IP KVM Tunneling
To use a VNC through a tunnel, one of the following commands must be issued More information needed...
/usr/local/bin/stunnel -f -c -d 5900 -r kvm.hcoop.net:15900
ssh email@example.com -L 5900:`dig +short kvm.hcoop.net`:5900
Then use your favorite VNC client to connect to localhost:5900.
Note that the second command uses a numeric IP address because the KVM does not have a DNS server set. We don't want to set the DNS server, because we'd almost certainly forget to update it if it ever changed -- simplest to just run without one.
One known-good VNC client program is xtightvncviewer. After establishing a tunnel, a VNC connection using it may be established as follows.
xtightvncviewer -bgr233 localhost
Once connected, you will be "looking through" an IP KVM which is connected to a KVM Switch (these are different devices!). By pressing scroll lock twice and then the up or down arrow (ie SCRL SCRL UP or SCRL SCRL DOWN) you can switch between the various machines connected to the KVM Switch. Currently there are two: deleuze and mire.
To access the serial port, use one of the following:
ssh -t firstname.lastname@example.org tip /dev/tts/0
ssh -t email@example.com tip /dev/tts/1
One command corresponds to each of the two serial port connectors on the KVM (we're not sure which is which). After executing the command above, your ssh session will give you a console on the chosen serial port (which is probably connected to the remote power-cycling machinery of one of the servers)
To change the password to the KVM, ssh to firstname.lastname@example.org and do two things:
This will run the KVM vendor's setup program. Don't forget to choose the "Write configuration changes" option when you're done with setup! This will cause the KVM to reboot, so do not be alarmed if you get disconnected.
Log into kvm.hcoop.net with the secret password.
You can then click on the screen to launch the a Java applet, or you can connect with a vnc client natively if the applet is too slow on your system.
The screen will probably be blanked; press a key to refresh the screen.
1. KVM Channels
- 1: deleuze
- 3: mire
- 7: fritz
- 8: hopper
2. Switching Between KVM Channels
To switch between screens use the sequence Scrl Lock, Scrl Lock, followed by the Up or Down key.
You cannot press the keyboard Scroll Lock button. Instead, click on the [S] button twice. Before you click, mouse over the [S] and ensure that it is highlighted as below.
A caption with the channel number should appear in the upper left corner of the screen as pictured below. Now press Up or Down to change the active channel.
3. Sending Magic SysRq Key
Open the keys menu and toggle Left Alt
Then send PrintScrn + command key using your physical keyboard.