2.2.6 Improving the in.named Methods

Consider some possible improvements to the start_net and stop_net methods for HA-in.named. The methods can benefit from better error detection and handling. For example, you can test whether the /usr/sbin/in.named binary exists, is executable, and is non-empty. If not, an error message can be logged. Before attempting to cat(1) the file hainnamed.config, verify that the file exists, exhibits the correct permissions, and is non-empty.

The methods also can test for the existence of the non-HA in.named data file /etc/named.boot. If the file exists, there is confusion about whether this host is running non-HA in.named or HA-in.named; only one can run at a time. The code can treat this case as a severe configuration error, log appropriate messages, and neither start nor kill in.named.