The Ultimate Guide to High Availability with MariaDB

mysql_zap

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mysql_zap kills processes that match a pattern. It uses the ps command and Unix signals, so it runs on Unix and Unix-like systems.

Invoke mysql_zap

shell> mysql_zap [-signal] [-?Ift]

A process matches if its output line from the ps command contains the pattern. By default, mysql_zap asks for confirmation for each process. Respond y to kill the process, or q to exit mysql_zap. For any other response, mysql_zap does not attempt to kill the process.

If the -signal option is given, it specifies the name or number of the signal to send to each process. Otherwise, mysql_zap tries first with TERM (signal 15) and then with KILL (signal 9).

mysql_zap supports the following additional options:

  • --help, -?, -I
    • Display a help message and exit.
  • -f
    • Force mode. mysql_zap attempts to kill each process without confirmation.
  • -t
    • Test mode. Display information about each process but do not kill it. 
Example:
localhost:~# mysql_zap -t mysql
stty: standard input: unable to perform all requested operations
USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
root      4073  0.0  0.2   3804  1308 ?        S    08:51   0:00 /bin/bash /usr/bin/mysqld_safe
mysql     4258  3.3 15.7 939740 81236 ?        Sl   08:51  30:18 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --user=mysql --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/run/mysqld/mysqld.sock --port=3306

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