title: Connecting docker-machine to Azure using the generic driver
body: <p>I have a Docker-based deployment on Azure. I know that docker-machine has a Azure driver, which can create VMs and generate the certs, etc.. But I'd rather use the Azure tools (CLI and portal). </p>
  
  <p>So I created a VM, and installed my public SSH key on it. And now I'd like to connect to it using docker-machine. I add the server, so that I can see it when I do <code>docker-machine ls</code>:</p>
  
  <pre><code>NAME        ACTIVE   DRIVER       STATE     URL                        SWARM   DOCKER    ERRORS
  default     -        virtualbox   Stopped                                      Unknown
  serv        -        generic      Running   tcp://XX.XX.XX.XX:2376             Unknown   Unable to query docker version: Unable to read TLS config: open /Users/user/.docker/machine/machines/serv/server.pem: no such file or directory
  </code></pre>
  
  <p>When I try to set the environment variables, I see this:</p>
  
  <pre><code>$ docker-machine env serv
  Error checking TLS connection: Error checking and/or regenerating the certs: 
  There was an error validating certificates for host "XX.XX.XX.XX:2376": 
  open /Users/user/.docker/machine/machines/serv/server.pem: no such file or directory
  You can attempt to regenerate them using 'docker-machine regenerate-certs [name]'.
  Be advised that this will trigger a Docker daemon restart which will stop running containers.
  </code></pre>
  
  <p>When I try to regennerate-certs, I get:</p>
  
  <pre><code>$ docker-machine regenerate-certs serv
  Regenerate TLS machine certs?  Warning: this is irreversible. (y/n): y
  Regenerating TLS certificates
  Waiting for SSH to be available...
  Detecting the provisioner...
  Something went wrong running an SSH command!
  command : sudo hostname serv &amp;&amp; echo "serv" | sudo tee /etc/hostname
  err     : exit status 1
  output  : sudo: no tty present and no askpass program specified
  </code></pre>
  
  <p>I can SSH to the server fine. </p>
  
  <p>What's the issue here? How can I make it work?</p>