Discuss January 2012

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222 participants
221 discussions

Advise on recovering 2TB RAID1
by Fajar Priyanto 29 Jan '12

29 Jan '12

Hi all, I have one drive fails on a software 2TB RAID1. I have removed the failed partition from mdraid and now ready to replace the failed drive. I want to ask for opinion if there is better way to do that other than: 1. Put the new HDD. 2. Use parted to recreate the same partition scheme. 3. Use mdadm to rebuild the RAID. Especially #2 is rather tricky. I have to create an exact partition scheme. Can I just clone the partition table without the data in it using parted? How? Thank you, Fajar.

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Re: [CentOS] Virtual machine => Physical machine - fix screen resolution?
by Mark LaPierre 29 Jan '12

29 Jan '12

On 01/28/2012 09:01 PM, Philip Rhoades wrote: > People, > > I sent this note to the Fedora virtual list so I thought I might try > here . . > > I installed a Fedora 16 x86_64 virtual machine on a Fedora 14 x86_64 > server but used a physical disk (/dev/sdb = /dev/vda) so I could get the > new server going almost completely in virtual mode and then when it was > ready to go, reboot the machine on the new drive. This process went > extremely well (thanks to all the Fedora developers!) but there were a > few glitches left to sort out - one of which was the screen resolution > for both the console and in X. It seems the default virtual screen is > 1024x768 but I need 1280x1024(or 768). I tried adding a vga parameter to > the linux line in the grub.cfg file but that only temporarily changed > the resolution during bootup. xorg.conf doesn't get used much anymore - > do I need to create it for this case? Is there some way to tell Fedora > to rediscover the maximum screen resolution somehow? > > Thanks, > > Phil. Hey Phil, I'm assuming that you are using a graphical desktop. Can you adjust the resolution with System/Preferences/Display? -- _ °v° /(_)\ ^ ^ Mark LaPierre Registerd Linux user No #267004

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Samba Printer Share Access Denied
by Mark LaPierre 29 Jan '12

29 Jan '12

CentOS 6.2 [mlapier@mushroom ~]$ uname -a Linux mushroom.patch 2.6.32-220.4.1.el6.i686 #1 SMP Mon Jan 23 22:37:12 GMT 2012 i686 i686 i386 GNU/Linux [mlapier@mushroom ~]$ Applicable sections of smb.conf: [global] workgroup = MYGROUP server string = Samba Server Version %v log file = /var/log/samba/log.%m max log size = 50 security = user passdb backend = tdbsam load printers = yes cups options = raw printcap name = /etc/printcap printing = cups [printers] comment = All Printers path = /var/spool/samba browseable = no guest ok = yes writable = yes printable = yes available = yes [root@mushroom init.d]# ./smb configtest Syntax OK [root@mushroom init.d]# [root@mushroom init.d]# smbd -V Version 3.5.10-114.el6 [root@mushroom init.d]# [mlapier@mushroom ~]$ rpm -qa | grep samba samba-3.5.10-114.el6.i686 samba-client-3.5.10-114.el6.i686 samba-common-3.5.10-114.el6.i686 samba-winbind-devel-3.5.10-114.el6.i686 samba-domainjoin-gui-3.5.10-114.el6.i686 samba-winbind-clients-3.5.10-114.el6.i686 samba4-libs-4.0.0-23.alpha11.el6.i686 samba-swat-3.5.10-114.el6.i686 samba-doc-3.5.10-114.el6.i686 samba-winbind-3.5.10-114.el6.i686 samba-winbind-krb5-locator-3.5.10-114.el6.i686 [mlapier@mushroom ~]$ [root@mushroom samba]# service smb restart Shutting down SMB services: [ OK ] Starting SMB services: [ OK ] [root@mushroom samba]# tail log.smbd [2012/01/27 22:46:03, 0] smbd/server.c:1140(main) smbd version 3.5.10-114.el6 started. Copyright Andrew Tridgell and the Samba Team 1992-2010 [2012/01/27 22:46:03.703807, 0] smbd/server.c:500(smbd_open_one_socket) smbd_open_once_socket: open_socket_in: Address already in use [2012/01/27 22:46:03.704728, 0] smbd/server.c:500(smbd_open_one_socket) smbd_open_once_socket: open_socket_in: Address already in use [root@mushroom samba]# [mlapier@mushroom etc]$ cat printcap # This file was automatically generated by cupsd(8) from the # /etc/cups/printers.conf file. All changes to this file # will be lost. Samsung-ML-1740|Samsung ML-1740:rm=mushroom.patch:rp=Samsung-ML-1740: HP-Color-LaserJet-cp2025dn|HP Color LaserJet cp2025dn:rm=mushroom.patch:rp=HP-Color-LaserJet-cp2025dn: WorkForce-1100|EPSON WorkForce 1100:rm=mushroom.patch:rp=WorkForce-1100: [mlapier@mushroom etc]$ [mlapier@mushroom init.d]$ rpm -qa | grep cups cups-libs-1.4.2-44.el6.i686 cups-1.4.2-44.el6.i686 gutenprint-cups-5.2.5-2.el6.i686 cups-pk-helper-0.0.4-12.el6.i686 [mlapier@mushroom init.d]$ My file system shares work perfectly. I can see the printers listed on the Win XP client. I can install the printers on the XP machine but I can't print to them. When I double click on the printer icon I get the usual printer manager but on the top bar it states that access is denied. I've tried everything I can think of and everything that I've read on the Internet over the last month but still no joy. I even disabled SElinux. The only thing I see is "Address already in use" error in the log.smbd file. Does anyone see anything in my configuration that doesn't look just right to you? Is there anything else that you need to see? -- _ °v° /(_)\ ^ ^ Mark LaPierre Registerd Linux user No #267004

