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UP vs SMP kernel ?
by Robert 28 Oct '05

28 Oct '05

There was a discussion here several days ago that was precipitated by my decision to manually install the new kernel before YUMming the upgrade to CentOS 4.2. The upgrade went south but I recovered by doing a fresh install and a bunch of copying from backups. All's well EXCEPT that I'm back in the same "box", thanks to anaconda. I set out to upgrade kernels this morning: [root@mavis download]# yum update kernel\* Setting up Update Process Setting up repositories dag 100% |=========================| 1.1 kB 00:00 update 100% |=========================| 951 B 00:00 base 100% |=========================| 1.1 kB 00:00 addons 100% |=========================| 951 B 00:00 extras 100% |=========================| 1.1 kB 00:00 Reading repository metadata in from local files Resolving Dependencies --> Populating transaction set with selected packages. Please wait. ---> Downloading header for kernel-hugemem-devel to pack into transaction set. kernel-hugemem-devel-2.6. 100% |=========================| 656 kB 00:04 ---> Package kernel-hugemem-devel.i686 0:2.6.9-22.0.1.EL set to be updated ---> Downloading header for kernel-smp-devel to pack into transaction set. kernel-smp-devel-2.6.9-22 100% |=========================| 648 kB 00:04 ---> Package kernel-smp-devel.i686 0:2.6.9-22.0.1.EL set to be updated ---> Downloading header for kernel-devel to pack into transaction set. kernel-devel-2.6.9-22.0.1 100% |=========================| 642 kB 00:04 ---> Package kernel-devel.i686 0:2.6.9-22.0.1.EL set to be installed ---> Downloading header for kernel to pack into transaction set. kernel-2.6.9-22.0.1.EL.i6 100% |=========================| 151 kB 00:00 ---> Package kernel.i686 0:2.6.9-22.0.1.EL set to be installed ---> Downloading header for kernel-smp to pack into transaction set. kernel-smp-2.6.9-22.0.1.E 100% |=========================| 151 kB 00:00 ---> Package kernel-smp.i686 0:2.6.9-22.0.1.EL set to be installed ---> Downloading header for kernel-doc to pack into transaction set. kernel-doc-2.6.9-22.0.1.E 100% |=========================| 123 kB 00:00 ---> Package kernel-doc.noarch 0:2.6.9-22.0.1.EL set to be updated --> Running transaction check Dependencies Resolved ============================================================================= Package Arch Version Repository Size ============================================================================= Installing: kernel i686 2.6.9-22.0.1.EL update 9.7 M kernel-devel i686 2.6.9-22.0.1.EL update 3.6 M kernel-smp i686 2.6.9-22.0.1.EL update 9.4 M Updating: kernel-doc noarch 2.6.9-22.0.1.EL update 2.0 M kernel-hugemem-devel i686 2.6.9-22.0.1.EL update 3.6 M kernel-smp-devel i686 2.6.9-22.0.1.EL update 3.6 M Transaction Summary ============================================================================= Install 3 Package(s) Update 3 Package(s) Remove 0 Package(s) Total download size: 32 M Is this ok [y/N]: n Exiting on user Command Complete! You have new mail in /var/spool/mail/root [root@mavis download]# rpm -qa | grep kernel kernel-smp-devel-2.6.9-22.EL kernel-2.6.9-22.EL kernel-hugemem-devel-2.6.9-22.EL kernel-utils-2.4-13.1.69 kernel-devel-2.6.9-22.EL kernel-doc-2.6.9-22.EL kernel-smp-2.6.9-22.EL [root@mavis download]# ...and was reminded that anaconda installed both kernels from the CentOS 4.2 DVD. I verified that I had, indeed repaired /boot/grub/grub.conf following the install: [root@mavis download]# cat /etc/grub.conf # grub.conf generated by anaconda # # Note that you do not have to rerun grub after making changes to this file # NOTICE: You have a /boot partition. This means that # all kernel and initrd paths are relative to /boot/, eg. # root (hd0,0) # kernel /vmlinuz-version ro root=/dev/VolGroup00/LogVol00 # initrd /initrd-version.img #boot=/dev/hdb default=0 timeout=5 splashimage=(hd0,0)/grub/splash.xpm.gz #hiddenmenu title CentOS-4 i386-up (2.6.9-22.EL) root (hd0,0) kernel /vmlinuz-2.6.9-22.EL ro root=/dev/VolGroup00/LogVol00 initrd /initrd-2.6.9-22.EL.img You have new mail in /var/spool/mail/root Then, I proceeded with the kernel upgrade and checked grub.conf again [root@mavis download]# cat /etc/grub.conf # grub.conf generated by anaconda # # Note that you do not have to rerun grub after making changes to this file # NOTICE: You have a /boot partition. This means that # all kernel and initrd paths are relative to /boot/, eg. # root (hd0,0) # kernel /vmlinuz-version ro root=/dev/VolGroup00/LogVol00 # initrd /initrd-version.img #boot=/dev/hdb default=0 timeout=5 splashimage=(hd0,0)/grub/splash.xpm.gz #hiddenmenu title CentOS (2.6.9-22.0.1.ELsmp) root (hd0,0) kernel /vmlinuz-2.6.9-22.0.1.ELsmp ro root=/dev/VolGroup00/LogVol00 initrd /initrd-2.6.9-22.0.1.ELsmp.img title CentOS (2.6.9-22.0.1.EL) root (hd0,0) kernel /vmlinuz-2.6.9-22.0.1.EL ro root=/dev/VolGroup00/LogVol00 initrd /initrd-2.6.9-22.0.1.EL.img title CentOS-4 i386-up (2.6.9-22.EL) root (hd0,0) kernel /vmlinuz-2.6.9-22.EL ro root=/dev/VolGroup00/LogVol00 initrd /initrd-2.6.9-22.EL.img You have new mail in /var/spool/mail/root [root@mavis download]# To find that the ^%#$@ smp kernel is once more the default! And THAT is why this automagic stuff sometimes scares hell outta me.

