Skip to content

pgcat pods running on k8s dropping connections while rollout #939

Description

@asaray11

Is your feature request related to a problem? Please describe.
I use pgcat pods for my Postgresql connection pooler in k8s. I deployed pgcat with helm using this repo. Since autoreloader not working correctly in k8s, I run 2 replicas of pgcat. Thus service will not be interrupted in case of config changes. But when I make tests I saw connection problems occurred during rollout of pods.

This is test query:
root@psql-client:/# PGPASSWORD=xxx bash -c 'while true; do echo -n "$(date "+%H:%M:%S") -> "; if ! psql -h pgcat-helm.pgcat.svc.cluster.local -p 6432 -U xxx -d xxx-t -c "SELECT now();" >/dev/null 2>&1; then echo "Connection error!"; else echo "OK"; fi; sleep 0.1; done'

When I run this test and make a rollout it gives connection error;
05:55:04 -> OK
05:55:04 -> OK
05:55:04 -> Connection error!
05:55:04 -> OK
05:55:05 -> OK

Describe the solution you'd like
I forked repo and changed deployment.yaml and added "initialDelaySeconds: 5" then it worked without error.

      livenessProbe:
        tcpSocket:
          port: pgcat
        initialDelaySeconds: 5
      readinessProbe:
        tcpSocket:
          port: pgcat
        initialDelaySeconds: 5

Describe alternatives you've considered
I will be glad to hear if anybody can run pgcat autoreloader in k8s.

Activity

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment

Metadata

Metadata

Assignees

No one assigned

    Labels

    No labels
    No labels

    Type

    No type

    Projects

    No projects

      Milestone

      No milestone

      Relationships

      None yet

      Development

      No branches or pull requests

      Issue actions