Migrate from node package "redis" to "ioredis" for redis high availability support. #1831

New Issue

MrUnknownDE · 2026-04-05T16:35:15+02:00

MrUnknownDE commented

2026-04-05 16:35:15 +02:00

Originally created by @kashalls on 7/28/2023

When connecting to a sentinel-enabled redis cluster, regardless of what node you connect to, you will be met with an error of ReplyError: READONLY You can't write against a read only replica.. This can be solved by disabling sentinel in the config, however this makes the redis cluster much less highly available.

The redis package has had an issue open for sentinel support since 2012 and still has not been resolved.

I recommend switching to ioredis as other open source software has found success switching to it. See immich.

This is highly sought after as deploying a non-sentinel container makes it difficult to provide a high availability database to support this app.

*Originally created by @kashalls on 7/28/2023* When connecting to a sentinel-enabled redis cluster, regardless of what node you connect to, you will be met with an error of `ReplyError: READONLY You can't write against a read only replica.`. This can be solved by disabling sentinel in the config, however this makes the redis cluster much less highly available. The [redis package](https://github.com/redis/node-redis/) has had an[ issue open for sentinel support](https://github.com/redis/node-redis/issues/302) since 2012 and still has not been resolved. I recommend switching to [ioredis](https://www.npmjs.com/package/ioredis) as other open source software has found success switching to it. [See immich](https://github.com/immich-app/immich/issues/473). This is highly sought after as deploying a non-sentinel container makes it difficult to provide a high availability database to support this app.

MrUnknownDE closed this issue

2026-04-05 16:35:15 +02:00

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Reference: github/oneuptime#1831