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There were three other plugins in the package. These are utility plugins that can invert a response or check if the response falls within a range. To check how the check_http plugin works run it with the --help flag. An example of this can be found in Appendix A of this article. From the The help output we can determine that in order to check an SSL certificate expiration date we should run it states check_http should be run with the -C flag . Notice this statement in the help output:in order to check SSL certificate status.
-C <warn_age>[,<crit_age>]
So with With a command such as:
[root@opmantek ~]# /usr/lib64/nagios/plugins/check_http -I demo.opmantek.com -C 30, 15
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| Code Block | ||
|---|---|---|
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[root@opmantek ~]# /usr/lib64/nagios/plugins/check_http -I demo.opmantek.com -C 30, 15 OK - Certificate '*.opmantek.com' will expire on 2017-11-16 15:16 +0900/KST. |
Observe that the -C flag will will check the certificates expiration date and provide a warning if it's less that 30 days away.
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Via the top menu bar navigate to System -> System Configuration > NMIS Nodes. A new 'NMIS Nodes' window will render. For this example we will assign the checkDemoCert to the node localhost. Find the node localhost and click 'edit' on the right hand side. A new window will render. Find the Advanced Options Section. Creatively using the shift and mouse left clicker, select the service checkdemocert, careful not to de-select any other provisioned servcies, indeed a feat in mouse prowess and dexterity.
At the bottom of the window click the 'Edit and Update Node' button. After some processing time a new window will render with debug detail of the update process. Feel free to close this window.
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