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Moving LVM from one machine to another
by Stephen Harris 09 Jan '10

09 Jan '10

My CentOS4 machine died (CPU cooler failure, causing CPU to die). In this machine I had 5 Tbyte disks in a RAID5, and LVM structures on that. Now I've moved those 5 disks onto a CentOS5 machine and the RAID array is being rebuilt. However the LVM structures weren't detected at boot time. I was able to "vgscan" and 'vgchange -a y' to bring the volume online and then fsck the logical volumes. But I was concerned this didn't happen at boot time. Do I need to do anything else, or have the commands I've run done sufficient? FWIW, this machine has no other LVM (nor RAID) disks on it. (only 5 more hours for the rebuild to complete!) -- rgds Stephen

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Is it safe to run only the XEN kernel on dom0 host?
by Rudi Ahlers 09 Jan '10

09 Jan '10

Hi, I have an issue with my XEN servers, in that when I do a yum upgrade, it upgrades the kernels, and then updates the grub.conf file to boot with the normal Linux kernel, and not the XEN kernel - and I tend to forget to update the grub.conf, until I reboot and see XEN isn't running. So, is it safe to remove the normal kernel & kernel-development, and only run the XEN kernel? This is what I have currently: root@usaxen03:[~]$ rpm -qa | grep kernel kernel-xen-2.6.18-128.7.1.el5 kernel-xen-2.6.18-164.10.1.el5 kernel-xen-2.6.18-164.el5 kernel-headers-2.6.18-164.10.1.el5 kernel-xen-2.6.18-164.6.1.el5 kernel-xen-2.6.18-164.9.1.el5 When I want to remove kernel-headers, it wants to remove gcc as well: root@usaxen03:[~]$ rpm -qa | grep kernel kernel-xen-2.6.18-128.7.1.el5 kernel-xen-2.6.18-164.10.1.el5 kernel-xen-2.6.18-164.el5 kernel-headers-2.6.18-164.10.1.el5 kernel-xen-2.6.18-164.6.1.el5 kernel-xen-2.6.18-164.9.1.el5 Do I really need gcc on the XEN dom0 host? The servers are all running CentOS 5.4 x64

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chroot a few apps
by Vadkan Jozsef 09 Jan '10

09 Jan '10

Hi. What kind of chroot should I use, if I want to make a more secured desktop, running e.g.: pdf reader webbrowser audio player video player openoffice picture viewer mua ooo virtualbox e.g.: if theres a javascript vulnerability in google chrome [I haven't heard a NoScript extension for it :( ] a chroot would be good for stopping it from doing something bad with the whole system. or e.g.: I have to open a .doc file, that I don't trust, or a PDF can contain malicious code :( Any tips/docs/howtos? Thank you!

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Re: [CentOS] Apache/Cluster issue -- Single public IP address
by david＠pnyet.web.id 09 Jan '10

09 Jan '10

You can try heartbeart... :) DS ------Original Message------ From: avi(a)myphonebook.co.in Sender: centos-bounces(a)centos.org To: centos(a)centos.org ReplyTo: CentOS mailing list Subject: [CentOS] Apache/Cluster issue -- Single public IP address Sent: Jan 8, 2010 11:28 PM I want to set up a cluster that is used for web hosting (RHCS cluster). Recently, I experimented with a 2 node cluster and was able to run it successfully. However, I have started facing some issues with Apache, which I had configured as a service using the Cluster configuration tool. To do this Apache needs a floating IP address. This address is in addition to the network interface IP address. For example if my NIC IP is 192.168.1.1, then I need 192.168.1.2 as a floating IP address, and this has to be bound to apache. At least this is what I understood after several hours of experimentation. I also figured that if I configured 192.168.1.1 as a cluster resource and bound it to apache, the cluster manager failed to start apache and the NIC was put "off". ( In effect 192.168.1.1 was removed from the NIC ). However, the Apache service ran fine when bound to the ADDITIONAL IP i.e. 192.168.1.2 ( the floating IP ). The above example was just a lab setup to test the cluster. My problem is that I only have a single public IP address, to serve my web server and my question is this: Is this the end of the road, for installing apache as a service with ONE public IP address?? I am willing to give further info, if required.

