Discuss November 2013

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160 participants
172 discussions

Re: [CentOS] disk cloning ?
by hadi motamedi 11 Nov '13

11 Nov '13

>i pretty clear explained you to shrink the last partition >and after that you can safely ignore the typical difference >of physical disks Sorry . You mean using "resize2fs" for this purpose ? What is the most safe procedure that can be done on the source hard disk without losing any data ?

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Re: [CentOS] disk cloning ?
by hadi motamedi 11 Nov '13

11 Nov '13

> > the response below was pretty clear > __________________________________________________ > >>> buy a bigger target drive? >>> >> Thank you for your help. So I will try to buy a larger target drive.

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Re: [CentOS] disk cloning ?
by hadi motamedi 11 Nov '13

11 Nov '13

Excuse me, You mean I need to buy a larger disk ? Please comment.

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Re: [CentOS] disk cloning ?
by hadi motamedi 11 Nov '13

11 Nov '13

ok . I will obey the rule.

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Re: [CentOS] disk cloning ?
by hadi motamedi 11 Nov '13

11 Nov '13

On 11/11/13, Reindl Harald <h.reindl(a)thelounge.net> wrote: > > > Am 11.11.2013 11:52, schrieb hadi motamedi: >> On 11/11/13, Vishesh kumar <linuxtovishesh(a)gmail.com> wrote: >>> I think below command will serve your purpose. >>> >>> #dd if=/dev/sdb of=/dev/sdc conv=noerror,sync >>> >> Sorry. It quit with the following error : >> "no space left on device" >> What can I do next? > > buy a bigger target drive? > > > Sorry . Both are 40GB . Is it sufficient ?

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Installing CentOS via USB thumbdrive
by Joseph Spenner 11 Nov '13

11 Nov '13

I've been poking at this for quite a while, and have never been able to get it to work. I've found a couple links with some partial truths: http://syslint.com/syslint/how-to-make-a-usb-boot-disk-for-centosrhel-from-… http://brakkee.org/site/2013/05/09/creating-a-usb-install-for-centos-6-4/ The first one talks about converting a standard iso to a 'hybrid' image, using: 'isohybrid'. But it then instructs the reader to make a vfat partition on the thumbdrive, and DD the image to that partition. This seemed odd to me, since the image itself should have all that info. I've used hybrid images before, such as Linux Mint, and was simply able to dd directly to the device itself, ie: dd if=/path/to/hybrid.iso of=/dev/sdb (where sdb is the thumbdrive). But, I went along with it, and it failed-- unable to find 'isolinux.bin'. I've read this error is due to old/incompatible firmware, but I've booted other thumbdrive hybrid-built images many times, and have never seen this except in CentOS installations. So, I tried doing a dd directly to the thumbdrive device, rather than the partition. This actually looked like it was going to work. I got to the initial installer page, and proceeded through the Language and Keyboard questions. It then forgot where itself was, and asked me where the media for installation was. I selected Hard Drive, and /dev/sda1 showed up as default. I hit enter, and it continued further. But then it again forgot where the media was, and couldn't find the installation media. The second URL/instruction wouldn't boot at all. Has anyone successfully installed via USB? I remember reading some multi part instructions where the USB drive is formatted with some special tools, often involving Windows, and various files need to be copied to the USB drive. But I was hoping we were passed that by now. But then again, Dell firmware updates still want me to make a DOS bootable floppy. So, I'm usually not surprised when I hear something like this. :) Thanks! Regards, Joseph Spenner If life gives you lemons, keep them-- because hey.. free lemons. "~heart~ Sticker" fixer: http://microflush.org/stuff/stickers/heartFix.html

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how to calculate mail storage/traffic used
by Götz Reinicke - IT Koordinator 11 Nov '13

11 Nov '13

Hi, we have to setup a server which gets a copy of all messages send and received by our mailserver as a 1:1 copy. Mails send to multiple recipients should be calculated and saved per user. (great if you usually have lost of mails send to groups of people.) So no dedublication should be used here. (e.g. save the message and refer the different recipients to it.) How can I calculate the current traffic in the best way to extrapolate the amount of space to be planed for the new server? We think to have a couples of days to be saved. Thanks for any hint or comment. Regards Götz -- Götz Reinicke IT-Koordinator Tel. +49 7141 969 82 420 Fax +49 7141 969 55 420 E-Mail goetz.reinicke(a)filmakademie.de Filmakademie Baden-Württemberg GmbH Akademiehof 10 71638 Ludwigsburg www.filmakademie.de Eintragung Amtsgericht Stuttgart HRB 205016 Vorsitzender des Aufsichtsrats: Jürgen Walter MdL Staatssekretär im Ministerium für Wissenschaft, Forschung und Kunst Baden-Württemberg Geschäftsführer: Prof. Thomas Schadt

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Strange unexplainable CUPS problem after upgrade to 5.10
by Robert Heller 10 Nov '13

