Discuss October 2014

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199 participants
220 discussions

DHCPv6 - requesting "other" information
by Mike Mohr 09 Oct '14

09 Oct '14

Hello; I've run into a rather interesting problem on CentOS 7. According to sysconfig.txt (part of the initscripts documentation), I can set the following variables in ifcfg-ethX: DHCPV6C="yes" DHCPV6C_OPTIONS="-S" I've done so, but nothing is populated to /etc/resolv.conf and so DNS does not work. Interestingly, if I remove the latter option, an IPv6 address is added to the relevant interface. Packet dumps indicate that the required DNS information is being sent over the wire, so this appears to be a bug in the IPv6 DHCP software. Running the following command by hand yields similar results: $ dhclient -6 -S -v -v eth1 i.e. there are informational messages printed indicating that a DHCPv6 response was received successfully. Packet dumps again confirm that DNS information is being sent over the wire, but is not being used by the DHCP client application. Is this a known issue, and is there a way to fix the problem? All the best, Michael

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Centos laptop support
by Frank Cox 09 Oct '14

09 Oct '14

Today I found myself in need of a laptop to run Centos on. And that simple statement led to an all-day odyssey. My original plan was to purchase a laptop and install Centos 6 on it. I went to Staples and tried booting it on every model of laptop that they had in the store. They all come with Windows 8 installed, and for the edification of anyone who doesn't know this (I didn't until today) you have to conduct a real song and dance to get to the bios settings on one of those things: boot windows move mouse pointer to the top right corner of the screen move down to setting menu (gear) that shows up click on power off icon Hold shift key and left-click on "restart" it goes to the troubleshooting screen click on advanced troubleshooting click on "change uefi settings" now we get to the bios set secure boot off set legacy boot priority And then you can boot from a USB flash drive. *whew* (It's easy to put it back afterward, just go into the bios and tell it set to defaults, save and exit.) Anyway, I tried booting a Centos 6 Live CD image on a usb flash drive on every single model of laptop they had in stock and no joy on any of them -- they either hung altogether, started booting and hung at some point along the way, started a continuous cycle of start booting, reset, start booting again, or kernel panicked. Every last one. I then tried a Centos 7 Live CD image on another usb flash drive and then the third machine that I tried it on (Lenovo Ideapad S400 Touch) worked. So I bought that one and have now wiped Windows off of its hard drive and installed Centos 7 so it now looks and acts like a real computer. I never would have thought that it would take all bloody day to purchase one laptop. (And I'm going to be having nightmares about that Windows Boot Manager thing.) Since it has now become amazingly difficult to get a laptop if you're not planning to use Windows, at least around here, I'm wondering what the rest of you fine folks do when it comes to purchasing a laptop? Next time this comes up, I'd rather not have to spend all day on something that used to take fifteen minutes. -- MELVILLE THEATRE ~ Real D 3D Digital Cinema ~ www.melvilletheatre.com

28 63

virsh list hangs
by Matt Garman 09 Oct '14

09 Oct '14

I followed the wiki[1] to create a KVM virtual machine using bridged network on CentOS 6.5. It seemed to work fine on initial setup. However, after a boot, it doesn't auto-start the VMs, or at least, something has to timeout (a *very* long time, on the order of 15--30 minutes) before they can be started. Shortly after boot, if I go into "virsh", then do a "list", it just hangs. Likewise, if I go into "virt-manager", it just hangs "connecting". Kernel version is: 2.6.32-431.29.2.el6.x86_64 Relevant package versions: libvirt.x86_64 0.10.2-29.el6_5.12 libvirt-client.x86_64 0.10.2-29.el6_5.12 libvirt-python.x86_64 0.10.2-29.el6_5.12 python-virtinst.noarch 0.600.0-18.el6 virt-manager.x86_64 0.9.0-19.el6 virt-top.x86_64 1.0.4-3.15.el6 virt-viewer.x86_64 0.5.6-8.el6_5.3 qemu-img.x86_64 2:0.12.1.2-2.415.el6_5.14 qemu-kvm.x86_64 2:0.12.1.2-2.415.el6_5.14 CPU is a Xeon E3-1230v3. I have the virtualization setting enabled in the BIOS. I googled on this, and saw a bunch of talk about two years ago regarding issues with the libvirt packages having a deadlock bug. But I think the versions of the relevant packages that I have installed are new enough to have fixes for that. Anyone ever fought this before? Thanks! [1] http://wiki.centos.org/HowTos/KVM

