SSH connection to Azure VM with Terraform

Question

I have successfully created a VM as part of a Resource Group on Azure using Terraform. Next step is to ssh in the new machine and run a few commands. For that, I have created a provisioner as part of the VM resource and set up an SSH connection:

resource "azurerm_virtual_machine" "helloterraformvm" {
    name = "terraformvm"
    location = "West US"
    resource_group_name = "${azurerm_resource_group.helloterraform.name}"
    network_interface_ids = ["${azurerm_network_interface.helloterraformnic.id}"]
    vm_size = "Standard_A0"

    storage_image_reference {
        publisher = "Canonical"
        offer = "UbuntuServer"
        sku = "14.04.2-LTS"
        version = "latest"
    }


    os_profile {
        computer_name = "hostname"
        user     = "some_user"
        password = "some_password"
    }

    os_profile_linux_config {
        disable_password_authentication = false
    }

    provisioner "remote-exec" {
        inline = [
          "sudo apt-get install docker.io -y"
        ]
        connection {
          type     = "ssh"
          user     = "some_user"
          password = "some_password"
        }
    }

}

If I run "terraform apply", it seems to get into an infinite loop trying to ssh unsuccessfully, repeating this log over and over:

azurerm_virtual_machine.helloterraformvm (remote-exec): Connecting to remote host via SSH...
azurerm_virtual_machine.helloterraformvm (remote-exec):   Host:
azurerm_virtual_machine.helloterraformvm (remote-exec):   User: testadmin
azurerm_virtual_machine.helloterraformvm (remote-exec):   Password: true
azurerm_virtual_machine.helloterraformvm (remote-exec):   Private key: false
azurerm_virtual_machine.helloterraformvm (remote-exec):   SSH Agent: true

I'm sure I'm doing something wrong, but I don't know what it is :(

EDIT:

I have tried setting up this machine without the provisioner, and I can SSH to it no problems with the given username/passwd. However I need to look up the host name in the Azure portal because I don't know how to retrieve it from Terraform. It's suspicious that the "Host:" line in the log is empty, so I wonder if it has anything to do with that?

UPDATE:

I've tried with different things like indicating the host name in the connection with

host = "${azurerm_public_ip.helloterraformip.id}" 

and

host = "${azurerm_public_ip.helloterraformips.ip_address}"

as indicated in the docs, but with no success.

I've also tried using ssh-keys instead of password, but same result - infinite loop of connection tries, with no clear error message as of why it's not connecting.

Answer 1

I have managed to make this work. I changed several things:

• Gave name of host to connection.
• Configured SSH keys properly - they need to be unencrypted.
• Took the connection element out of the provisioner element.

Here's the full working Terraform file, replacing the data like SSH keys, etc.:

# Configure Azure provider
provider "azurerm" {
  subscription_id = "${var.azure_subscription_id}"
  client_id       = "${var.azure_client_id}"
  client_secret   = "${var.azure_client_secret}"
  tenant_id       = "${var.azure_tenant_id}"
}

# create a resource group if it doesn't exist
resource "azurerm_resource_group" "rg" {
    name = "sometestrg"
    location = "ukwest"
}

# create virtual network
resource "azurerm_virtual_network" "vnet" {
    name = "tfvnet"
    address_space = ["10.0.0.0/16"]
    location = "ukwest"
    resource_group_name = "${azurerm_resource_group.rg.name}"
}

# create subnet
resource "azurerm_subnet" "subnet" {
    name = "tfsub"
    resource_group_name = "${azurerm_resource_group.rg.name}"
    virtual_network_name = "${azurerm_virtual_network.vnet.name}"
    address_prefix = "10.0.2.0/24"
    #network_security_group_id = "${azurerm_network_security_group.nsg.id}"
}

# create public IPs
resource "azurerm_public_ip" "ip" {
    name = "tfip"
    location = "ukwest"
    resource_group_name = "${azurerm_resource_group.rg.name}"
    public_ip_address_allocation = "dynamic"
    domain_name_label = "sometestdn"

    tags {
        environment = "staging"
    }
}

# create network interface
resource "azurerm_network_interface" "ni" {
    name = "tfni"
    location = "ukwest"
    resource_group_name = "${azurerm_resource_group.rg.name}"

    ip_configuration {
        name = "ipconfiguration"
        subnet_id = "${azurerm_subnet.subnet.id}"
        private_ip_address_allocation = "static"
        private_ip_address = "10.0.2.5"
        public_ip_address_id = "${azurerm_public_ip.ip.id}"
    }
}

# create storage account
resource "azurerm_storage_account" "storage" {
    name = "someteststorage"
    resource_group_name = "${azurerm_resource_group.rg.name}"
    location = "ukwest"
    account_type = "Standard_LRS"

    tags {
        environment = "staging"
    }
}

# create storage container
resource "azurerm_storage_container" "storagecont" {
    name = "vhd"
    resource_group_name = "${azurerm_resource_group.rg.name}"
    storage_account_name = "${azurerm_storage_account.storage.name}"
    container_access_type = "private"
    depends_on = ["azurerm_storage_account.storage"]
}



# create virtual machine
resource "azurerm_virtual_machine" "vm" {
    name = "sometestvm"
    location = "ukwest"
    resource_group_name = "${azurerm_resource_group.rg.name}"
    network_interface_ids = ["${azurerm_network_interface.ni.id}"]
    vm_size = "Standard_A0"

    storage_image_reference {
        publisher = "Canonical"
        offer = "UbuntuServer"
        sku = "16.04-LTS"
        version = "latest"
    }

    storage_os_disk {
        name = "myosdisk"
        vhd_uri = "${azurerm_storage_account.storage.primary_blob_endpoint}${azurerm_storage_container.storagecont.name}/myosdisk.vhd"
        caching = "ReadWrite"
        create_option = "FromImage"
    }

    os_profile {
        computer_name = "testhost"
        admin_username = "testuser"
        admin_password = "Password123"
    }

    os_profile_linux_config {
      disable_password_authentication = false
      ssh_keys = [{
        path     = "/home/testuser/.ssh/authorized_keys"
        key_data = "ssh-rsa xxx [email protected]"
      }]
    }

    connection {
        host = "sometestdn.ukwest.cloudapp.azure.com"
        user = "testuser"
        type = "ssh"
        private_key = "${file("~/.ssh/id_rsa_unencrypted")}"
        timeout = "1m"
        agent = true
    }

    provisioner "remote-exec" {
        inline = [
          "sudo apt-get update",
          "sudo apt-get install docker.io -y",
          "git clone https://github.com/somepublicrepo.git",
          "cd Docker-sample",
          "sudo docker build -t mywebapp .",
          "sudo docker run -d -p 5000:5000 mywebapp"
        ]
    }

    tags {
        environment = "staging"
    }
}