Discuss November 2008

discuss@lists.centos.org

252 participants
254 discussions

Stop the FUD Xen is not deprecated
by Vandaman 05 Dec '08

05 Dec '08

Do people have wet underwear for nothing over XEN? See http://www.redhat.com/promo/qumranet/ <snip> Q: Will Red Hat continue to support and contribute to Xen? A: Yes. Red Hat will support Xen until at least 2014 (seven years after the release of Red Hat Enterprise Linux 5). We are committed to insulating our customers from changes in the infrastructure components and this is why we created an open virtualization management standard (the Libvirt API). This standard is provided in Red Hat products and has been adopted by a number of other vendors (Sun, Novell, Ubuntu, etc.). It allows customers and ISVs to build virtualization management applications, processes and configurations based on a stable API, independent of the underlying virtualization technology. Red Hat continues to be an active member of the Xen development community and is currently working on further integration work between the Xen hypervisor and the Linux kernel. </snip> As far as CentOS is concerned saying Xen is deprecated is jumping the gun. CentOS ships with Xen and as long as upstream supports it, CentOS by extension supports it. Regards, Vandaman.

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Reassemble software RAID
by Kai Schaetzl 03 Dec '08

03 Dec '08

I have a machine on CentOS 5 with two disks in RAID1 using Linux software RAID. /dev/md0 is a small boot partition, /dev/md1 spans the rest of the disk(s). /dev/md1 is managed by LVM and holds the system partition and several other partitions. I had to take out disk sda from the RAID and low level format it with the tool provided by Samsung. Now I put it back and want to reassemble the array. Machine boots fine from sdb and I was able to re-add /dev/sda1 to /dev/md0 easily. However, I can't do the same with /dev/sda2 to /dev/md1 because there's no /dev/md1 anymore and mdadm tells me it doesn't have the RAID superblock. If possible I want to avoid deleting the already existing setup and data. I'm wondering what I shall do next. Can I simply create /dev/md1 as if it was a new array? Is the problem created by the fact that the running system was booted from a logical volume on /dev/sda2? Should I better boot the system from a live CD and then reassemble/create anew /dev/md1? In general, would it be better to *not* put the main system on a logical volume on a RAID partition? (The other logical volumes carry virtual machines.) Thus: /dev/md0 with /boot /dev/md1 with / (no LVM on it) /dev/md2 managed by LVM Kai -- Kai Schätzl, Berlin, Germany Get your web at Conactive Internet Services: http://www.conactive.com

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USB or PCI dialup modem supported by Centos
by Ramon Nieto 02 Dec '08

02 Dec '08

Hello everybody, I've searched google for a while looking for a list of USB or PCI dialup modems supported by CentOS without success. Any information on this subject will be really appreciated. Thank you.

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Neighbour table overflow
by Thomas Dukes 01 Dec '08

01 Dec '08

Just started getting this. I tried the following by adding it to my etc/sysctl.conf: net.ipv4.neigh.default.gc_thresh1 = 4096 net.ipv4.neigh.default.gc_thresh2 = 8192 net.ipv4.neigh.default.gc_thresh3 = 8192 net.ipv4.neigh.default.base_reachable_time = 86400 net.ipv4.neigh.default.gc_stale_time = 86400 That pretty much locked things up. Then I tried another googled solution: echo 256 > /proc/sys/net/ipv4/neigh/default/gc_thresh1 echo 512 > /proc/sys/net/ipv4/neigh/default/gc_thresh2 echo 1024 > /proc/sys/net/ipv4/neigh/default/gc_thresh3 And adding it also to etc/sysctl.conf: net.ipv4.neigh.default.gc_thresh1 = 256 net.ipv4.neigh.default.gc_thresh2 = 512 net.ipv4.neigh.default.gc_thresh3 = 1024 Still not working. Any ideas? TIA

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[CentOS] Apache, SELinux, and document root on a different partition
by Kenneth Porter 01 Dec '08