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Installing CENTOS 6.1 to Intel notebook
by Keith Wilkinson 29 Jan '12

29 Jan '12

I have a notebook with HM65 Express chipset and (internal Core i5 2520M) HD Graphics 3000, but a graphical install of CENTOS 6.1 froze the PC. I was able to install by selecting “Install with basic video driver”, but that left the internal display distorted and the external display not recognized. I found a fix for the problem at http://jehurst.wordpress.com/2011/06/26/rhel-6-for-the-clueless-intel-graph… but wonder if anyone knows if this problem (of graphical install freezing) has been fixed in CENTOS 6.2, or (if not) if RedHat is aware of it.

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Turn off fetchmail warning?
by Timothy Murphy 29 Jan '12

29 Jan '12

Is there any way of turning off the fetchmail warning ---------------------------------- fetchmail: Warning: the connection is insecure, continuing anyways. (Better use --sslcertck!) ---------------------------------- which I get when fetching imap mail from my college department? I know they should get a root certificate, but I'm told they are looking into it, but that could take forever. I know I could just filter out the warnings in .fetchmailrc . But I'm wondering if there is any option in fetchmail to turn them off? I don't see any in the man page. -- Timothy Murphy e-mail: gayleard /at/ eircom.net tel: +353-86-2336090, +353-1-2842366 s-mail: School of Mathematics, Trinity College Dublin

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Booting custom kernels in centOS6.0
by kasi viswanath 28 Jan '12

28 Jan '12

Hi, I'm using the procedure described in building customer kenrels centOS5.0. Except for one step where spec file to comment 25 lines from 638, I did every thing. I got rpm files in ~/rpmbuild/RPMS. After installing kernel-firmeware, kernel, kernel-headers, kernel-devel packages it creates OS entry in /boot/grub/menu.lst following "defaults 0" directive. After reboot: 1. Grub is not showing up new kernel in grub menu 2. Manually removing old kernel title in menu.lst, won't booting new kernel. kernel: 2.6.32.71.el6.x86_64. Are there any issues? thanks and regards, Viswa

