Improve the logging output for the init container during Redis-HA startup.
Implement additional DNS lookup to make sure the detected master instance is still valid.
Additional: Implement support for building a Redis HA cluster using FQDN DNS names instead of IP addresses.
Background:
When a master instance is terminated the Redis HA cluster still assumes the instance is a valid master - it takes time for the cluster to find out that a cluster instance is down (see downAfterMilliseconds:). The DNS lookup adds an additonal "safety layer". When the DNS lookup fails the init will wait (see failoverWait:) until another attempt to detect the master is tried. If second attempt fails again, a failover will be manually forced.
Improve the logging output for the init container during Redis-HA startup. Implement additional DNS lookup to make sure the detected master instance is still valid.
Additional: Implement support for building a Redis HA cluster using FQDN DNS names instead of IP addresses.
Background:
When a master instance is terminated the Redis HA cluster still assumes the instance is a valid master - it takes time for the cluster to find out that a cluster instance is down (see
downAfterMilliseconds:). The DNS lookup adds an additonal "safety layer". When the DNS lookup fails the init will wait (seefailoverWait:) until another attempt to detect the master is tried. If second attempt fails again, a failover will be manually forced.