Log in to a Broker UAI

SSH to log into a Broker UAI and reach the End-User UAIs on demand.

Prerequisites

  • The user must be logged into a host that can reach the external IP address of the Broker UAI
  • The user must know the external IP address or DNS host name of the Broker UAI

Procedure

  1. Log in to the Broker UAI.

    The following example is the first login for the vers user:

    vers> ssh vers@35.226.246.154
The authenticity of host '35.226.246.154 (35.226.246.154)' can't be established.
ECDSA key fingerprint is SHA256:k4ef6vTtJ1Dtb6H17cAFh5ljZYTl4IXtezR3fPVUKZI.
Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
Warning: Permanently added '35.226.246.154' (ECDSA) to the list of known hosts.
Password:
Creating a new UAI...

The authenticity of host '10.21.138.52 (10.21.138.52)' can't be established.
ECDSA key fingerprint is SHA256:TX5DMAMQ8yQuL4YHo9qFEJWpKaaiqfeSs4ndYXOTjkU.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '10.21.138.52' (ECDSA) to the list of known hosts.

    There are several things to notice here:

    • The first time the user logs in the Broker UAI’s SSH host key is unknown, as is normal for SSH.
    • The user is asked for a password in this example. If the user’s home directory, as defined in LDAP had been mounted in the Broker UAI and a .ssh/authorized_keys entry had been present, there would not have been a password prompt. Home directory trees can be mounted as volumes just as any other directory can.
    • The broker mechanism in the Broker UAI creates a new UAI because vers has never logged into this Broker UAI before.
    • There is a second prompt to acknowledge an unknown host which is, in this case, the End-User UAI itself. The Broker UAI constructs a public/private key pair for the hidden SSH connection between the broker and the End-User UAI shown in the image in Broker Mode UAI Management.

  2. Log out of the Broker UAI.

  3. Log in to the Broker UAI again.

    The next time vers logs in, it will look similar to the following:

    vers> ssh vers@35.226.246.154
Password:
vers@uai-vers-ee6f427e-6c7468cdb8-2rqtv>

    Only the password prompt appears now, because the hosts are all known and the End-User UAI exists but there is no .ssh/authorized_keys known yet by the Broker UAI for vers.

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