Discuss December 2011

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207 participants
173 discussions

Static routes with a metric?
by Matt Garman 18 Dec '11

18 Dec '11

Hi, How can I define static routes to be created at boot time with a specific metric? I have two NICs that ultimately end up at the same peer, but literally go through two completely different networks. IOW, each NIC connects to a different layer 3 device. Also, note that the machine actually has three total NICs: the third is the owner of the default route. The two mentioned above are for a specialized sub net. What I basically need to be able to do is this: route add -host h1 gw g1 metric 0 route add -host h1 gw g2 metric 10 Notice that everything is the same except the gateway and metric. I could put this in /etc/rc.local, but was wondering if there's a cleaner way to do it in e.g. the network-scripts directory. Thanks, Matt

4 7

how to find source of data loss / corruption
by Rudi Ahlers 18 Dec '11

18 Dec '11

Hi, 2 websites, hosted on 2 different CentOS 5.7 servers (one being very new, about 3 weeks old) keeps loosing data - but it's more like it's corrupted than being deleted. For example, a photo would be uploaded last night and today when we checked it, it doesn't show on the website. So we check if the file is on the server, and exists but is 0KB in size. Last night it still worked fine. The photo is 482Kb in size. The first time this happened we thought it was due to a bug with CentOS 5.7 + EXT4 + quotas (there's a bug open for this) and since the server's console kept giving errors about possible data corruption we thought it would be best if we move everything to a more stable platform. So we brought a new server, setup CentOS 5.7 + ext3 + quotas (which has been working fine on all our servers for a long time) and moved the data across. A few days down the line and I still see this happening. I'm out of ideas and hope someone could shed some light on the matter. I've checked some suggested search results, but couldn't find any issues with the HDD according to SMART. The servers' both have 4GB RAM and 8Core CPU's.Neither RAM, nor CPU usage is high. Both are setup with RAID10 across 4 entrerprise HDD's, one server has software RAID and the new one hardware RAID. So even when we changed the RAID subsystem it still happens. -- Kind Regards Rudi Ahlers SoftDux Website: http://www.SoftDux.com Technical Blog: http://Blog.SoftDux.com Office: 087 805 9573 Cell: 082 554 7532

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CentOS 5.7 gives me a blank screen after bootup
by Rudi Ahlers 18 Dec '11

18 Dec '11

Hi all, I have an odd problem, for which I couldn't find any suggestions on google. A CentOS 5.7x64 gives me a blank screen on bootup, both to the 17" LCD monitor connected to the VGA port, and to the KVMOVIP device built-into the server, I can see the GRUB boot loader, and everything booting up, upto the point where it says "Waiting for driver initialization.", then it goes blank - both on the LCD and the KVM. Does anyone know how to fix this? It does the same whether I boot into the CentOS, or XEN kernel, or in single user mode. First few lines of /etc/grub.conf: # initrd /initrd-version.img #boot=/dev/md0 default 0 timeout=5 splashimage=(hd0,0)/grub/splash.xpm.gz hiddenmenu title CentOS (2.6.18-274.7.1.el5xen) root (hd0,0) kernel /xen.gz-2.6.18-274.7.1.el5 dom0_mem=786M module /vmlinuz-2.6.18-274.7.1.el5xen ro root=/dev/LVM01/root nofb module /initrd-2.6.18-274.7.1.el5xen.img title CentOS (2.6.18-274.7.1.el5) root (hd0,0) kernel /vmlinuz-2.6.18-274.7.1.el5 ro root=/dev/LVM01/root nofb initrd /initrd-2.6.18-274.7.1.el5.img root@zaxen02:[~]$ uname -a Linux zaxen02 2.6.18-274.7.1.el5xen #1 SMP Thu Oct 20 17:06:34 EDT 2011 x86_64 x86_64 x86_64 GNU/Linux root@zaxen02:[~]$ cat /etc/redhat-release CentOS release 5.7 (Final) -- Kind Regards Rudi Ahlers SoftDux Website: http://www.SoftDux.com Technical Blog: http://Blog.SoftDux.com Office: 087 805 9573 Cell: 082 554 7532