10 Nov '13

I manage a bunch of workstations at the Wendell Free Library. They are all diskless, boot via PXE and mount all of their file systems via NFS from a server. All of the machines are 32-bit and run CentOS (fully up-to-date running 5.10). There are two printers with queues managed on the server. The server 'shares' these printers on the local LAN (eg with all of the workstations). After the upgrade to 5.10, *one* of the machine no longer sees the printers. *Nothing* is different about its configuration files, since these files are mounted via NFS from the server, *like all of the other workstations*. The other workstations all see the printers shared by the server. I don't understand what is going on here. And cannot find the problem. lpstat -t on the server yields: scheduler is running system default destination: BlackandWhiteLaserjet device for BlackandWhiteLaserjet: socket://192.168.1.246:9100 device for Officejet_Color: socket://192.168.1.253 BlackandWhiteLaserjet accepting requests since Tue 19 Jun 2012 03:27:17 PM EDT Officejet_Color accepting requests since Tue 24 Jul 2012 04:43:33 PM EDT printer BlackandWhiteLaserjet is idle. enabled since Tue 19 Jun 2012 03:27:17 PM EDT printer Officejet_Color is idle. enabled since Tue 24 Jul 2012 04:43:33 PM EDT lpstat -t on the bum workstation yields: lpstat: No destinations added. lpstat: No destinations added. lpstat: No destinations added. lpstat: No destinations added. scheduler is running no system default destination and lpstat -t on a working workstation yields: scheduler is running system default destination: BlackandWhiteLaserjet device for BlackandWhiteLaserjet: ipp://192.168.1.254:631/printers/BlackandWhiteLaserjet device for Officejet_Color: ipp://192.168.1.254:631/printers/Officejet_Color BlackandWhiteLaserjet accepting requests since Sun 10 Nov 2013 10:26:03 AM EST Officejet_Color accepting requests since Sun 10 Nov 2013 10:26:04 AM EST printer BlackandWhiteLaserjet is idle. enabled since Sun 10 Nov 2013 10:26:03 AM EST printer Officejet_Color is idle. enabled since Sun 10 Nov 2013 10:26:04 AM EST The server's /etc/cups/cupsd.conf looks like this: LogLevel debug2 SystemGroup sys root admin # Allow remote access Port 631 Listen /var/run/cups/cups.sock # Enable printer sharing and shared printers. Browsing On BrowseOrder allow,deny # (Change '@LOCAL' to 'ALL' if using directed broadcasts from another subnet.) BrowseAllow @LOCAL BrowseAddress @LOCAL DefaultAuthType Basic <Location /> # Allow shared printing and remote administration... Order allow,deny Allow all </Location> <Location /admin> Allow from localhost Allow from 192.168.1.27 Allow from 192.168.1.28 Allow from 192.168.1.29 Allow from 192.168.1.5 # Allow remote administration... Order allow,deny Allow all </Location> <Location /admin/conf> AuthType Basic Require user @SYSTEM Allow localhost # Allow remote access to the configuration files... Order allow,deny Allow all </Location> <Policy default> <Limit Send-Document Send-URI Hold-Job Release-Job Restart-Job Purge-Jobs Set-Job-Attributes Create-Job-Subscription Renew-Subscription Cancel-Subscription Get-Notifications Reprocess-Job Cancel-Current-Job Suspend-Current-Job Resume-Job CUPS-Move-Job> Require user @OWNER @SYSTEM Order deny,allow </Limit> <Limit Pause-Printer Resume-Printer Set-Printer-Attributes Enable-Printer Disable-Printer Pause-Printer-After-Current-Job Hold-New-Jobs Release-Held-New-Jobs Deactivate-Printer Activate-Printer Restart-Printer Shutdown-Printer Startup-Printer Promote-Job Schedule-Job-After CUPS-Add-Printer CUPS-Delete-Printer CUPS-Add-Class CUPS-Delete-Class CUPS-Accept-Jobs CUPS-Reject-Jobs CUPS-Set-Default> AuthType Basic Require user @SYSTEM Order deny,allow </Limit> <Limit CUPS-Authenticate-Job> Require user @OWNER @SYSTEM Order deny,allow </Limit> <Limit All> Order deny,allow </Limit> </Policy> and the cupsd.conf (shared by ALL of the workstations) looks like this: # # "$Id: cupsd.conf.in 7199 2008-01-08 00:16:30Z mike $" # # Sample configuration file for the Common UNIX Printing System (CUPS) # scheduler. See "man cupsd.conf" for a complete description of this # file. # MaxLogSize 2000000000 # Log general information in error_log - change "info" to "debug" for # troubleshooting... LogLevel debug # Administrator user group... SystemGroup sys root # Allow remote access Port 631 Listen /var/run/cups/cups.sock # Only listen for connections from the local machine. #Listen localhost:631 #Listen /var/run/cups/cups.sock # Show shared printers on the local network. Browsing On BrowseOrder allow,deny # (Change '@LOCAL' to 'ALL' if using directed broadcasts from another subnet.) BrowseAllow @LOCAL BrowseAllow 192.168.1.27 BrowseAllow 192.168.1.28 BrowseAllow 192.168.1.29 BrowseAllow 192.168.1.5 BrowseAllow 192.168.1.254 BrowseAllow 10.163.1 BrowseAddress @LOCAL # Default authentication type, when authentication is required... DefaultAuthType Basic # Restrict access to the server... <Location /> Order allow,deny Allow localhost Allow from 192.168.1.27 Allow from 192.168.1.28 Allow from 192.168.1.29 Allow from 192.168.1.5 Allow from 192.168.1.254 Allow from 10.163.1 </Location> # Restrict access to the admin pages... <Location /admin> Order allow,deny Allow localhost Allow from 192.168.1.27 Allow from 192.168.1.28 Allow from 192.168.1.29 Allow from 192.168.1.5 Allow from 192.168.1.254 </Location> # Restrict access to configuration files... <Location /admin/conf> AuthType Default Require user @SYSTEM Order allow,deny </Location> # Set the default printer/job policies... <Policy default> # Job-related operations must be done by the owner or an administrator... <Limit Send-Document Send-URI Hold-Job Release-Job Restart-Job Purge-Jobs Set-Job-Attributes Create-Job-Subscription Renew-Subscription Cancel-Subscription Get-Notifications Reprocess-Job Cancel-Current-Job Suspend-Current-Job Resume-Job CUPS-Move-Job> Require user @OWNER @SYSTEM Order deny,allow </Limit> # All administration operations require an administrator to authenticate... <Limit CUPS-Add-Modify-Printer CUPS-Delete-Printer CUPS-Add-Modify-Class CUPS-Delete-Class CUPS-Set-Default> AuthType Default Require user @SYSTEM Order deny,allow </Limit> # All printer operations require a printer operator to authenticate... <Limit Pause-Printer Resume-Printer Enable-Printer Disable-Printer Pause-Printer-After-Current-Job Hold-New-Jobs Release-Held-New-Jobs Deactivate-Printer Activate-Printer Restart-Printer Shutdown-Printer Startup-Printer Promote-Job Schedule-Job-After CUPS-Accept-Jobs CUPS-Reject-Jobs> AuthType Default Require user @SYSTEM Order deny,allow </Limit> # Only the owner or an administrator can cancel or authenticate a job... <Limit Cancel-Job CUPS-Authenticate-Job> Require user @OWNER @SYSTEM Order deny,allow </Limit> <Limit All> Order deny,allow </Limit> </Policy> # # End of "$Id: cupsd.conf.in 7199 2008-01-08 00:16:30Z mike $". # -- 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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logical volume and drive names after mirroring a centos installation via rsync
by Peter Peltonen 10 Nov '13

