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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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bind-chroot rpm only builds chroot tree?
by Robert Moskowitz 15 Feb '13

15 Feb '13

I just downloaded the bind-chroot rpm and looked into it with Archive manager (so I am lazy), and no files, just the chroot tree. I am assuming there is some script that Archive manager does not show, or I am just missing it, because the ROOTDIR= did get added to /etc/sysconfig/named (and the one in the bind rpm is without this line). Just interesting that if you chroot, you are expected to know that everything needs to be placed there. And they leave the /etc/named.conf there untouched. Seems they should remove this or make it a symlink? And what about /etc/rndc.key? your chrooted bind uses the /var/named/chroot/etc/rndc.key and rndc uses the /etc/rndc.key, or so it seems, so your rndc.key is left unprotected outside of the chroot jail? Am I missing something in the rndc setup with chrooted bind? I am not seeing any special instructions on this in the Redhat documentation.

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chrooted bind -- addition to rsyslog.conf
by Robert Moskowitz 14 Feb '13

14 Feb '13

In /etc/sysconfig/named that gets installed along with bind-chroot there is a comment that basically says: Don't forget to add "$AddUnixListenSocket /var/named/chroot/dev/log" line to your /etc/rsyslog.conf file. All these little touches you need to find out about. But is there any order in rsyslog.conf? Do I just add this line to the end of it?

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motherboard for cents 6.3
by Jerry Geis 14 Feb '13

14 Feb '13

Seems like overnight every motherboard that worked with linux has DROPPED off the face of the earth. Every motherboard I looked at is using the realtek 8111 chipset and a northbridge that is not supported. Example: GIGABYTE GA-970A-DS3, does not work with linux I tried disabling the onboard NIC and using a PCI-E intel card I always use and that would not work either. The north or south bridge is messing with the network card. The card asks for a PXE boot but after centos starts it can no longer find kickstart files, network is messed up. I was using Asus M5A88-M and they are no longer available. Anyway - anyone have a suggestion for and AMD motherboard that works with linux be great if it has onboard video (gaming is not needed), onboard network, SATA nothing super special just "working". Thanks, jerry

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Re: [CentOS] Really changing the hostname
by m.roth＠5-cent.us 14 Feb '13

14 Feb '13

Les Mikesell wrote: > On Thu, Feb 14, 2013 at 12:15 PM, Digimer <lists(a)alteeve.ca> wrote: >> On 02/14/2013 01:13 PM, Digimer wrote: >>> On 02/14/2013 01:11 PM, Robert Moskowitz wrote: >>>> I need to change the host name on a test server, and in the past when I used hostname to change the hostname, it did not seem to change it everywhere. >>>> >>>> I really don't want to do a rebuild just yet, but I have to feel confident that hostname is really changed (reboot is not too much of an issue). >>>> >>>> What is the recommened practice? Other than get it right the first time. >>> >>> To make the change permanent, edit /etc/ssyconfig/network and set the desired hostname after HOSTNAME=. >> >> Sorry, I typo'd that; >> >> # cat /etc/sysconfig/network >> NETWORKING=yes >> HOSTNAME=<your.new.hostname> > > This will get picked up on the next reboot. You will have to use the hostname command to make it take effect immediately, but some > applications only pick it up when they start so things like your login prompt won't change until the next login. Yep, what les says. If you don't reboot, things like syslog/rsyslog won't change it in messages. mark

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A question
by Bassem Sossan 14 Feb '13

14 Feb '13

I'm beginner with Linux... I have found a good resource, it's a book called "Beginning Red Hat Linux 9"... the centos's version that I've installed "centos 6"... Is this book may be compatible with Centos 6 ? Best regards...

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