Creating a Redis OSS replication group
You have the following options for creating a cluster with replica nodes. One applies when you already have an available Redis OSS (cluster mode disabled) cluster not associated with any cluster that has replicas to use as the primary node. The other applies when you need to create a primary node with the cluster and read replicas. Currently, a Redis OSS (cluster mode enabled) cluster must be created from scratch.
- Option 1: Creating a Replication Group Using an Available Redis OSS (Cluster Mode Disabled) Cluster
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Use this option to leverage an existing single-node Redis OSS (cluster mode disabled) cluster. You specify this existing node as the primary node in the new cluster, and then individually add 1 to 5 read replicas to the cluster. If the existing cluster is active, read replicas synchronize with it as they are created. See Creating a Replication Group Using an Available Redis OSS (Cluster Mode Disabled) Cluster.
Important
You cannot create a Redis OSS (cluster mode enabled) cluster using an existing cluster. To create a Redis OSS (cluster mode enabled) cluster (API/CLI: replication group) using the ElastiCache console, see Creating a Redis OSS (cluster mode enabled) cluster (Console).
- Option 2: Creating a Redis OSS replication group from scratch
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Use this option if you don't already have an available Redis OSS (cluster mode disabled) cluster to use as the cluster's primary node, or if you want to create a Redis OSS (cluster mode enabled) cluster. See Creating a Redis OSS replication group from scratch.