Console Configuration: Difference between revisions
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This article explains how to configure various operating |
This article explains how to configure various operating systems to use a serial console. |
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== GRUB == |
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To use the serial console exclusively for GRUB, add the following lines to menu.lst: |
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serial --unit=0 --speed=115200 |
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terminal serial |
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To allow use of either the serial console or monitor/keyboard, add these lines instead: |
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serial --unit=0 --speed=115200 |
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terminal --timeout=10 console serial |
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== Linux == |
== Linux == |
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=== Kernel Messages === |
=== Kernel Messages === |
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To make /dev/console the serial port, append |
To make /dev/console the serial port, append |
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console=ttyS1,9600 |
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You can have kernel messages displayed on both the serial port and the monitor by specifying two consoles, as in "console=ttyS0,115200 console=tty0". |
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to the kernel command line. You can replace 115200 by any valid baud rate. This will make calls to printk() display to the serial port. You can have kernel messages displayed on both the serial port and the monitor by specifying two consoles, as in |
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console=ttyS0,115200 console=tty0 |
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=== Console Login === |
=== Console Login === |
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T0:2:respawn:/sbin/getty -L ttyS0 115200 vt100 |
T0:2:respawn:/sbin/getty -L ttyS0 115200 vt100 |
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Note: we use [[Puppet]] to manage inittab. You must make this change in nodes.pp rather than editing inittab directly. |
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== Solaris == |
== Solaris == |
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svcadm restart console-login |
svcadm restart console-login |
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[[Category:Software]] |
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Latest revision as of 19:20, 22 March 2010
This article explains how to configure various operating systems to use a serial console.
GRUB
To use the serial console exclusively for GRUB, add the following lines to menu.lst:
serial --unit=0 --speed=115200 terminal serial
To allow use of either the serial console or monitor/keyboard, add these lines instead:
serial --unit=0 --speed=115200 terminal --timeout=10 console serial
Linux
Kernel Messages
To make /dev/console the serial port, append
console=ttyS1,9600
to the kernel command line. You can replace 115200 by any valid baud rate. This will make calls to printk() display to the serial port. You can have kernel messages displayed on both the serial port and the monitor by specifying two consoles, as in
console=ttyS0,115200 console=tty0
Console Login
To get a login prompt on the serial port, you need to edit /etc/inittab. For example, if you have a vt100 connected to the first serial port at 128k baud, use a line such as the following:
T0:2:respawn:/sbin/getty -L ttyS0 115200 vt100
Solaris
To make /dev/console the serial port, use eeprom:
eeprom console=ttya ttya-mode="115200,8,n,1,-"
You must update the boot archive after doing this:
bootadm update-archive
Unfortunately, there does not seem to use both the serial port and monitor as the console in Solaris. Adding a GRUB entry to boot using the keyboard and monitor as the console is highly recommended:
title Solaris 10 AMD64 TEXT CONSOLE kernel /platform/i86pc/multiboot kernel/amd64/unix -B console=text module /platform/i86pc/boot_archive title Solaris 10 AMD64 SERIAL CONSOLE kernel /platform/i86pc/multiboot kernel/amd64/unix -B console=ttya,ttya-mode="115200,8,n,1,-" module /platform/i86pc/boot_archive
Next, modify /etc/ttydefs so that console-login doesn't change the baud after boot:
console:115200 hupcl opost onlcr:115200::console
Finally, restart console-login:
svcadm restart console-login