Terraform Docker provider gives me a "Unsupported protocol error"

[Eric B]

I'm trying to set up a Terraform / Docker testbed and running into some issues.  I'm new to both the Terraform and Docker worlds, so not entirely sure which is at "fault" here.

I have a CentOS7 server up and running with my docker engine running.  Running "docker run hello-world" outputs the expected Hello World.

However, when I try to launch a simple container using Terraform, I get the following error:

Eric-MacBook-Pro:bin eric$ ./terraform plan

Refreshing Terraform state in-memory prior to plan...
The refreshed state will be used to calculate this plan, but will not be
persisted to local or remote state storage.

Error refreshing state: 1 error(s) occurred:

* Post : unsupported protocol scheme ""
Eric-MacBook-Pro:bin eric$

My .tf file has minimal config:

# Configure the Docker provider

provider "docker" {
   host = "tcp://192.168.2.215:2376/"

}

# Create a container

resource "docker_container" "foo" {

   image = "${docker_image.ubuntu.latest}"

   name = "foo"

}

resource "docker_image" "ubuntu" {

    name = "ubuntu:latest"

}

What am I doing wrong?  What is generating the unsupported protocol scheme?  I suspect it might be a communication error, but not sure what.  I've disabled the firewall on the CentOS box, just in case something was being blocked there.

On CentOS, I don't actually see the dockerd listening to port 2376; is there something special I need to do to enable that part:

netstat -ap | grep dock

unix  2      [ ACC ]     STREAM     LISTENING     31251    4704/dockerd         /var/run/docker.sock
unix  2      [ ACC ]     STREAM     LISTENING     31268    4707/docker-contain  /var/run/docker/libcontainerd/docker-containerd.sock
unix  2      [ ACC ]     STREAM     LISTENING     31430    4704/dockerd         /run/docker/libnetwork/0428d67a86e673e1177ceae7a2e8956cf9a6d9d64c164d8d8df5828d4b276d72.sock
unix  3      [ ]         STREAM     CONNECTED     31244    4704/dockerd        
unix  2      [ ]         DGRAM                    31249    4704/dockerd        
unix  3      [ ]         STREAM     CONNECTED     31272    4707/docker-contain  /var/run/docker/libcontainerd/docker-containerd.sock

Thanks,

Eric

[Lowe Schmidt]

Have you tried setting the host to the unix socket path? 

Something like unix:///var/run/docker.sock 

(For reference https://github.com/hashicorp/terraform/issues/4923)

--

Lowe Schmidt | +46 723 867 157

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