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34753 discussions

Mount a Xen disk image file
by Dirk H. Schulz 10 Aug '08

10 Aug '08

Hi Folks, I search for a way to mount the .img files virt-install creates for Xen VMs. Using fdisk -lu I found it contains to 2 partitions: > # fdisk -lu /var/lib/xen/images/BaseCentos.img > last_lba(): I don't know how to handle files with mode 81ed > Sie müssen angeben Zylinder. > Sie können dies im Zusatzfunktionsmenü tun. > > Platte /var/lib/xen/images/BaseCentos.img: 0 MByte, 0 Byte > 255 heads, 63 sectors/track, 0 cylinders, zusammen 0 Sektoren > Einheiten = Sektoren von 1 × 512 = 512 Bytes > > Gerät boot. Anfang Ende Blöcke Id System > /var/lib/xen/images/BaseCentos.img1 * 63 208844 104391 83 Linux > /var/lib/xen/images/BaseCentos.img2 208845 8177084 3984120 8e Linux LVM And I can mount the first partition with no problem using the offset (start) from the partition table: > mount -o loop,offset=$((63*512) /PATH/TO/IMAGE.img /MOUNTPOINT But I cannot mount the second partition using the offset of it: > mount -o loop,offset=$((208845*512)) /PATH/TO/IMAGE.img /MOUNTPOINT > mount: you have to specify the file system type Even using ext3, ext2 does not work. I do not think the offset is incorrect - I venture it is because the second partition is LVM (8e). Did anybody out there succeed in mounting an LVM partition out of an image file? Any hint or help is appreciated. Dirk

3 8

Xen and bonding on Centos 5.2
by Dirk H. Schulz 10 Aug '08

10 Aug '08

Hi folks, I am stuck with a weird phenomenon. I have set up two servers as xen servers with bonded interfaces (mode 1). The bond interface works fine on both servers as long as xen is not used. When using xen's network-bridge script (with netdev=bond0), one server works fine without problems, and the other starts upping and downing the slave interfaces of the bond in a very fast manner (several runs per second). Both configurations are identical, the only difference is: - the working server has tg3 nic drivers - the dysfunctional server has e100 nic drivers. Does it really depend on the nic driver if bonding works? And why does it not work in xen, but work fine without xen? What can I do to analyse the problem? I know I could ask this on the xen list, but I fear that this is a redhat/centos specific phenomenon. Any hint or help is appreciated. Dirk

2 2

can't access irc server on xen domU, please help
by Rudi Ahlers 10 Aug '08

10 Aug '08

Hi all, I'm running a CentOS 5.2 server with a FC8 xen domU guest, and an irc server on the FC8 domU guest. For some odd reason, I can't access the irc server on the xen domU guest. >From FC8, when I run netstat -a, I can see irc is listening: netstat -a Active Internet connections (servers and established) Proto Recv-Q Send-Q Local Address Foreign Address State tcp 0 0 *:ircd *:* LISTEN tcp 0 0 *:6668 *:* LISTEN tcp 0 0 *:6669 *:* LISTEN tcp 0 0 *:ftp *:* LISTEN tcp 0 0 192.168.10.:afs3-fileserver *:* LISTEN tcp 0 0 localhost.localdomain:smtp *:* LISTEN tcp 0 0 192.168.10.13:ftp 196-209-84-62-tpr-esr:49615 ESTABLISHED tcp 0 0 *:http *:* LISTEN tcp 0 0 *:ssh *:* LISTEN and running nmap on the localhost looks promising as well: netstat -a Active Internet connections (servers and established) Proto Recv-Q Send-Q Local Address Foreign Address State tcp 0 0 *:ircd *:* LISTEN tcp 0 0 *:6668 *:* LISTEN tcp 0 0 *:6669 *:* LISTEN tcp 0 0 *:ftp *:* LISTEN tcp 0 0 196.34.136.:afs3-fileserver *:* LISTEN tcp 0 0 localhost.localdomain:smtp *:* LISTEN tcp 0 0 196.34.136.55:ftp 196-209-84-62-tpr-esr:49615 ESTABLISHED tcp 0 0 *:http *:* LISTEN tcp 0 0 *:ssh *:* LISTEN Yet, from the outside (either from another PC, or the dom0 itself), I can't connect to the irc ports. I've even disabled iptables on the dom0 altogether, but stil can't connect to it. The only open ports are: PORT STATE SERVICE 80/tcp open http 443/tcp closed https 7001/tcp closed afs3-callback 8000/tcp closed http-alt 8080/tcp closed http-proxy 8081/tcp closed blackice-icecap How do I get this to work? P.S. Sorry for the cross-post, for those of you who are on the centos-virt list as well, I just find that this list is being used more. -- Kind Regards Rudi Ahlers

