Nomad Java Driver Bridge Networking UnknownHostException

Nomad
7

Hi @romasi :wave:

I’m not an expert on AWS networking, but I think you will need to specify the AWS internal DNS IP in your job.

Here’s the job that used for testing:

job "petclinic" {
  datacenters = ["dc1"]

  group "petclinic" {
    network {
      mode = "bridge"

      dns {
        servers = ["169.254.169.253"]
      }

      port "http" {}
    }

    task "petclinic" {
      driver = "java"

      config {
        jar_path    = "local/spring-petclinic-1.0.jar"
        jvm_options = ["-Xmx512m", "-Xms256m", "-Dserver.port=${NOMAD_PORT_http}"]
      }

      artifact {
        source      = "https://github.com/lgfa29/spring-petclinic/releases/download/v1.0/spring-petclinic-1.0.jar"
        destination = "local"
      }

      resources {
        memory = 512
      }
    }
  }
}

I’m not sure if the IP 169.254.169.253 is the same in all regions, so you might need to check the AWS documentation for more details.

@animeshjain,

I didn’t test this with RDS, but I think it would work as well. I was able to curl internal hostnames and IPs without problems.

Give it a try and let me know how it goes :slightly_smiling_face: