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Installation of 6.0
by Al Sparks 21 Sep '11

21 Sep '11

Some observations. When I installed 6.0 (base install), the installation interface did not guide me through a network configuration. I do static IP addresses, not DHCP. I ended up manually configuring the various /etc/sysconfig files. I forgot to do the GATEWAY configuration and it took me awhile to figure out why I wasn't able to connect to the server from outside the LAN. I also forgot to do the DNS settings. It's deja-vu all over again, going back to the older Red Hat Linux distros. Anyway, I wasn't able to find a configuration program like "netconfig" to help me out. Seems like a pretty big omission. Any thoughts? Am I missing something? === Al

6 10

selinux policy remnant according to /bin/ls on CentOS 6.0 box
by Jon Detert 21 Sep '11

21 Sep '11

I installed CentOS 6.0 on 2 different x86_64 boxen. Both originally had selinux installed and enabled. I never touched selinux other than to remove as much of it as I could via rpm -e. As far as I can tell, here are the remaining packages that have something to do with it: # rpm -qa | grep -iE 'sel|pol' checkpolicy-2.0.22-1.el6.x86_64 libselinux-2.0.94-2.el6.x86_64 libsepol-2.0.41-3.el6.x86_64 polkit-0.96-2.el6_0.1.x86_64 # Both boxen have those packages. However: 1) box1 still has files in /selinux whereas box2's /selinux is empty; 2) ls -l on box1 shows a '.' at the end of file/directory, which means a SELinux security context applies, according to https://fedoraproject.org/wiki/Fedora_11_FAQ#Why_does_ls_show_a_dot_.28..29… Any idea why box1 still seems to have an selinux policy applied, and how to un-apply it? Thanks, Jon

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mdadm and drive identification?
by David C. Miller 21 Sep '11

21 Sep '11

I have a server that has 16 drives in it. They are connected to a 3ware 9650SE-16ML SATA RAID card. I have the card set to export all the drives as JBOD because I prefer Linux to do the reporting of drive and RAID health . I'm using mdadm to create a RAID6 with a hot spare. Doing this I can take the disks and put them on a completely different SATA controller/computer and still have the RAID intact. My problem is that I have no "for sure" way of matching a drive assigned to one of the /dev/sd[a-z]. Normally I could use a number of methods to match up what /dev/sd[a-z] is to a drives serial number. smartctl, hdparm, udevinfo, /dev/disk/by-uuid, or /dev/disk/by-id. However, the 3ware card obfuscates the drives from the OS and those methods don't work. The only way I know how to get a drives serial number is via the smartctl command like "smartctl -d 3ware,[0-15] -i /dev/twa0", but that does not tell me which sd[a-z] the drive is assigned to. Here is what I have tried. Creating a single large partition with fdisk on each drive as linux autoraid to get a uuid. for some reason the OS assigns the same uuid and only one uuid to the last drive I partition from the 3ware card. Basically all drives on the 3ware card have the same uuid.. Using the /dev/disk/by-id/. For some reason the 3ware card does not always assign the same id to a drive after a reboot. Is there another easy way I can positively ID a drive by serial number and the /dev/sd[a-z] that mdadm sees? Thanks. David.

3 3

eth enumeration order
by Volker Poplawski 20 Sep '11

20 Sep '11

I have installed Centos 6 on a server with two NICs. It so happens that the NIC with the lower ARP adr is assigned 'eth1' and the NIC with the higher ARP 'eth0'. (Not sure if this a bug but it is at least inconvenient) I have modified the udev rules in /etc/udev/rules.d/70-persistent-net.rules by swapping eth0 with eth1 in the NIC's rules. However: the file gets changed on reboot. A third rule is automaticaly added for some reason, for one of the NICs which already has a rule. See below. The system ends up with no network interface set up at all, because the init-script gets confused. So.... How do you specifiy the order in which NICs are enumerated? or at least how to tell centos to stop messing with the 70-persistent-net.rules? Regards .....Volker Contents of /etc/udev/rules.d/70-persistent-net.rules (arps anonymized): (These are the two rules modified by me, assigning eth0/eth1 in ascending arp order) # PCI device 0x8086:0x10d3 (e1000e) (custom name provided by external tool) SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="xx:xx:xx:xx:8f:ea", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0" # PCI device 0x8086:0x1502 (e1000e) (custom name provided by external tool) SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="xx:xx:xx:xx:8f:eb", ATTR{type}=="1", KERNEL=="eth*", NAME="eth1" (This is the rule which gets automaticaly added on reboot) # PCI device 0x8086:0x1502 (e1000e) (custom name provided by external tool) SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="xx:xx:xx:xx:8f:eb", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"

3 4

PDF Reader/Editor for CentOS 5.7 (32 bit)?
by Lanny Marcus 20 Sep '11

20 Sep '11

I had, in the past, a .pdf reader that also permitted me to fill in some information, when I received a .pdf file. I have KPDF installed, but that seems to only have Reader capability. Trying to install xpdf, with yum, I get this dependency error from rpmforge: 1:xpdf-3.02-8.el5.rf.i386 from rpmforge has depsolving problems --> Missing Dependency: libXm.so.4 is needed by package 1:xpdf-3.02-8.el5.rf.i386 (rpmforge) Error: Missing Dependency: libXm.so.4 is needed by package 1:xpdf-3.02-8.el5.rf. Then, if I try to yum install libXm.so.4 I get this error: No package libXm.so.4 available. Received a contract via email and I would like to add some information and send it back via email. If someone can recommend a Package that I can install, that will be appreciated. Hopefully, something as easy to use as what I had before. It just worked. :-) Unfortunately, I cannot remember which package it was. :-) TIA! Lanny http://www.magazines-magazine.com/

12 15

is oprofile working on CENTOS 6.0 ?
by William Reich 20 Sep '11

20 Sep '11

Hi I am trying to use oprofile with centos 6.0. I know that the debug-info for the kernel is not available, so I believe I used the correct switches to account for this. here is my script... # reset everything opcontrol --shutdown rm /root/.oprofile/da* opcontrol --separate=kernel --no-vmlinux opcontrol --event=CPU_CLK_UNHALTED:100000 opcontrol --start sleep 5 opcontrol --reset echo "sleeping now" sleep 20 opcontrol -stop # all done - use the data with opreport... echo " " echo " " When I run this on a CENTOS 6 machine, the machine hangs. There is no visible panic on the console nor the serial port. This is 100% repeatable. I tried multiple machines. I am using a DELL 2850. Any help would be appreciated. wr

1 2

LVM lvresize/lvextend requires some space in /etc to grow a logical volume?
by Johnny Tan 20 Sep '11

20 Sep '11

Side note: In CentOS-6, I noticed a new option in lvresize / lvextend: -r, --resizefs Resize underlying filesystem together with the logical volume using fsadm(8). Nice. Two steps (lvresize and resize2fs) can now be combined into one! Works great. But that has nothing to do with my question, just thought I'd share the discovery. == Anyway, here's the real issue with LVM, at least in CentOS-6: [root@jttest ~]# df Filesystem 1K-blocks Used Available Use% Mounted on /dev/mapper/vg_main-lv_root 1548144 1548144 0 100% / [root@jttest ~]# lvextend -L 2G /dev/vg_main/lv_root /etc/lvm/archive/.lvm_jttest.pp.local_5523_51321310: write error failed: No space left on device Volume group "vg_main" metadata archive failed. /etc/lvm/cache/.cache.tmp: write error failed: No space left on device So I can't extend a logical volume if there's no space in /etc? Granted, I only need to delete like 2k worth of files in the same logical volume as /etc to make the above work, but I don't recall lvresize or lvextend requiring space in /etc to do a resize. Has this always been the case? I don't have any 5.x servers handy to test this with. Can anyone verify? If this is new, this seems less-than-ideal. /etc itself rarely fills up, so, in theory, I could make it its own LV, but that's even less ideal. For now, I'll stick to deleting just enough to do the extend/resize. johnny

4 5

Kickstart mdraid on two disks, from usb key detected as sda instead of sdc...
by John Doe 20 Sep '11

20 Sep '11

Hi, I am trying to adapt my kickstart usb key to optionally auto-setup mdraid on two disks... But I have one server that keeps attaching the usb key to sda instead of sdc... My kickstart creates the raid devices on sdb and sdc partitions; but then I expect it not to work once the key is unplugged and the disks fall back to sda and sdb... Can I just modify mdadm.conf at the end, just before rebooting? What about grub? Thx, JD

1 0

Submitting patches from upstream fixes/bugs
by Trey Dockendorf 20 Sep '11

20 Sep '11

What is the preferred method for submitting patches from upstream projects ? I have two patches for libvirt-0.8.1.el6_0.6. One adds ESX 4.1 support to things like virt-v2v ( http://www.redhat.com/archives/libvir-list/2010-July/msg00480.html) and the second fixes the broken "virsh snapshot-create" ( https://bugzilla.redhat.com/show_bug.cgi?id=727709) All I did really was get them to work with the CentOS 6 version of libvirt. Thanks - Trey

2 4

ekiga
by hadi motamedi 20 Sep '11

20 Sep '11

Dear All I have installed Asterisk on my centos 5.0 and I have two other centos 6.0 and centos 5.6 with ekiga sip client. The centos 6.0 can make successful sip calls but centos 5.6 cannot. Among the Asterisk logs, I found that the centos 6.0 has ekiga 3.2.6 but centos 5.6 has ekiga 2.0.2 . How can I install/upgrade my older ekiga? Thank you

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