Redis Streams

Detailed documentation on the Redis Streams pubsub component

Component format

To set up Redis Streams pub/sub, create a component of type pubsub.redis. See the pub/sub broker component file to learn how ConsumerID is automatically generated. Read the How-to: Publish and Subscribe guide on how to create and apply a pub/sub configuration.

kind: Component
  name: redis-pubsub
  type: pubsub.redis
  version: v1
  - name: redisHost
    value: localhost:6379
  - name: redisPassword
    value: "KeFg23!"
  - name: consumerID
    value: "channel1"
  - name: enableTLS
    value: "false"

Spec metadata fields

Field Required Details Example
redisHost Y Connection-string for the redis host. If "redisType" is "cluster" it can be multiple hosts separated by commas or just a single host localhost:6379, redis-master.default.svc.cluster.local:6379
redisPassword Y Password for Redis host. No Default. Can be secretKeyRef to use a secret reference "", "KeFg23!"
redisUsername N Username for Redis host. Defaults to empty. Make sure your redis server version is 6 or above, and have created acl rule correctly. "", "default"
consumerID N The consumer group ID. Can be set to string value (such as "channel1" in the example above) or string format value (such as "{podName}", etc.). See all of template tags you can use in your component metadata.
enableTLS N If the Redis instance supports TLS with public certificates, can be configured to be enabled or disabled. Defaults to "false" "true", "false"
redeliverInterval N The interval between checking for pending messages to redeliver. Can use either be Go duration string (for example “ms”, “s”, “m”) or milliseconds number. Defaults to "60s". "0" disables redelivery. "30s", "5000"
processingTimeout N The amount time that a message must be pending before attempting to redeliver it. Can use either be Go duration string ( for example “ms”, “s”, “m”) or milliseconds number. Defaults to "15s". "0" disables redelivery. "60s", "600000"
queueDepth N The size of the message queue for processing. Defaults to "100". "1000"
concurrency N The number of concurrent workers that are processing messages. Defaults to "10". "15"
redisType N The type of redis. There are two valid values, one is "node" for single node mode, the other is "cluster" for redis cluster mode. Defaults to "node". "cluster"
redisDB N Database selected after connecting to redis. If "redisType" is "cluster" this option is ignored. Defaults to "0". "0"
redisMaxRetries N Maximum number of times to retry commands before giving up. Default is to not retry failed commands. "5"
redisMinRetryInterval N Minimum backoff for redis commands between each retry. Default is "8ms"; "-1" disables backoff. "8ms"
redisMaxRetryInterval N Maximum backoff for redis commands between each retry. Default is "512ms";"-1" disables backoff. "5s"
dialTimeout N Dial timeout for establishing new connections. Defaults to "5s". "5s"
readTimeout N Timeout for socket reads. If reached, redis commands will fail with a timeout instead of blocking. Defaults to "3s", "-1" for no timeout. "3s"
writeTimeout N Timeout for socket writes. If reached, redis commands will fail with a timeout instead of blocking. Defaults is readTimeout. "3s"
poolSize N Maximum number of socket connections. Default is 10 connections per every CPU as reported by runtime.NumCPU. "20"
poolTimeout N Amount of time client waits for a connection if all connections are busy before returning an error. Default is readTimeout + 1 second. "5s"
maxConnAge N Connection age at which the client retires (closes) the connection. Default is to not close aged connections. "30m"
minIdleConns N Minimum number of idle connections to keep open in order to avoid the performance degradation associated with creating new connections. Defaults to "0". "2"
idleCheckFrequency N Frequency of idle checks made by idle connections reaper. Default is "1m". "-1" disables idle connections reaper. "-1"
idleTimeout N Amount of time after which the client closes idle connections. Should be less than server’s timeout. Default is "5m". "-1" disables idle timeout check. "10m"
failover N Property to enabled failover configuration. Needs sentinalMasterName to be set. Defaults to "false" "true", "false"
sentinelMasterName N The sentinel master name. See Redis Sentinel Documentation "", ""
maxLenApprox N Maximum number of items inside a stream.The old entries are automatically evicted when the specified length is reached, so that the stream is left at a constant size. Defaults to unlimited. "10000"

Create a Redis instance

Dapr can use any Redis instance - containerized, running on your local dev machine, or a managed cloud service, provided the version of Redis is 5.x or 6.x.

The Dapr CLI will automatically create and setup a Redis Streams instance for you. The Redis instance will be installed via Docker when you run dapr init, and the component file will be created in default directory. ($HOME/.dapr/components directory (Mac/Linux) or %USERPROFILE%\.dapr\components on Windows).

You can use Helm to quickly create a Redis instance in our Kubernetes cluster. This approach requires Installing Helm.

  1. Install Redis into your cluster.

    helm repo add bitnami
    helm install redis bitnami/redis --set image.tag=6.2
  2. Run kubectl get pods to see the Redis containers now running in your cluster.

  3. Add redis-master:6379 as the redisHost in your redis.yaml file. For example:

        - name: redisHost
          value: redis-master:6379
  4. Next, we’ll get our Redis password, which is slightly different depending on the OS we’re using:

    • Windows: Run kubectl get secret --namespace default redis -o jsonpath="{.data.redis-password}" > encoded.b64, which will create a file with your encoded password. Next, run certutil -decode encoded.b64 password.txt, which will put your redis password in a text file called password.txt. Copy the password and delete the two files.

    • Linux/MacOS: Run kubectl get secret --namespace default redis -o jsonpath="{.data.redis-password}" | base64 --decode and copy the outputted password.

    Add this password as the redisPassword value in your redis.yaml file. For example:

        - name: redisPassword
          value: "lhDOkwTlp0"

Last modified July 19, 2024: Fixed typo in links (#4267) (32fce1d)