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due to the ongoing v6 problems we realized that grenache-1 workers disappear one by one if there is no working ipv6 connectivity. This currently results in many blocked jobs since grenache-1 is our main jump host for more exotic testing environments. This ticket is mainly a tracker on what I did to make the workers appear in OSD again:

• 20.10.2020: problem was realized by workers not connecting to baremetal-support.qa.suse.de
• 20.10.2020: IPv6 route was missing, created https://infra.nue.suse.com/SelfService/Display.html?id=178626
• 20.10.2020: IPv6 route was manually added with ip -6 r a fe80::1, after that the worker appeared on all webui's again
• 21.10.2020: Due to severe performance problems with the workers we decided to remove the v6 route again (details: https://progress.opensuse.org/issues/73633?issue_count=67&issue_position=1&next_issue_id=73501#note-2)
• 22.10.2020: Several reports stated that grenache-1 workers are once again unavailable. Things I did:
  • Stopped all openqa-worker instances
  • umount /var/lib/openqa/share since it was connected over v6
  • disable v6 completely on the external interface with echo 1 > /proc/sys/net/ipv6/conf/eth0/disable_ipv6
  • mount /var/lib/openqa/share && systemctl start openqa-worker@{1..40}
  • ==> workers came back on OSD. First jobs are running. Reducing priority for now :)