3 11

New kernel and keyboard shortcuts
by Mark Hull-Richter 09 Aug '08

09 Aug '08

Has anyone else noticed or had a problem with keyboard shortcuts not working properly after the last kernel update? I'm finding on my 64-bit home system that even <alt><f4> no longer works in my terminal windows, and none of the normal keyboard shortcuts in OOo work properly either. Just curious if it's just me.... mhr

1 0

Dual video card, 1 monitor each (ref dual head) CentoS4.6 xorg does only 1 head
by William L. Maltby 09 Aug '08

09 Aug '08

I need to start running a dual head on one of my machines. Eventual target is CentOS 5.x. Decided to test first on my 4.6 setup (eventually it will achieve 5.x). Both machines are fully up to date. The test machine is 4.6, 2 radeon video cards. Searched the web, CentOS site, even bugzilla. This bugzilla entry from a 4.2 system), http://bugs.centos.org/view.php?id=1875 had only a WFM response. I've attached a gzipped text file of pertinent information. Briefly, kudzu did the right thing when I installed the second card. System-config-display also behaved correctly. X start ok, but will only use one head at a time. Adding a second "BusID" so that both cards are explicitly addressed didn't help. When the 2 "BusID" entries are switched, the active screen doesn't move (it's always "Screen0") and the ignored screen ("Screen1") remains the same. The monitor attached to the video card for "Screen0" becomes the active one. Q1: Anyone have a two video card CentOS 4.6 setup working? Q2: Is it working in CentOS 5? Q3: Anyone see something I'm doing wrong? Suggestions? TIA, -- Bill

6 12

Good reference for dkms?
by MHR 09 Aug '08

09 Aug '08

I've just built the nvidia driver for my home machine for the third time and I'd like to put it into a dkms format, but I'm not entirely clear on what goes where to make this work. I googled for a good primer on dkms, but what I'm finding is essentially equivalent to the man page, which, like most Unix/Linux man pages, doesn't really tell you "how to do this from scratch." I'm using nvidia's latest driver, r. 173.14.09, which seems to be more recent than the last one I have from rpmforge (1.0.9755, IIRC), although I'm not sure I really need anything other than the rpmforge version. Should I 1) revert to the rpmforge version and re-add it back into the dkms tree? IIRC, this wasn't that hard to do, 'cuz it was meant to be done in the first place. 2) try to bungle my way through with the newest one from nvidia? Or is there a really good primer on dkms that tells what to put where and how to create a proper dkms.conf file (and where)? Thanks. mhr

3 4

MRTG Problem - no traffic recorded
by Morten Nilsen 09 Aug '08

09 Aug '08

Hi all, I've just recently replaced my old firewall with a new one, running CentOS 5.. Yesterday, I decided to get MRTG up and running again, so I entered sections like this into the mrtg.conf file: Title[vlan10]: Bandwidth usage on tenchi.4th-age.com (Internet) PageTop[vlan10]: <H1>Traffic stats on VLAN 10 (Internet)</H1> Target[vlan10]: `ifconfig vlan10 | /usr/bin/awk '/bytes/{ gsub(/:/, " "); print $3 "\n" $8}'` MaxBytes[vlan10]: 12500000 Options[vlan10]: noinfo, growright, bits WithPeak[vlan10]: wmy The Target is all on one line in the file. This config worked fine on my old firewall, but on the new, I get this in the log files: [root@tenchi mrtg]# head /var/lib/mrtg/vlan10.log 1218175802 -1 -1 1218175802 3 3 3 3 1218175501 3 3 3 3 1218175500 3 3 3 3 When testing, I ran the mrtg command, precisely as it is written in /etc/cron.d/mrtg, and that placed real values where now it says -1, but as soon as the cron job ran, the values became -1 again. I hope someone can shed some light on this problem.. -- Cheers, Morten

