Terminology
Machine #1, for these instructions, will be running Windows or Linux
and will run a terminal program from which we will control the
installation on Machine #2.
Machine #2, for these instructions, is the machine where we will be
installing Linux to, but we will be controlling the install through the
serial port.Step 1. Attach the Null Modem Cable
The first step is to attach the null modem cable between the serial ports of Machine #1 and Machine #2.
TERMINOLOGY
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STEP2
STEP3
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REFERENCE
Step 2. Set up the Terminal Program on Machine #1:
On the system you are controlling the install (Machine #1), type the following:
For Linux:
miterm -s 9600 -l /dev/ttyS0
If you want to capture output of the installation then use the script command:
script
miterm -s 9600 -l /dev/ttyS0
exit
Note: minicom, kermit, and others should work just as well as miterm.
For Windows:
HyperTerminal 9600, 8, N, 1
HyperTerminal can capture output if you need it to.
Other terminal programs will work as well.
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STEP2
STEP3
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Step 3. Begin the Linux Install on Machine #2:
At the RedHat Installer Boot Prompt, type one of the following lines:
linux console=ttyS0,9600
or
linux serial
or
linux console=tty0 console=ttyS0,9600
If you watch closely (and you have a monitor and video card on Machine
#2) you will see a couple of lines show up on Machine #2, but all
following lines will show up through the serial port to the terminal on
Machine #1. This behavior is normal.
On a headless machine (a machine without a video card nor monitor), you
can modify one of the boot disks found in the /images directory on the
RedHat CD. Create the floppy, then find the file named syslinux.cfg and
add the console=... parameters there. Then when you boot the headless
machine on that floppy you will be able to control the install through
the serial port.
You can make the serial port the permanent default console by reading up on serial-console.txt
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Notes
The script program allows you to capture output from a program by
logging everything to a log file. You finish running the script program
by typing exit - you will then see a message stating that your log file
has been saved.
Another way of running a program and controlling it through the serial
port (useful for capturing screens when script and other programs are
not available) is by redirecting both input and output. Here is an
example of running the fdisk program on one machine, but controlling it
through the serial port from another machine. You need to have the null
modem cable attached and run the terminal program as mentioned above.
Here is how to redirect input and output:
fdisk /dev/hda </dev/ttyS0 1>/dev/ttyS0 2>/dev/ttyS0
Headless server settings
/etc/inittab
7:2345:respawn:/sbin/agetty 115200 ttyS0 vt100
|
/etc/securetty
/etc/lilo.conf
append="console=ttyS0,115200 console=tty1"
|
/etc/sysconfig/kudzu
TERMINOLOGY
STEP1
STEP2
STEP3
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REFERENCE
References:
/usr/src/linux/Documentation/serial-console.txt
/usr/src/linux/Documentation/kernel-parameters.txt |
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