Discuss July 2014

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211 participants
226 discussions

Convert "bare partition" to RAID1 / mdadm?
by Lists 30 Jul '14

30 Jul '14

I have a large disk full of data that I'd like to upgrade to SW RAID 1 with a minimum of downtime. Taking it offline for a day or more to rsync all the files over is a non-starter. Since I've mounted SW RAID1 drives directly with "mount -t ext3 /dev/sdX" it would seem possible to flip the process around, perhaps change the partition type with fdisk or parted, and remount as SW RAID1? I'm not trying to move over the O/S, just a data paritition with LOTS of data. So far, Google pounding has resulted in howtos like this one that's otherwise quite useful, but has a big "copy all your data over" step I'd like to skip: http://sysadmin.compxtreme.ro/how-to-migrate-a-single-disk-linux-system-to-… But it would seem to me that a sequence roughly like this should work without having to recopy all the files. 1) umount /var/data; 2) parted /dev/sdX (change type to fd - Linux RAID auto) 3) Set some volume parameters so it's seen as a RAID1 partition "Degraded". (parted?) 4) ??? Insert mdadm magic here ??? 5) Profit! `mount /dev/md1 /var/data` Wondering if anybody has done anything like this before... -Ben

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Initial Boot from 6.3 minimal halts with strange video display
by James B. Byrne 29 Jul '14

29 Jul '14

I am using a Leveno M58 (model CTO7483 from 2008) for C6/7 experimentation purposes. The thing has a dual core and ~4Gb RAM with a (newly installed) 500GB HDD. I successfully installed CentOS-6.5-minimal from a freshly burned, and verified, DVD from and ISO image whose SHA has been checked and passed. everything about the display was normal throughout that process. When the system boots from disk then I get the normal display up to the point that the kernel is selected (whether by hand or automatically). I can edit the kernel command line and otherwise use the pre-boot selector facility. After that point the monitor, a BenQ 17" LCD, immediate goes into what I can only describe as a psychedelic snow field with two narrow black bands surrounding a broader white band displayed at the top of the screen and a single narrower black band at the bottom. I have tried booting into RL3 by appending a 3 to the end of the kernel command but this has not apparent effect on the outcome. Any suggestions on how to proceed? -- *** 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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[OT] Leveno HDD caddies
by James B. Byrne 29 Jul '14

29 Jul '14

Never mind. One can flex the caddy sufficiently to pop the drive. Although this is definitely not the supported procedure. The case is marked by the vendor with 'Non-Return Hard Drive Machine'. -- *** 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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screensaver in C7
by Fred Smith 29 Jul '14

29 Jul '14

I'm at the stage of poking at a C7 install in Vbox, and am struggling to figure out how to control the screensaver. there doesn't seem to be a gnome screensaver package (like there was in gnome2), and I can't find any installed packages that control it. gconf-editor doesn't have anything that looks promising... how does one control the screensaver in Gnome 3? thanks! -- ---- Fred Smith -- fredex(a)fcshome.stoneham.ma.us ----------------------------- The Lord is like a strong tower. Those who do what is right can run to him for safety. --------------------------- Proverbs 18:10 (niv) -----------------------------

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exim-mysql without MySQL support from epel
by Fosforo 29 Jul '14

29 Jul '14

# head -1 /etc/centos-release CentOS release 6.5 (Final) Anyone using exim with MySQL support from epel without compiling direct from sources? I installed both packages below from epel: Installing: exim x86_64 4.72-5.el6 epel 1.2 M exim-mysql x86_64 4.72-5.el6 epel 24 k # rpm -qa | grep exim exim-mysql-4.72-5.el6.x86_64 exim-4.72-5.el6.x86_64 The .so seems to be included: # locate lookup | grep mysql /usr/lib64/exim/4.72-5.el6/lookups/mysql.so but no suppport builtin in the binary: # exim -bV | grep Lookup Lookups (built-in): lsearch wildlsearch nwildlsearch iplsearch cdb dbm dbmnz dnsdb dsearch ldap ldapdn ldapm nis nis0 nisplus passwd sqlite Am I doing something wrong? -- []s Fosforo ------------------------------------------------------------- "Se eu tiver oito horas pra cortar uma arvore, passarei seis afiando meu machado." -Abraham Lincoln -------------------------------------------------------------

