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Varnish NRPE

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Overview​

The Monitoring Connector Varnish works with the Centreon NSClient++ monitoring agent on Windows and NRPE Server on Linux to check the performance and behavior of a Varnish HTTP Cache Server.

Pack assets​

Monitored objects​

  • Varnish Cache statistics

Collected metrics​

Coming soon

Prerequisites​

Command-line utility​

The Plugin uses the varnishstat binary.

NRPE Server​

On RPM-Based distribution, you can use the centreon-nrpe3-daemon package deploying a preconfigured version of the NRPE Server.

Most of the Linux distributions provide a NRPE package you can deploy using the system package default manager. When using these, it's important to modify following directives in the config files:

  • allowed_hosts
[...]
# ALLOWED HOST ADDRESSES
# This is an optional comma-delimited list of IP address or hostnames
# that are allowed to talk to the NRPE daemon. Network addresses with a bit mask
# (i.e. 192.168.1.0/24) are also supported. Hostname wildcards are not currently
# supported.
allowed_hosts=X.X.X.X,X.Y.Z.V
[...]
  • dont_blame_nrpe
[...]
# ALLOWED HOST ADDRESSES
# This is an optional comma-delimited list of IP address or hostnames
# that are allowed to talk to the NRPE daemon. Network addresses with a bit mask
# (i.e. 192.168.1.0/24) are also supported. Hostname wildcards are not currently
# supported.
dont_blame_nrpe=1
[...]

Important note: the NASTY_METACHARS parameter should be left as its default value. Modifying it might open serious security hole and RCE exploitation from an attacker.

Installation​

  1. Install the Centreon NRPE Client package on every Poller expected to monitor Varnish:
yum install centreon-nrpe3-plugin
  1. On the Centreon Web interface, install the Centreon Pack Varnish from the Configuration > Monitoring Connector Manager page

Host configuration​

  • Log into Centreon and add a new Host through "Configuration > Hosts".
  • Apply the App-Varnish-NRPE-custom template and configure all the mandatory Macros:
MandatoryNameDescription
XNRPECLIENTNRPE Plugin binary to use (Default: 'check_centreon_nrpe')
XNRPEPORTNRPE Port of the target server (Default: '5666')
XNRPETIMEOUTTimeout value (Default: '30')
XNRPEEXTRAOPTIONSExtraoptions to use with the NRPE binary (default: '-u -m 8192')