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34758 discussions

Which Videoconference System
by Joe 01 May '18

01 May '18

Hello, i m looking for a webrowser-based video conference/meeting server running on centos 7. I found jitsi, bigbluebutton, Apache OpenMeetings and more. But none has a (good) tutorial for installing on centos. You have a tip for me for a project or good tutorials? thx. joe

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elrepo kmod-nvidia issue with update
by Chuck Campbell 01 May '18

01 May '18

when I do yum update, elrepo offers kmod-nvifdia, but yum does this: --> Processing Dependency: kernel(sme_me_mask) = 0x17fbce60 for package: kmod-nvidia-390.48-2.el7_5.elrepo.x86_64 --> Processing Dependency: kernel(reservation_object_add_excl_fence) = 0xea98efc0 for package: kmod-nvidia-390.48-2.el7_5.elrepo.x86_64 --> Processing Dependency: kernel(drm_vblank_init) = 0xdcd50a49 for package: kmod-nvidia-390.48-2.el7_5.elrepo.x86_64 . . . repeatedly, then says: You could try using --skip-broken to work around the problem You could try running: rpm -Va --nofiles --nodigest Is there a problem on my end or theirs? -chuck -- ACCEL Services, Inc.| Specialists in Gravity, Magnetics | (713)993-0671 ph. | and Integrated Interpretation | (713)993-0608 fax 448 W. 19th St. #325| Since 1992 | (713)306-5794 cell Houston, TX, 77008 | Chuck Campbell | campbell(a)accelinc.com | President & Senior Geoscientist | "Integration means more than having all the maps at the same scale!"

4 3

Named log question
by Chuck Campbell 30 Apr '18

30 Apr '18

Is this mis-configuration, or just noise in my log? 29-Apr-2018 00:50:26.056 general: warning: managed-keys-zone: No DNSKEY RRSIGs found for '.': success: 1 Time(s) 29-Apr-2018 00:50:26.120 general: warning: managed-keys-zone: No DNSKEY RRSIGs found for 'dlv.isc.org': success: 1 Time(s) -chuck -- ACCEL Services, Inc.| Specialists in Gravity, Magnetics | (713)993-0671 ph. | and Integrated Interpretation | (713)993-0608 fax 448 W. 19th St. #325| Since 1992 | (713)306-5794 cell Houston, TX, 77008 | Chuck Campbell | campbell(a)accelinc.com | President & Senior Geoscientist | "Integration means more than having all the maps at the same scale!"

1 0

Network Performance
by Chris Olson 30 Apr '18

30 Apr '18

One of our summer interns has stayed on working part time on weekends during the school year. This schedule presents an opportunity for technical investigations and some needed performance testing. The last weekend assignment included data rate testing on one specific network pathway. Checking out previous network testing was the first assignment. Some five year old, archived SPARC/Solaris and Intel/Solaris network tests included ftp runs like the following: ftp> ftp> put "|dd if=/dev/zero bs=32768 count=8000" /dev/null 200 PORT command successful. 150 Binary data connection for /dev/null (IP Address). 8000+0 records in 8000+0 records out 226 Transfer complete. local: |dd if=/dev/zero bs=32768 count=8000 remote: /dev/null 262144000 bytes sent in 23 seconds (11081.79 Kbytes/s) ftp> There were dozens of examples of such ftp tests with varying block sizes, bidirectional transfers, destination files on RAID storage, and a mix of some system loading programs run independently and during the network performance testing. Also archived were a full complement of network tests with what looks like the original ttcp and possibly newer versions. These utilities looked like they would work on our CentOS 6 systems, but we did not find ttcp and the ftp tests failed. the piping from dd failed with a message indicating that: |dd was not a recognized file. We no longer have available CentOS systems with versions of the OS before CentOS 6. Could there have been a change to ftp that will not allow a source file specified in this way or would this transfer method have never worked on Linux?

3 2

How do I get the kernel srpm?
by Robert Heller 30 Apr '18

30 Apr '18

I tried to follow the work flow shown in https://wiki.centos.org/Sources, but it does not seem to work: I did this: mkdir CentOS pushd CentOS git clone https://git.centos.org/git/centos-git-common.git git clone https://git.centos.org/git/rpms/kernel.git pushd kernel/ git checkout c6 ../centos-git-common/get_sources.sh And I got the message: Missing metadata. Please run from inside a sources git repo What am I missing? -- Robert Heller -- 978-544-6933 Deepwoods Software -- Custom Software Services http://www.deepsoft.com/ -- Linux Administration Services heller(a)deepsoft.com -- Webhosting Services

4 3

OT: thunderbird annoyance
by m.roth＠5-cent.us 30 Apr '18

30 Apr '18

Does anyone know if it's even possible to NOT cc myself when I hit reply all? Geez, that's what's in the sent folder.... mark

4 6

formating DVR-RW
by Michael Hennebry 29 Apr '18

29 Apr '18

My Centos 6 wodim tell me that it can only format DVD+RW. I have DVD-RWs. Even when I format a DVD-RW on my standalone DVD recorder, wodim still will not write to it. Is there a centos-6-useable mechanism for formatting and writing DVD-RWs? -- Michael hennebry(a)web.cs.ndsu.NoDak.edu "Sorry but your password must contain an uppercase letter, a number, a haiku, a gang sign, a heiroglyph, and the blood of a virgin." -- someeecards

10 13

Need help: I219-v driver issue in centos 7 installation
by dibyendukoley1 28 Apr '18

28 Apr '18

Sir, Can any one please help me to install I219-V driver. The driver that is provided by intel that is for freebsd only. I have tried of installing e1000e driver but no luck.... Please help.... Looking forward to you.