01 Dec '08

I want to put the document root for an application on a separate paritition that has more space. When I try to configure this I can't access the files in the new location. I've got the SELinux attributes set on the directory and its files, so I'm thinking it's something about the parent path that SELinux doesn't like, but I don't know where that's handled. My partition is mounted to /mnt/bigdisk2, and I put the app in the wbb3tmp subdirectory there: [root@centos wbb3-tmp]# ls -Za drwxr-xr-x apache apache system_u:object_r:httpd_sys_content_t . drwxr-xr-x root root system_u:object_r:file_t .. -rw-r--r-- apache apache system_u:object_r:httpd_sys_content_t WCFSetup.tar.gz -rw-r--r-- apache apache system_u:object_r:httpd_sys_content_t index.html -rw-r--r-- apache apache system_u:object_r:httpd_sys_content_t install.php -rw-r--r-- apache apache system_u:object_r:httpd_sys_content_t test.php [root@centos wbb3-tmp]# pwd /mnt/bigdisk2/wbb3-tmp My Apache VirtualHost block contains this: Alias /wbb3-tmp /mnt/bigdisk2/wbb3-tmp <Directory "/mnt/bigdisk2/wbb3-tmp"> AllowOverride AuthConfig Options Limit Options +Indexes -ExecCGI +FollowSymLinks +MultiViews Order allow,deny Allow from all </Directory> This works if I disable SELinux.

3 6

Mail and list server downtime
by Ralph Angenendt 01 Dec '08

01 Dec '08

Hello, there will be a downtime of the mail and list server tomorrow evening from around 20:00 UTC and a few (hopefully) hours after that. This means that there will be no mail traffic at that time to and from centos.org domains. We need to move away mail from the current machine to a new machine, as our old mailserver is a bit unreliable at the moment (the hardware is showing its age). After the move everything will work exactly as before, only faster, bigger and better. Thanks for your understanding, Ralph

3 2

Sendmail - STARTTLS not appear on one client
by happymaster23 01 Dec '08

01 Dec '08

Hi, I have Sendmail configured to use STARTTLS for authentication. On all internet connections and computers (that I have tested) works connection over encrypted SMTP flawlessly. Today I was setting up mail client on PC of my customer and standardily checked boxes, that I want to use SSL for POP3 and SMTP. Next I wanted to check configuration (by sending email from this mailbox to this mailbox) but it does not work. So I have opened telnet, connected via port 25 and writed "ehlo hostname" and then finded out, that there is missing STARTTLS. Is possible, that some bad configuration on client side (firewall, etc...) can cause this error including that this function is missing in printout of ehlo? POP3S working good. >From Sendmail log (/var/log/maillog): Nov 28 19:31:23 server sendmail[11163]: xxx: xxxxx.jizmorava.adsl-llu.static.bluetone.cz [85.207.xxx.211] did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA Thank you very much

3 2

CentOS 5 - KDE - wireless ?
by Kevin Kempter 01 Dec '08

01 Dec '08

Hi All; How do I enable/configure wireless in CentOS 5 ? I cannot find knetworkmanager anywhere.. Do I need to install another repository ? I did enable rpmfusion with no luck Thanks in advance...

4 3

how can I stress a server?
by Rudi Ahlers 01 Dec '08

01 Dec '08

Hi all, I have a server, with an Intel DG35EC motherboard, Q9300 CPU, 8GB Kingston DDRII RAM which can't take a lot of load. I have 4 XEN VPS's on there, which doesn't consume more than 4GBM RAM at this stage. Yet, the machine sky rockets at some times. I've moved the XEN VPS's to another server, with 4GM RAM, and it doesn't cause the same problems. So, apart from memtest86 how else can I stress test the server to find out what the problem is? -- Kind Regards Rudi Ahlers

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Installing CentOS security updates to RHEL machines? (RHN subscription expired)
by Alexander Farber 30 Nov '08

30 Nov '08

Hello, I hope my question is not annoying. I work as sysadmin at a 400 users firm and we have around 20 CentOS 4/5 servers and VMs and CentOS is awesome, thank you! However we have 4 important SAP-servers running RHEL5 and our RHN subscription has unforunately expired and buying it again is not an option right now. Installing CentOS is not an option too, because we'd have to pay for SAP-reinstall. Has anybody have been in a similar situation and figured out a good way to make "yum update" on RHEL machines to work against CentOS repositories? Regards Alex

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Discuss November 2008