Docker registry service only binds to 127.0.0.1 and not localhost

Docker Engine Swarm
1

I have setup 3 vagrant ubuntu (bento/ubuntu-16.04) nodes within the same private network.

On both nodes I have installed docker.

I have tested connectivity on all ports for swarm mode and the nodes can communicate with each other (tcp/udp).

Now I made one node the manager node. I have been following the following tutorial:

When setting up a registry service like:

docker service create --name registry --publish 5000:5000 registry:2

and doing:

docker service ls

I have the following output:

ID                  NAME                MODE                REPLICAS            IMAGE               PORTS
z2vbuuihk0wz        registry            replicated          1/1                 registry:2          *:5000->5000/tcp

As you can see the registry is published to all ip’s on port 5000.

Now when I do:

curl http://localhost:5000/v2/

It won’t show me the curly braces as in the example. It just hangs.

However when I do:

curl http://127.0.0.1:5000/v2/

It does show me the curly braces.

When I ping localhost it resolves to 127.0.0.1.

My vagrantfile is just the standard one and I just added:

config.vm.provider "virtualbox" do |vb|
 vb.customize ["modifyvm", :id, "--memory", "2048"]
 vb.customize ["modifyvm", :id, "--cpus", "2"]
 vb.customize ["modifyvm", :id, "--natdnsproxy1", "on"]
 vb.customize ["modifyvm", :id, "--natdnshostresolver1", "on"]
 vb.customize ["modifyvm", :id, "--ostype", "Ubuntu_64"]
end

The following:

docker service inspect --pretty registry

gives:

ID:             z2vbuuihk0wzby13ir23f98eo
Name:           registry
Service Mode:   Replicated
 Replicas:      1
Placement:
UpdateConfig:
 Parallelism:   1
 On failure:    pause
 Monitoring Period: 5s
 Max failure ratio: 0
 Update order:      stop-first
RollbackConfig:
 Parallelism:   1
 On failure:    pause
 Monitoring Period: 5s
 Max failure ratio: 0
 Rollback order:    stop-first
ContainerSpec:
 Image:         registry:2@sha256:f5552e60ffd56fecbe2f04b61a3089a9cd755bd9352b6b5ab22cf2208af6a3a8
Resources:
Endpoint Mode:  vip
Ports:
 PublishedPort = 5000
  Protocol = tcp
  TargetPort = 5000
  PublishMode = ingress

When doing:

curl http://{node_ip}:5000/v2/

it also gives me the curly braces. My question is. Does anyone know why I don’t get the curly braces when using localhost.