Q. How do I find out if my MySQL server is running or not under Linux / UNIX operating systems?

A. You can use mysql startup script or mysqladmin command to find out if it is running on Linux. Then you can use ps command and telnet command too (it is not reliable but it works.). mysqladmin is a utility for performing administrative operations. You can also use shell script to monitor MySQL server. You can use mysqladmin as follows:
Code:
# mysqladmin -u root -p status
Output:
Enter password: Uptime: 4 Threads: 1 Questions: 62 Slow queries: 0 Opens: 51 Flush tables: 1 Open tables: 45 Queries per second avg: 15.500 If MySQL serer is running it will display output as above. It displays uptime and number of queries etc. If server is not running then it will dump error as follows
Code:
# mysqladmin -u root -p status
Output:
mysqladmin: connect to server at 'localhost' failed error: 'Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)' Check that mysqld is running and that the socket: '/var/run/mysqld/mysqld.sock' exists! Under Debian Linux you can type following command to find out if MySQL server is running or not
Code:
# /etc/init.d/mysql status
Output:
/usr/bin/mysqladmin Ver 8.41 Distrib 4.1.15, for pc-linux-gnu on i486 Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB This software comes with ABSOLUTELY NO WARRANTY. This is free software, and you are welcome to modify and redistribute it under the GPL license Server version 4.1.15-Debian_1-log Protocol version 10 Connection Localhost via UNIX socket UNIX socket /var/run/mysqld/mysqld.sock Uptime: 4 min 16 sec Threads: 1 Questions: 66 Slow queries: 0 Opens: 51 Flush tables: 1 Open tables: 45 Queries per second avg: 0.258 If you are using RedHat of Fedora then you can use following script"
Code:
# service mysqld status
OR
Code:
# /etc/init.d/mysqld status