Configure an external in-memory cache

This documentation is for the CARTO Self-Hosted Legacy Version. Use only if you've installed this specific version. Explore our latest documentation for updated features.

CARTO Self-Hosted requires Redis (version 6 or above) to work. This Redis instance does not need persistence, as it is used solely as a cache.

Both Single VM deployment and Orchestrated container deployment come already with an internal Redis deployment, but they lack any backups, autoscaling, or monitoring. Cloud vendors already offer Redis deployments at scale as a service:

• Google Memorystore for Redis.

• Amazon ElastiCache for Redis.

• Azure Cache for Redis.

In this section, you will see how to configure the Self-hosted to use an external Redis provided by your cloud vendor.

Single VM deployments (Docker Compose)

Configuration

1. Comment the local Redis configuration:

   # Configuration for using a local redis, instead of a external one (comment when external redis)
   - LOCAL_REDIS_SCALE=1
   - REDIS_HOST=redis
   - REDIS_PORT=6379
   - REDIS_TLS_ENABLED=false
   + # LOCAL_REDIS_SCALE=1
   + # REDIS_HOST=redis
   + # REDIS_PORT=6379
   + # REDIS_TLS_ENABLED=false

2. Uncomment the external Redis configuration:

   # Your custom configuration for a external redis (comment when local redis)
   - # LOCAL_REDIS_SCALE=0
   - # REDIS_HOST=<FILL_ME>
   - # REDIS_PORT=<FILL_ME>
   - # REDIS_PASSWORD=<FILL_ME>
   - # REDIS_TLS_ENABLED=true
   # Only applies if Redis TLS certificate it's self signed, read the documentation
   # REDIS_TLS_CA=<FILL_ME>
   + LOCAL_REDIS_SCALE=0
   + REDIS_HOST=<FILL_ME>
   + REDIS_PORT=<FILL_ME>
   + REDIS_PASSWORD=<FILL_ME>
   + REDIS_TLS_ENABLED=true

3. Replace the <FILL_ME> placeholders with the right values.

Configure TLS

By default, CARTO will try to connect to your Redis without TLS, in case you want to connect via TLS, you can configure it via REDIS_TLS_ENABLED env vars in the customer.env file.

REDIS_TLS_ENABLED=true

⚠️ In case you are connecting to a Redis instance where the TLS certificate is self signed or from a custom CA you will need to configure the REDIS_TLS_CA variable

1. Copy your CA .crt file inside the certs folder. Rename the CA .crt file to redis-tls-ca.crt.

2. Uncomment the REDIS_TLS_CA env var in the customer.env file.

   # Only applies if Redis TLS certificate it's selfsigned, read the documentation
   - # REDIS_TLS_CA=/usr/src/certs/redis-tls-ca.crt
   + REDIS_TLS_CA=/usr/src/certs/redis-tls-ca.crt

Orchestrated container deployment (Kubernetes)

Configuration

Manually secrets creation

1. Add the secret:

kubectl create secret generic \
  -n <namespace> \
  mycarto-custom-redis-secret \
  --from-literal=password=<AUTH string password>

1. Configure the package:

Add the following lines to your customizations.yaml to connect to the external Redis:

internalRedis:
  # Disable the internal Redis
  enabled: false
externalRedis:
  host: <Redis IP/Hostname>
  port: "6379"
  existingSecret: "mycarto-custom-redis-secret"
  existingSecretPasswordKey: "password"
  tlsEnabled: true
  # Only applies if your Redis TLS certificate it's self-signed
  # tlsCA: |
  #   -----BEGIN CERTIFICATE-----
  #   ...
  #   -----END CERTIFICATE-----

Automatic secrets creation

1. Add the following lines to your customizations.yaml to connect to the external Redis:

internalRedis:
  # Disable the internal Redis
  enabled: false
externalRedis:
  host: <Redis IP/Hostname>
  port: "6379"
  password: <Redis password>
  tlsEnabled: true
  # Only applies if your Redis TLS certificate it's self-signed
  # tlsCA: |
  #   -----BEGIN CERTIFICATE-----
  #   ...
  #   -----END CERTIFICATE-----

Note: One kubernetes secret is going to be created automatically during the installation process with the externalRedis.password that you set in previous lines.

Configure TLS

By default, CARTO will try to connect to your Redis without TLS enabled. In case you want to connect via TLS, you can configure it via the externalRedis.tlsEnabled parameter.

externalRedis:
  ...
  tlsEnabled: true

In case you are connecting to a Redis where the TLS certificate is selfsigned or from a custom CA you can configure it via the externalRedis.tlsCA parameter

externalRedis:
  ...
  tlsEnabled: true
  tlsCA: |
    #   -----BEGIN CERTIFICATE-----
    #   ...
    #   -----END CERTIFICATE-----