Zero-Downtime PostgreSQL Major Version Upgrades in Containers: The Problem Nobody Talks About

Short summary

PostgreSQL major version upgrades in containers pose unique challenges because containerized environments can't share PostgreSQL binaries across versions. Common migration approaches—dump/restore, logical replication, and snapshot-based upgrades—each carry significant costs in downtime, complexity, or reproducibility. A Docker-native pg-upgrade toolkit promises reproducible, CI-validated migrations with minimal operational overhead.

• •Major PostgreSQL upgrades in containers require both old and new binaries on the same machine, unnatural in containerized environments
• •Common approaches (dump/restore, logical replication, snapshots) each have hidden costs: multi-hour downtime, replication lag, or manual complexity
• •pg-upgrade toolkit transforms upgrades into reproducible, CI-validated three-step processes

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