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Re: [CentOS] Emergency rescue help needed
by Rainer Duffner 04 Feb '09

04 Feb '09

Sorin Srbu schrieb: >> -----Original Message----- >> From: centos-bounces(a)centos.org [mailto:centos-bounces@centos.org] On Behalf Of >> Scott Silva >> Sent: Tuesday, February 03, 2009 10:45 PM >> To: centos(a)centos.org >> Subject: Re: [CentOS] Emergency rescue help needed >> >> I just had a Back-UPS of about 1998 vintage burst into flames about 6 months >> ago. Luckily, someone was near it and grabbed a fire extinguisher. It was a >> Saturday, and if this person hadn't been in on overtime, who knows what would >> have happened. >> > > Geez... I have a UPS for my admin-workstation just under the desk on the floor > in front of me. Suddenly I feel a bit anxious about that... There's a reason I don't like running anything beyond my ALIX-router 24x7 at home (while I'm away). And it's not the power-bill. IMO, UPSs don't really belong in the living-room. Doesn't really matter if they are old or new. Imagine returning home from work, only to find only the smoldering remainders of what was your house in the morning... Rainer

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kickstart won't kick-off via network
by Isaac Hailperin 04 Feb '09

04 Feb '09

Hello list, I try to do an automated network installation of centos 5.2, following the redat documentation at http://www.redhat.com/docs/manuals/enterprise/RHEL-4-Manual/sysadmin-guide/… However, when installing I get promptet for various things, like which network interface I would like to use for installation, or the location of the install medium. But thats not what I wanted, I want to start the boot process, and then leave the box untill it is installed. What I did: First a manual install form DVD. I then used the kickstart file /root/anaconda-ks.cfg for a network installation. I changed the install line from cdrom to url: install url --url http://9.0.0.1/all/repository/CentOS5.2 This url contains the whole DVD (and can be viewed in a webbrowser). Then I generated the following entry in my pxe control file (default): LABEL centos5.2_cluto_cnode MENU LABEL CentOS 5.2 cluto ^node kernel distro/centos5.2/vmlinuz append initrd=distro/centos5.2/initrd.img ramdisk_size=7494 ks=http://9.0.0.1/all/profiles/cluto_centos5.2/cnode/ks.cfg This is part of a boot menue, therefor the MENU entry. The url of the kickstart file is also valid, I can wget it. Now since I get asked all these questions at boot time, I suspect that the kickstart file is not there to answer these questions. I would be greatful for any suggestions on how to further debug or solve this. Isaac _____________________________________________________________________ Vorstand: Ertu Uysal, Axel Queck Vorsitzender des Aufsichtsrats: Bernhard Bruscha Sitz der Gesellschaft: Tuebingen Amtsgericht Stuttgart HRB 381299 Diese E-Mail enthaelt vertrauliche und/oder rechtlich geschuetzte Informationen. Wenn Sie nicht der richtige Adressat sind oder diese E-Mail irrtuemlich erhalten haben, informieren Sie bitte sofort den Absender und vernichten Sie diese Mail. Das unerlaubte Kopieren sowie die unbefugte Weitergabe dieser Mail ist nicht gestattet. This e-mail may contain confidential and/or privileged information. If you are not the intended recipient (or have received this e-mail in error) please notify the sender immediately and destroy this e-mail. Any unauthorized copying, disclosure or distribution of the material in this e-mail is strictly forbidden.

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Re: [CentOS] kickstart won't kick-off via network
by Isaac Hailperin 04 Feb '09

04 Feb '09

> Especially since FDD aren't that common anymore... I'll see if I can't adapt > my SOP:s to boot and install from network. The set up is actually not too complicated. I really recommend it, you just plug in the computer and let it install. There are various variants, you can either define what will be installed by naming the pxe controll file according to the mac address, or you can make a default boot menue. Boot menues are described here: http://syslinux.zytor.com/wiki/index.php/PXELINUX#Custom_Menu_Example_with_… good luck, Isaac _____________________________________________________________________ Vorstand: Ertu Uysal, Axel Queck Vorsitzender des Aufsichtsrats: Bernhard Bruscha Sitz der Gesellschaft: Tuebingen Amtsgericht Stuttgart HRB 381299 Diese E-Mail enthaelt vertrauliche und/oder rechtlich geschuetzte Informationen. Wenn Sie nicht der richtige Adressat sind oder diese E-Mail irrtuemlich erhalten haben, informieren Sie bitte sofort den Absender und vernichten Sie diese Mail. Das unerlaubte Kopieren sowie die unbefugte Weitergabe dieser Mail ist nicht gestattet. This e-mail may contain confidential and/or privileged information. If you are not the intended recipient (or have received this e-mail in error) please notify the sender immediately and destroy this e-mail. Any unauthorized copying, disclosure or distribution of the material in this e-mail is strictly forbidden.

