Modified a bit.

check_redis.py

#!/usr/bin/env python

"""
check_redis.py: Nagios plugin for checking a redis server.

Author: Steffen Zieger <me@saz.sh>
License: GPL
Version: 1.0
"""

from optparse import OptionParser
import sys
import socket
import redis

# Constants
EXIT_OK = 0
EXIT_WARN = 1
EXIT_CRIT = 2
EXIT_UNKNOWN = 3


class RedisCheck(object):
    def __init__(self, host, port=6379, password=None, clientsWarn=None,
                 clientsCrit=None, memWarn=None, memCrit=None, upWarn=None,
                 upCrit=None, slavesWarn=None, slavesCrit=None):
        self.status = EXIT_OK
        self.message = False
        self.host = host
        self.port = port
        self.password = password
        self.clientsWarn = clientsWarn
        self.clientsCrit = clientsCrit
        self.slavesWarn = slavesWarn
        self.slavesCrit = slavesCrit
        self.memWarn = float(memWarn)
        self.memCrit = float(memCrit)
        self.upWarn = upWarn
        self.upCrit = upCrit
        self._fetchInfo()

    def _setStatus(self, status):
        """ Set the status only, if new status is not lower than current status"""
  if status > 0:
       	    self.status = status

    def _setMessage(self, message):
        if self.message:
            self.message += ", "
            self.message += message
        else:
            self.message = message

    def _exit(self):
        print self.message + self._getPerfData()
        sys.exit(self.status)

    def _fetchInfo(self):
        try:
            self.info = redis.Redis(host=self.host, port=self.port, password=self.password).info()

        except redis.ConnectionError:
            self._setStatus(EXIT_CRIT)
            self._setMessage("Can't connect to %s:%s" % (self.host, self.port))
            self._exit()


    def getStatus(self):
        return self.status

    def getRole(self):
        return self.info['role']

    def _getPerfData(self):
        "Returns various perf data values for graphs in Nagios"
        return "|role=%s,uptime=%ss;%s;%s,connectedClients=%s;%s;%s," \
                "connectedSlaves=%s;%s;%s,usedMemory=%sMB;%s;%s" % \
                ( self.getRole(),
		 self.getUptime()['s'], self.upWarn, self.upCrit,
                 self.getConnectedClients(), self.clientsWarn,
                 self.clientsCrit, self.getConnectedSlaves(),
                 self.slavesWarn, self.slavesCrit,
                 self.getUsedMem(), self.memWarn, self.memCrit)

    def getUptime(self):
        uptime = int(self.info['uptime_in_seconds'])

        ret = {}
        ret['d'] = uptime / 86400
        ret['h'] = (uptime % 86400) / 3600
        ret['m'] = (uptime % 3600) / 60
        ret['s'] = uptime

        return ret

    def getConnectedClients(self):
        return self.info['connected_clients']

    def getConnectedSlaves(self):
        return self.info['connected_slaves']

    def getUsedMem(self):
        return "%.2f" % float(self.info['used_memory'] / 1024.0 / 1024.0)

    def getLastSave(self):
        return self.info['last_save_time']

    def checkUptime(self):
        uptime = self.getUptime()

        if uptime['s'] < self.upCrit:
            self._setMessage("Uptime is %s seconds" % (uptime['s']))
            self._setStatus(EXIT_CRIT)
        elif uptime['s'] < self.upWarn:
            self._setMessage("Uptime is %s minutes" % (uptime['m']))
            self._setStatus(EXIT_WARN)
        else:
            days = 'days'
            if uptime['d'] == 1:
                days = 'day'
            self._setMessage("Uptime is %s %s, %s:%s h" % (uptime['d'], days,
                                                            uptime['h'],
                                                            uptime['m']))
            self._setStatus(EXIT_OK)