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New DRBD packages in CentOS-Testing
by Johnny Hughes 28 Jan '12

28 Jan '12

DRBD Users, There are new DRBD (drbd83) packages for CentOS-5 in the CentOS-Testing repository. The packages are located here: http://dev.centos.org/centos/5/testing/i386/RPMS/ http://dev.centos.org/centos/5/testing/x86_64/RPMS/ http://dev.centos.org/centos/5/testing/SRPMS/ The versions are: drbd83-8.3.12-1.el5.centos* drbd83-kmod-8.3.12-1.el5.centos* Please test these so we can move them into CentOS Extras. NOTE: There are 3 other versions (8.3.9, 8.3.10-1 and 8.3.10-2) that never got moved out of testing and 8.3.8 is currently the version in Extras ... PLEASE, lets get these tested as if they work, people will want them. Thanks, Johnny Hughes

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Can anyone talk infrastructure with me?
by Jason T. Slack-Moehrle 28 Jan '12

28 Jan '12

Hi All, I started a 501c3 (not-for-profit) organization back in February 2011 to deal with information archival. A long vision here, I wont bore you with the details (if you really want to know, e-mail me privately) but the gist is I need to build an infrastructure to accommodate about 2PB of data that is database stuff, stored video, crawl data, static data sets, etc. Right now in my testing of the software I can easily bang down 300+gb a month of data. I have a Comcast business circuit and so far so good with them. I am investigating Sonic.net for a "Business T" solution as they call it. As part of their deal, they want to lease me a "Managed Cisco Router". I know, i know which one? Well none of the Sales people know and they have to find out for me! They also told me that with this router, there is no reason to run my own dedicated firewall. Which I have been investigating recently as well. I do have cisco PIX experience and I am not sure how much of that translates to real world use now-a-days. I have not touched a PIX in 5 years. So I am confused and I would appreciate some advice. So this Cisco device they want to put in front of everything. I then wanted to run my own dedicated firewall (a custom build box probably thanks to John Pierce's advice about pfSense recently). Coming off that dedicated Firewall, I need a DMZ for web-serving, a private VLAN for database servers, etc and a private VLAN for my computers here that I use to do all the work behind the NPO. Here is where I draw some confusion. Where do items such as Varnish Cache, HAProxy go in relationship to firewall, DMZ, etc? HAProxy is a load-balancer, so It should do in front of web-servers so it can decide which web-server to send the traffic to? Varnish Cache is all about caching commonly used resources so it seems that this has to go in front too? Can this be the same box realistically? How does one spec this box out? Database servers and storage servers would go on the private VLAN? I am building a box to store all the data (mysql, video, crawl data, static datasets) and I strongly think it might be a backBlaze POD running CentOS. I know this is not the best list to ask these types of questions on, so if there is a better place besides ServerFault or SuperUser.com, I would appreciate knowing. I just find the folks here have so much knowledge besides CentOS. I look at some of these organizations that talk about their infrastructure like WikiMedia Foundation, StackOverflow and I sort of really become quickly amazed that I could full the garage in my house with equipment easily and my wife wont like that! -Jason

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Cannot remove lvs associated with deleted vm guests
by James B. Byrne 28 Jan '12

