Werk #13170: check_dns: added option to use default DNS server

Component Checks & agents
Title check_dns: added option to use default DNS server
Date Oct 27, 2021
Checkmk Editon Checkmk Raw (CRE)
Checkmk Version 2.0.0p14 2.1.0i1
Level Trivial Change
Class New Feature
Compatibility Compatible - no manual interaction needed

If no DNS server is specified the error message "CRITICAL - Plugin timed out while executing system call" could have been reported. The reason for this error is that the check_dns option "-s" is used with the hostname as DNS server. The host might not be a DNS server and a timeout occurs.

The new option "Use default DNS server" will omit the option "-s" for check_dns. In this case the default DNS server of the checkmk server will be used and no timeout occurs any more.

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