sshcont

spawn throwaway systemd or non-systemd based docker containers using ssh.

Usage:

sshcont:
  -bind string
        bind address, 127.0.0.1:2222, use :2222 for all (default "127.0.0.1:2222")
  -cmd string
        Execute cmd after login, example: ls
  -endpoint string
        Docker endpoint. Default: use environment settings. Example: tcp://192.168.1.100:2375
  -export string
        Before removing, export container contents to specified directory, example: /tmp/
  -image string
        Force image to be executed
  -vol string
        Share volume into container, example: /home/:/home_shared

after starting the service, use the following ssh command to start and enter an container:

 ssh -l "jrei/systemd-debian" -o StrictHostKeychecking=no localhost -p 2222
 root@89fb0de78a12:/

or likewise:

RHEL:
 ssh -l "registry.access.redhat.com/ubi9/ubi-init:latest" -o StrictHostKeychecking=no localhost -p 2222
 root@89fb0de78a14:/
SLES:
 ssh -l "registry.suse.com/bci/bci-init:15.6" -o StrictHostKeychecking=no localhost -p 2222
 root@89fb0de78a15:/

regular:

ssh -l "debian:bookworm" -o StrictHostKeychecking=no localhost -p 2222
 root@89fb0de78a16:/
ssh -l "alpine:latest" -o StrictHostKeychecking=no localhost -p 2222
 root@89fb0de78a17:/

Executing scripts for CI testing

Execute predefined script by using the cmd option:

 cat /tmp/ci/test.sh
 #!/bin/bash
 exit 1

 sshcon -vol /tmp/ci:/ci -cmd /ci/test.sh
 user@host: ~ $ ssh -l "debian:bookworm" -o StrictHostKeychecking=no localhost -p 2222
 Connection to localhost closed.
 user@host: ~ $ echo $?
 1

on multiple containers:

for dist in $(echo "debian:bookworm" "debian:buster" "debian:bullseye"
"alpine:latest" "registry.suse.com/bci/bci-init:15.6"); do
    ssh -l "$dist" -o StrictHostKeychecking=no localhost -p 2222;
done

or directly execute a command via ssh call:

 ssh -l "debian:bookworm" -o StrictHostKeychecking=no localhost -p 2222 ls; echo $?
 bin   dev  home  lib64  mnt  proc  run   srv  tmp  var
 boot  etc  lib   media  opt  root  sbin  sys  usr
 0

Notes:

• No authentication implemented, you should not run this on a public network interface.
• Container images not available on the host will be pulled.
• Container is removed after exiting the session.

Why?

• I know containerssh exists, but it brings way too much features i dont need.
• Sometimes i work on systems where docker is not available but need quick access to an container for testing.