---
name: "pg_autoctl create coordinator"
section: "1"
platform: "linux"
package: "pg-auto-failover-cli"
version: "2.2-2"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/pg_autoctl create coordinator"
---

# pg\_autoctl create coordinator(1)

pg\_autoctl create coordinator pg\_autoctl create coordinator - Initialize a pg\_auto\_failover coordinator node

## NAME

pg\_autoctl create coordinator - pg\_autoctl create coordinator

pg\_autoctl create coordinator - Initialize a pg\_auto\_failover coordinator node

## SYNOPSIS

The command **pg\_autoctl create coordinator** initializes a pg\_auto\_failover Coordinator node for a Citus formation. The coordinator is special in a Citus formation: that's where the client application connects to either to manage the formation and the sharding of the tables, or for its normal SQL traffic.

The coordinator also has to register every worker in the formation.

```
usage: pg_autoctl create coordinator
  --pgctl           path to pg_ctl
  --pgdata          path to data directory
  --pghost          PostgreSQL's hostname
  --pgport          PostgreSQL's port number
  --hostname        hostname by which postgres is reachable
  --listen          PostgreSQL's listen_addresses
  --username        PostgreSQL's username
  --dbname          PostgreSQL's database name
  --name            pg_auto_failover node name
  --formation       pg_auto_failover formation
  --monitor         pg_auto_failover Monitor Postgres URL
  --auth            authentication method for connections from monitor
  --skip-pg-hba     skip editing pg_hba.conf rules
  --citus-secondary when used, this worker node is a citus secondary
  --citus-cluster   name of the Citus Cluster for read-replicas
  --ssl-self-signed setup network encryption using self signed certificates (does NOT protect against MITM)
  --ssl-mode        use that sslmode in connection strings
  --ssl-ca-file     set the Postgres ssl_ca_file to that file path
  --ssl-crl-file    set the Postgres ssl_crl_file to that file path
  --no-ssl          don't enable network encryption (NOT recommended, prefer --ssl-self-signed)
  --server-key      set the Postgres ssl_key_file to that file path
  --server-cert     set the Postgres ssl_cert_file to that file path
```

## DESCRIPTION

This commands works the same as the *pg\_autoctl create postgres* command and implements the following extra steps:

- 1\.

  adds **shared\_preload\_libraries = citus** to the local PostgreSQL instance configuration.

- 2\.

  enables the whole local area network to connect to the coordinator, by adding an entry for e.g. **192.168.1.0/24** in the PostgreSQL HBA configuration.

- 3\.

  creates the extension **citus** in the target database.

**IMPORTANT:**

The default **--dbname** is the same as the current system user name, which in many case is going to be **postgres**. Please make sure to use the **--dbname** option with the actual database that you're going to use with your application.

Citus does not support multiple databases, you have to use the database where Citus is created. When using Citus, that is essential to the well behaving of worker failover.

## OPTIONS

See the manual page for *pg\_autoctl create postgres* for the common options. This section now lists the options that are specific to **pg\_autoctl create coordinator**:

- **--citus-secondary**

  Use this option to create a coordinator dedicated to a Citus Secondary cluster.

  See *Citus Secondaries and read-replica* for more information.

- **--citus-cluster**

  Use this option to name the Citus Secondary cluster that this coordinator node belongs to. Use the same cluster name again for the worker nodes that are part of this cluster.

  See *Citus Secondaries and read-replica* for more information.

## AUTHOR

Microsoft

## COPYRIGHT

Copyright (c) Microsoft Corporation. All rights reserved.