This document describes the Nagios plugins mainly used to monitor NorduGrid ARC compute elements and related resources, but some probes should also be usable to test non-ARC resources. The package includes three main entry points, some of which have additional sub-commands:
This chapter will describe common configuration and options. The following chapter covers each of the main entry point.
Acknowledgements. This work is co-funded by the EC EMI project under the FP7 Collaborative Projects Grant Agreement Nr. INFSO-RI-261611.
The configuration is merged from a list of the INI-format files, where settings from later files take precedence, and missing files are ignored. By the default the files considered are
/etc/nagios/plugins.ini
/etc/nagios/plugins/arcnagios.ini
/etc/nagios/plugins/arcnagios-local.ini
but this can be overridden by setting the environment variable $ARCNAGIOS_CONFIG to a colon-separated list.
Each probe has a main configuration section, with is named after the probe. In this section you can provide defaults for command-line options. The name of the configuration variable corresponding to an option is obtained by stripping the initial “--” and replacing “-” with “_“, e.g. “--home-dir” becomes “home_dir“.
The following options are common to all probes:
The check_arcce and check_gridstorage probes will require a proxy certificate to succeed. The probes will maintain a proxy when provided a X509 certificate and key. You can place these in a common section:
[gridproxy]
default_voms = <voms>
user_key = <path>
user_cert = <path>
#user_proxy = <path> # Optionally override the path of the generated proxy.
The probes which require an X509 proxy have a --voms=<voms> option to specify the VOMS server to contact instead of default_voms. When a user_key and user_cert pair is given, the default user_proxy path is unique to the selected VOMS.
To use a pre-initialized proxy, make sure user_key and user_cert are not set. You will probably want to use a non-default location for the proxy. Either point to it with the environment variable X509_USER_PROXY or set it in the configuration file:
[gridproxy]
user_proxy = <path>
If you use several VOs with require different certificates, you can replace the above section with one section gridproxy.<voms> per <voms> and use the --voms option to select which section to use. These sections don’t have the default_voms setting.
The configuration file of these probes should not be generated or parts substituted from an untrusted source without proper filtering. In particular the job tests picks up shell code to be executed on cluster nodes from configuration variables, and the ARIS tests uses the Python interpreter to evaluate custom expressions.