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Add a plugin to check if Redis is up and running.
This script come from this Git repository https://github.com/mabitt/mab-nagios-plugins
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‎check_redis.sh‎

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#!/usr/bin/env sh
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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PROGNAME=$(basename $0)
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VERSION='Version 0.1.0'
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AUTHOR='MAB ([email protected]), Based on Mike Adolphs (http://www.matejunkie.com/) check_nginx.sh code'
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hostname='127.0.0.1'
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port=6379
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output_dir='/tmp'
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secure=0
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print_version() {
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echo "$VERSION $AUTHOR"
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}
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print_help() {
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print_version $PROGNAME $VERSION
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echo ""
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echo "$PROGNAME is a Nagios plugin to check redis. (http://redis.io)"
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echo "It also parses the redis info output to get used memory, changes "
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echo "current connections, etc..."
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echo ""
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echo "$PROGNAME -H localhost -P 6379 -o /tmp [-w INT] [-c INT]"
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echo ""
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echo "Options:"
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echo " -H/--hostname)"
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echo " Defines the hostname. Default is: localhost"
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echo " -P/--port)"
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echo " Defines the port. Default is: 80"
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echo " -p/--password)"
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echo " Name of the server's status page defined in the location"
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echo " directive of your nginx configuration. Default is:"
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echo " -o/--output-directory)"
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echo " Specifies where to write the tmp-file that the check creates."
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echo " Default is: /tmp"
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echo " -w/--warning)"
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echo " Sets a warning level for used_memory. Default is: off"
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echo " -c/--critical)"
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echo " Sets a critical level for used_memory. Default is:"
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echo " off"
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exit 3
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}
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while test -n "$1"; do
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case "$1" in
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-help|-h)
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print_help
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exit 3
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;;
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--version|-v)
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print_version $PROGNAME $VERSION
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exit 3
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;;
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--hostname|-H)
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hostname=$2
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shift
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;;
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--port|-P)
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port=$2
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shift
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;;
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--password|-p)
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secure=1
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password=$2
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;;
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--output-directory|-o)
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output_dir=$2
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shift
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;;
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--warning|-w)
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warning=$2
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shift
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;;
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--critical|-c)
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critical=$2
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shift
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;;
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*)
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echo "Unknown argument: $1"
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print_help
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exit 3
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;;
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esac
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shift
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done
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get_wcdiff() {
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if [ ! -z "$warning" -a ! -z "$critical" ]
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then
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wclvls=1
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if [ ${warning} -gt ${critical} ]
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then
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wcdiff=1
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fi
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elif [ ! -z "$warning" -a -z "$critical" ]
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then
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wcdiff=2
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elif [ -z "$warning" -a ! -z "$critical" ]
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then
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wcdiff=3
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fi
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}
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val_wcdiff() {
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if [ "$wcdiff" = 1 ]
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then
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echo "Please adjust your warning/critical thresholds. The warning must be lower than the critical level!"
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exit 3
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elif [ "$wcdiff" = 2 ]
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then
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echo "Please also set a critical value when you want to use warning/critical thresholds!"
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exit 3
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elif [ "$wcdiff" = 3 ]
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then
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echo "Please also set a warning value when you want to use warning/critical thresholds!"
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exit 3
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fi
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}
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check_pid() {
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if [ -f "$path_pid/$name_pid" ]
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then
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retval=0
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else
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retval=1
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fi
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}
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get_status() {
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filename=${output_dir}/${PROGNAME}-${hostname}.1
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if [ "$secure" = 1 ]
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then
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redis-cli -h $hostname -p $port -a $password info > ${filename}
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else
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redis-cli -h $hostname -p $port info > ${filename}
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fi
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}
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get_vals() {
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used_memory=$(grep used_memory ${filename} | grep -v human | awk -F: '{print $2}' | tr -d '\r')
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used_memory_human=$(grep used_memory_human ${filename} | awk -F: '{print $2}' | tr -d '\r')
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changes_since_last_save=$(grep changes_since_last_save ${filename} | awk -F: '{print $2}' | tr -d '\r')
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connected_clients=$(grep connected_clients ${filename} | awk -F: '{print $2}' | tr -d '\r')
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connected_slaves=$(grep connected_slaves ${filename} | awk -F: '{print $2}' | tr -d '\r')
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uptime_in_days=$(grep uptime_in_days ${filename} | awk -F: '{print $2}' | tr -d '\r')
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db0keys=$(grep db0 ${output_dir}/$PROGNAME-${hostname}.1 | awk -F, '{print $1}' | awk -F= '{print $2}' | tr -d '\r')
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db0expires=$(grep db0 ${output_dir}/$PROGNAME-${hostname}.1 | awk -F, '{print $2}' | awk -F= '{print $2}' | tr -d '\r')
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rm -f ${filename}
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}
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do_output() {
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output="Redis is using \
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$used_memory_human of RAM; \
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$uptime_in_days days up; \
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$changes_since_last_save Changes; \
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$connected_clients Clients; \
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$connected_slaves Slaves; \
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DB0 ($db0keys keys $db0expires expires)"
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}
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do_perfdata() {
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perfdata="'Memory'=$used_memory_human 'Clients'=$connected_clients 'DB0.keys'=$db0keys"
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}
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# Here we go!
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get_wcdiff
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val_wcdiff
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get_status
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if [ ! -s "$filename" ]; then
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echo "CRITICAL - Could not connect to server"
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exit 2
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else
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get_vals
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if [ -z "$used_memory_human" ]; then
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echo "CRITICAL - Error parsing server output"
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exit 2
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else
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do_output
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do_perfdata
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fi
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fi
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if [ -n "$warning" -a -n "$critical" ]
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then
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if [ "$used_memory" -ge "$warning" -a "$used_memory" -lt "$critical" ]
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then
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echo "WARNING - ${output} | ${perfdata}"
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exit 2
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elif [ "$used_memory" -ge "$critical" ]
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then
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echo "CRITICAL - ${output} | ${perfdata}"
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exit 2
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else
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echo "OK - ${output} | ${perfdata}"
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exit 0
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fi
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else
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echo "OK - ${output} | ${perfdata}"
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exit 0
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fi

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