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This article explains the concepts of high availability, continuous recovery, and standby databases, then reviews various PostgreSQL clustering options such as DRBD, ClusterControl, Rubyrep, Pgpool‑II, Bucardo, Postgres‑XC, Citus, and PostgresXL, highlighting their features, advantages, and drawbacks.
This guide details a step‑by‑step setup of a highly available GitLab service using two virtual machines, DRBD for block‑level replication, configuration of GitLab and PostgreSQL directories, DRBD resource creation, service start‑up, and manual primary‑secondary failover procedures.
The article outlines a Linux server architecture that mounts a read‑only root filesystem over the network from a centrally managed, DRBD‑replicated control node with Heartbeat failover, providing real‑time updates, high security (even root cannot modify), and automatic migration via virtual IP.