Discuss February 2013

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198 discussions

Help Requested: KVM VM configuration on Centos 6.3
by Sanjay Arora 25 Feb '13

25 Feb '13

Hello I am trying to install KVM based VMs on my machine. First Timer...little idea on actually configuring related networking related issues. Am planning to follow this howto: http://www.howtoforge.com/virtualization-with-kvm-on-a-centos-6.3-server My trial machine is a server cum desktop with two network ports..eth0 is normally used for LAN & Internet access...eth1 is reserved for use with LTSP which is to be configured later. I need my VMs to be reachable from the internet by ssh & vnc etc. required ports will be forwarded from the Internet router. I propose to use subnet 10.0.1.0/24 for my virtual machines. Can someone please advise the content of bridge configuration file at /etc/sysconfig/network-scripts/ifcfg-br0, as given in the howto? The two bridges ltspbr0 & virbr0 shown below, are created by packages installed & not by me, so if any modifications are required in them...I need to know. Also, please advise if it is possible to get the VMs to use a 3G usb device for Internet access through the host machine Network Manage, in case Internet access through eth0 is down? Though this is not a priority at this stage, as I am just learning to use my first VM, but I'd like this feature if it is not too difficult. With regards. Sanjay. ifconfig output: [root@Swayam ~]# ifconfig eth0 Link encap:Ethernet HWaddr E0:69:95:77:A7:F3 inet addr:10.0.0.101 Bcast:10.0.0.255 Mask:255.255.255.0 inet6 addr: fe80::e269:95ff:fe77:a7f3/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:5120 errors:0 dropped:0 overruns:0 frame:0 TX packets:5506 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:4205139 (4.0 MiB) TX bytes:684760 (668.7 KiB) Interrupt:20 Memory:fe600000-fe620000 eth1 Link encap:Ethernet HWaddr 00:60:52:0C:0B:DE UP BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 b) TX bytes:0 (0.0 b) Interrupt:16 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:155 errors:0 dropped:0 overruns:0 frame:0 TX packets:155 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:59335 (57.9 KiB) TX bytes:59335 (57.9 KiB) ltspbr0 Link encap:Ethernet HWaddr AE:41:A9:3D:FE:A3 inet addr:172.31.100.254 Bcast:172.31.100.255 Mask:255.255.255.0 inet6 addr: fe80::ac41:a9ff:fe3d:fea3/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:73 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 b) TX bytes:14407 (14.0 KiB) virbr0 Link encap:Ethernet HWaddr 52:54:00:86:BD:15 inet addr:192.168.122.1 Bcast:192.168.122.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:45 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 b) TX bytes:11636 (11.3 KiB)

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Force CentOS 6.3 to discover new video card
by David McGuffey 24 Feb '13

24 Feb '13

I want to add a new video card that will drive multiple monitors. Current installation of CentOS 6.3 x86_64 is working well with the hdmi output of the motherboard. Once I install the new video card, how do I force 6.3 to discover and configure it? Seems with 6.0 and newer, system-config-display is gone and replaced with a combination of udev and xrandr. I'm not familiar with these and don't want to mess up a working system. Tips/pointers to some decent guidance/how-to docs would be appreciated. DaveM

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Audio Editor
by Mark LaPierre 24 Feb '13

24 Feb '13

Hey All, I need some advice. I need an application, that will work with CentOS 6.3, that I can use to edit audio files. I've used Audacity in the past but it has compatibility issues with CentOS 6.3 that I would prefer to avoid. I've spent a couple of hours perusing the Add/Remove Software tool where I found the Gnome Sound Recorder, but that tool doesn't offer any editing capability as far as I can tell. Please, if you make a suggestion, also include the name of the repository where that application can be found. -- _ °v° /(_)\ ^ ^ Mark LaPierre Registered Linux user No #267004 https://linuxcounter.net/ ****

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NFS mount auto remount in case of problems.
by Rafał Radecki 24 Feb '13

24 Feb '13

Hi All. I have a setup in which I have two servers serving nfs share. The nfs service is made highly available with pacemaker. When the primary server goes down the secondary starts nfs service. Service IP is floating between servers but they have NO "shared" storage/filesystem so NFS state/connection information in case of failover is lost. I have two clients. When the failover from primary to secondary occurs the mount is stale and I need to manually remount the share. Is there a way in linux/CentOS to automatically remount nfs share in such case? Or should I just write a script which (for example) check /proc/mounts and execute it from crontab? I am curious if it can be done with "standard" linux services (automounter?) ;) Best regards, Rafal Radecki.