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Try KDE Plasma Workspaces
by Wes James 29 Jul '14

29 Jul '14

I installed KDE Plasma Workspaces on centos 7 in virtualbox. I didn't find in any settings panel or during login a way to use it. I googled to see how to use it, but there are some that say do this but then someone says no do this (editing some files). I've used some linux distros that allow you to choose during login which to use. Since I don't see it at login after a reboot, is there a gui or a file to edit to allow me to try it? Thanks, -wes

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Re: [CentOS] Balancing IRQs
by Jatin Davey 29 Jul '14

29 Jul '14

On 7/29/2014 12:03 PM, Reindl Harald wrote: > Am 29.07.2014 08:16, schrieb Jatin Davey: >> From the above output i can see that all the interrupts are hitting the >> cpu0 and thats why it is used more than any other core in the system. >> >> Can someone please help me in distributing the interrupts across all the >> cores so that all are used which will eventually result in a better >> performance of my system > yum install irqbalance > chkconfig irqbalance on > service irqbalance start > > anything above is out of your scope because it's the kernels job > Thanks Reindl, I will try out irqbalance and see if it helps. Appreciate your response in this regard. Thanks Jatin

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Balancing IRQs
by Jatin Davey 29 Jul '14

29 Jul '14

Hi All I am using the following Linux version for my application: **************************************** [root@localhost ~]# uname -a Linux localhost.localdom 2.6.18-164.el5 #1 SMP Thu Sep 3 03:28:30 EDT 2009 x86_64 x86_64 x86_64 GNU/Linux **************************************** **************************************** [root@localhost ~]# cat /etc/*release CentOS release 5.4 (Final) **************************************** When my application is running on the server i can see only one core being used heavily while the other cores are not being used much. My application has a major workload is collecting data from the eth0 interface and then doing a lot of processing with the data in the database. So i can say that the Disk I/O and Network I/O are the major contributors towards the workload. from the /proc/interrupts file i can see the following: **************************************************** [root@localhost ~]# cat /proc/interrupts CPU0 CPU1 CPU2 CPU3 0: 16084980 0 0 0 IO-APIC-edge timer 1: 141 0 0 0 IO-APIC-edge i8042 6: 5 0 0 0 IO-APIC-edge floppy 7: 0 0 0 0 IO-APIC-edge parport0 8: 0 0 0 0 IO-APIC-edge rtc 9: 0 0 0 0 IO-APIC-level acpi 12: 251 0 0 0 IO-APIC-edge i8042 51: 2410224 0 0 0 IO-APIC-level ioc0 59: 11358257 0 0 0 IO-APIC-level eth0 NMI: 0 0 0 0 LOC: 16086147 16090336 16090320 16089691 ERR: 0 MIS: 0 **************************************************** From the above output i can see that all the interrupts are hitting the cpu0 and thats why it is used more than any other core in the system. Can someone please help me in distributing the interrupts across all the cores so that all are used which will eventually result in a better performance of my system. Appreciate your response in this regard. Thanks Jatin

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How can I connect CentOS7 via xdmcp?
by Kosuke Yagi 29 Jul '14

29 Jul '14

Dear all, Does any one success to connect CentOS7 via xdmcp? I've tried, but not yet succeeded. 1) CentOS7 with Development and Creative workstation 2) Disabled SELinux by editing /etc/selinux/config 3) Disabled firewalld by systemctl disable firewalld 4) Enabled xdmcp by editing /etc/gdm/custom.conf Adding "Enable=true" in [xdmcp] section 5) reboot 7) connect from windows7 PC with Xming-6.9.0.31 "One window" mode with xdmcp connection -> This is not working. How I can do next step? Additional information, I can open single Xterm window through Xming "Multiple windows" mode, but I can't open gnome-terminal with same way. I guessed this means thomething wrong in gnome or gdm working witn remote X or xdmcp. But I have no idea to resolve it. Best regards, Kosuke Yagi

