How to enable SSH access for an AlmaLinux 9 devcontainer?

[esthezia]

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Hi!

I'm new to GitHub Codespaces, and I've created my first dev container. I am trying to add SSH access to it, from my computer. I've installed openssh-server, set up my devcontainer.json like this:

{
    "build": {
        "dockerfile": "Dockerfile"
    },
    "elevateIfNeeded": true,
    "forwardPorts": [22],
    "init": true,
    "features": {
        "ghcr.io/devcontainers/features/git:1": {},
        "ghcr.io/devcontainers/features/node:1": {
            "nodeGypDependencies": false
        }
    }
}

with Dockerfile:

FROM almalinux:9

RUN dnf update -y && dnf install -y openssh-server && systemctl enable --now sshd

CMD ["/bin/bash"]

But the systemctl command says

System has not been booted with systemd as init system (PID 1). Can't operate.
Failed to connect to bus: Host is down

I suppose this can be done, as there are options in the documentation for this, I just don't know how to set it up -- can anyone help?

Thank you!

[esthezia]

Hi @Aqib121201!

Thank you so much for the answer! How can I validate that sshd in indeed running? Because when I run sudo ps aux (after installing procps) it doesn't show sshd.

Because when I try to login, I get Connection timed out.

I tried with ssh -p 2222 dev@jubilant-dollop-xp....wx-2222.app.github.dev, as well as with
ssh -p 2222 -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -o GlobalKnownHostsFile=/dev/null dev@jubilant-dollop-xp....wx-2222.app.github.dev

Another thing. What do you mean by "running ssh dev@localhost with port 2222 if you are attached locally"? Can I ssh connect to the host machine somehow? Because I am not aware of being able to ssh into anything else other than the container. Attached locally, how?!

Before moving to GitHub CLI's Codespaces SSH support, I want to explore this further, as it sesms it has to work!

Thank you!

[esthezia]

Ok, I have managed to connect to my codespace with gh codespace ssh -c "jubila.....wx" --server-port 2222, but the command

gh codespace cp -e -c "jubil......wx" image.png remote:/workspaces/$RepositoryName/

errors out:

D:\work>gh codespace cp -e -c "jubi.......wx" image.png remote:/workspaces/$RepositoryName/
subsystem request failed on channel 0
C:\Windows\System32\OpenSSH\scp.exe: Connection closed
shell closed: exit status 255

Any idea why?

[esthezia]

Indeed it works now! The only thing that doesn't work is the expansion of $RepositoryName in the command, even with the -e flag. I have to use the literal name of the repository.

Anyway, Thank you so much! That was great! :)