3 2

VLAN tagging problems
by Robin Mordasiewicz 28 Oct '05

28 Oct '05

We are using Centos behind an F5 Bigip load balancer. The linux box is using bonding and tagged VLAN's Everything works fine except that when traffic is forwarded from the BigIP to the linux box on the VLAN where the web server is running the linux box returns the traffic on the wrong VLAN, It returns traffic on the lowest ordered VLAN. ie. here is a tcpdump on my load balancer showing traffic being sent on VLAN 911 to the linux box, but the linux box returns traffic on VLAN 902. The linux box is returning traffic on the same VLAN as its configured default gateway. If I change the default gateway to be on the VLAN 911 then everytyhing works. Any ideas ? 07:38:15.480141 802.1Q vlan#911 P0 10.90.11.244.http > 10.90.11.1.47970: . ack 9 win 1098 (DF) 07:38:15.691074 802.1Q vlan#911 P0 10.10.0.27.34023 > 10.90.11.244.http: S 2715145345:2715145345(0) win 4380 <mss 1460,nop,wscale 0,nop,nop,timestamp 72820060 0,sackOK,eol> (DF) 07:38:15.691074 802.1Q vlan#902 P0 10.90.11.244.http > 10.10.0.27.34023: S 514059651:514059651(0) ack 2715145346 win 5808 <mss 1464,sackOK,timestamp 51754641 72820060,nop,wscale 2> (DF) 07:38:18.630101 802.1Q vlan#902 P0 10.90.11.244.http > 10.10.0.27.34023: S 514059651:514059651(0) ack 2715145346 win 5808 <mss 1464,sackOK,timestamp 51757641 72820060,nop,wscale 2> (DF) 07:38:18.630101 802.1Q vlan#911 P0 10.10.0.27.34023 > 10.90.11.244.http: S 2715145345:2715145345(0) win 4380 <mss 1460,nop,wscale 0,nop,nop,timestamp 72823060 0,sackOK,eol> (DF) 07:38:18.630101 802.1Q vlan#902 P0 10.90.11.244.http > 10.10.0.27.34023: S 514059651:514059651(0) ack 2715145346 win 5808 <mss 1464,sackOK,timestamp 51757642 72820060,nop,wscale 2> (DF) 07:38:20.520099 802.1Q vlan#911 P0 10.90.11.1.48003 > 10.90.11.244.http: S 1650014488:1650014488(0) win 5840 <mss 1460,nop,nop,sackOK,nop,wscale 0> (DF)