4 7

vsftpd Configuration
by Al Sparks 18 Dec '11

18 Dec '11

Is there a way to configure vsftpd to limit where you can chdir to? === Al

2 1

hal, gnome.. custom mount options for vfat storage devices
by wwp 17 Dec '11

17 Dec '11

Hello there, w/ my CentOS6 (up-to-date), running GNOME, I'm struggling with HAL and mount options for my USB storage devices. According to what I'm reading from: http://www.linuxfromscratch.org/blfs/view/svn/general/hal.html My old policies in /etc/hal/fdi/policy/ are ignored (and this is true!). Apparently I should edit my custom mount options through gconf-editor (in /system/storage/default_options/vfat/mount_options) but whatever I set here or in /usr/share/hal/fdi/policy/10osvendor, I see definitely no effect to mount options. Roughly, I'm trying to force mount options like storage location, flush or not, sync or not, shortname=, etc.) to my vfat-formatted USB sticks. Any hint? Am I looking at wrong configurations? BTW, should I worry about uhelper=udisks, does it mean that hal is irrelevant for what I want? Regards, -- wwp

1 0

Monitoring services
by Kenneth Porter 17 Dec '11

17 Dec '11

What's available to remotely monitor services? What I'd like is something that can run scripts for each service to connect to a port and verify that it's up, and then send me an SMS message (phone text) to let me know which, if any, are down. Also, does a script exist that checks all the services listed by chkconfig and reports those that should be up but are down?

11 18

Network Situation
by Gene Poole 17 Dec '11

17 Dec '11

In my personal environment, I've got 7 machines running, with 4 of those machines running various flavors of Linux (CentOS 5 x86_64; Fedora 15 x86_64; Fedora 14 i686). Based upon some issues with the Fedora 15 x86_64 machine I'm considering dropping Fedora 15 in favor of CentOS 6.1. My questions are: On the networking side, has a there been a move to change the ethernet names from eth0 to em1? After install, can I change from NetworkManager to plain network? On my CentOS 5 machine I'm running VMware Server 2 and would like to move to KVM virtualization on the Fedora 15/CentOS 6.1 box. Is the level of KVM comparable between Fedora 15 and CentOS 6? If I install CentOS 6.0 and sometime later upgrade to CentOS 6.2, will the fact that I'm running software raid-1 on the /boot partition cause me grief? Will the fact that I'm running software raid-1 and LVM that was defined under Fedora 12 cause me grief? Are there any caveats moving from Fedora 15 to CentOS 6? Any advise? Thanks, Gene Poole + It's impossible for everything to be true. +

4 3

java installation failure
by e-letter 16 Dec '11

16 Dec '11

Readers, Openjdk and ibm java versions have failed to install, all reporting a bad elf, e.g. ./ibm-java-i386-sdk-7.0-0.0.bin Preparing to install... Extracting the JRE from the installer archive... Unpacking the JRE... Extracting the installation resources from the installer archive... Configuring the installer for this system's environment... strings: '/lib/libc.so.6': No such file Launching installer... ./ibm-java-i386-sdk-7.0-0.0.bin: /tmp/install.dir.4696/Linux/resource/jre/bin/java: /lib/ld-linux.so.2: bad ELF interpreter: No such file or directory ./ibm-java-i386-sdk-7.0-0.0.bin: line 2506: /tmp/install.dir.4696/Linux/resource/jre/bin/java: Success This problem is occurring because the default openjdk could not run davmail, either 32 or 64 bit versions. Any advice please?

6 10

UUID for network cards
by Helmut Drodofsky 16 Dec '11

16 Dec '11

Hello, with CentOS 6, my new server created an UUID entry in ifcfg-eth0 - additional to HWADDR entry. Up to CentOS 5 the connection to the netwark card was defind only by HWADDR. Now I have a new network card. How can I get the correct UUID? The server connects correct the network with the updated HWADDR without any UUID. Why do I need an UUID? Thank you for help in advance. Best Regards Helmut Drodofsky

3 2

installing gnome, CentOS 6.1
by m.roth＠5-cent.us 15 Dec '11

15 Dec '11

I just rebuilt a box to 6.1 for a user. Shortly after I delivered, she came up to ask about gnome; it had come up as KDE. I looked at the login screen, and in the session type, saw previous, custom, kde, and default. When I investigated, I found not all 7,532,340 gnome packages were installed. Googling for responses only in the last month, I found a lot of groupinstall "GNOME Desktop Environment", as opposed to what I put in our PXEboot file months ago, "GNOME Desktop Environment (RPM Fusion Free)". That didn't work either, and after a bit more googling, found people saying groupinstall Desktop. So, is upstream so GNOMEly that the rest of the desktops/window managers are just chopped liver? mark, annoyed at having to change the ks.cgi *again*

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Discuss December 2011