Is there option to connect to external database cluster from POD? I need to connect to elastic search, zookeeeper, Kafka and couchbase, each of them has its own cluster. Per my understanding the documentation, I can define multi external IPs, but I cannot find how will k8s behave if one of them is down. I am working with pure k8s 1.6 now, and we will migrate to 1.7 soon. Information about OpenShift 3.7 will be also welcome because I cannot find anything specific in its documentation.
The k8s doc on your link has more info on exposing services running on k8s but not externally
You generally want to expose your service using a DNS entry and manage the HA for that service separately.
For example you can a single DNS entry mykafka.mydomain.com and then assign IP addresses to that entry:
kafka1 ip
kafka2 ip
kafka3 ipYou can see that approach on the Openshift docs in the USING AN EXTERNAL DOMAIN NAME section. Yes, its not clear from the docs whether k8s/openshift does a round robin on the multiple IPs for an external service and if automatically fails over.
Hope it helps.