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@@ -6,12 +6,17 @@ info: To determine the technical writer assigned to the Stage/Group associated w
# Redis guidelines
+## Redis instances
+
GitLab uses [Redis](https://redis.io) for the following distinct purposes:
- Caching (mostly via `Rails.cache`).
- As a job processing queue with [Sidekiq](sidekiq_style_guide.md).
- To manage the shared application state.
+- To store CI trace chunks.
- As a Pub/Sub queue backend for ActionCable.
+- Rate limiting state storage.
+- Sessions.
In most environments (including the GDK), all of these point to the same
Redis instance.
@@ -29,6 +34,8 @@ more often than it is read.
If [Geo](geo.md) is enabled, each Geo node gets its own, independent Redis
database.
+We have [development documentation on adding a new Redis instance](redis/new_redis_instance.md).
+
## Key naming
Redis is a flat namespace with no hierarchy, which means we must pay attention