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Guides

Debian SSH server

This guide explains how to create and deploy a Debian app with SSH enabled. To run this example, follow these steps:

1. Install the CLI and a container runtime engine, for example Docker. Use the unikraft CLI or the legacy kraft CLI.

2. Clone the examples repository and cd into the examples/debian-ssh directory:

Code
git clone https://github.com/unikraft-cloud/examples
cd examples/debian-ssh/

Make sure to log into Unikraft Cloud and pick a metro close to you. This guide uses fra (Frankfurt, 🇩🇪):

When done, invoke the following command to deploy this app on Unikraft Cloud:

The output shows the instance address and other details:

Code
[●] Deployed successfully!
 │
 ├─────── name: debian-ssh-2uwg5
 ├─────── uuid: b3d158c5-fb52-4685-a76b-2497973308dc
 ├────── metro: https://api.fra.unikraft.cloud/v1
 ├────── state: starting
 ├───── domain: nameless-cherry-sw2e9ul2.fra.unikraft.app
 ├────── image: debian-ssh@sha256:2442b4d5e078e7bc9ccd887fac65623511551592315d341a219f34a2c6628949
 ├───── memory: 1024 MiB
 ├──── service: nameless-cherry-sw2e9ul2
 ├─ private ip: 10.0.0.109
 └─────── args: /usr/bin/wrapper.sh

In this case, the instance name is debian-ssh-2uwg5 and the address is nameless-cherry-sw2e9ul2.fra.unikraft.app. They're different for each run.

You need to set up a tunnel that handles the TLS connection to the Unikraft Cloud instance. This way, you have a non-TLS port that your SSH client can connect to:

Code
socat TCP-LISTEN:2222,reuseaddr,fork OPENSSL:nameless-cherry-sw2e9ul2.fra.unikraft.app:2222,verify=0

Then connect to the instance via SSH using:

Code
ssh -l root localhost -p 2222

You might see warnings like REMOTE HOST IDENTIFICATION HAS CHANGED. This is normal if you have set up tunnels to connect with SSH on localhost, so don't worry.

You can list information about the instance by running:

Code
NAME              FQDN                                       STATE    STATUS       IMAGE                      MEMORY   VCPUS  ARGS                 BOOT TIME
debian-ssh-2uwg5  nameless-cherry-sw2e9ul2.fra.unikraft.app  running  since 5mins  debian-ssh@sha256:2442...  1.0 GiB  1      /usr/bin/wrapper.sh  217.26 ms

When done, you can remove the instance:

Learn more

Use the --help option for detailed information on using Unikraft Cloud:

Or visit the CLI Reference or the legacy CLI Reference.