.slave_status.slave_io_running o mysql.slave_status.slave_io_running_num FILES
/etc/pcpdbi.conf configuration file for all PCP database monitors $PCP_PMDAS_DIR/mysql/mysql.conf configuration file for pmdamysql $PCP_PMDAS_DIR/mysql/Install installation script for the pmdamysql agent $PCP_PMDAS_DIR/mysql/Remove undo installation script for the pmdamysql agent $PCP_LOG_DIR/pmcd/mysql.log default log file for error messages from pmdamysql SEE ALSO
pmcd(1), pmdadbping.pl(1) and DBI(3). # vi: sw=4 ts=4 et: 3.8.10 Performance Co-Pilot PMDAMYSQL(1)