Consul agent: Watches the status of the PostgreSQL service definition on the Consul cluster.PgBouncer: The database connection pooler itself.These nodes must have reached the quorum and elected a leader before Patroni cluster bootstrap otherwise, database nodes wait until such Consul leader is elected. The Consul server node runs the Consul server service. The agent monitors the status of each node in the database cluster and tracks its health in a service definition on the Consul cluster. Consul agent: To communicate with Consul cluster which stores the current Patroni state.Used for read queries as part of Database Load Balancing. PgBouncer: A local pooler for the node.Instructing remaining servers to follow the new leader node.Selecting a new leader for the cluster.Patroni: Communicates with other Patroni services in the cluster and handles failover when issues with the leader server occurs.Shipped with Omnibus GitLab, and thus Patroni becomes mandatory for replication and failover. Starting with GitLab 14.0, only PostgreSQL 12 is See the Patroni section for further details. Clustering for PostgreSQL 12 is supported only with Note that this is separate from the main PgBouncer cluster that tracks the primary.Īs of GitLab 13.3, PostgreSQL 12 is shipped with Omnibus GitLab. A local PgBouncer service configured on each PostgreSQL node.An internal load balancer (TCP) to balance requests between the PgBouncer nodes.A minimum of three PgBouncer nodes that track and handle primary database reads and writes.A minimum of three Consul server nodes.The Omnibus GitLab recommended configuration for a PostgreSQL cluster with It’s recommended to read this document fully before attempting to configure PostgreSQL with If a setup with replication and failover isn’t what you were looking for, see This document doesn’t cover installations from source. If you’re a Free user of GitLab self-managed, consider using a cloud-hosted solution. PostgreSQL replication and failover with Omnibus GitLab Patroni fails to start with MemoryError.Errors in Patroni logs: the requested start point is ahead of the Write Ahead Log (WAL) flush position.Errors in the Patroni log about a pg_hba.conf entry for 127.0.0.1.PgBouncer error ERROR: pgbouncer cannot connect to server.Consul and PostgreSQL changes not taking effect.Upgrading PostgreSQL major version in a Patroni cluster.Selecting the appropriate Patroni replication method.Example recommended setup for PostgreSQL servers.Example recommended setup for PgBouncer servers.Example recommended setup for Consul servers.
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