10 Nov '13

I have a working CentOS5 installation on server A's first SATA drive (sda). I had an empty SATA drive on that server (sdb). I was asked to mirror the installation of server B (installed on first SATA drive, sda), also running CentOS5, to the second drive (sdb) of server A. I am unsure what should be done after mirroring to get the new system boot. What I have done already: - On server A/sdb I created the same partition layout and a little bit bigger logical volumes as on server B/sda plus created the filesystems (130G / fs and 200M /boot fs). The volume group and logical volumes have different names. I have mounted the new volumes on server A. - From server B/sda I rsynced all data to server A/sdb (excluding /dev/*,/proc/*,/sys/*,/tmp/*,/run/*,/mnt/*,/media/*,/lost+found) whitle most services were stopped on server B Now I would need to figure out how to boot to the CentOS installation on server A/sdb and I would like to ask about a few details: - I am confused about the logical volume names: which ones should I use on the new server's fstab, the old ones (rsynced from server B/sda) or the ones I used when creating the logical volumes from server A? If I need to use the new ones, should I update the names also somewhere else than fstab? - As the new installation will boot from sdb instead of sda, do I need to update this information somewhere (like /boot/grub/device.map) ? - How do I install grub on the second drive? Do I simply command from the A/sda installation: grub-install /dev/sdb ? - And to access this new grub I just mark the second drive as the boot drive in BIOS and boot, yes? - If I also wanted to boot to the new A/sdb system by using the grub in A/sda installation, what should the entry in /boot/grub/menu.lst look like, do I just change the hd(0,0) parameter to hd(1,0) and edit correct kernel and initrd values? Regards, Peter

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Install to internal USB?
by Lists 10 Nov '13

10 Nov '13

Saw a trick today, wondering if anybody else had done/tried this? Assume you have a 1U rackmount with 4 front-accessed drive bays, and you want all four bays for a 4-disk RAID5 storage. The idea is to use an internal USB adapter and a couple of bigger USB thumb drives to install to, RAID 1 style, freeing up all your external drive bays. At first, I didn't think that a thumb drive would hold enough for the O/S, but in actual production use for a file server with 14 TB of redundant storage, the OS actually uses less than 6 GB! Here's the internal USB adapter specifically mentioned: http://www.amazon.com/gp/product/B007PODI1W I'd be concerned about getting a higher quality drive than the $10 givaways at Staples; Anybody here ever tried this?

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Discuss November 2013