kubernetes.md

Kubernetes

Common errors

adding IPv6 rule: ...: file exists

This is caused by two factors:

1. Kubernetes shares IP rules across the entire pod even if multiple Gluetun containers are running in the same pod
2. Abrupt Gluetun exits which can be caused by a node shutdown, power event or just Gluetun hanging at shutdown (I'm working on fixing this)

To resolve this, change the update strategy from RollingUpdate to Recreate strategy AND add post start command to ensure IP rules are deleted, for example for Wireguard:

apiVersion: apps/v1
kind: Deployment
spec:
  strategy:
    type: Recreate
    spec:
      containers:
        - name: vpn
          image: qmcgaw/gluetun
          lifecycle:
            postStart:
              exec:
                command: ["/bin/sh", "-c", "(ip rule del table 51820; ip -6 rule del table 51820) || true"]
          # ...

Credits to @kvangent

See the original issue #2521 comment which resolved this