Using SSH keys

One of the ways Platform.sh keeps things secure is by using SSH behind the scenes. Users can interact with their environment through a command shell, or push changes to the environment's Git repository, and both of these features rely on SSH.

When you create a new project, the wizard will propose that you add your ssh key.

Setting Up Your Project Add SSH Key Done

You can also manage SSH keys through the CLI (see below), or through the settings screen on your account page.

Find your Public-Private Keypair

If you use Linux, you probably already have keys. The private key is usually in a file named ~/.ssh/id_rsa and the public key in ~/.ssh/id_rsa.pub,

Searching for a public key file:

  1. Open up a command prompt.
  2. run the following commands:
    $ cd ~/.ssh
    $ ls -a
    id_rsa
    id_rsa.pub
    known_hosts
    authorized_keys
    

If you find a file named either id_rsa.pub or id_dsa.pub, you can use it with Platform.sh. If you don't find an existing key, see the steps to create a new one in the next section.

Create a New Public-Private Keypair

note If you already have a SSH keypair, you can skip this step.

Create a public-private keypair:

$ ssh-keygen -t rsa -C "your_email_address@example.com"

ssh-keygen generates the key pair and will ask you where you want to save the file:

Generating public/private rsa key pair.
Enter file in which to save the key (/Users/your_username/.ssh/id_rsa):

The default location is fine in most cases. Now it's time to create a passphrase. A good, strong passphrase is highly recommended, to make your key less useful if it falls into the wrong hands.

Enter passphrase (empty for no passphrase): [Type a passphrase]
Enter same passphrase again: [Type passphrase again]

That's it. Keys generated! Here are the results:

Your identification has been saved in /Users/your_username/.ssh/id_rsa.
Your public key has been saved in /Users/your_username/.ssh/id_rsa.pub.
The key fingerprint is:
55:c5:d7:a9:1f:dc:7a:67:31:70:fd:87:5a:a6:d0:69 your_email_address@example.com

note Make note of the location of your public key, you're going to need that in the next section.

Add the SSH key to your Platform account

You have your SSH keys (if not, take a look at the section above), but you need to make sure Platform has a copy of your public key. It's pretty easy to add it to your account.

  1. First off, you'll need to copy your public key to the clipboard.
  2. Head over to your user account page on the Platform.sh Accounts page and navigate to the SSH Keys tab.
  3. Click on the Add a public key link.
  4. Paste the key that you copied earlier into the 'Key' text box. You can also add a title if you like, otherwise it will be auto-generated.
  5. Click 'Save'.

That's it! You're all set. Now you'll be able to use Git and command shells with any Platform.sh environment that your user account is authorized to work with.

Edit Account Ssh

SSH to your Web Server

In the Web Interface, just under the environment name, there is a link you can hover over to copy the SSH URL of that environment:

Image of an environment's access information in the web interface

  1. Open your Platform.sh Web Interface
  2. Hover over the Access info link
  3. Click to copy the SSH URL
  4. Open a terminal
  5. Paste the link into your terminal

You should see something like this:

$ ssh wk5fqz6qoo123-master@ssh.eu.platform.sh

   ___ _      _    __
  | _ \ |__ _| |_ / _|___ _ _ _ __
  |  _/ / _` |  _|  _/ _ \ '_| '  \
  |_| |_\__,_|\__|_| \___/_| |_|_|_|

 Welcome to Platform.

 This is environment master
 of project wk5fqz6qoo123.

web@wk5fqz6qoo123-master--php:~$

Troubleshoot SSH

While trying to log in via SSH, this can happen:

$ ssh [SSH-URL]
Permission denied (publickey).

Don't panic! It's an issue which can happen for the following reasons:

  • Your environment is inactive
  • You haven't rebuilt (i.e. git push) your environment since adding the new public key
  • You didn't upload your public key to your user profile
  • Your SSH private key has not been added into your ssh-agent

Check your public key

Make sure your public key has been uploaded to your user account.

Check your ssh-agent

Check that your key is properly added to your SSH agent. This is an authentication agent that manages your private key.

  1. Check your SSH agent. Run the command ssh-add -l in your terminal:

    $ ssh-add -l
    2048 12:b0:13:83:7f:56:18:9b:78:ca:54:90:a7:ff:12:69 /Users/nick/.ssh/id_rsa (RSA)
    
  2. Check that file name on the right (.ssh/id_rsa in the example above). Does it match your private key file?

  3. If you don't see your private key file, add your private key:

    $ ssh-add path-to-your-key
    
  4. Try again.

Still having trouble?

If you followed all the steps above, you may also notice an error message similar to below while attempting to ssh to platform.sh:

Hello Your Name, you successfully connected, but you do not have access to service 'xxxxxxxxxxxxxx-master': check permissions.
Received disconnect from 54.210.49.244: 14: No more auth methods available

This usually means a deployment has not been committed yet. When a new key is added, it only becomes immediately active for use with Git. For use with ssh, it will not be activated until a deployment is made. An easy way to force this is to create and push an empty commit:

$ git commit --allow-empty -m 'force redeploy'
$ git push origin master

If all else fails, generate some SSH debug information

If your private key and public key both look OK but you don't have any luck logging in, print debugging information. These lines often give clues about what is going wrong.

  1. Run the SSH command with the -v option, like this:

    $ ssh -v [SSH-URL]
    OpenSSH_6.7.8, OpenSSL 1.2.3 1 Sep 2014
    debug1: Connecting to ssh.eu.platform.sh [54.32.10.98] port 22.
    debug1: Connection established.
    debug1: identity file /Users/nick/.ssh/id_rsa type 1
    ...(30 more lines of this light reading)...
    debug1: Offering RSA public key: /Users/nick/.ssh/id_rsa
    debug1: Authentications that can continue: publickey
    debug1: No more authentication methods to try.
    Permission denied (publickey).
    $
    

You can use this information to make one last check of the private key file.

If you're still stuck, don't hesitate to submit a support ticket, we'll help you solve your problem.

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