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Re: [CentOS] CentOS Digest, Vol 114, Issue 28
by Dinakar M 28 Jul '14

28 Jul '14

hi friends, i am getting error for kvm virtualization as below , kindly share any if solutions Mount unknown file system type’DM_snapshot_cow’ kernel panic -not syncing :attempt to kill init thanks and regards, dina On Mon, Jul 28, 2014 at 1:00 PM, <centos-request(a)centos.org> wrote: > Send CentOS mailing list submissions to > centos(a)centos.org > > To subscribe or unsubscribe via the World Wide Web, visit > http://lists.centos.org/mailman/listinfo/centos > or, via email, send a message with subject or body 'help' to > centos-request(a)centos.org > > You can reach the person managing the list at > centos-owner(a)centos.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of CentOS digest..." > > > Today's Topics: > > 1. Re: success with Z97-based boards? (Edward M) > 2. wireless inteface configure as bridge (Benjamin Fernandis) > 3. Re: wireless inteface configure as bridge (Alexander Dalloz) > 4. How to Stop the Image URL in apache (Shital Sakhare) > 5. How can I connect CentOS7 via xdmcp? (Kosuke Yagi) > 6. Re: How to Stop the Image URL in apache (Peter) > 7. Re: How to Stop the Image URL in apache (Gopu Krishnan) > 8. Re: How to Stop the Image URL in apache (Shital Sakhare) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Sun, 27 Jul 2014 21:41:26 -0700 > From: Edward M <edwardm5000(a)gmail.com> > Subject: Re: [CentOS] success with Z97-based boards? > To: centos(a)centos.org > Message-ID: <53D5D476.5090602(a)gmail.com> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > On 07/26/14 09:11, Devin Reade wrote: > > Has anyone had success running CentOS on Z97-based motherboards? > > The plan is to use CentOS 7 on this system. > > > > Devin > > > > _______________________________________________ > > CentOS mailing list > > CentOS(a)centos.org > > http://lists.centos.org/mailman/listinfo/centos > > > > Centos 7 benchmarks were done on a Z97-HD3 motherboard. > > http://www.phoronix.com/scan.php?page=article& > item=centos_scientific_70&num=1 > > > ------------------------------ > > Message: 2 > Date: Mon, 28 Jul 2014 14:49:39 +1200 > From: Benjamin Fernandis <benjo11111(a)gmail.com> > Subject: [CentOS] wireless inteface configure as bridge > To: CentOS mailing list <centos(a)centos.org> > Message-ID: > < > CAARrgqxdu6VeM+ztuOqx_bkCB_EEFzn1aARR4eCFo6q_bTNzyA(a)mail.gmail.com> > Content-Type: text/plain; charset=UTF-8 > > Hi, > > I m using centos 7 in laptop and kvm as virtualization to run windows guest > vm.Currently i m using NAT as default setting for guest vm, my internet is > fine but can't resolve some domains and sites. > > So want to come on bridge. > > As per my understanding bridge can not work while device is managed by > NetworkManager. > > Is there any utility or tool to use to scan wireless device in network and > connect them as i want to stop to use Networkmanager to use laptop wireless > interface as bridge for my guest vm. > > Thx > Ben > > > ------------------------------ > > Message: 3 > Date: Mon, 28 Jul 2014 10:08:24 +0200 > From: Alexander Dalloz <ad+lists(a)uni-x.org> > Subject: Re: [CentOS] wireless inteface configure as bridge > To: CentOS mailing list <centos(a)centos.org> > Message-ID: <53D604F8.9000209(a)uni-x.org> > Content-Type: text/plain; charset=windows-1252; format=flowed > > Am 28.07.2014 um 04:49 schrieb Benjamin Fernandis: > > Hi, > > > > I m using centos 7 in laptop and kvm as virtualization to run windows > guest > > vm.Currently i m using NAT as default setting for guest vm, my internet > is > > fine but can't resolve some domains and sites. > > > > So want to come on