Very good info...although at my company we manage our AIX and Linux servers
with advocent/kvm when ssh is not an option. At home, this may come in
handy! Thanks!
> -----Original Message-----
> From: centos-bounces@xxxxxxxxxx
> [mailto:centos-bounces@xxxxxxxxxx] On Behalf Of
> pctech@xxxxxxxxxxxxxxxxx
> Sent: Friday, June 30, 2006 1:11 PM
> To: centos@xxxxxxxxxx
> Subject: RE: Re: [CentOS] /etc/inittab: Serial access/ Console Server
>
> >On Thu, 2006-06-29 at 20:48 -0700, Chris Fox wrote:
> >> -----BEGIN PGP SIGNED MESSAGE-----
> >> Hash: SHA1
> >>
> >> Rodrigo Barbosa wrote:
> >>
> >> > you might want to try agetty:
> >> >
> >> > T0:23:respawn:/sbin/agetty 9600 ttyS0 vt100
> >> >
> >> > Not sure if it will work, but seems likely.
> >> >
> >> I've always wanted to know how this is done (before serial
> ports go
> >> away forever).
> >>
> >
> >We (CentOS Project) just got a $29,000 machine w/o a video
> card. (Sparc
> >niagara t2000 machine).
> >
> >I use a serial connection to what it boot ...
> >
> >
>
> You don't just need the inittab setting. You also need a
> GRUB setting and a secureTTY detting. The following is a
> paste out of my firewall document that I wrote that has been
> tested and works:
>
> 6.15 Configuring Headless Operation
> By configuring "headless" operating we will be able to manage
> the firewall via a cable plugged into the serial port of the
> firewall. This obviates the need to plug a keyboard and
> monitor into it to perform changes. Thus the term "headless".
>
> 6.15.1 Changes to /etc/inittab
> The /etc/inittab file contains settings that get applied to
> the Operating Systems at boot time. There are some changes
> that need to be made to these settings. In order to edit the
> /etc/inittab file type:
>
> vi /etc/inittab
>
> Typing this command will open the /etc/inittab file for editing.
>
> As stated earlier the 18th line down is the run level line.
> Add the following line to the file:
>
> S0:12345:respawn:/sbin/agetty ttyS0 9600 linux
>
> This line sets the Operating System to be able to send boot
> time information to the serial port in addition to the console.
>
> After you have made these changes to the /etc/inittab file
> press the colon (: ) key and then type wq to quit vi and save
> the changes.
>
> 6.15.2 Changes to /etc/securetty
> The /etc/securetty sets the controls for which TTY devices
> that the root account can log on via. In order for us to be
> able to log onto the serial console as root or to be able to
> su to root we must add a line to the file. In order to edit
> the /etc/secuertty file type:
>
> vi /etc/securetty
>
> Typing this command will open the /etc/secuertty file for editing.
>
> Add the following line to the end of the file:
>
> ttyS0
>
> This line sets the Operating System to allow root to log on
> to the serial port in addition to the console.
>
> After you have made these changes to the /etc/securetty file
> press the colon (: ) key and then type wq to quit vi and save
> the changes.
>
> 6.15.3 Changes to the Boot Loader
> In order for boot-time messages to be sent to the console,
> including the boot loader information some changes must be
> made to the configuration file for it. The boot loader that
> CentOS uses is GRUB. As such, the configuration file is
> /etc/grub.conf.
>
> The first change that we must make is to add some lines after
> the timeout line in the GRUB configuration file. In order to
> edit the /etc/grub.conf file type:
>
> vi /etc/grub.conf
>
> Typing this command will open the /etc/grub.conf file for editing.
>
> Add the following two lines after the timeout line in the
> configuration file:
>
> serial --unit=0 --speed=9600
> terminal --timeout=2 serial console
>
> Another change that we must make in the GRUB configuration
> file is to tell the kernel to send out all kernel-level
> messages to the serial port in addition to the console. That
> is done by adding the following line to the end of the kernel line:
>
> console=tty1 console=ttyS0,9600
>
> After you have made these changes to the /etc/grub.conf file
> press the colon (: ) key and then type wq to quit vi and save
> the changes.
>
> Once you have made these changes reboot the firewall by
> typing by typing:
>
> reboot
>
> The firewall will now reboot.
>
>
>
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