Kubeblocks Engine Redis

Redis Engine Entry

Use this as the primary create-time entry for Redis. Tier-1 Redis never falls back to kubeblocks-engine-generic.

Cold-Start Contract

• Run kubeblocks-preflight whenever the environment is not already profiled.
• Treat engine-create-matrix as the create-time truth for topology, version strategy, sizing, validation, next hops, and forbidden routes.
• Use observability-capability-matrix before promising scrape or alert readiness.
• Keep the legacy kubeblocks-addon-redis path as preserved detail only, not as the primary cold-start route.

Topology Selection

• Default topology: replication
• standalone: only for dev/test or throwaway cache workloads where HA is unnecessary.
• replication: default choice for most durable Redis rollouts because Sentinel-backed failover is already part of the path.
• sharding: choose only when the keyspace or write load has outgrown a single shard and the client path can speak Redis Cluster.
• If the user only needs a cache and has no explicit horizontal-scale requirement, stay on replication.

ServiceVersion / Version Strategy

• Strategy: use the stable addon default from current examples unless the user explicitly pins a serviceVersion
• Current preserved evidence centers on Redis 7.2.4, with 7.0.6 still available as an older supported line.
• For sharding, keep the serviceVersion aligned across shard template and sentinel or access components.

Preflight Interpretation

• storage_class: required before apply because Redis persistence still lands on PVC-backed storage.
• volume_binding_mode: confirm zone behavior before choosing replicated or sharded layouts that span nodes.
• addon_readiness: Redis addon must be installed first.
• observability_mode: Redis has exporter, scrape, and alert examples, so pick existing-stack vs bootstrap before rollout.

Sizing Profiles

• demo: standalone or small replication with modest CPU, memory, and PVCs.
• production: replication or sharding with explicit failover expectations, anti-affinity, and capacity headroom for rebalancing.
• For sharding, treat shard count as a capacity decision, not a cosmetic topology toggle.

Minimal Create Path

apiVersion: apps.kubeblocks.io/v1
kind: Cluster
metadata:
  name: <cluster>
  namespace: <ns>
spec:
  terminationPolicy: Delete

• Do not leave this skill to read raw addon examples before drafting the manifest.
• Set clusterDef: redis for every dedicated Redis path in this wave.
• standalone: set topology: standalone, keep a single name: redis component, and place serviceVersion, resources, and volumeClaimTemplates on that component.
• replication: set topology: replication, keep name: redis and name: redis-sentinel, and size replicas plus PVCs on the storage-bearing Redis component.
• sharding: declare shardings: instead of a single component, use template name: redis, set componentDef: redis-cluster-7, and put serviceVersion, replicas, resources, and volumeClaimTemplates on the shard template.
• Validate with kubectl apply --dry-run=server -f <redis-cluster.yaml>.
• Apply with kubectl apply -f <redis-cluster.yaml>.
• Watch kubectl get cluster <name> -n <ns> -w until the phase is Running.

Connection and Validation

• Supported connection methods: in-cluster service, port-forward, exposed service
• First validation step: kubectl get cluster <name> -n <ns> and wait for Running.
• Default validation: redis-cli -h <service> -p 6379 -a <password> PING.
• For sharding, validate with redis-cli -c and a cluster command such as CLUSTER INFO before handoff.

Next Hops

• Day-2 operations currently route to kubeblocks-op-lifecycle, kubeblocks-op-horizontal-scale, kubeblocks-op-reconfigure, kubeblocks-op-backup, and kubeblocks-observability-router.
• Password and Secret handling can route to kubeblocks-manage-accounts.
• Do not send this path to kubeblocks-rebuild-replica; rebuild_instance is not the Redis recovery path in the current ops truth.
• Treat kubeblocks-configure-tls as an engine-specific validation task, not an automatic follow-up promise for every Redis rollout.
• If failover, sharding state, or exposure behavior is unclear, route to kubeblocks-troubleshoot.

Forbidden Routes

• Never route Redis create through kubeblocks-engine-generic or kubeblocks-addon-redis.
• Do not collapse Redis into a generic cache path when the user is really asking for replication or cluster sharding semantics.

Evidence Anchors

• Use the evidence anchors below only as optional secondary evidence and parity checks after the manifest is already drafted here. A cold-start runtime should not need these files, but a stronger agent may inspect them when available.
• Preserved detail remains in legacy reference.
• Current addon evidence: examples/redis/cluster-standalone.yaml, examples/redis/cluster.yaml, examples/redis/cluster-sharding.yaml, examples/redis/cluster-twemproxy.yaml.