2 2

Re: [CentOS] CentOS 5.2 -- how do I choose a wireless network?
by Aleksey Tsalolikhin 08 Aug '08

08 Aug '08

Good answer. Thanks, Spiro! I'll try Ubunto. Aleksey On Tue, Aug 5, 2008 at 9:53 PM, Spiro Harvey, Knossos Networks Ltd <spiro(a)knossos.net.nz> wrote: > > CentOS is aimed as a server distribution, and I don't recommend it for a > home machine. You would do better to look at Fedora or Ubuntu. They are > designed as home distributions and are far better for getting going on a > home network. > > > -- > Spiro Harvey Knossos Networks Ltd > 021-295-1923 www.knossos.net.nz > >

8 15

Stopping setroubleshootd failed
by Lanny Marcus 08 Aug '08

08 Aug '08

This is probably a known issue, but just in case. On my Desktop, I am running SELinux in Permissive mode. When I restart the system, or shut it down, I notice this message: "Stopping setroubleshootd failed". Notice at the end of the dmseg output below, regarding SELinux, there are three (3) identical lines. I don't know if that is normal or not. [lanny@dell2400 ~]$ dmesg |more Linux version 2.6.18-92.1.10.el5 (mockbuild(a)builder16.centos.org) (gcc version 4 .1.2 20071124 (Red Hat 4.1.2-42)) #1 SMP Tue Aug 5 07:41:53 EDT 2008 Security Framework v1.0.0 initialized SELinux: Initializing. SELinux: Starting in permissive mode selinux_register_security: Registering secondary module capability Capability LSM initialized as secondary SELinux: Completing initialization. SELinux: Setting up existing superblocks. SELinux: initialized (dev dm-0, type ext3), uses xattr SELinux: initialized (dev usbfs, type usbfs), uses genfs_contexts SELinux: initialized (dev tmpfs, type tmpfs), uses transition SIDs SELinux: initialized (dev debugfs, type debugfs), uses genfs_contexts SELinux: initialized (dev selinuxfs, type selinuxfs), uses genfs_contexts SELinux: initialized (dev mqueue, type mqueue), uses transition SIDs SELinux: initialized (dev hugetlbfs, type hugetlbfs), uses genfs_contexts SELinux: initialized (dev devpts, type devpts), uses transition SIDs SELinux: initialized (dev eventpollfs, type eventpollfs), uses task SIDs SELinux: initialized (dev inotifyfs, type inotifyfs), uses genfs_contexts SELinux: initialized (dev tmpfs, type tmpfs), uses transition SIDs SELinux: initialized (dev futexfs, type futexfs), uses genfs_contexts SELinux: initialized (dev pipefs, type pipefs), uses task SIDs SELinux: initialized (dev sockfs, type sockfs), uses task SIDs SELinux: initialized (dev cpuset, type cpuset), uses genfs_contexts SELinux: initialized (dev proc, type proc), uses genfs_contexts SELinux: initialized (dev bdev, type bdev), uses genfs_contexts SELinux: initialized (dev rootfs, type rootfs), uses genfs_contexts SELinux: initialized (dev sysfs, type sysfs), uses genfs_contexts audit(1218202140.802:2): policy loaded auid=4294967295 ses=4294967295 SELinux: initialized (dev ramfs, type ramfs), uses genfs_contexts SELinux: initialized (dev hda3, type ext3), uses xattr SELinux: initialized (dev tmpfs, type tmpfs), uses transition SIDs SELinux: initialized (dev binfmt_misc, type binfmt_misc), uses genfs_contexts SELinux: initialized (dev rpc_pipefs, type rpc_pipefs), uses genfs_contexts SELinux: initialized (dev autofs, type autofs), uses genfs_contexts SELinux: initialized (dev autofs, type autofs), uses genfs_contexts SELinux: initialized (dev autofs, type autofs), uses genfs_contexts

1 0

Package request: php, pear: spreadsheet::excel::writer
by Morten Nilsen 08 Aug '08

08 Aug '08

Hello, I am currently using this PEAR package to generate .xls documents in PHP; http://pear.php.net/package/Spreadsheet_Excel_Writer It would be very much appreciated if someone could add it to the repository, as it is always to prefer rpm packages over manually installed ones. -- Cheers, Morten

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