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Installing CentOS-7 but keeping CentOS-6.5
by Timothy Murphy 16 Jul '14

16 Jul '14

I'm having trouble installing CentOS-7 on my HP MicroServer. I've tried with KDE LiveCD and Netinstall (both on USB sticks), and now I'm going to try with the DVD ISO. But I want to be quite sure I can return to CentOS-6.5 if things go wrong, so I'm wondering what precisely I need to copy (eg the MBR and a bit more) so that I could get back to things as they were. Is this documented anywhere? Actually, both failed installations did give a boot menu including the old 6.5 system, but I'm afraid sometime this might not work, and I will be cut off from the world. Incidentally, the "Repair" option on the netinstall system was not as useful as I expected, or perhaps I don't know how to use it properly. It entered the new CentOS-7 system OK on chroot-ing, even mounting other partitions listed in /etc/fstab . And I was able to bring up the interfaces with "service network restart". But although I ran grub2-install , this did not help matters. Is there anything else one can do after chrooting into a system? Eg, can one boot the system in any way? Any advice or suggestions gratefully received. -- Timothy Murphy e-mail: gayleard /at/ eircom.net School of Mathematics, Trinity College, Dublin 2, Ireland

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CentOS-7 amavisd
by Timothy Murphy 16 Jul '14

16 Jul '14

Is anyone running amavisd and clamd under CentOS-7? Amavisd-new seems difficult to install, and clamd is difficult to find. (I've only added the epel repository, as I had a conflict when I added rpmforge as well.) I take it amavis is still the recommended way to run postfix? -- Timothy Murphy e-mail: gayleard /at/ eircom.net School of Mathematics, Trinity College, Dublin 2, Ireland

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Re: [CentOS] Cemtos 7 : Systemd alternatives ?
by James B. Byrne 16 Jul '14

16 Jul '14

On Tue, July 15, 2014 11:01, Les Mikesell wrote: > On Mon, Jul 14, 2014 at 11:50 PM, Keith Keller > <kkeller(a)wombat.san-francisco.ca.us> wrote: >>>> >>> 1. See the systemd myths web page >>> http://0pointer.de/blog/projects/the-biggest-myths.html >> >> In the interest of full disclosure, that page is written by one of the >> primary authors of systemd, so we shouldn't expect an unbiased opinion. >> (Not saying it's wrong, only that it's important to understand the >> perspective an author might have.) > > One thing that bothers me very much when reading that is the several > mentions of how you don't need to learn shell syntax as though that is > an advantage or as if the author didn't already know and use it > already. As if he didn't understand that _every command you type at > the command line_ is shell syntax. Or as if he thinks learning a > bunch of special-case language quirks is somehow better than one that > you can use in many other situations. When you get something that > fundamental wrong it is hard to take the rest seriously. > Without gainsaying any of the foregoing, let me put the alternative case. In my opinion, the era of dedicated sys-admins is passing if not already finished. A good friend of mine, sadly now deceased, began his career working for RCA adjusting colour television sets in the owner's homes. The neighbourhood garage with two or three teen-aged grease-monkeys and owner-mechanic are gone. So too are chauffeur-mechanics for car owners, elevator operators in buildings, attendants at public toilets (at least in North America), telephone-operators (mainly), and telephone booths (mostly). It is called the advance of the ages. All technology must, if it is to become truly useful, disappear from conscious consideration when operated. Consider how little user maintenance is even possible with a modern automobile, how pervasive the idea of instant world-wide voice and data communication is and the absurd triviality of the operating the technology necessary to accomplish this is (from the end user's perspective). How many here remember party-line telephone service? Operator assisted Station-to-Station and Person-to-Person long distance calls? Telegrams? Telex? Centrex? Analysis pads? Residual artifacts of all these things are still to be found but their function has been subsumed and submerged by technology and the skills necessary to operate them are obsolete. All successful automation is going down the same path. The *nixes have not won the OS wars but they are, I believe, a significant part of the medium term future of automation. However, to become truly useful to the widest possible audience the arcane user interface commonly encountered in the myriad of disjointed *nix system utilities has to be radically simplified to the point of triviality. A shell is, at its root, a programming language. A peculiar form of virtual machine if you will. The vast majority of computer users are not programmers and will never become so. What this means is that the shell, of whatever ilk, must be submerged to the view of most users if *nix is to thrive. For the cognoscenti this will ever be a point of discomfort for it puts into question the value of their hard won skills. Nonetheless, things like systemd, gnome3, and no-doubt dumber and more awful things to come are, in my opinion, inevitable. Computing is just too valuable a resource to be left solely in the hands of a self-selected elite whose entrance requirement is mastery of a dozen subtly different ways of telling computer systems to do essentially the same thing. There is a reason that things like Webmin already exist and it is not because of MS-Windows or LUsers. It is because the native administrative interface to the standard *nix system is a nightmare of complexity, inconsistency and sheer bloody-mindedness. At least, that is how I see it. I am not comfortable with change but I have long ago given up trying to resist it. If systemd presents a common DSL for service management dependencies __AND__ it works then bring it on. I had to write upstart Stanzas for IAXModem on C6. I suppose it will not be any harder in its successor on C7. -- *** 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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Re: [CentOS] pstack
by Joerg Schilling 16 Jul '14

16 Jul '14

Reindl Harald <h.reindl(a)thelounge.net> wrote: > > pstack is a Solaris command from the p-tools group. It works nicely even when > > the binary is stripped. You cannot replace it by something as limited as gdb > > that needs a binary compiled with -g in order to print a useful stacktrace > > with function parameters > > blabla - keep your Solaris advertisments for you It seems that you are better located in a closed source list, please stay away if you have no useful statements. Jörg -- EMail:joerg@schily.net (home) Jörg Schilling D-13353 Berlin joerg.schilling(a)fokus.fraunhofer.de (work) Blog: http://schily.blogspot.com/ URL: http://cdrecord.org/private/ http://sourceforge.net/projects/schilytools/files/'