    # If mem reached that amount of RAM warn.
    def checkMemory(self):
        mem = float(self.getUsedMem())
        if mem > self.memCrit:
            ret = EXIT_CRIT
        elif mem > self.memWarn:
            ret = EXIT_WARN
        else:
            ret = EXIT_OK

        self._setStatus(ret)
        self._setMessage("Used Memory: %s MB" % (mem))

    def checkConnectedClients(self):
        clients = self.getConnectedClients()

        if clients > self.clientsCrit:
            ret = EXIT_CRIT
        elif clients > self.clientsWarn:
            ret = EXIT_WARN
        else:
            ret = EXIT_OK

        self._setStatus(ret)
        self._setMessage("Connected Clients: %s" % (clients))

    def checkConnectedSlaves(self):
        slaves = self.getConnectedSlaves()

        if slaves < self.slavesCrit:
            ret = EXIT_CRIT
        elif slaves < self.slavesWarn:
            ret = EXIT_WARN
        else:
            ret = EXIT_OK
        self._setStatus(ret)
        self._setMessage("Connected Slaves: %s" % (slaves)) 

    def checkRole(self):
	role = self.getRole()
        self._setMessage("Role: %s" % role )

	if role == 'slave':
           self._setMessage("MasterHost: %s" % self.info['master_host'])
           self._setMessage("MasterLinkStatus: %s" % self.info['master_link_status'])
           self._setMessage("MasterLastIOSec: %s" % self.info['master_last_io_seconds_ago'])
           self._setMessage("MasterSyncInProgress: %s" % self.info['master_sync_in_progress'])

    def runChecks(self):
	self.checkRole()
        self.checkUptime()
        self.checkMemory()
        self.checkConnectedClients()
        self.checkConnectedSlaves()

    def check(self):
        self.runChecks()
        self._exit()

def get_info(host, port, timeout):
     socket.setdefaulttimeout(timeout or None)
     s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
     s.connect((host, port))
     s.send("*1\r\n$4\r\ninfo\r\n")
     buf = ""
     while '\r\n\r\n' not in buf:
         buf += s.recv(1024)
     s.close()
     return dict(x.split(':', 1) for x in buf.split('\r\n') if ':' in x)

def build_parser():
     parser = OptionParser()
     parser.add_option("-H", "--server", dest="server", help="Redis server to connect to.", default="127.0.0.1")
     parser.add_option("-p", "--port", dest="port", help="Redis port to connect to.", type="int", default=6379)
     parser.add_option("-M", "--critical_memory", dest="crit_memory", help="Memory utilization (in MB) that triggers a critical status.", type="float", default=256)
     parser.add_option("-m", "--warn_memory", dest="warn_memory", help="Memory utilization (in MB) that triggers a warning status.", type="float", default=128)
     parser.add_option("-C", "--critical_client", dest="crit_client", help="Connected Clients that triggers a critical status.", type="int", default=80)
     parser.add_option("-c", "--warn_client", dest="warn_client", help="Connected Clients  that triggers a critical status.", type="int", default=60)
     parser.add_option("-S", "--critical_slave", dest="crit_slave", help="Connected Slave that triggers a critical status.", type="int", default=0)
     parser.add_option("-s", "--warn_slave", dest="warn_slave", help="Connected Slave that triggers a critical status.", type="int", default=0)
     parser.add_option("-t", "--timeout", dest="timeout", help="Number of milliesconds to wait before timing out and considering redis down", type="int", default=2000)
     return parser

def main():
    parser = build_parser()
    options, _args = parser.parse_args()

    try:
       info = get_info(options.server, int(options.port), timeout=options.timeout / 1000.0)
    except socket.error, exc:
       print "CRITICAL: Error connecting or getting INFO from redis %s:%s: %s" % (options.server, options.port, exc)
       sys.exit(EXIT_CRIT)	

    redisCheck = RedisCheck(options.server, memWarn=options.warn_memory, memCrit=options.crit_memory, upWarn=900,
                            upCrit=60, clientsWarn=options.warn_client, clientsCrit=options.crit_client,
                            slavesWarn=options.warn_slave, slavesCrit=options.crit_slave)

    redisCheck.check()

if __name__ == '__main__':
    main()