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Check MySQL Replication Slave Status

Last Update: January 06, 2014

Download check_mysql_slavestatus.sh check_mysql_slavestatus

I programmed this script, to check the status of the MySQL replication. It is based on the plugin 'check mysql slave sql running' by dhirajt found on MonitoringExchange. It is written in bash, so it is portable on all kind of Linux and Unix systems.

Version History
2008041700 Original Script modified
2008041701 Added additional info if status OK
2008041702 Added usage of script with params -H -u -p
2008041703 Added bindir variable for multiple platforms
2008041704 Added help because mankind needs help
2008093000 Using /bin/sh instead of /bin/bash (Victor Balada Diaz)
2008093001 Added port for MySQL server (Victor Balada Diaz)
2008093002 Added mysqldir if mysql binary is elsewhere (Victor Balada Diaz)
2008101501 Changed bindir/mysqldir to use PATH (Soren Klintrup)
2008101501 Use $() instead of `` to avoid forks (Soren Klintrup)
2008101501 Use ${} for variables to prevent problems (Soren Klintrup)
2008101501 Check if required commands exist (Soren Klintrup)
2008101501 Check if mysql connection works (Soren Klintrup)
2008101501 Exit with unknown status at script end (Soren Klintrup)
2008101501 Also display help if no option is given (Soren Klintrup)
2008101501 Add warning/critical check to delay (Soren Klintrup)
2011062200 Add perfdata (Philippe Barsalou)
2011122700 Checking Slave_IO_Running (Marc Feret)
2012080300 Changed to use only one mysql query (Peter Lecki)
2012080301 Added warn and crit delay as optional args (Peter Lecki)
2012080302 Added standard -h option for syntax help (Peter Lecki)
2012080303 Added check for mandatory options passed in (Peter Lecki)
2012080304 Added error output from mysql (Peter Lecki)
2012080305 Changed from 'cut' to 'awk' (eliminate ws) (Peter Lecki)
2012111600 Do not show password in error output
2013042800 Changed PATH to use existing PATH, too
2013050800 Bugfix in PATH export
2013092700 Bugfix in PATH export
2013092701 Bugfix in getopts
2013101600 Rewrite of threshold logic and handling
2013101601 Optical clean up
2013101602 Rewrite help output
2013101700 Handle Slave IO in 'Connecting' state
2013101701 Minor changes in output, handling UNKWNON situations now
2013101702 Exit CRITICAL when Slave IO in Connecting state
2013123000 Slave_SQL_Running also matched Slave_SQL_Running_State

Thanks to everyone who helped making this plugin better!

Definition of the parameters:

-H Hostname or IP address of server to check
-P Port of MySQL server (standard is 3306)
-u Username of user who has rights on the MySQL server
-p Password of the user declared with -u parameter
-w Warning delay of slave behind master (in seconds)
-c Critical delay of slave behind master (in seconds)
--help Help text for correct use of this script



Before you use the script, check the following variable. The 'grep', 'cut' and 'mysql' binaries have to be in one of those PATH locations. If they are located in another directory, feel free to add its directory to the PATH variable.

export PATH=$PATH:/usr/local/bin:/usr/bin:/bin # Set path

Furthermore the MySQL user you want to use for this plugin needs REPLICATION CLIENT privileges. Here is an example how to grant the necessary privileges to a user nagios:



Command definition in your commands.cfg:

# 'check_mysql_slavestatus' command definition
define command{
command_name check_mysql_slavestatus
command_line $USER1$/check_mysql_slavestatus.sh -H $HOSTADDRESS$ -P $ARG1$ -u $ARG2$ -p $ARG3$

# 'check_mysql_slavestatus' command definition with delay check
define command{
command_name check_mysql_slavestatus
command_line $USER1$/check_mysql_slavestatus.sh -H $HOSTADDRESS$ -P $ARG1$ -u $ARG2$ -p $ARG3$ -w $ARG4$ -c $ARG5$


Service check definition:

# check MySQL Slave Status
define service{
use generic-service ; Name of service template to use
host_name mysqlslaveserver
service_description MySQL Replication Status
check_command check_mysql_slavestatus!portnumber!username!passwd

# check MySQL Slave Delay
define service{
use generic-service ; Name of service template to use
host_name mysqlslaveserver
service_description MySQL Replication Delay
check_command check_mysql_slavestatus!portnumber!username!passwd!300!600


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