28 Jan '12

At the beginning of January I encountered a problem where several vm guests on a single host somehow managed to see the the virtual disks assigned to other guests on the same hosts. I was unable to resolve this situation and shutdown the affected guests after creating new guest instances and moving the services and data off the corrupted guests. I have since removed these guests via virt-manager but all attempts to remove from the host the logical volumes associated with the former VirtIO disks fail. The volumes are considered open by lvremove and nothing I have tried can get them to close for removal. The --force option has no effect on this situation. # /sbin/lvremove -f /dev/vg_vhost01/lv_vm_base Can't remove open logical volume "lv_vm_base" # dmsetup info -c vg_vhost01-lv_vm_base Name Maj Min Stat Open Targ Event UUID vg_vhost01-lv_vm_base 253 5 L--w 2 1 0 LVM-gXMt00E1RDjpSX3INLZ35Prtg66aX36BeAOlKIkmfSNQRNol3Hni920R4YVaZr52 # dmsetup remove vg_vhost01-lv_vm_base device-mapper: remove ioctl failed: Device or resource busy Command failed There are several bugs filed on similar issues and udev is sometimes identified as the culprit. If I kill the udev daemon with T=`pidof -x udevd`; kill $T and rerun the lvremove -f command then I see this change in behaviour: # /sbin/lvremove -f /dev/vg_vhost01/lv_vm_base Found duplicate PV djM23m6YebBQ2xgPh9ORMtdX2iOu9xBQ: using /dev/mapper/vg_vhost01-lv_vm_pas.harte--lyne.cap2 not /dev/mapper/vg_vhost01-lv_vm_pgsql--dbms.harte--lyne.ca_00p2 Found duplicate PV djM23m6YebBQ2xgPh9ORMtdX2iOu9xBQ: using /dev/mapper/vg_vhost01-lv_vm_basep2 not /dev/mapper/vg_vhost01-lv_vm_pas.harte--lyne.cap2 Can't remove open logical volume "lv_vm_base" I need to get this system stable and return the lost disk space to the storage pool. Does anyone have any suggestions as to how to proceed? If I cannot solve this using the available system commands then prudence dictates that I have to re-install the server OS and rebuild all of the vm guests. As these guests have been laboriously transferred from other hosts during the past month this is a task I would rather not have to do. Any help is gratefully accepted. -- *** E-Mail is NOT a SECURE channel *** James B. Byrne mailto:ByrneJB@Harte-Lyne.ca Harte & Lyne Limited http://www.harte-lyne.ca 9 Brockley Drive vox: +1 905 561 1241 Hamilton, Ontario fax: +1 905 561 0757 Canada L8E 3C3

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need help to build livecd and create success iso file but it hang
by ha do 28 Jan '12

28 Jan '12

Hi all my environment: 1/ windows 7 OS system 2/ use virtual box install the host centos system i try to make a centos livecd and i follow the step 1/ create file: vi /etc/yum.repos.d/centos-livecd.repo and the content of file: # Name: CentOS LiveCD repository [livecd] name = CentOS $releasever - LiveCD baseurl = http://www.nanotechnologies.qc.ca/propos/linux/centos-live/$basearch/live enabled=1 protect=0 gpgkey = http://www.nanotechnologies.qc.ca/propos/linux/RPM-GPG-KEY-PGuay2010 2/ yum install livecd-tools syslinux anaconda-runtime 3/ create file alochym.ks and content of file: lang en_US.UTF-8 keyboard us timezone US/Eastern auth --useshadow --enablemd5 selinux --enforcing firewall --disabled repo --name=a-base --baseurl=http://mirror-fpt-telecom.fpt.net/centos/5/os/$basearch repo --name=a-updates --baseurl=http://mirror-fpt-telecom.fpt.net/centos/5/updates/$basearch repo --name=a-extras --baseurl=http://mirror-fpt-telecom.fpt.net/centos/5/extras/$basearch repo --name=a-live --baseurl=http://www.nanotechnologies.qc.ca/propos/linux/centos-live/$basearch/live %packages bash kernel syslinux passwd policycoreutils chkconfig authconfig rootfiles comps-extras xkeyboard-config openssh 4/ run command : LANG=C livecd-creator --config=/mnt/alochym.ks --fslabel=CentOS-mini 5/ download the file CentOS-mini.iso to windows 7 6/ use virtual box create new virtual machine with CentOS-mini.iso as cdrom the log of create livecd : http://pastebin.com/Z5BFASXa the problem is when i use the CentOS-mini.iso with new virtual machine and the virtual manchine hang when automatic boot to 0 second can somebody help me Thank you

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