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Re: [CentOS] More on Re: Really changing the hostname
by Robert Moskowitz 15 Feb '13

15 Feb '13

On 02/15/2013 02:02 PM, Reindl Harald wrote: > > Am 15.02.2013 19:58, schrieb Les Mikesell: >> On Fri, Feb 15, 2013 at 12:49 PM, Reindl Harald <h.reindl(a)thelounge.net> wrote: >>>>> And when you edit ifcfg-eth0 what command restarts the interface? >>>> ifdown eth0 >>>> ifup eth0 >>> oh yeah do this in a ssh session >>> man "service network restart" works and does not lock you out >> ifdown eth0 ; ifup eth0 >> ...works for me. But most of our machines have multiple interfaces >> so I'll usually connect to a different one > ah and all your interfaces are connected to the WAN? > why? > >> while I change a NIC >> setting - and the most common thing would be to change the IP address >> anyway > ah and that is why you suggest > > service NetworkManger stop > chkconfig NetworkManager off > > to somebody which locks him out and even after a cold reboot > comes up without network because you missed "chkconfig network > on" - but not relevant, there would have been no connection to type > it after shutdown NM I just checked this on my new server running network with how it comes 'out of the box'. chkconfig --list shows both NetworkManager and network as on right now. I suppose to future proof myself it would be wise to still run "chkconfig network on"; it hurts nothing if on and could save me if a future release is shipped defaulted off. hmmm. I did set network on in my kickstart to do a netinstall; maybe that is why network is on now? Doesn't matter, I suppose.

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Problem with installing DHCP
by Bassem Sossan 15 Feb '13

15 Feb '13

I'm trying to install DHCP on CentOS 6 "yum install dhcp", but the installation doesn't complete... I get a message that tell me that there is a conflict with file from package dhclient...

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DNS search in anaconda
by Tom Brown 15 Feb '13

15 Feb '13

Hi Does anyone know if its possible to set a search domain within anaconda to use during kickstart? I'd rather not have to set a FQDN for a certain service as its location specific that is dependent on SSL and therefore the certs. I cant see anything in the docs listed but i thought i'd ask cheers

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Rudi Ahlers invites you to Freelancer.com
by Rudi Ahlers 15 Feb '13

15 Feb '13

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Disable notification in gnome
by Ibrahim Yurtseven 15 Feb '13

15 Feb '13

Hi all. The Ghnome-notifications are annoying me. it pops up, when firefox or transmission finished a download, when claws and sylpheed recieved a mail. balh. this is annoying. how can i disable the notofication per default for my user? (the other users want to keep the notification) -- Ibrahim "Arastirmacilar" Yurtseven The web is what you make of it

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Re: [CentOS] Questions about software RAID, LVM.
by SilverTip257 15 Feb '13

