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How to change a Redis cluster's resources

This guide explains how to adjust an existing Redis cluster from the Hikube console: preset (CPU and memory), volume size, version, external access and authentication.

Prerequisites​

  • An existing Redis cluster in your project
  • Sufficient project quotas for the new configuration

What can be changed​

ParameterCan be changed after creation
Redis VersionYes, to a higher version only
PresetYes
Volume Size (GB)Yes, upwards only
External accessYes
Authentication requiredYes
Number of replicasNo, "The mode cannot be changed after creation"

To change the number of replicas, contact support.

Steps​

1. Open the edit form​

  1. Open DB & Messaging → Redis.
  2. Open the cluster, then click Edit (or use Actions → Edit in the list).

The Edit cluster page shows the Cluster settings card and the impact on the project quotas, which also counts the three sentinels at the size of the preset.

2. Adjust the settings​

  • Preset: choose a larger preset if memory is saturated. The preset's memory caps the volume of data Redis can keep in memory. A cluster created with a former preset (small, medium…) keeps it as long as you do not choose another one.
  • Volume Size (GB): "Storage capacity allocated to each node in the cluster". Enter a size at least equal to the current size.
  • Redis Version: 8 (Latest) or 7. The form offers both versions, but only the current version or a higher one is accepted: on a cluster running 8, do not choose 7.
  • External access: "Allow access to the cluster from outside the private network".
  • Authentication required: "Enable password protection".

3. Save​

Click Save changes. The "Changes saved" message confirms the change.

A lower version or a reduced volume size is refused: the console displays "An error occurred while updating the cluster.", followed by the reason returned by the API (codes 120203 for the version, 120204 for the volume).

warning

Disabling authentication on a cluster exposed on the public network makes your data accessible to anyone who knows the address. Keep authentication enabled.

Verification​

  • The cluster page, General section, shows the new Version and the new Size.
  • From a client, check the available memory:
redis-cli -h <host> -p 6379 INFO memory | grep -E 'used_memory_human|maxmemory_human'

Further reading​