Example using parameters

marathon.json

{
  "id": "/app",
  "container": {
    "type": "DOCKER",
    "docker": {
      "network": "HOST",
      "image": "registry.spantree.net/app:#{BUILD_ID}",
      "privileged": true,
      "forcePullImage": true,
      "parameters": [
        { "key": "env", "value": "JAVA_OPTS=-Xmx1024m -Xms1024m -Dserver.port=8081" },

        { "key": "env", "value": "SFDC_BASERURL=#{SFDC_BASEURL}" },
        { "key": "env", "value": "SFDC_USER=#{SFDC_USER}" },
        { "key": "env", "value": "SFDC_PASSWORD=#{SFDC_PASSWORD}" },
        { "key": "env", "value": "SFDC_TOKEN=#{SFDC_TOKEN}" },

        { "key": "env", "value": "AZURE_CLIENT_ID=#{AZURE_CLIENT_ID}" },
        { "key": "env", "value": "AZURE_CLIENT_SECRET=#{AZURE_CLIENT_SECRET}" }
      ]
    }
  },
  "uris": [
    "file:///etc/.dockercfg"
  ],
  "ports": [ 0 ],
  "healthChecks": [
    {
      "protocol": "COMMAND",
      "command": { "value": "curl -f -X GET http://$HOST:8081/api/v1/health" },
      "gracePeriodSeconds": 300,
      "intervalSeconds": 20,
      "timeoutSeconds": 5,
      "maxConsecutiveFailures": 3
    }
  ],
  "instances": 1,
  "cpus": 1,
  "mem": 2048
}