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Re: [CentOS] Emergency rescue help needed
by Les Mikesell 04 Feb '09

04 Feb '09

Sorin Srbu wrote: > > The voltage has been fairly constant here over the years since I started using > UPS and logging the voltage and stuff, 238V more or less constantly. It rarely > drops below 236V or over 240V. We mainly use the UPS:es to have controlled > shutdowns should the power fail entirely - We had some issues a few years back > while they built a new school the other side of the road when the power went > up and down for a uyear or so, and the diesel-generators didn't start up as > expected. This whole building where I work is supposed to be a wartime > hospital with power-backups up to yinyang. But it failed when we needed > them... #=;-( It's a tough thing to get right. I've been involved with several systems and they all failed a time or two in initial testing even after everyone thought they should work. And then things break after that... > > It might be that the power is too high, although the standard is 240V in > Europe AFAIK. Or the UPS-units *may* have been rated for the previous lower > voltage-level at 220V, but that sounds a bit farfetched IMO. Unless the units > were a (very much) older batch that APC dumped on us... Another issue can be that you aren't backing up the air conditioner power, so when the grid goes down your still-running equipment overheats, damaging the electronics. This is particularly likely if your servers are racked densely in a small space. -- Les Mikesell lesmikesell(a)gmail.com

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Re: [CentOS] kickstart won't kick-off via network
by Isaac Hailperin 04 Feb '09

04 Feb '09

> >Now since I get asked all these questions at boot time, I suspect that > >the kickstart file is not there to answer these questions. > > It does use it, it just doesn't find the network-block in ks.cfg. Does your > ks.cfg contain some lines for the networking? Yes: # Kickstart file automatically generated by anaconda. install url --url http://9.0.0.1/all/repository/CentOS5.2 [...] network --device eth0 --bootproto dhcp --hostname node1.cluster network --device eth1 --bootproto dhcp --hostname node1.cluster [...] > You didn't modify the ks.cfg you > mention above, did you? Yes, I modified the part after install. It used to be "cdrom". > You can open the ks.cfg you already have and then tweak with the wizard. I opened the ks.cfg with system-config-kickstart. I configured it to install from network. It produced the following: #platform=x86, AMD64, or Intel EM64T # System authorization information auth --useshadow --enablemd5 # System bootloader configuration bootloader --append="rhgb quiet" --location=mbr --driveorder=sda # Partition clearing information clearpart --linux --drives=sda # Use graphical install graphical # Firewall configuration firewall --disabled # Run the Setup Agent on first boot firstboot --disable # System keyboard keyboard us # System language lang en_US # Installation logging level logging --level=info # Use network installation url --url=http://9.0.0.1/all/repository/CentOS5.2 # Network information network --bootproto=dhcp --device=eth0 --onboot=on network --bootproto=dhcp --device=eth1 --onboot=on #Root password rootpw --iscrypted $xxx # SELinux configuration selinux --disabled # System timezone timezone --isUtc America/New_York # Install OS instead of upgrade install # X Window System configuration information xconfig --defaultdesktop=GNOME --depth=8 --resolution=640x480 --startxonboot # Disk partitioning information part / --bytes-per-inode=4096 --fstype="ext3" --size=25000 part swap --bytes-per-inode=4096 --size=8000 part /home --bytes-per-inode=4096 --fstype="ext3" --grow --size=100 %packages @base-x Now in conjunction with the kernel parameter ksdevice=eth1 (thank you Kai!) this works like a charm. I seems that I misunderstood the use of "install" and "url". - Comming form SLES and autoyast I thought I should avoid the gui, but kickstart seems to do better here - Thank you! Isaac _____________________________________________________________________ Vorstand: Ertu Uysal, Axel Queck Vorsitzender des Aufsichtsrats: Bernhard Bruscha Sitz der Gesellschaft: Tuebingen Amtsgericht Stuttgart HRB 381299 Diese E-Mail enthaelt vertrauliche und/oder rechtlich geschuetzte Informationen. Wenn Sie nicht der richtige Adressat sind oder diese E-Mail irrtuemlich erhalten haben, informieren Sie bitte sofort den Absender und vernichten Sie diese Mail. Das unerlaubte Kopieren sowie die unbefugte Weitergabe dieser Mail ist nicht gestattet. This e-mail may contain confidential and/or privileged information. If you are not the intended recipient (or have received this e-mail in error) please notify the sender immediately and destroy this e-mail. Any unauthorized copying, disclosure or distribution of the material in this e-mail is strictly forbidden.

