$ show CrunchyData/postgres-operator
PGO (Crunchy Data Postgres Operator) is a production-grade Kubernetes operator that manages the full lifecycle of PostgreSQL clusters, including deployment, high availability via Patroni, backup/restore via pgBackRest, connection pooling via PgBouncer, monitoring via OpenTelemetry and pgMonitor, and a web UI via pgAdmin. The operator uses custom resource definitions (CRDs) for PostgresCluster, PGAdmin, and PGUpgrade, and reconciles desired state using controller-runtime with server-side apply. It manages StatefulSets, PVCs, Services, ConfigMaps, Secrets, Jobs, and RBAC across multiple namespaces. Architecturally, the operator is a single binary with multiple controllers (postgrescluster, standalone_pgadmin, pgupgrade) and sidecar containers for pgBackRest, PgBouncer, pgAdmin, and the OpenTelemetry collector. It uses feature gates to enable optional capabilities like volume snapshots, auto-grow volumes, and OpenTelemetry logging/metrics. The codebase is well-structured with distinct packages for naming conventions, PKI certificate management, PostgreSQL parameter management, and shell command construction. Extensive unit and e2e tests (using kuttl and chainsaw) cover most scenarios, including backup/restore, scaling, upgrades, and security contexts. Key external dependencies include controller-runtime, client-go, Patroni, pgBackRest, PgBouncer, pgAdmin, OpenTelemetry SDK, and pg_query_go for SQL parsing. The operator is deployed via Kustomize and supports multiple PostgreSQL versions (11-18) with PostGIS extensions.
The LLM identified 4 files worth highlighting for reuse:
Implements a generic `Apply` function that uses Kubernetes server-side apply with force ownership. It includes a fallback to JSON patch for fields that cannot be applied via server-side apply (e.g., service selectors). This pattern is self-contained and can be extracted for any controller that needs idempotent resource creation/update. The code handles ownership conflicts, resource version tracking, and error wrapping.
Provides POSIX-compliant shell word quoting to safely construct command lines for execution in containers. It handles special characters, single quotes, and double quotes correctly, preventing shell injection. This is a standalone utility that can be reused in any Go project that needs to generate shell commands securely.
Implements a complete PKI subsystem for generating root Certificate Authorities and leaf certificates using ECDSA keys (P-256) for FIPS compliance. Includes support for custom subject fields, IP SANs, DNS SANs, and certificate serialization. The code is self-contained with no external PKI dependencies and can be extracted for any Go service needing internal certificate management.
Custom test comparison utilities that provide `MarshalMatches` and `MarshalContains` functions for comparing structured objects with clear multi-line diffs. These helpers simplify test assertions for Kubernetes resources and configuration objects. The package is small, has no external dependencies beyond standard testing, and can be reused in any Go project for better test output.