Fix postgres StatefulSet crash under readOnlyRootFilesystem#7
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July 2, 2026 08:44
The postgres container sets readOnlyRootFilesystem: true but never mounted a writable volume at /var/run/postgresql, so the official postgres image's entrypoint fails to create its Unix socket lock file on every start: FATAL: could not create lock file "/var/run/postgresql/.s.PGSQL.5432.lock": Read-only file system Add an emptyDir volume mounted at /var/run/postgresql, matching the existing dshm pattern.
lookup-based persistence only works against a live cluster (helm upgrade/install). GitOps controllers that render via `helm template` (ArgoCD, Flux) always get an empty lookup result, so these two secrets were regenerating on every render and forcing a server pod restart via the checksum/secret annotation on every sync — same class of issue as the existing postgres.auth.existingSecret / patchmon.jwt.secret escape hatches, just missing for these two fields.
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The postgres container sets readOnlyRootFilesystem: true but never mounted a writable volume at /var/run/postgresql, so the official postgres image's entrypoint fails to create its Unix socket lock file on every start:
FATAL: could not create lock file
"/var/run/postgresql/.s.PGSQL.5432.lock": Read-only file system
Add an emptyDir volume mounted at /var/run/postgresql, matching the existing dshm pattern.