How to Deploy Quarkus on with Redis

To activate Redis and then have it accessed by the Quarkus application already in, it is necessary to modify two files.

1. Add the Redis service 

In your service configuration, include Persistent Redis with a valid supported version:

    type: redis-persistent:7.0
    disk: 256

2. Add the Redis relationship 

In your app configuration, use the service name searchelastic to grant the application access to Elasticsearch via a relationship:
    redisdata: "data:redis"

3. Export connection credentials to the environment 

Connection credentials for Redis, like any service, are exposed to the application container through the PLATFORM_RELATIONSHIPS environment variable from the deploy hook onward. Since this variable is a base64 encoded JSON object of all of your project’s services, you’ll likely want a clean way to extract the information specific to Elasticsearch into it’s own environment variables that can be used by Quarkus. On, custom environment variables can be defined programmatically in a .environment file using jq to do just that:

export REDIS_HOST=$(echo $PLATFORM_RELATIONSHIPS | base64 --decode | jq -r ".redisdata[0].host")
export REDIS_PORT=$(echo $PLATFORM_RELATIONSHIPS | base64 --decode | jq -r ".redisdata[0].port")
export JAVA_OPTS="-Xmx$(jq .info.limits.memory /run/config.json)m -XX:+ExitOnOutOfMemoryError"

4. Connect to Redis 

Commit that code and push. The Redis instance is ready to be connected from within the Quarkus application.