v.21.6Improvement

Support dynamic interserver credentials for zero-downtime rotation

Support dynamic interserver credentials (rotating credentials without downtime). #14113 (johnskopis).
Dynamic Interserver Credentials Support: Introduces the ability to use rotating interserver credentials without requiring downtime.

Why it matters

This feature enables secure and seamless rotation of interserver authentication credentials in a ClickHouse cluster. It solves the problem of credential management by allowing dynamic updates without interrupting cluster operations, enhancing security and operational flexibility.

How to use it

Users can enable dynamic interserver credentials by configuring the cluster to accept credential rotations. This typically involves setting up credential update mechanisms in the server configuration to allow new credentials to be introduced and used on the fly without restarting services.