I am trying to authenticate my Kafka rest proxy with SASL but I am having trouble transferring the configs made in my local docker compose to Kubernetes.

I am using JAAS configuration to achieve this. My JAAS file looks like this.

KafkaClient {
       org.apache.kafka.common.security.plain.PlainLoginModule required
       username="rest"
       password="rest-secret";
};

Client {
       org.apache.zookeeper.server.auth.DigestLoginModule required
       username="rest"
       password="restsecret";
};

and then in my docker compose I have done:

KAFKA_OPTS: -Djava.security.auth.login.config=/etc/kafka/secrets/rest_jaas.conf

How will I transfer this same logic to Kubernetes? I have tried passing the env variable like this:

env:
  - name: KAFKA_OPTS
    value: |
      KafkaClient {
        org.apache.kafka.common.security.plain.PlainLoginModule required
        username="rest"
        password="rest-secret";
      };
      Client {
        org.apache.zookeeper.server.auth.DigestLoginModule required
        username="rest"
        password="rest-secret";
      };

but it still fails. Here is what my logs say:

Error: Could not find or load main class KafkaClient
/bin/sh: 3: org.apache.kafka.common.security.plain.PlainLoginModule: not found
/bin/sh: 6: Syntax error: "}" unexpected

Your help will be highly appreciated.