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Prevents NFS-lock races during rolling updates. The hostPath PVs point at
an NFS-shared directory mounted on every r-node, so RWO is not actually
enforced across nodes — under the default RollingUpdate strategy the new
pod can start on a different node and grab the same data dir while the
old pod still holds file locks, producing errors like postgres'
"could not write to file postmaster.pid: Unknown error 512".
Applied to: immich-postgres, audiobookshelf, anki-sync-server, registry,
pkgrepo, player, wallabag, miniflux-postgres, opodsync, radicale,
kobo-sync-server, keybr, filebrowser, git-server, goprecords, jellyfin.
(syncthing and navidrome already had it.)
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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