Selenium Grid node not registering with hub on AWS ECS managed EC2

[Josh Morris]

I have selenium grid running perfectly locally using docker-compose, all nodes register with the hub fine and tests execute great when ran against the hub.

However I am trying now to get this running on a ECS managed EC2. I have tried to replicate the behavior of my local docker-compose file in a task-definition. When running the task and the containers come online, I can see that the browser node is not registering with the hub when viewing the ui/index.html page

I am at a loss on what the problem could be, any help would be greatly appreciated.

I have been building the task-definition with the AWS Console, but here is the JSON equivalent:

{
   "ipcMode":null,
   "executionRoleArn":"arn:aws:iam::xxxxxxxxxxxx:role/Selenium-ECR-Task",
   "containerDefinitions":[
      {
         "dnsSearchDomains":null,
         "environmentFiles":null,
         "logConfiguration":null,
         "entryPoint":null,
         "portMappings":[
            {
               "hostPort":4442,
               "protocol":"tcp",
               "containerPort":4442
            },
            {
               "hostPort":4443,
               "protocol":"tcp",
               "containerPort":4443
            },
            {
               "hostPort":4444,
               "protocol":"tcp",
               "containerPort":4444
            }
         ],
         "command":[
            
         ],
         "linuxParameters":null,
         "cpu":1000,
         "environment":[
            
         ],
         "resourceRequirements":null,
         "ulimits":null,
         "dnsServers":null,
         "mountPoints":[
            
         ],
         "workingDirectory":null,
         "secrets":null,
         "dockerSecurityOptions":null,
         "memory":null,
         "memoryReservation":2096,
         "volumesFrom":[
            
         ],
         "stopTimeout":60,
         "image":"xxxxxxxxxxxx.dkr.ecr.eu-west-1.amazonaws.com/selenium-hub",
         "startTimeout":30,
         "firelensConfiguration":null,
         "dependsOn":null,
         "disableNetworking":null,
         "interactive":null,
         "healthCheck":{
            "retries":5,
            "command":[
               "CMD-SHELL",
               "curl -f http://localhost:4444 || exit 1"
            ],
            "timeout":60,
            "interval":5,
            "startPeriod":5
         },
         "essential":true,
         "links":null,
         "hostname":"selenium-hub",
         "extraHosts":null,
         "pseudoTerminal":null,
         "user":null,
         "readonlyRootFilesystem":null,
         "dockerLabels":null,
         "systemControls":null,
         "privileged":true,
         "name":"selenium-hub"
      },
      {
         "dnsSearchDomains":null,
         "environmentFiles":null,
         "logConfiguration":null,
         "entryPoint":null,
         "portMappings":[
            {
               "hostPort":6900,
               "protocol":"tcp",
               "containerPort":5900
            }
         ],
         "command":null,
         "linuxParameters":null,
         "cpu":1000,
         "environment":[
            {
               "name":"SE_EVENT_BUS_HOST",
               "value":"selenium-hub"
            },
            {
               "name":"SE_EVENT_BUS_PUBLISH_PORT",
               "value":"4442"
            },
            {
               "name":"SE_EVENT_BUS_SUBSCRIBE_PORT",
               "value":"4443"
            }
         ],
         "resourceRequirements":null,
         "ulimits":null,
         "dnsServers":null,
         "mountPoints":[
            
         ],
         "workingDirectory":null,
         "secrets":null,
         "dockerSecurityOptions":null,
         "memory":2096,
         "memoryReservation":null,
         "volumesFrom":[
            
         ],
         "stopTimeout":30,
         "image":"selenium/standalone-chrome:4.0.0",
         "startTimeout":30,
         "firelensConfiguration":null,
         "dependsOn":[
            {
               "containerName":"selenium-hub",
               "condition":"HEALTHY"
            }
         ],
         "disableNetworking":null,
         "interactive":null,
         "healthCheck":null,
         "essential":true,
         "links":null,
         "hostname":null,
         "extraHosts":null,
         "pseudoTerminal":null,
         "user":null,
         "readonlyRootFilesystem":null,
         "dockerLabels":null,
         "systemControls":null,
         "privileged":null,
         "name":"standalone-chrome"
      }
   ],
   "placementConstraints":[
      
   ],
   "memory":"2096",
   "taskRoleArn":"arn:aws:iam::xxxxxxxxxxxx:role/Selenium-ECR-Task",
   "compatibilities":[
      "EXTERNAL",
      "EC2"
   ],
   "taskDefinitionArn":"arn:aws:ecs:eu-west-1:xxxxxxxxxxxx:task-definition/Selenium-Task-Definition:52",
   "family":"Selenium-Task-Definition",
   "requiresAttributes":[
      {
         "targetId":null,
         "targetType":null,
         "value":null,
         "name":"com.amazonaws.ecs.capability.ecr-auth"
      },
      {
         "targetId":null,
         "targetType":null,
         "value":null,
         "name":"com.amazonaws.ecs.capability.privileged-container"
      },
      {
         "targetId":null,
         "targetType":null,
         "value":null,
         "name":"com.amazonaws.ecs.capability.docker-remote-api.1.17"
      },
      {
         "targetId":null,
         "targetType":null,
         "value":null,
         "name":"com.amazonaws.ecs.capability.docker-remote-api.1.21"
      },
      {
         "targetId":null,
         "targetType":null,
         "value":null,
         "name":"com.amazonaws.ecs.capability.task-iam-role"
      },
      {
         "targetId":null,
         "targetType":null,
         "value":null,
         "name":"ecs.capability.container-health-check"
      },
      {
         "targetId":null,
         "targetType":null,
         "value":null,
         "name":"ecs.capability.container-ordering"
      },
      {
         "targetId":null,
         "targetType":null,
         "value":null,
         "name":"ecs.capability.execution-role-ecr-pull"
      },
      {
         "targetId":null,
         "targetType":null,
         "value":null,
         "name":"com.amazonaws.ecs.capability.docker-remote-api.1.29"
      }
   ],
   "pidMode":null,
   "requiresCompatibilities":[
      "EC2"
   ],
   "networkMode":"bridge",
   "cpu":"2000",
   "revision":52,
   "status":"ACTIVE",
   "inferenceAccelerators":null,
   "proxyConfiguration":null,
   "volumes":[
      
   ]
}

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