4 9

CentOS with VMware issues
by Dustin Krysak 28 Oct '05

28 Oct '05

Good day everyone..... I have an install of centos 4.0 patched to 4.2 as my base install. I then installed VMWare 3.2 (gx) over top. I was then going through the install of centos 4.2 (non-patched - latest ISO's) into a virtual machine. Now here is where the issue happens.... on the install, the file "xorg-x11" causes a typical "file can not be access/ file not found" error. I have tried 2 sets of disks (different media even) on my older ISO images, and then even started with the current ISO images on another set of new media. The same symptom always occurs. On the same file, every-time. HAs anyone come across this? Does anyone have CentOS working with VMWare? Thanks in advance! Dustin

2 2

prepare for centos on compaq dl380 G1
by Robert 28 Oct '05

28 Oct '05

greetings i have a few dual P3 Compaq 1850R units and use compaq smartstart 5.5 on them before a CentOS 4 load i have acquired some dual P3 Compaq DL380 G1 i.e. Generation 1 units and am wondering which specific smartstart download i should be using for them from this URL below h18004.www1.hp.com/support/files/server/us/subscription/ssdownloads.asp would someone please share their experience on this so i dont have to waste time and bandwidth? thank you and kind regards - rh -- Robert Hanson - Abba Communications Computer & Internet Services (509) 624-7159 - www.abbacomm.net

3 3

kernel panic when booting with new lvm group/volume
by Aleksandar Milivojevic 28 Oct '05

28 Oct '05

I've added new volume group with single logical volume: pvcreate /dev/sdb1 vgcreate -s 32m xxx_vg /dev/sdb1 lvcreate -l 1234 -n yyy_lv xxx_vg and rebooted the server after it. When booting, the kernel panics with can't mount root file system. Looking at the console output, it seems all volume groups and all logical volumes on them were imported correctly. However, if I go to rescue mode, and re-create initrd image: chroot /mnt/sysimage cd /boot rm initrd-ver.img mkinitrd initrd-ver.img ver lilo then reboot, the server comes up just fine. This is kind of wierd. The root file system was available (at least according to vgscan output which claimed it imported my sys_vg volume group with all the logical volumes I have on it), I haven't touched sys_vg at all, however unless I actually rebuild initrd image, the kernel fails to mount it!? ---------------------------------------------------------------- This message was sent using IMP, the Internet Messaging Program.

1 0

bind for dummies
by Craig White 28 Oct '05

28 Oct '05

Scenario... 2 Linux servers both running bind. CentOS 3.5 DNS Master is also samba PDC and LDAP master DNS slave is also samba BDC and LDAP slave DHCP configuration instructs clients of the 2 DNS servers. Windows seems to always want to register DNS with slave which they aren't permitted to do, and seemingly never with master (where they are permitted) which generates errors such as... Oct 28 12:38:05 linserv1 named[2990]: client 192.168.xx.192#1065: update forwarding denied am I supposed to configure master differently to permit forwarding from slave? Craig -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.

1 0

CentOS 4.2 iSCSI initiator
by Morten 28 Oct '05

28 Oct '05

Hi. Anyone using CentOS 4.2 iscsi-initiator-utils-4.0.3.0-2 in a production setup? I'm planning to do so shortly, and would like to hear about any experiences (good/bad) or recommendations. The target is going to be a Dell AX100i. Br, Morten

2 1

off-topic: anybody with spare $12k
by Aleksandar Milivojevic 28 Oct '05

28 Oct '05

Might be old new... Check www.redhat.org ;-) ---------------------------------------------------------------- This message was sent using IMP, the Internet Messaging Program.

2 1

Upgrading from WBEL and 4.2?
by Benjamin Smith 28 Oct '05

28 Oct '05

A while ago, I wrote a script to switch a server from WBEL 4.x to CentOS 4.x. The recent switch to 4.2 broke this script. Now there are all kinds of dependencies like python-urlgrabber, and tshe task of getting these sorted out just drop me into dependency hell. (and this is just trying to get yum installed!) Suggestions? -Ben -- "The best way to predict the future is to invent it." - XEROX PARC slogan, circa 1978

2 4

calendars
by Tom Brown 28 Oct '05

28 Oct '05

Hi what do you guys use for shared calendars these days? I've been using corporate time but that is now part of Oracle suite so looking for an alternative that is hopefully open source/free to complete my 'get away from exchange' package. thanks

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