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RHEL -> CentOS
by John R Pierce 04 Feb '09

04 Feb '09

I have a system that was originally installed with RHEL 3 x86_64, and I've since 'updated' it to CentOS 3 via installing yum and centos-release, then running a yum update. is there any way I can force -all- installed packages to be replaced with their centos analogs just to be sure its all consistent?

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/etc/X11/xorg.conf question
by Lanny Marcus 03 Feb '09

03 Feb '09

If I use "system-config-display" or "system-config-display --reconfig" although I get a message that I need to log out of GNOME, to have the new file written, for new Display Resolution, logging out or restarting the box does not result in the new settings for the Display taking hold. Sometimes, the number of colors is updated, but *never* the Resolution. Below is my xorg.conf file. What do I need to include in xorg.conf for the resolution to be 1280 x 1024 instead of the current 1600 x 1200? Display is a Dell M991 and the Video Card is shown as Nvidia NV11 (GeForce2 MX/MX400). CentOS 5.2 (32 bit) fully updated. TIA! # Xorg configuration created by system-config-display Section "ServerLayout" Identifier "single head configuration" Screen 0 "Screen0" 0 0 InputDevice "Keyboard0" "CoreKeyboard" EndSection Section "InputDevice" Identifier "Keyboard0" Driver "kbd" Option "XkbModel" "pc105" Option "XkbLayout" "us" EndSection Section "Device" Identifier "Videocard0" Driver "nv" EndSection Section "Screen" Identifier "Screen0" Device "Videocard0" DefaultDepth 16 SubSection "Display" Viewport 0 0 Depth 24 EndSubSection SubSection "Display" Viewport 0 0 Depth 16 Modes "1600x1200" "1600x1024" "1440x900" "1400x1050" "1280x1024" "1280x1024" "1280x960" "1280x960" "1280x800" "1280x800" "1152x864" "1152x864" "1152x768" "1152x768" "1024x768" "1024x768" "800x600" "800x600" "640x480" "640x480" EndSubSection EndSection

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Re: [CentOS] Internet problem
by fabian dacunha 03 Feb '09

03 Feb '09

Dear All, I have a Centos 5.2 server used as a squid proxy server for quite sometime and was workin fine after a power failure the system refused to boot i jus see the grub boot load screen n then hangs so using the space bar n with the arrow keys i selected my earlier kernel and it booted fine i think that the latest kernel file i have that isvmlinuz-2.6.18-92.1.17.el5xen is corrupted. how could i restore it back will yum upgrade solve the problem appreciate ur help regards fabian -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.

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Port Forwarding
by Thom Paine 03 Feb '09

03 Feb '09

I'm having trouble getting port forwarding working on my one box. I have 2 incoming internet connections. I have 2 servers on these connections. pubinternet privinternet eth0:x.x.x.x eth0:y.y.y.y eth1:10.10.10.1 eth1:10.10.10.4 I need to be able to port forward traffic from y.y.y.y to the box on 10.10.10.1. I have my firewall configured (I use gshield) but 10.10.10.1 does not seem to answer when I try and test. I use gshield all the time for other servers with only 1 connection, and it works awesome. I can't seem to get it to forward traffic from y.y.y.y to 10.10.10.1. 10.10.10.1 and 10.10.10.4 are connected together with a switch, and I am able to telnet to 10.10.10.1 from 10.10.10.4 on port 25. Is there some step with networking that I am missing in getting this to work? Thanks. -- -=/>Thom

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Intel DG33BU motherboard
by Paolo Supino 03 Feb '09

03 Feb '09

Hi I've installed CentOS 5.2 (i386) in a computer with a DG33BU motherboard ... When I installed it it crashed because of ACPI issues. Searching Google I found that I need to turn ACPI off in order to successfully install CentOS, which I did. After a while I noticed that because of ACPI is off the Linux kernel finds, initializes and uses only 1 CPU core in the Q6600 quad core CPU that is installed in this computer :-( How can I force it to find, initialize and use all the 4 cores in the computer even if ACPI is off? -- TIA Paolo

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