K8SPSMDB-925: Use ClusterIP as host for internal mongos client

[inelpandzic]

CHANGE DESCRIPTION

Problem: If mongos is exposed as LoadBalancer, we use LB ingress address to for mongos client used by the operator. This works for GKE but on EKS it does not work since the operator can't reach ingress address.

Solution: When creating mongos client used by the operator we should use the ClusterIP address rather than ingress address. Not only this fixes the issue on EKS but it is overall better since there is no need for the operator to go through LB to connect to the host.

CHECKLIST

Jira

• [x] Is the Jira ticket created and referenced properly?
• [x] Does the Jira ticket have the proper statuses for documentation (Needs Doc) and QA (Needs QA)?
• [x] Does the Jira ticket link to the proper milestone (Fix Version field)?

Tests

• [x] Is an E2E test/test case added for the new feature/change?
• [x] Are unit tests added where appropriate?
• [x] Are OpenShift compare files changed for E2E tests (compare/*-oc.yml)?

Config/Logging/Testability

• [x] Are all needed new/changed options added to default YAML files?
• [x] Did we add proper logging messages for operator actions?
• [x] Did we ensure compatibility with the previous version or cluster upgrade process?
• [x] Does the change support oldest and newest supported MongoDB version?
• [x] Does the change support oldest and newest supported Kubernetes version?

[JNKPercona]

Test name	Status
arbiter	passed
balancer	passed
custom-replset-name	passed
custom-tls	passed
cross-site-sharded	passed
data-at-rest-encryption	passed
data-sharded	passed
demand-backup	passed
demand-backup-eks-credentials	passed
demand-backup-physical	passed
demand-backup-physical-sharded	passed
demand-backup-sharded	passed
expose-sharded	passed
ignore-labels-annotations	passed
init-deploy	passed
finalizer	passed
ldap	passed
ldap-tls	passed
limits	passed
liveness	passed
mongod-major-upgrade	passed
mongod-major-upgrade-sharded	passed
monitoring-2-0	passed
multi-cluster-service	passed
non-voting	passed
one-pod	passed
operator-self-healing-chaos	passed
pitr	passed
pitr-sharded	passed
pitr-physical	passed
pvc-resize	passed
recover-no-primary	passed
rs-shard-migration	passed
scaling	passed
scheduled-backup	passed
security-context	passed
self-healing-chaos	passed
service-per-pod	passed
serviceless-external-nodes	passed
smart-update	passed
split-horizon	passed
storage	passed
tls-issue-cert-manager	passed
upgrade	passed
upgrade-consistency	passed
upgrade-consistency-sharded-tls	passed
upgrade-sharded	passed
users	passed
version-service	passed
We run 49 out of 49

commit: https://github.com/percona/percona-server-mongodb-operator/pull/1600/commits/4daab06b0e02880154fc907172072c6cb6053041 image: perconalab/percona-server-mongodb-operator:PR-1600-4daab06b