15 Feb '13

On Thu, Feb 14, 2013 at 11:58 PM, Ted Miller <tedlists(a)sbcglobal.net> wrote: > On 02/04/2013 06:40 PM, Robert Heller wrote: > > I am planning to increase the disk space on my desktop system. It is > > running CentOS 5.9 w/XEN. I have two 160Gig 2.5" laptop (2.5") SATA > drives > > in two slots of a 4-slot hot swap bay configured like this: > > > > Disk /dev/sda: 160.0 GB, 160041885696 bytes > > 255 heads, 63 sectors/track, 19457 cylinders > > Units = cylinders of 16065 * 512 = 8225280 bytes > > > > Device Boot Start End Blocks Id System > > /dev/sda1 * 1 125 1004031 fd Linux raid > autodetect > > /dev/sda2 126 19457 155284290 fd Linux raid > autodetect > > > > Disk /dev/sdb: 160.0 GB, 160041885696 bytes > > 255 heads, 63 sectors/track, 19457 cylinders > > Units = cylinders of 16065 * 512 = 8225280 bytes > > > > Device Boot Start End Blocks Id System > > /dev/sdb1 * 1 125 1004031 fd Linux raid > autodetect > > /dev/sdb2 126 19457 155284290 fd Linux raid > autodetect > > > > sauron.deepsoft.com% cat /proc/mdstat > > Personalities : [raid1] > > md0 : active raid1 sdb1[1] sda1[0] > > 1003904 blocks [2/2] [UU] > > > > md1 : active raid1 sdb2[1] sda2[0] > > 155284224 blocks [2/2] [UU] > > > > unused devices:<none> > > > > That is I have two RAID1 arrays: a small (1Gig) one mounted as /boot > > and a larger 148Gig one that is a LVM Volume Group (which contains a > > pile of file systems, some for DOM0 and some that are for other VMs). > > What I plan on doing is getting a pair of 320Gig 2.5" (laptop) SATA > > disks and fail over the existing disks to this new pair. I believe I > > can then 'grow' the second RAID array to be like ~300Gig. My question > > is: what happens to the LVM Volume Group? Will it grow when the RAID > > array grows? > > Not on its own, but you can grow it. I believe the recommended way to do > the LVM volume is to > partition new drive as type fd > LVM is 8e Software RAID is fd > install new PV on new partition (will be new, larger size) > make new PV part of old volume group > migrate all volumes on old PV onto new PV > remove old PV from volume group > > You have to do this separately for each drive, but it isn't very hard. Of > course your boot partition will have to be handled separately. > > This is what I said ;) http://lists.centos.org/pipermail/centos/2013-February/131917.html > > > Or should I leave /dev/md1 its current size and create a > > new RAID array and add this as a second PV and grow the Volume Group > > that way? > > That is a solution to a different problem. You would end up with a VG of > about 450 GB total. If that is what you want to do, that works too. > > He has to leave /dev/md1 at its current size ... it's a raid1. > > The documentation is not clear as to what happens -- the VG > > is marked 'resisable'. > > > > sauron.deepsoft.com% sudo pvdisplay > > --- Physical volume --- > > PV Name /dev/md1 > > VG Name sauron > > PV Size 148.09 GB / not usable 768.00 KB > > Allocatable yes > > PE Size (KByte) 4096 > > Total PE 37911 > > Free PE 204 > > Allocated PE 37707 > > PV UUID ttB15B-3eWx-4ioj-TUvm-lAPM-z9rD-Prumee > > > > sauron.deepsoft.com% sudo vgdisplay > > --- Volume group --- > > VG Name sauron > > System ID > > Format lvm2 > > Metadata Areas 1 > > Metadata Sequence No 65 > > VG Access read/write > > VG Status resizable > > MAX LV 0 > > Cur LV 17 > > Open LV 12 > > Max PV 0 > > Cur PV 1 > > Act PV 1 > > VG Size 148.09 GB > > PE Size 4.00 MB > > Total PE 37911 > > Alloc PE / Size 37707 / 147.29 GB > > Free PE / Size 204 / 816.00 MB > > VG UUID qG8gCf-3vou-7dp2-Ar0B-p8jz-eXZF-3vOONr > > > Doesn't look like anyone answered your question, so I'll tell you that the > answer is "Yes". > > Ted Miller > > > _______________________________________________ > CentOS mailing list > CentOS(a)centos.org > http://lists.centos.org/mailman/listinfo/centos > -- ---~~.~~--- Mike // SilverTip257 //

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I want an advice
by Bassem Sossan 15 Feb '13

15 Feb '13

Hello I've changed from Ms Windows 2008 R2 to CentOS 6 recently, and there are many aspects to learn in relation to command line ( Bash scripting, package system managing, file system and so on )... I need to apply as much as I can of Network Infrastructure knowledge ( DNS, DHCP and Virtualization .... ) concepts using CentOS 6 GUI... I know that I must learn dealing with linux using command tools and that will come, but it has much more of time, so, Am I forced as a learner to follow command line tools before going to GUI or I can get a good knowledge and experience by implementing my skills on GUI ? So sorry to pothering.... All the best...

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routing problem?
by Natxo Asenjo 15 Feb '13