bridge. > > > > As per my understanding bridge can not work while device is managed by > > NetworkManager. > > How did you come to this conclusion? Based on which reading? > > > https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/ht… > > > Is there any utility or tool to use to scan wireless device in network > and > > connect them as i want to stop to use Networkmanager to use laptop > wireless > > interface as bridge for my guest vm. > > You cannot do what you want > > > https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/ht… > > "Note that a bridge cannot be established over Wi-Fi networks operating > in Ad-Hoc or Infrastructure modes. This is due to the IEEE 802.11 > standard that specifies the use of 3-address frames in Wi-Fi for the > efficient use of airtime." > > > Thx > > Ben > > Alexander > > > > ------------------------------ > > Message: 4 > Date: Mon, 28 Jul 2014 13:38:42 +0530 > From: Shital Sakhare <shital.sakhare1(a)gmail.com> > Subject: [CentOS] How to Stop the Image URL in apache > To: centos(a)centos.org > Message-ID: > < > CAN9YR_KXEkAuGr0yR_MEY9+yYOBvBG_DjyoZ-STNEzk5BQA_sw(a)mail.gmail.com> > Content-Type: text/plain; charset=UTF-8 > > Hi, > > While clicking on the image it opens into the browser. I dont want to allow > client to open the image in browser as separate url. I have blocked the > /image/ directory from access/listing , but the image is opening. > > ex. http://example.com/images/1.jpg . The image should not open in browser > with this URL. > > How to stop that in apache. Please help me. > > Shital S. > > > ------------------------------ > > Message: 5 > Date: Mon, 28 Jul 2014 17:33:37 +0900 > From: Kosuke Yagi <kosuke(a)wake.org> > Subject: [CentOS] How can I connect CentOS7 via xdmcp? > To: "centos(a)centos.org" <centos(a)centos.org> > Message-ID: <BE06C0BC-154F-4372-93CD-D58B48B42E6E(a)wake.org> > Content-Type: text/plain; charset=us-ascii > > Dear all, > > Does any one success to connect CentOS7 via xdmcp? > I've tried, but not yet succeeded. > > 1) CentOS7 with Development and Creative workstation > 2) Disabled SELinux by editing /etc/selinux/config > 3) Disabled firewalld by systemctl disable firewalld > 4) Enabled xdmcp by editing /etc/gdm/custom.conf > Adding "Enable=true" in [xdmcp] section > 5) reboot > 7) connect from windows7 PC with Xming-6.9.0.31 > "One window" mode with xdmcp connection > -> This is not working. > > How I can do next step? > > > Additional information, > I can open single Xterm window through Xming "Multiple windows" mode, > but I can't open gnome-terminal with same way. > > I guessed this means thomething wrong in gnome or gdm working witn > remote X or xdmcp. > But I have no idea to resolve it. > > Best regards, > Kosuke Yagi > > > ------------------------------ > > Message: 6 > Date: Mon, 28 Jul 2014 20:35:56 +1200 > From: Peter <peter(a)pajamian.dhs.org> > Subject: Re: [CentOS] How to Stop the Image URL in apache > To: CentOS mailing list <centos(a)centos.org> > Message-ID: <53D60B6C.4080201(a)pajamian.dhs.org> > Content-Type: text/plain; charset=ISO-8859-1 > > On 07/28/2014 08:08 PM, Shital Sakhare wrote: > > While clicking on the image it opens into the browser. I dont want to > allow > > client to open the image in browser as separate url. > > Not possible. There is nothing in the http protocol that differentiates > between a file being displayed inline inside other content and being > downloaded separately. All the webserver knows is that the file was > requested from the server and it delivers that file. > > There are tricks you can do with client-side javascript, or with > checking the referrer or user agent, etc. but all of them are easy to > circumvent, and note that