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CentOS7: vncserver - desktop resolution
by Martin Moravcik 16 Jul '14

16 Jul '14

Hi, I just installed CentOS7 and managed to start the vncserver service, but once I connect to the machine, the desktop resolution isn't the one which I set in the vncserver@:3.service file located in /lib/systemd/system/ directory. The content of the mention file: ---------------------------------------- [Unit] Description=Remote desktop service (VNC) After=syslog.target network.target [Service] Type=forking # Clean any existing files in /tmp/.X11-unix environment ExecStartPre=/bin/sh -c '/usr/bin/vncserver -kill %i > /dev/null 2>&1 || :' ExecStart=/sbin/runuser -l foo -c "/usr/bin/vncserver %i -geometry 1400x800 -nolisten tcp -localhost" PIDFile=/home/foo/.vnc/%H%i.pid ExecStop=/bin/sh -c '/usr/bin/vncserver -kill %i > /dev/null 2>&1 || :' [Install] WantedBy=multi-user.target ------------------------------------------ The desktop resolution is different (more than my NB display can display) and the scroll bars appear. The same behaviour occurs when I start the vncserver from commant line: vncserver :4 -geometry 1400x800 -nolisten tcp -localhost and then connect via ssh vncconfig -display :4 -connect localhost:49999 In CentOS6 I had no problem with this. The desktop resolution adjusted according the -geometry parameter. Please, let me know, if you have any idea. thanks martin

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Troubleshooting suspend/resume problem in Centos 7
by Emmanuel Noobadmin 16 Jul '14

16 Jul '14

I'm trying out CentOS 7 using a HP AMD laptop http://h10025.www1.hp.com/ewfrf/wc/document?cc=uk&lc=en&docname=c03877039 The problem is the laptop doesn't suspend properly in runlevel 5 / graphical.target and following guides, I found that it suspends (power LED blinking) but does not resume in runlevel 3 / multi-user.target. When it locks up, the machine is unresponsive to ping/ssh so it's not just a blank screen. Unfortunately, the only applicable guide I found on troubleshooting this is for Ubuntu, which requires the kernel to support pm_trace which isn't found in /sys/power. Since there is a big red warning on centos.org about building/compiling my own kernel to add functions, I'm wondering if there are any alternative method to troubleshoot the issue on CentOS. I suspect it may be related to the Radeon GPU as I notice that every now and then after fresh boot, the GUI desktop will freeze for a while and dmesg will contain errors: [drm:cik_ib_test] *ERROR* radeon: fence wait failed (-35) [drm:radeon_ib_ring_tests] *ERROR* radeon: failed testing IB on ring 2 (-35) As a side note, this laptop had no problems with suspend/resume when it was running Ubuntu 14.04

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pstack
by Clovis Tristao 16 Jul '14

16 Jul '14

Hi, How to install pstack in CentOS 6.5? Which repository or package it is part? Thanks a lot, Clóvis -- Clovis Tristao - UNICAMP/Faculdade de Engenharia Agricola Administrador de Redes - Secao de Informatica (SINFO) E-mail: clovis(a)feagri.unicamp.br http://www.feagri.unicamp.br MSN: clovis_tristao33(a)hotmail.com Fone: 55(19) 35211021-35211031-35211038-91173116

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Opera is slow on CentOS
by Gergely Buday 16 Jul '14

16 Jul '14

Hi there, I am running various browsers on my CentOS 6.5. Firefox is running smoothly, especially with blocking flash animations. I recently installed Opera and I use Seamonkey for long, both suffers from being very slow. Does CentOS have any role in this? For your information I send cpuinfo, some people on #centos said that this could be the problem -- but then why Firefox flies? - Gergely $ cat /proc/cpuinfo processor : 0 vendor_id : AuthenticAMD cpu family : 15 model : 95 model name : AMD Athlon(tm) 64 Processor 3000+ stepping : 2 cpu MHz : 1808.292 cache size : 512 KB fpu : yes fpu_exception : yes cpuid level : 1 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 syscall nx mmxext fxsr_opt rdtscp lm 3dnowext 3dnow up rep_good extd_apicid pni cx16 lahf_lm svm extapic cr8_legacy bogomips : 3616.58 TLB size : 1024 4K pages clflush size : 64 cache_alignment : 64 address sizes : 40 bits physical, 48 bits virtual power management: ts fid vid ttp tm stc

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Still X problems
by mark 16 Jul '14

16 Jul '14

As I posted yesterday, 6.5, a new Dell with a Quadro k2000. I installed kmod-nvidia, and startx works fine... but runlevel 5 fails. Any suggestions? mark

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Cento 7: Color is not known to server (FOREGROUND) [No such file or directory].
by Frank Cox 16 Jul '14

16 Jul '14

I have installed both ImageMagick and GraphicsMagick on this computer. Using the "display" command (from ImageMagick) to show any image gets me this message: display: color is not known to server `FOREGROUND': No such file or directory @ error/xwindow.c/XGetPixelPacket/3064. No image shows up. Using the "gm display" command (from GraphicsMagick) to show any image gets me this message: gm display: Unable to load font (-*-helvetica-medium-r-normal--12-*-*-*-*-*-iso8859-1) [Resource temporarily unavailable]. gm display: Color is not known to server (FOREGROUND) [No such file or directory]. gm display: Color is not known to server (BACKGROUND) [No such file or directory]. In this case, the image does appear. What does "Color is not known to server" actually mean? -- MELVILLE THEATRE ~ Real D 3D Digital Cinema ~ www.melvilletheatre.com

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