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How do I...
by fred smith 09 Jan '10

09 Jan '10

Only tangentially on topic, at best... Given a pile of html files, comprising chapters of a book, with a single html file that serves as a table of contents to the group, how would I turn the entire book into a single PDF? I can't think of a way to do that, all I can come up with would result in a pile of PDFs, one per html. But there's gotta be a better way. Suggestions welcome. Thanks in advance! (doing this on Linux, of course, which makes it slightly on topic.) Fred -- ---- Fred Smith -- fredex(a)fcshome.stoneham.ma.us ----------------------------- I can do all things through Christ who strengthens me. ------------------------------ Philippians 4:13 -------------------------------

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centos 5.4 :: linux-2.6.32.2 compile error (via nano L2200@1600)
by Adrian Sevcenco 09 Jan '10

09 Jan '10

Hi! I try to compile an vanilla kernel 2.6.32.2 on centos 5.4 and i have this error : CC mm/page-writeback.o /home/root_data/linux-2.6.32.2/mm/page-writeback.c: In function ‘test_clear_page_writeback’: /home/root_data/linux-2.6.32.2/mm/page-writeback.c:1280: internal compiler error: Segmentation fault Please submit a full bug report, with preprocessed source if appropriate. See <URL:http://bugzilla.redhat.com/bugzilla> for instructions. The bug is not reproducible, so it is likely a hardware or OS problem. make[2]: *** [mm/page-writeback.o] Error 1 make[1]: *** [mm] Error 2 make: *** [sub-make] Error 2 Have anyone any idea about this ? The hardware is in via vb8001 with this cpu [root@sevcenco linux-2.6.32.2]# cat /proc/cpuinfo processor : 0 vendor_id : CentaurHauls cpu family : 6 model : 15 model name : VIA Nano processor L2200@1600MHz stepping : 2 cpu MHz : 1615.851 cache size : 1024 KB fpu : yes fpu_exception : yes cpuid level : 10 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat clflush acpi mmx fxsr sse sse2 ss tm syscall nx fxsr_opt rdtscp lm up pni monitor vmx est tm2 ssse3 cx16 xtpr lahf_lm bogomips : 3231.70 clflush size : 64 cache_alignment : 64 address sizes : 40 bits physical, 48 bits virtual power management: The config can be found at http://sevcenco.homelinux.org/adrian/kernel_nano/ Thanks, Adrian

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selinux violation does not get logged
by Nataraj 09 Jan '10

09 Jan '10

After upgrading to centos 5.4 I am getting a selinux violation, yet nothing is logged to /var/log/audit/audit.log. Other violations do get logged. The violation occurs when running the following command on the mail server: aspen> /usr/bin/Mail centos(a)centos.org Subject: test hi Cc: aspen> send-mail: warning: premature end-of-input on /usr/sbin/postdrop -r while reading input attribute name send-mail: fatal: nataraj(500): unable to execute /usr/sbin/postdrop -r: Success If I run with "setenforce 0" /usr/bin/Mail works. With "setenforce 1" it gets the error above, yet the violation does not get logged, so I can't tell how to fix it. Note: /usr/bin/Mail is the postfix version of /usr/bin/Mail. Any ideas how I can find out what the violation is so I can add rules to allow it? Nataraj

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Re: [CentOS] New selinux-policy breaks logwatch emails?
by Les Bell 09 Jan '10

09 Jan '10

Kwan Lowe <kwan.lowe(a)gmail.com> wrote: >> Oh whew...From the other thread it looks like this bit a few people. << Sorry - I came in late and missed the earlier discussion (so many emails to skim, so little time . . . ). Around October, a Centos 5.3 web server here also stopped updating Webalizer stats. When I finally noticed, I discovered it was an issue with SELinux denying access to the logs, and used audit2allow to update the policy. If anyone else fell foul of this, I'm happy to send them the policy. Oh, wth - it's only two short files: *** webalizerlocal.te: module webalizerlocal 1.0; require { type httpd_t; type home_root_t; class file { read getattr }; } #============= httpd_t ============== allow httpd_t home_root_t:file { read getattr }; *** webalizerlocal2.te: module webalizerlocal2 1.0; require { type home_root_t; type webalizer_t; class dir search; } #============= webalizer_t ============== allow webalizer_t home_root_t:dir search; Best, --- Les Bell [http://www.lesbell.com.au] Tel: +61 2 9451 1144

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Serial port fun: CentOS 4.8 (32-bit) vs. CentOS 5.4 (64-bit)
by Robert Heller 08 Jan '10

