OpenSSI Logo SourceForge Logo

 home page
 sourceforge page
 mailing lists
 feature list
 Bruce's corner
 related links
 1.2 stable
 1.9 development
 1.2 stable
 1.9 development
work items
 task list
 bug database
 feature requests
 process mgmt hooks
  hide sidebar
Configuring Serial Console with OpenSSI

You should already be familiar with configuring a serial console before 
reading this document. If you're not, the following HOWTO can be

The only extra thing to be aware of with an OpenSSI cluster is that a 
booting node gets its kernel arguments from one of three places, depending
on how it boots:

1) Nodes with local boot devices get their kernel arguments from their 
local copy of /etc/grub.conf. Whenever you update this file, you should run 
ssi-ksync to push your changes to all local boot devices.

2) Nodes that PXE boot get their kernel arguments from 
/tftpboot/pxelinux.cfg/default. This file is read everytime a node PXE boots.

A sample change would be:

 label openssi
 kernel kernel
-append initrd=initrd ro panic=15
+append initrd=initrd ro console=tty0 console=ttyS0,115200 panic=15

3) Nodes that Etherboot get their kernel arguments from the 
/tftpboot/combined image, which contains the kernel, kernel arguments and 
initrd for an etherbooting node. To modify the kernel arguments, edit the
--append option to the mkelf-linux command at the bottom of the 
/sbin/ssi-ksync-network script. After you change these arguments, be 
sure to run either ssi-ksync or ssi-ksync-network to generate a new 
/tftpboot/combined image. You will probably need to `touch' the kernel or
initrd before running the script, so that it will know it needs to rebuild 
the image.

A sample change would be:

 if [ $RUN_MKELF -eq 1 ]; then
-	mkelf-linux --append='panic=15' \
+	mkelf-linux --append='console=tty0 console=ttyS0,115200 panic=15' \
 		$kernel $initrd >/tftpboot/combined

4) As suggested in the HOWTO referenced above, you probably added a line to
your /etc/inittab to run a getty program on the serial console (otherwise
you could not login from the serial console). You should add a 'U' to the 
runlevel information for this line, so that this getty is started on all
nodes in the cluster, and not just the init node.

For example:

co:2345U:respawn:/sbin/agetty ttyS0 9600

This page last updated on Thu Dec 15 17:15:45 2005 GMT
privacy and legal statement