Configure Redis Cluster

Introduction

Our Gateway, Dashboard and Pump all support integration with Redis Cluster. Redis Cluster allows data to be automatically sharded across multiple Redis Nodes. To setup Redis Cluster correctly, we recommend you read the Redis Cluster Tutorial. You must use the same settings across the Gateway, Dashboard and Pump.

Supported Versions

• Redis 6.0.x to 6.2.x

Redis Cluster & Tyk Gateway

To configure the Tyk Gateway to work with your Redis Cluster, set enable_cluster to true and list your servers under addrs in your tyk.conf file.

If you are using TLS for Redis connections, set use_ssl to true.

"storage": {
  "type": "redis",
  "enable_cluster": true,
  "addrs": [
    "server1:6379",
    "server2:6380",
    "server3:6381"
  ],
  "username": "",
  "password": "",
  "database": 0,
  "optimisation_max_idle": 2000,
  "optimisation_max_active": 4000,
  "use_ssl": false
},

Redis Cluster & Tyk Dashboard

"redis_addrs": [
    "server1:6379",
    "server2:6380",
    "server3:6381"
  ],
"redis_use_ssl": true,
"enable_cluster": true

To configure the Tyk Dashboard to work with your Redis Cluster, add the Redis address information to your tyk_analytics.conf file:

Redis Cluster & Tyk Pump

To configure the Tyk Pump to work with your Redis Cluster, set enable_cluster to true and list your servers under addrs in your pump.conf file.

"analytics_storage_config": {
  "type": "redis",
  "enable_cluster": true,
  "addrs": [
    "server1:6379",
    "server2:6380",
    "server3:6381"
  ],
  "username": "",
  "password": "",
  "database": 0,
  "optimisation_max_idle": 100,
  "use_ssl": false
},

Redis Cluster with TLS

If you are using TLS for Redis connections, set use_ssl to true for Gateway and Pump, and redis_use_ssl to true for the dashboard.

Redis Cluster with Docker

For Redis clustered mode to work with Tyk using Docker and Amazon ElastiCache, follow these two steps:

Step 1: Make sure cluster mode is enabled

Set the environment variable TYK_GW_STORAGE_ENABLECLUSTER to true.

Step 2: Add all cluster endpoints to the config

Add all the Redis Cluster endpoints into Tyk, not just the primary. If Tyk can’t see the whole cluster, then it will not work.

For ElastiCache Redis, you can bypass having to list all your nodes, and instead just use the configuration endpoint, this allows read and write operations and the endpoint will determine the correct node to target.

If this does not work, you can still list out the hosts using an environment variable. To do so, set the environment variable:

TYK_GW_STORAGE_HOSTS="redis_primary1:port,redis_replica1:port,redis_primary2:port,redis_replica2:port,redis_primary3:port,redis_replica3:port"

It is important that Tyk can connect to all primary and replica instances.

It is recommended to ensure that the connection pool is big enough. To do so, set the following environment variables:

TYK_GW_STORAGE_MAXIDLE=6000
TYK_GW_STORAGE_MAXACTIVE=10000

Redis Encryption

Redis does not support SSL / TLS natively https://redis.io/topics/encryption and we recommend that if you require a secure connection, you use a tool such as Spiped. http://www.tarsnap.com/spiped.html

Various cloud providers such as Azure & AWS provide a Redis implementation which supports TLS encryption.

Should you wish to turn on encryption between any of Tyk’s components & Redis - this can simply be achieved by setting "use_ssl": true alongside any Redis configuration settings within Tyk’s config files.

Troubleshooting Redis Cluster

If you find that Tyk components fail to initialise when using Redis clustering, for example the application does not start and the last log file entry shows a message such as Using clustered mode, try setting the environment variable REDIGOCLUSTER_SHARDCOUNT to 128 on all hosts which connect to the Redis Cluster i.e. Gateway, Dashboard, Pump, MDCB. E.g.

REDIGOCLUSTER_SHARDCOUNT=128

If setting to 128 does not resolve the issue, try 256 instead.