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new centos 4.4 kernel
by Jerry Geis 18 Aug '06

18 Aug '06

I have heard rumblings about the new kernel for 4.4 A change was made to the kernel for disk I/O to make it better/faster. I havnt heard/seen anything about what that really translates to. Any thoughts/opinions on this. jerry

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RE: Re: [CentOS] connecting linux console using serial port
by pctech＠mybellybutton.com 18 Aug '06

18 Aug '06

>Quoting israel.garcia(a)cimex.com.cu: > >> Hi, I have a serial modem connected to /dev/ttyS0 on my CentOS server, I >> want to set up this server to allow connections through this serial >> modem but only to the console.... (I want to log in)... >> >> PS: I don't want PPP, I just want to get my linux console through this >> serial modem... >> >> What do I have to configure on my linux? > >Hmmm... Do you want *console* (as in /dev/console) or just terminal >access (as in /dev/ttySO)? > The easy way is to configure the modem so that it is in Auto-Answer mode all of the time. Once it is in auto-answer mode it will answer when you dial it and then you will see what the is transmitted to it via the serial cable. Then follow the instructions for setting up Linux to use the serial port for output/input. If you don't have that information at your fingertips it is as follows: 2.3 Configuring Headless Operation By configuring “headless” operating we will be able to manage the system via a cable plugged into the serial port of the system. This obviates the need to plug a keyboard and monitor into it to perform changes. Thus the term “headless”. 2.3.1 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 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. 2.3.2 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. 2.3.3 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=5 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 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 system by typing by typing: reboot The system will now reboot. >-- >NOTICE: If you are not intended recipient, you are hereby notified >that by reading this message you agreed not to disturb frogs during >mating season. For more info, visit http://www.8-P.ca/ > >_______________________________________________ >CentOS mailing list >CentOS(a)centos.org >http://lists.centos.org/mailman/listinfo/centos

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connecting linux console using serial port
by israel.garcia＠cimex.com.cu 18 Aug '06

18 Aug '06

Hi, I have a serial modem connected to /dev/ttyS0 on my CentOS server, I want to set up this server to allow connections through this serial modem but only to the console.... (I want to log in)... PS: I don't want PPP, I just want to get my linux console through this serial modem... What do I have to configure on my linux? Thanks for your time Regards; Israel

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change default columns in init 3?
by Yiorgos Stamoulis 18 Aug '06

18 Aug '06

Hello list, How can I change the init 3 shell default $COLUMNS ? (I am trying to wean myself from GUI) Thanks

3 6

Netdump
by bruce 18 Aug '06

18 Aug '06

hi... has anyone ever used netdump?

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Tomcat Virtualhost Question
by John Hinton 18 Aug '06

18 Aug '06

I have tomcat up and running (manager operational) and am serving genuine Apache Tomcat Error Reports from a virtualhost. :) So, it looks like I'm good up to the point of creating a WEB-INF directory inside of the virtual docroot. Can someone tell me how this should be done? Permissions.. contents.. or if I'm just supposed to pull this from somewhere in the Tomcat installation? I have googled my butt off and not found a thing about how this directory should be created. Thanks, John Hinton

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Upgrading GFS/RHCS for CentOS
by carlopmart 18 Aug '06

18 Aug '06

Hi all, Somebody knows when RHCS and GFS kernel dependant packages will be upgraded to use it with kernel version 2.6.9-34.0.2?? I nee to update my kernels due to security policy on my company and recent vulnerabilities discovered .... many thanks. -- CL Martinez carlopmart {at} gmail {d0t} com

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CentOSPlus kernel - Request for input
by Jerry Geis 17 Aug '06

17 Aug '06

Johnny, If you could change the following config in the new kernel: Device Drivers -> Character Devices -> Serial Drivers change Max number of 8250 serial ports from 4 to 36 change Number of 8250 serial ports to register at runtime from 4 to 36 Thanks, jerry

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Re: [CentOS] Help: Marvell sk98lin driver missing from Centos 3 PXE initrd.img
by Ian Kaufman 17 Aug '06

17 Aug '06

Hi Mike, It may not be what you did, but rather the sk98lin drivers being horribly broken, especially with the newer Yukon 88E805X gigabit NICs. I just struggled with a backported version of the sky2 driver in the 2.6.9-34.0.2 kernel and the 88E8055 Yukon NIC (as found on the latest Fujitsu T4210 tablet convertible). Unfortunately, the backported drivers I was sent only go back as far as 2.6.7 for compatibility. John Linville at Red Hat has some 2.4.21-44 test kernels that have slightly newer sky2 drivers: http://people.redhat.com/linville/kernels/rhel3/ I used his RHEL4 test kernels and it worked well, but alas other issues kept me from using it, and I had to backport the driver myself. Ian

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netdump rpms..
by bruce 17 Aug '06

17 Aug '06

hi... can someone tell me if the netdump rpms for centos are the same as the rhel4 rpms. also, are the rpms on the various rpm sites (atrpms/rpmfind.net/etc...) the same as the rhel4 rpms... thanks

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