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42 lines
1.1 KiB
ReStructuredText
42 lines
1.1 KiB
ReStructuredText
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.. meta::
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:description: Hasura Cloud read replicas
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:keywords: hasura, docs, cloud, read replicas, connections, pool
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.. _read_replicas:
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Read replicas
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=============
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.. contents:: Table of contents
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:backlinks: none
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:depth: 1
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:local:
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Introduction
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------------
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Hasura Cloud can load balance queries and subscriptions across read replicas while sending all mutations and metadata API calls to the master.
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Adding read replica urls
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------------------------
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If you have configured your Postgres instances with replicas, the replica URLs can be added to Hasura using the following environment variable in your project ENV Vars tab:
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.. code-block:: bash
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HASURA_GRAPHQL_READ_REPLICA_URLS=postgres://user:password@replica-host:5432/db
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If you have multiple replicas, their urls can be added as comma separated values.
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Connection pool parameters
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--------------------------
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Additional environment variables for connection pools, and for read replicas specifically:
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``HASURA_GRAPHQL_PG_STRIPES``
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``HASURA_GRAPHQL_PG_CONNECTIONS``
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``HASURA_GRAPHQL_CONNECTIONS_PER_READ_REPLICA``
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``HASURA_GRAPHQL_STRIPES_PER_READ_REPLICA``
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