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A little help with default resolution of CentOS7 and Panasonic TV
by Nathan Valentine 09 Oct '14

09 Oct '14

Hi, everyone. tldr: How in the heck do I force CentOS7 to boot to a low/conservative GDM resolution? Hoping someone can lend a hand getting CentOS7 to sync to my Panasonic Vierra 42' TV. It worked fine in CentOS6.5 but since installing I boot to a GDM background with no login prompt. I can SSH into the node and configure multiuser runlevel but that's not fun at all. ;) Here's the output of xrandr: # systemctl get-default graphical.target # xrandr -display \:0 -q Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192 VGA1 disconnected (normal left inverted right x axis y axis) HDMI1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 698mm x 392mm 1920x1080 60.0* 59.9 24.0 24.0 1920x1080i 60.1 60.0 1280x720 60.0 59.9 1440x480i 60.1 60.1 60.1 720x480 60.0 59.9 640x480 60.0 59.9 DP1 disconnected (normal left inverted right x axis y axis) HDMI2 disconnected (normal left inverted right x axis y axis) HDMI3 disconnected (normal left inverted right x axis y axis) DP2 disconnected (normal left inverted right x axis y axis) DP3 disconnected (normal left inverted right x axis y axis) # xrandr -display \:0 --output HDMI1 --mode 640x480 # echo $? 0 # /bin/systemctl restart gdm.service # echo $? 0 So setting to something very conservative doesn't make a difference nor do any of the other detected modes. I also tried bouncing the TV to see if that would help. Nada. -- --- V

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can I check the mac address on DHCP from my command line
by Dan Hyatt 09 Oct '14

09 Oct '14

Hi, I have an interesting problem. I want to be able to verify that my hostname, ipaddress, and mac address are correct in the DNS/DHCP. I have the values, how do I compare. I am able to use NSLOOKUP for the hostname=ip confirmation How do I do the ip addresss = mac address comparison I tried arp and a few other things. Almost everything on google says either to logon to DHCP (which I do not own) or use arp, which is not giving the desired results. I provided the mac address, ip address, and host name I want to find out if a missed entry might be causing the pxe boots and network problems I am having to fail. Dan

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(no subject)
by elizabeth Benedict 09 Oct '14

09 Oct '14

-- Sent from Gmail Mobile

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(no subject)
by elizabeth Benedict 09 Oct '14

09 Oct '14

-- Sent from Gmail Mobile

1 0

CentOS 7 remove items on screen
by Jerry Geis 09 Oct '14

09 Oct '14

How can I remove the four items on screen? Applications, Places home trash from the command line? I'd prefer to remove the top panel and bottom panel all together if possible, but they can stay - I just don't want anything showing on the screen. searched all around for kiosk mode gnome3 etc.. not finding anything good for CentOS7. Was able to do this in CentOS 6 can't believe they took out functionality. Any way to "not" have those menu items and not have icons on the main screen? Thanks jerry

7 8

CentOS 7 kernel console under KVM?
by Chris Adams 08 Oct '14

08 Oct '14

Is there a way to get GRUB2 and the kernel to run a "serial" console under KVM? I'm running a Fedora 20 desktop, with libvirt-managed VMs. When I run a CentOS 6 VM, I can set both the boot loader and kernel up to use ttyS0 and get a console compatible with "virsh console". When I try the same with a CentOS 7 VM, it doesn't work. If I set it to ttyS0, I just don't get anything. I read that I should use hvc0 instead (no idea how to set the boot loader to use that); when I set that on the kernel command line, the kernel crashes during boot with: kernel tried to execute NX-protected page - exploit attempt? (uid: 0) BUG: unable to handle kernel paging request at ffffffff81a4cfec IP: [<ffffffff81a4cfec>] vty_init+0x174/0x174 PGD 18d3067 PUD 18d4063 PMD 3d9e1063 PTE 8000000001a4c163 If I don't do either, I can add a getty on hvc0 with "systemctl enable serial-getty(a)hvc0.service", but that doesn't get me the boot loader or kernel messages. -- Chris Adams <linux(a)cmadams.net>

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CentOS 7 and nfs
by m.roth＠5-cent.us 08 Oct '14

08 Oct '14

First time firing up NFS on a CentOS 7 box. Under 5 or 6, service nfs start started *everything* (rpc, etc). Based on trying that, and doing some googling, is it the case that it does *not* do everything in 7, and I do have to start the pieces manually? mark

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Discuss October 2014