Can't start schemaregistry

I am trying to start the schema registry docker image with the following configs:

  schema-registry:
    image: confluentinc/cp-schema-registry:5.1.3
    network_mode: "host"
    environment:
      SCHEMA_REGISTRY_KAFKASTORE_CONNECTION_URL: "localhost:2181"
      SCHEMA_REGISTRY_HOST_NAME: localhost
      SCHEMA_REGISTRY_LISTENERS: "http://localhost:8081"
    depends_on:
      - kafka
    ports:
      - "8081:8081"

Although I am facing the following error:

Exception in thread "main" java.lang.ExceptionInInitializerError
	at io.confluent.kafka.schemaregistry.rest.SchemaRegistryMain.main(SchemaRegistryMain.java:41)
Caused by: io.confluent.common.config.ConfigException: Invalid value java.net.UnknownHostException: linuxkit-025000000001: linuxkit-025000000001: Name or service not known for configuration Unknown local hostname
	at io.confluent.kafka.schemaregistry.rest.SchemaRegistryConfig.getDefaultHost(SchemaRegistryConfig.java:405)
	at io.confluent.kafka.schemaregistry.rest.SchemaRegistryConfig.<clinit>(SchemaRegistryConfig.java:259)

Any ideias?

[OneCricketeer]

As I’ve pointed out already localhost/127.0.0.1 is almost never the correct address when working with Docker services

https://github.com/zhenik-poc/hashicorp-stacks/blob/master/learn/consul-connect/kafka/kafka.hcl#L18-L21

KAFKA_LISTENERS should be 0.0.0.0

Understand what the advertised listeners are https://www.confluent.io/blog/kafka-listeners-explained/

For Nomad, use the Zookeeper Consul DNS name, not localhost. Use the correct ports, not 9181 (unless you changed it for some reason)

For Schema Registry, I would suggest not using Zookeeper and use the Kafka-based election mode (refer to the documentation)

[Victoremepunto]

I was running into issues until I set the hostname parameter to localhost, or I guess the same value as the SCHEMA_REGISTRY_HOST_NAME variable.