Container Image Requirements

The CloudNativePG operator for Kubernetes is designed to work with any compatible container image of PostgreSQL that complies with the following requirements:

• PostgreSQL executables that must be in the path:
  • initdb
  • postgres
  • pg_ctl
  • pg_controldata
  • pg_basebackup
• Barman Cloud executables that must be in the path:
  • barman-cloud-backup
  • barman-cloud-backup-delete
  • barman-cloud-backup-list
  • barman-cloud-check-wal-archive
  • barman-cloud-restore
  • barman-cloud-wal-archive
  • barman-cloud-wal-restore
• PGAudit extension installed (optional - only if PGAudit is required in the deployed clusters)
• Appropriate locale settings
• du (optional, for kubectl cnpg status)

No entry point and/or command is required in the image definition, as CloudNativePG overrides it with its instance manager.

The CloudNativePG community provides and supports public PostgreSQL container images that work with CloudNativePG, and publishes them on ghcr.io.

Image Tag Requirements

To ensure the operator makes informed decisions, it must accurately detect the PostgreSQL major version. This detection can occur in two ways:

1. Utilizing the major field of the imageCatalogRef, if defined.
2. Auto-detecting the major version from the image tag of the imageName if not explicitly specified.

For auto-detection to work, the image tag must adhere to a specific format. It should commence with a valid PostgreSQL major version number (e.g., 15.6 or 16), optionally followed by a dot and the patch level.

Following this, the tag can include any character combination valid and accepted in a Docker tag, preceded by a dot, an underscore, or a minus sign.

Examples of accepted image tags:

• 12.1
• 13.3.2.1-1
• 13.4
• 14
• 15.5-10
• 16.0