SSH

After tinkering with the Raspi, I decided to try to learn a bit of  SSH, and though what I've learned is basic and limited to the LAN, it's enough for the moment.

One thing I've learned is that anything that can be done in terminal can be done with SSH, since it's accessing another machine with a runlevel 3 interface.

Last night, I decided to boot openSUSE 13.2 to runlevel 3 on Triela and try to SSH into her to run updates, but I had no such luck; I tried again with Lie-chan a couple hours ago and still had the same problem.

After poking around on the net, I found the problem. The first was that the firewall was blocking SSH (port 22), and the second was that the daemon wasn't running or set to run on boot.

Once I get the chance to (probably tonight when I update Melty), I'll be able to boot any machine to runlevel 3 and remotely update it and shut it down.

Oh, when I was tinkering with the Raspi, I sent a halt signal (sudo halt) which wasn't the best idea, since the terminal session hung - oops! I found out a couple hours ago with Triela that I should type sudo init 6 to reboot, and with Lie-chan I sent sudo init 0 with SSH to shut her down. Sending init 0 over SSH to the target machine does a proper shutdown which then sends a logout signal to the SSH client from the target machine, making it a much cleaner experience.

I tried to SSH into Taiga, but found that I was unable to since the dependencies for openssh-server were broken, so the server wasn't installed. I'll see if there's a way to fix it, though I think Debian PowerPC might make it problematic.


Things I've learned:

• Check to make sure SSH daemon is running/scheduled to run on boot
• Check to make sure firewall doesn't block incoming SSH signals
• Use sudo init 0 to shut down machine instead of sudo halt
• SSH is quite useful and I should have taken the time to learn it earlier