DC/OS marathon Virtual network not working - mesos

Question

I installed DC/OS with 3 masters and 3 agents and face a problem with virtual networking. Here is my Marathon app spec:
{
"id": "/nginx",
"cmd": null,
"cpus": 1,
"mem": 128,
"disk": 0,
"instances": 1,
"container": {
"type": "DOCKER",
"volumes": [],
"docker": {
"image": "nginx",
"network": "BRIDGE",
"portMappings": [
{
"containerPort": 80,
"hostPort": 0,
"servicePort": 10002,
"protocol": "tcp",
"name": "main1",
"labels": {
"VIP_0": "9.0.0.0:34562"
}
}
],
"privileged": false,
"parameters": [],
"forcePullImage": false
}
},
"portDefinitions": [
{
"port": 10002,
"protocol": "tcp",
"labels": {}
}
]
}
I see the following in the DC/OS virtual network section:
VIRTUAL NETWORK NAME | SUBNET | AGENT PREFIX LENGTH
dcos 9.0.0.0/8 24
The containers stays in waiting for a long time. If I remove the port mapping section it runs successfully.
Basically I need to know how to work with this new virtual network, and fix the service discovery and load balancing without using any extra stuff.

Answer 1

Took me some time to figure it out as well...
You need to:
Remove all ports assignment in the task definition
Describe the name of the network to attach to (default network created is named "dcos")
{
"id": "yourtask",
"container": {
"type": "DOCKER",
"docker": {
"image": "your/image",
"network": "USER"
}
},
"acceptedResourceRoles" : [
"slave_public"
],
"ipAddress": {
"networkName": "dcos"
},
"instances": 2,
"cpus": 0.2,
"mem": 128
}