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centos 5 with xfs root?
by Eero Volotinen 24 Feb '13

24 Feb '13

Hi List, Is it possible to install centos 5 with xfs root and how to do it? -- Eero

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Re: [CentOS] Warning: Your BIOS is broken
by Robert Moskowitz 24 Feb '13

24 Feb '13

On 02/22/2013 03:04 PM, Reindl Harald wrote: > > Am 22.02.2013 20:58, schrieb Robert Moskowitz: >> Kernel param. I really should have caught that. >> >> So I was all ready to edit grub.conf and then slapped my hand. >> You TEST it out first, adding the command at boot time. ARGH! > one option > >> Once before (5+ years back) I had to add a kernel param and did it wrong and >> it was a big recovery challenge > what is the challenge? > there is no difference add or remove a param at boot If you get the option wrong and the system will now not boot? Then you have to boot from a recovery CD, mount your harddrve /boot and edit out the change from grub.conf and try again. All the time you SHOULD have been working on something else. > >> But as I read up on this option, it does not sound like something I want >> to globally turn off just to stop a supposedly annoying >> message (if they have indeed worked around it, and my new DNS server is running with this OK) > and you looked at the other options? > "intel_iommu=igfx_off" maybe a good idea > > intel_iommu= [DMAR] Intel IOMMU driver (DMAR) option > on > Enable intel iommu driver. > off > Disable intel iommu driver. > igfx_off [Default Off] > By default, gfx is mapped as normal device. If a gfx > device has a dedicated DMAR unit, the DMAR unit is > bypassed by not enabling DMAR with this option. In > this case, gfx device will use physical address for > DMA. > forcedac [x86_64] > With this option iommu will not optimize to look > for io virtual address below 32 bit forcing dual > address cycle on pci bus for cards supporting greater > than 32 bit addressing. The default is to look > for translation below 32 bit and if not available > then look in the higher range. > strict [Default Off] > With this option on every unmap_single operation will > result in a hardware IOTLB flush operation as opposed > to batching them for performance. > sp_off [Default Off] > By default, super page will be supported if Intel IOMMU > has the capability. With this option, super page will > not be supported. > I will look at these closely and figure out what course to test. The sabbath is almost here, so got a hard stop time.

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About CentOS & RH References
by Bassem Sossan 23 Feb '13

23 Feb '13

Hello Since CentOS is a clone of RedHat, can I ask about the depeandable references guides of RedHat that are produced by RedHat itself, such as RH033 and so on... I need to know which is the latest copyright of this suit ( RH033, RH133 and RH253 ) Thanks in advaned

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Firefox 17.0.3 New Tab
by Mark LaPierre 23 Feb '13

23 Feb '13

Hey Y'll, Where might I enter a complaint about the new tabs showing a tile of recent web sites visited. I don't like that. I would like to change that setting but I don't see anything in the preferences to adjust. -- _ °v° /(_)\ ^ ^ Mark LaPierre Registered Linux user No #267004 https://linuxcounter.net/ ****

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How to re-enable Adobe Flash in Firefox
by David McGuffey 23 Feb '13

23 Feb '13

Mozilla seems to have disabled Adobe Flash in a recent update. I have one 6.3 Desktop load that I need flash. when directed to the Adobe site and download the latest version, yum tells me I have the latest version for x86_64 already installed. I must keep the wife happy with Facebook and YouTube--and if the wife isn't happy, no one in the house is happy. How do I re-enable flash? DaveM

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problem building partitionable RAID-1 on Centos-6
by Fred 23 Feb '13

23 Feb '13

Trying to install Centos6 on my system (it's been running C5 for years). I've got a pair of drives, so I'm trying to use RAID-1. Previously I used a procedure where each partition was part of a separate RAID device, but this time I'm trying the HOWTO from the Centos WIKI on making a partitionable RAID pair. I've been having a lot of problems, but have also been working thru them. but t his latest one has me stumped, I'd appreciate some advice. Booting encounters a panic when trying to mount the RAID subsystem. you can see an image of it at users.rcn.com/fredricksmith/panic.JPG. Looks as if it's trying to boot from md127. there ain't no such critter, where'd it get the idea it could boot from there? or more importantly, how can I solve it? thanks! I may have to revert to the other method, but I figured this one was worth a try. Fred

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Discuss February 2013