This plugin checks the remote servers time and compares it against the local time on the Nagios server. With Nagios being sync'ed to NTP, this can identify systems that have no NTP set up, or NTP is wrongly configured. This plugin is particalry helpful if SNMP is already used to monitor the system.

The plugin depends on Perl's Net::SNMP package, i.e. perl-SNMP-

Usage: [-v] -H <host> -C <snmp_community> [-2] | (-l login -x passwd [-X pass -L <authp>,<privp>]) [-p <port>] [-o <tz-offset>] -w <warn level> -c <crit level> [-f] [-t <timeout>] [-V]


-v, --verbose
      print extra debugging information

-h, --help
      print this help message

-H, --hostname=HOST
      name or IP address of host to check

-C, --community=COMMUNITY NAME
      community name for the host's SNMP agent (implies v1 protocol)

-2, --v2c
      Use snmp v2c

-l, --login=LOGIN ; -x, --passwd=PASSWD
      Login and auth password for snmpv3 authentication
      If no priv password exists, implies AuthNoPriv

-X, --privpass=PASSWD
      Priv password for snmpv3 (AuthPriv protocol)

-L, --protocols=<authproto>,<privproto>
      <authproto> : Authentication protocol (md5|sha : default md5)
      <privproto> : Priv protocole (des|aes : default des)

-P, --port=PORT
      SNMP port (Default 161)

-o, --tzoffset=MINS
      the remote systems timezone offset to the Nagios server, in minutes

-w, --warn=INTEGER
      warning level for time difference in seconds

-c, --crit=INTEGER
      critical level for time difference in seconds

-f, --perfparse
      Perfparse compatible output

-t, --timeout=INTEGER
      timeout for SNMP in seconds (Default: 5)

-V, --version
      prints version number

Plugin Definition Example:

Below is an example of the plugin definition in the Nagios command.cfg file.

# nagios plugin
define command{
  command_name check_snmp_time
  command_line $USER1$/ -H $HOSTADDRESS$ -C $ARG1$ -w $ARG2$ -c $ARG3$ -f

Plugin Usage Example:

The plugin with its most basic use.

susie: ~ # cd /srv/app/nagios/libexec
susie: ~ # ./ -H -C NBNro -w 1 -c 20 clock is accurate to the second : OK

The plugin with the -f option, returning additional performance data.

susie: ~ # cd /srv/app/nagios/libexec
susie: ~ # ./ -H -C NBNro -w 1 -c 20 -f clock is accurate to the second : OK | 
local=2010-12-14_19:27:26 remote=2010-12-14_19:27:26 offset=0

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