[2.2] DNS service monitoring should issue test queries

Bug #1710310 reported by Mike Pontillo on 2017-08-11
This bug affects 1 person
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Bug Description

MAAS currently monitors services by asking the init system what the current status of the service is.

Bug #1710278 describes a case where the bind9 service is up and running from the perspective of the init system, but in reality deadlocked.

MAAS should test the service in a more accurate way: by issuing test queries to the DNS server and validating that the expected response is returned.

For more complete data, MAAS rack controllers should also issue test queries.

description: updated
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