15 Feb '13

hi, at home I have setup a kvm virtualization lab. I have a layer 3 switch, a host with 3 nics and centos 6.3. In the layer 3 switch I have setup a couple of vlans: vlan 1 (default), 5 (quarantaine) and 10 (out-of-band-management). nic0 is configured in the switch as a trunk interface that sees all vlans. nic2 is an access port on vlan 5 and nic1 is not yet in the picture ;-) eth0 is bridged to br0. It also has the host default gateway. I have also created eth0.5, br0.5, eth0.10 and br0.10 interfaces to add vm's to vlan 5 and 10 and that works, I can successfully create vms and assign them to br0.5 or br0.10 and they get ip's from a dchp server in the correct network and their traffic is correctly routed in the switch (inter vlan routing works). I can access the vms from my workstation on on vlan 1. Now I configure eth2 with an ip address in the range of vlan 5 (in the switch it is an access port in vlan 5). This is the ifcfg-eth2 file: DEVICE="eth2" HWADDR="00:15:17:51:B8:AB" IPV6INIT="no" BOOTPROTO=none MTU="1500" NM_CONTROLLED="no" ONBOOT="yes" IPADDR=192.168.5.10 NETMASK=255.255.255.0 # GATEWAY=192.168.5.254 The GATEWAY parameter is now commented out, but it does not matter. The interface on the virtualization host comes up all right. But I cannot access it from my workstation on vlan 1 when accessing it to vlan 5. >From the virtualization host I can reach the switch vlan 5 interface which is its gateway. From the switch I can also ping the interface eth2. The routing table on the virt host: # route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 192.168.5.0 0.0.0.0 255.255.255.0 U 0 0 0 eth2 192.168.0.0 0.0.0.0 255.255.255.0 U 0 0 0 br0 169.254.0.0 0.0.0.0 255.255.0.0 U 1003 0 0 eth2 169.254.0.0 0.0.0.0 255.255.0.0 U 1016 0 0 br0 169.254.0.0 0.0.0.0 255.255.0.0 U 1018 0 0 br_v10 169.254.0.0 0.0.0.0 255.255.0.0 U 1020 0 0 br_v5 0.0.0.0 192.168.0.254 0.0.0.0 UG 0 0 0 br0 Do you have any tips on how to reach vlan 5 on the virt host from vlan 1? -- Groeten, natxo

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Selinux blocking bind access to named/data and slave directories
by Robert Moskowitz 15 Feb '13

15 Feb '13

I was getting permission errors (seen in /var/log/messages) in accessing these two directories within my chroot tree. I was pulling out what little hair I have, as the permissions were identical to those on my Centos 5.5 server. So I switched selinux into permissive mode and now I have /var/named/chroot/var/named/data/named.run and my ..../named/slave/ stubs. What is the selinux magic to allow bind to write here?

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Questions about software RAID, LVM.
by Robert Heller 15 Feb '13

15 Feb '13

I am planning to increase the disk space on my desktop system. It is running CentOS 5.9 w/XEN. I have two 160Gig 2.5" laptop (2.5") SATA drives in two slots of a 4-slot hot swap bay configured like this: Disk /dev/sda: 160.0 GB, 160041885696 bytes 255 heads, 63 sectors/track, 19457 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sda1 * 1 125 1004031 fd Linux raid autodetect /dev/sda2 126 19457 155284290 fd Linux raid autodetect Disk /dev/sdb: 160.0 GB, 160041885696 bytes 255 heads, 63 sectors/track, 19457 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sdb1 * 1 125 1004031 fd Linux raid autodetect /dev/sdb2 126 19457 155284290 fd Linux raid autodetect sauron.deepsoft.com% cat /proc/mdstat Personalities : [raid1] md0 : active raid1 sdb1[1] sda1[0] 1003904 blocks [2/2] [UU] md1 : active raid1 sdb2[1] sda2[0] 155284224 blocks [2/2] [UU] unused devices: <none> That is I have two RAID1 arrays: a small (1Gig) one mounted as /boot and a larger 148Gig one that is a LVM Volume Group (which contains a pile of file systems, some for DOM0 and some that are for other VMs). What I plan on doing is getting a pair of 320Gig 2.5" (laptop) SATA disks and fail over the existing disks to this new pair. I believe I can then 'grow' the second RAID array to be like ~300Gig. My question is: what happens to the LVM Volume Group? Will it grow when the RAID array grows? Or should I leave /dev/md1 its current size and create a new RAID array and add this as a second PV and grow the Volume Group that way? The documentation is not clear as to what happens -- the VG is marked 'resisable'. sauron.deepsoft.com% sudo pvdisplay --- Physical volume --- PV Name /dev/md1 VG Name sauron PV Size 148.09 GB / not usable 768.00 KB Allocatable yes PE Size (KByte) 4096 Total PE 37911 Free PE 204 Allocated PE 37707 PV UUID ttB15B-3eWx-4ioj-TUvm-lAPM-z9rD-Prumee sauron.deepsoft.com% sudo vgdisplay --- Volume group --- VG Name sauron System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 65 VG Access read/write VG Status resizable MAX LV 0 Cur LV 17 Open LV 12 Max PV 0 Cur PV 1 Act PV 1 VG Size 148.09 GB PE Size 4.00 MB Total PE 37911 Alloc PE / Size 37707 / 147.29 GB Free PE / Size 204 / 816.00 MB VG UUID qG8gCf-3vou-7dp2-Ar0B-p8jz-eXZF-3vOONr -- Robert Heller -- 978-544-6933 / heller(a)deepsoft.com Deepwoods Software -- http://www.deepsoft.com/ () ascii ribbon campaign -- against html e-mail /\ www.asciiribbon.org -- against proprietary attachments

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