Hyper V Com Port Named Pipe
I have a Hyper-V guest running CentOS 7. When the guest panics and prints a kernel Oops message, is it possible to capture the text written to the console? Note that the message is not written to dmesg, and thus, cannot be retrieved on the next reboot.
Allows you to connect a com port to a named pipe but how do you create these named pipes? My Computer System One. Charlie Russel - MVP. Mar 4, 2009 #2 You can't connect a modem to the virtual COM port that Hyper-V creates. You'll need a third party product, such as FabulaTech, to do what you want. The Set-VMComPort cmdlet configures the COM port of a virtual machine. PS C: Set-VMComPort TestVM 2. Pipe TestPipe. Configure the second COM port on virtual machine TestVM to connect to named pipe TestPipe on the local computer.
ctufflictuffli1 Answer
To add a serial port to a VM, create one (or more) named pipes in PowerShell. Note that PowerShell must be 'run as administrator' for this to work. The example here uses a VM named dv0.
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In the Linux VM, add the console setting via grubby for COM1 (a.k.a. ttyS0):
PuTTY can capture the output from the named pipe. In the session options, use Serial for the destination, .pipedv0-com1 for the Serial line, and 115200 for the Speed to match the Linux console settings. Because the named pipes are created as Administrator, PuTTY must also be 'run as administrator'.
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Hyperv.com Port Named Pipe In Texas
I would like to redirect the serial port output on RedHat 5.7 to some recordable or reviewable medium.
The normal way to do this on a physical machine is to add the console parameters to the kernel in grub like what's below, connect it to another machine via a serial port and null modem cable and use minicom, hyperterminal or TeraTerm with matching settings, which would enable viewing the console startup messages on the machine and debug output if the kernel crashes (and log them to a file in the case of Tera Term).
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kernel /vmlinuz-2.6.18-274.el5 ro root=/dev/VolGroup00/LogVol00 rhgb quiet crashkernel=128M@16M console=tty0 console=ttyS0,38400 hda=noprobe hdb=noprobe
In VMWare ESX I could do something similar, where the serial port can be redirected to a file giving me the same effect.
Hyper-V redirects serial output to a named pipe, no file option.
Is there a program that I can run on the Hyper-V hypervisor that lets me capture the named pipe to a file? (Could I do this with HyperTerminal or TeraTerm somehow?) Or would I have to write a program from scratch to accomplish this?
HopelessN00b1 Answer
Under Windows 10
- Run PuTTY as administrator
- In the session options, select Serial
- Set the Serial Line to the named pipe, e.g.
.pipemy_named_pipe - Set the Speed to something faster if desired