NRPE allows monitoring tools like NAGIOS or ICINGA to connect to clients for monitoring purposes.
`cd_nrpe` is a fully parameterized Puppet module to automate NRPE installation and configuration.
### WARNING
`**__!!! Attention: Never use this puppet module on systems which have been previously configured manually. It is impossible to predict how and what would have been configured, hence previuos configurations outside the scope of this module may be overwritten! Automated configurations require a test environment to verify that the module suits the purpose intended by the user, as well as tune the parameters, before deploying into live production!!! __**`
* [cd_firewall](https://gitlab.puppetsoft.com/12WW1160/cd_firewall) or [puppetlabs firewall](https://github.com/puppetlabs/puppetlabs-firewall) to manage iptables
* [cd_stdlib](https://gitlab.puppetsoft.com/12WW1160/cd_stdlib) or [puppetlabs stdlib](https://github.com/puppetlabs/puppetlabs-stdlib) to facilitate concat
* [cd_concat](https://gitlab.puppetsoft.com/12WW1160/cd_stdlib) or [puppetlabs concat](https://github.com/puppetlabs/puppetlabs-concat) for concatenating files
`cd_nrpe` does typically not need to be specifically declared. It will be auto-required by `cd_nagios` with default settings. Only if you want to override settings declare it specifically.
In order to apply parameters through Foreman, **__cd_nrpe::params__** must be added to the host or hostgroup in question, unless the defaults are fully acceptable across the estate.
The following parameters are editable via params.pp or through ENC (**__recommended__**). Values changed will take immediate effect at next puppet run. Services will be restarted where neccessary. If you want to override parameters, the [module must be specifically declared to hosts when using ENC](#through-foreman).
*`$ne_manage_cmds` : Whether to manage check command definitions dynamically through a define, i.e. from other Puppet modules or profiles. Defaults to `true`.
*`$ne_incl_fw` : Whether to manage relevant firewall rules through this modules. Defaults to `true`.
*`$ne_include_selinux` : Whether to manage selinux exception rules. Defaults to `true`.
*`$ne_enable_ssl` : Whether to allow SSL settings. See [known problems](#konwn-problems) for more details.
In order to connect a Nagios monitoring server to clients through NRPE, you must define commands and the desired argument strings on the clients. The default NRPE installation comes with a few examples of such commands, which are also included in this module. However, every environment is very different in their requirements and Nagios via Puppet is all about the ability to dynamicically set command arguments based on default variables / overrides. For that reason no hard-coded commands are included, but instead all commands are set via argument strings, where possible.
It is very recommendable to define such commands within Puppet modules controlling services, so any node running the particular service will automatically get the required check commands defined as well, while nodes not running the service also do not contain the command check.
* SSL/TLS support: Version 3 of NRPE supposedly has support for SSL/ TLs. However, at the time of writing this module, this seems to be buggy, as I was unable to start the NRPE service as soon as the `ssl_cert_file` line was uncommented in teh configuration file, despite having valid certs in the right position on the node. This happened when installing manually, not through this Puppet module. For that reason I included the `$ne_enable_ssl` boolean parameter, which is set to `false` by default, hence disabling SSL/TLS options until this has been fixed upstream, or a valid workaround has been found. Setting this option to `true` will include all SSL / TLS settings.
*`--no-class_inherits_from_params_class-check`:relavant only to non-supported outdated puppet versions
*`--no-variable_scope-check`: not applicable as we are inheriting parameters from params class. the lint check does not distinguish between facts and inherited parameters.
*`--no-80chars-check`: it is not always possible to stay within 80 characters, although typically only occurring on the parameter vault `params.pp`.
*`--no-arrow_alignment-check`: this check leads to actually not having am easily readable arrow alignment, as this checks `per block`, not per class.
* Puppet Parser
* ERB Template Parser
* Test for unwanted UTF8 files in the Puppet code as this causes problems with PuppetDB (see tests/UTF_Files)
### Contact Us
[contact Us](https://confdroid.com/contact/)
### Disclaimer
ConfDroid as entity is entirely independent from Puppet. We provide custom configuration modules, written for specific purposes and specific environments.
The modules are tested and supported only as documented, and require testing in designated environments (i.e. lab or development environments) for parameter tuning etc. before deploying into production environments.
