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Answer from AWS support:
On 2024-03-26 at 18:07:00 UTC, ElastiCache applied patching update
elasticache-20240225-arm
for your replication group named qqq in yyy region. Due to a bug , ipv6 address for your nodeqqq-0001-001
was removed from the endpoint.We have since fixed the issue for your cluster and ipv6 address has been updated for your replication group.
This is not the answer you expect, but when cluster mode is enabled, the Configuration endpoint is used, so I don't think you would use the per-node endpoint directly.
https://docs.aws.amazon.com/AmazonElastiCache/latest/red-ug/Endpoints.html
Of course, the per-node endpoint can be named resolved. If the node's endpoint cannot resolve the name, it may be that the node is currently unavailable. Check the node's status in the management console.
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Thanks for answer! Unfortunately problem still persist. Absence of DNS is a consequence, not a cause. For sure, we don't use per-node endpoint directly, I've provided this information just for debugging purposes. While calling any command via redis driver (node.js) or via redis cli, for instance
keys *
, we've seen this error:(there I use teleport, but with redis-cli the error is the same).
Also, in AWS console (and aws cli) the whole cluster itself and each node respectively has green status "Available".
I expect the network is the cause, but unfortunately, I have no experience with Redis with IPv6, so I can't offer any definite support.
I assume you have already read this, but please check around your network with the following reference.
https://repost.aws/knowledge-center/elasticache-redis-cluster-fix-connection
https://docs.aws.amazon.com/AmazonElastiCache/latest/red-ug/TroubleshootingConnections.html https://docs.aws.amazon.com/AmazonElastiCache/latest/red-ug/network-type-best-practices.html