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Nagios, 2nd Edition by Wolfgang Barth

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7.4 Monitoring Processes

The check_procs plugin monitors processes according to various criteria. Usually it is used to monitor the running processes of just one single program. Here the upper and lower limits can also be specified.

nmbd, for example, the name service of Samba, always runs as a daemon with two processes. A larger number of nmbd entries in the process table is always a sure sign of a problem; it is commonly encountered, especially in older Samba versions.

Services such as Nagios itself should only have one main process. This can be seen by the fact that its parent process has the process ID 1, marking it as a child of the init process. It was often the case, in the development phase of Nagios 2.0, that several such processes were ...

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