08 Jan '10

I am in the process of migrating from running CentOS 4.8 (32-bit) to CentOS 5.4 (64-bit) on my AMD Sempron(tm) Processor LE-1300 system (it is running CentOS 4.8 32-bit because the disk images are from a previous PIII system), and things are 'interesting' WRT how the Lava Computer mfg Inc Quattro-PCI card is being handled. lspci (on CentOS 4.8 32-bit) yields: 01:0a.0 Serial controller: Lava Computer mfg Inc Quattro-PCI A 01:0a.1 Serial controller: Lava Computer mfg Inc Quattro-PCI B On the 32-bit system (2.6.9-89.0.18.EL.plus.c4 [i686]) dmesg says: Serial: 8250/16550 driver $Revision: 1.90 $ 8 ports, IRQ sharing enabled ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A ACPI: PCI Interrupt 0000:01:0a.0[A] -> GSI 16 (level, low) -> IRQ 233 ttyS4 at I/O 0xd080 (irq = 233) is a 16550A ttyS5 at I/O 0xd000 (irq = 233) is a 16550A ACPI: PCI Interrupt 0000:01:0a.1[A] -> GSI 16 (level, low) -> IRQ 233 ttyS6 at I/O 0xcc00 (irq = 233) is a 16550A ttyS7 at I/O 0xc880 (irq = 233) is a 16550A With the 64-bit kernel (2.6.18-164.el5 [x86_64]) I get: Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports, IRQ sharing enabled serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A serial8250: ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A 00:0a: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A ACPI: PCI Interrupt Link [LNKC] enabled at IRQ 19 ACPI: PCI Interrupt 0000:01:0a.0[A] -> Link [LNKC] -> GSI 19 (level, low) -> IRQ 177 0000:01:0a.0: ttyS2 at I/O 0xd080 (irq = 177) is a 16550A 0000:01:0a.0: ttyS3 at I/O 0xd000 (irq = 177) is a 16550A ACPI: PCI Interrupt 0000:01:0a.1[A] -> Link [LNKC] -> GSI 19 (level, low) -> IRQ 177 Couldn't register serial port 0000:01:0a.1: -28 OK, instead of skipping ttyS2 and ttyS3 (normally old-school on-board COM3 and COM4) and allocating ttyS4 through ttyS7 for the Quattro, it is assigning ttyS2 and ttyS3 to the first pair, and then barfing (-28?) on the second pair. I looked at the config files and found: The 4.8 kernel has: # # Serial drivers # CONFIG_SERIAL_8250=y CONFIG_SERIAL_8250_CONSOLE=y CONFIG_SERIAL_8250_PCI=y CONFIG_SERIAL_8250_PNP=y CONFIG_SERIAL_8250_CS=m CONFIG_SERIAL_8250_NR_UARTS=32 CONFIG_SERIAL_8250_RUNTIME_UARTS=4 CONFIG_SERIAL_8250_EXTENDED=y CONFIG_SERIAL_8250_MANY_PORTS=y CONFIG_SERIAL_8250_SHARE_IRQ=y CONFIG_SERIAL_8250_DETECT_IRQ=y CONFIG_SERIAL_8250_RSA=y and the 5.4 kernel has: # # Serial drivers # CONFIG_SERIAL_8250=y CONFIG_SERIAL_8250_CONSOLE=y CONFIG_SERIAL_8250_CS=m # CONFIG_SERIAL_8250_ACPI is not set CONFIG_SERIAL_8250_NR_UARTS=4 CONFIG_SERIAL_8250_EXTENDED=y # CONFIG_SERIAL_8250_MANY_PORTS is not set CONFIG_SERIAL_8250_SHARE_IRQ=y CONFIG_SERIAL_8250_DETECT_IRQ=y CONFIG_SERIAL_8250_MULTIPORT=y CONFIG_SERIAL_8250_RSA=y Is what I am seeing a result of CONFIG_SERIAL_8250_ACPI and/or CONFIG_SERIAL_8250_MANY_PORTS not being set? Would upgrading to the CentOSPlus kernel help? -- Robert Heller -- 978-544-6933 Deepwoods Software -- Download the Model Railroad System http://www.deepsoft.com/ -- Binaries for Linux and MS-Windows heller(a)deepsoft.com -- http://www.deepsoft.com/ModelRailroadSystem/

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Re: [CentOS] SAN help
by Per Qvindesland 08 Jan '10

08 Jan '10

Hi For sure no problems, I see this about everyday, the major reason is that the rh driver is not certified for use with Dell,HP or IBM for that matter, if we get a support request where I work and the RH driver is used for the qlogic card then customer must install the certified driver from the vendor, this has a lot to do with compabillity with the bios etc, I am not saying that the RH driver is bad it is just unsupported by most vendors. Regards Per At Fredag, 08-01-2010 on 11:06 "Alexander Dalloz" wrote: > Hi > > Not sure if you have done this already but install multipath as the os > sees multiple presented luns which needs to be tied up to one by > multipath also do not use the rh drivers for you qlogic it's not > recommended at all for any storage solutions. > > Per Dear Per, can you please elaborate why the QLogic kernel module shipping with CentOS 5 / RHEL 5 is not recommended? It for sure is documented to be used at least in the NetApp host utilities guide, without any warning to prefer the driver package provided on the QLogic site. And I do not see any problem using it with CentOS / RHEL 5 device-mapper-multipath on a lot of systems. Regards Alexander _______________________________________________ CentOS mailing list CentOS(a)centos.org http://lists.centos.org/mailman/listinfo/centos

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