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You can connect for the first time via SSH from another ECMWF platform.

$> ssh aa-login
# or for users with no formal access to HPC service:
$> ssh ecs-login

See also HPC2020: Persistent interactive job with ecinteractive if you wish to customise the resource limits of your interactive session.

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Host aa-login aa-login.ecmwf.int ecs-login ecs-login.ecmwf.int
    User yourusername
    ForwardX11 yes
    ForwardX11Timeout 0
    ServerAliveInterval 60
    TCPKeepAlive yes
    # Temporary extra jump through ecgate until direct access is sorted
    ProxyJump shell.ecmwf.int,ecgate

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1. Check if you have an existing ssh key pair on other ECMWF platforms:

   No Format
   $> ls ~/.ssh/id_* ~/.ssh/id_rsa ~/.ssh/id_rsa.pub

   If you don't, you may generate them like so:

   No Format
   $> ssh-keygen # press 'enter' 3 more times

   
   

2. Make sure it is added into the different platforms to be used

   Note
   If the key was already present in the ~/.ssh/authorized_keys file, it will be duplicated.

   
   

   No Format
   $> ssh-copy-id -i ~/.ssh/id_rsa.pub ecgate $> ssh-copy-id -i ~/.ssh/id_rsa.pub cca $> ssh-copy-id -i ~/.ssh/id_rsa.pub aa-login # or for users with no formal access to HPC service: $> ssh-copy-id -i ~/.ssh/id_rsa.pub ecs-login

   
   

3. Copy also your private key onto those platforms so you can make the connections in both directions:

   No Format
   $> rsync -av ~/.ssh/id_rsa cca:.ssh/ $> rsync -av ~/.ssh/id_rsa aa-login:.ssh/ # or for users with no formal access to HPC service: $> rsync -av ~/.ssh/id_rsa ecs-login:.ssh/