regardless of what you do that file has to be > downloaded in order to be displayed in any capacity. > > > Peter > > > ------------------------------ > > Message: 7 > Date: Mon, 28 Jul 2014 14:29:00 +0530 > From: Gopu Krishnan <gopukrishnantec(a)gmail.com> > Subject: Re: [CentOS] How to Stop the Image URL in apache > To: CentOS mailing list <centos(a)centos.org> > Message-ID: > <CAHBH-Kv6oer42wD1GngNY=bx9_ccF1F+= > rqV1nY7B7t+BTRdPQ(a)mail.gmail.com> > Content-Type: text/plain; charset=UTF-8 > > Try the below : > > http://stackoverflow.com/questions/18524511/how-can-i-block-direct-access-t… > > > > On Mon, Jul 28, 2014 at 2:05 PM, Peter <peter(a)pajamian.dhs.org> wrote: > > > On 07/28/2014 08:08 PM, Shital Sakhare wrote: > > > While clicking on the image it opens into the browser. I dont want to > > allow > > > client to open the image in browser as separate url. > > > > Not possible. There is nothing in the http protocol that differentiates > > between a file being displayed inline inside other content and being > > downloaded separately. All the webserver knows is that the file was > > requested from the server and it delivers that file. > > > > There are tricks you can do with client-side javascript, or with > > checking the referrer or user agent, etc. but all of them are easy to > > circumvent, and note that regardless of what you do that file has to be > > downloaded in order to be displayed in any capacity. > > > > > > Peter > > _______________________________________________ > > CentOS mailing list > > CentOS(a)centos.org > > http://lists.centos.org/mailman/listinfo/centos > > > > > ------------------------------ > > Message: 8 > Date: Mon, 28 Jul 2014 14:33:10 +0530 > From: Shital Sakhare <shital.sakhare1(a)gmail.com> > Subject: Re: [CentOS] How to Stop the Image URL in apache > To: CentOS mailing list <centos(a)centos.org> > Message-ID: > < > CAN9YR_+byHKdMopxtqjb4oAzzocomHH-tz_EtiDfn5gwCY5Kfg(a)mail.gmail.com> > Content-Type: text/plain; charset=UTF-8 > > Thanks Peter, > > But I get it resolved. The setting is in Apache server itself. By adding > rewrite rule into apache or .htaccess. Below is the code and it worked. > > RewriteEngine On > Options -Indexes > RewriteBase / > RewriteCond %{HTTP_REFERER} !^%{HTTP_HOST}$ [NC] > RewriteRule \.(swf|gif|png|jpg|doc|xls|pdf|html|htm|xlsx|docx)$ [R,L] > > -- > Shital S > > > On Mon, Jul 28, 2014 at 2:05 PM, Peter <peter(a)pajamian.dhs.org> wrote: > > > On 07/28/2014 08:08 PM, Shital Sakhare wrote: > > > While clicking on the image it opens into the browser. I dont want to > > allow > > > client to open the image in browser as separate url. > > > > Not possible. There is nothing in the http protocol that differentiates > > between a file being displayed inline inside other content and being > > downloaded separately. All the webserver knows is that the file was > > requested from the server and it delivers that file. > > > > There are tricks you can do with client-side javascript, or with > > checking the referrer or user agent, etc. but all of them are easy to > > circumvent, and note that regardless of what you do that file has to be > > downloaded in order to be displayed in any capacity. > > > > > > Peter > > _______________________________________________ > > CentOS mailing list > > CentOS(a)centos.org > > http://lists.centos.org/mailman/listinfo/centos > > > > > ------------------------------ > > _______________________________________________ > CentOS mailing list > CentOS(a)centos.org > http://lists.centos.org/mailman/listinfo/centos > > > End of CentOS Digest, Vol 114, Issue 28 > *************************************** >

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Discuss July 2014