2 4

CentOS events for 2018/2019
by Rich Bowen 27 Apr '18

27 Apr '18

TL;DR: What events should we go to? Tell me at https://goo.gl/forms/kLZ2y1H1jRSy4NdC3 (Cross-posting from promo@ mailing list, to get a wider participation. Thanks!) Looking at the coming 12 months, I need some feedback as I select events that need to have a CentOS presence of some kind. While I have already committed to some of these events (See below), starting around July we haven't really signed on for much, and I would like to hear from the community what events you feel we should be at, and why. The why is, by far, the more important half of the question. Why, as in, what story do we want to tell there; who are we trying to tell that story to; what would be a positive outcome from being there. First, here are the events that I am already committed to: May 8-10: Red Hat Summit - https://www.redhat.com/en/summit/2018 June 25-28: ISC-HPC (SuperComputing) Frankfurt - https://www.isc-hpc.com/ October 1-3: cPanel, Houston - https://conference.cpanel.com/ November 12-15: SuperComputing 18, Dallas - https://sc18.supercomputing.org/ February 2-3 (assumed): FOSDEM, Brussels - http://fosdem.org The story at Red Hat Summit is that CentOS (and, specifically, our SIGs) is the platform for innovation, and the source of all of Red Hat's products, as well as projects and products that continue to invent the industry. The story at the SuperComputing events is what I have been tweeting "SuperComputing is #PoweredByCentOS" - which is incontrovertibly true. The top 500 supercomputers in the world are overwhelmingly CentOS. We attend cPanel because the web hosting business, and in particular cPanel-backed sites, are overwhelmingly running on CentOS. FOSDEM - because it's FOSDEM. Events where we could have a presence are, of course, legion. We can continue to do the events that we did last year, and the year before, and that would be fine. Or we can try to visit some other industry segment where we'd like to shine brighter. I've made a Google Form at https://goo.gl/forms/kLZ2y1H1jRSy4NdC3 listing the events that I'm currently considering, but also providing space for you to tell me what events I'm not thinking about yet. Finally, please note that I'm not just talking about me going to stuff, but, rather, identifying the right people that should be at these events, and sending them to represent us - CentOS Ambassadors, if you will. -- Rich Bowen - rbowen(a)redhat.com @RDOcommunity // @CentOSProject // @rbowen

1 0

Re: [CentOS] formating DVR-RW
by Thomas Schmitt 27 Apr '18

27 Apr '18

Hi, i am upstream developer of libburn. Nevertheless, the following is intended to be purely technical info, not advertising. Better do not use wodim with DVD media. It was forked from a CD-only version of cdrecord and got added not-so-skilled code for operating DVD. One should use dvd+rw-tools or a program that has libburn as backend. I am not aware whether cdrecord is meanwhile willing to format DVD-RW. With dvd+rw-tools and according to an old cheat sheet of mine, a DVD-RW gets formatted like this: dvd+rw-format -force /dev/sr0 (Iirc, the option -force was needed if there is already an ISO filesystem on the medium.) libburn's frontend cdrskin has a command line interface that is roughly compatible to wodim or cdrecord. (There are also Xfburn, xorriso, and Brasero's libburn plugin.) A formatting run looks like this: cdrskin -v dev=/dev/sr0 blank=format_overwrite Fred Smith wrote: > Why would one format a cd/dvd? DVD-RW can have two states: unformatted sequential and formatted to "restricted" overwritable. The latter can take 32 KiB chunks of write data at 32 KiB-aligned addresses. It does not have to be blanked before re-use. growisofs and libisoburn can do multi-session on it, like they do with DVD+RW, DVD-RAM, BD-RE. Unformatted DVD-RW behave much like DVD-R (which is good for testing). Blanking them for re-use is only swift if you do not want to do multi-session on the blank medium. For multi-session they must be blanked fully, which lasts as long as a full write run. My own experince since 2004 is that formatted DVD-RW can be re-used more often before they die. Unformatted DVD-RW seem to be less long living. The older the drive, the earlier they fail. Giles Coochey wrote: > In order to delete something that you had previously written to it? Formatted DVD-RW can be used as random access read-write device by help of buffering device /dev/pktcdvd* created by pktsetup(1). But this is an invitation for trouble, as is with the other overwritable optical media types. Random access is slow and the frequent overwriting of particular media blocks reduces life time. (The other overwritable DVD and BD types need no /dev/pktcdvd* because they can be used for addressing with 2 KiB granularity.) Nataraj wrote: > I suggest that you try xorriso. Thank you for flying xorriso. :)) It has a cdrecord-wodim-compatibility mode described in man 1 xorrecord. Formatting is done by: xorrecord -v dev=/dev/sr0 blank=format_overwrite The native command mode is more versatile but demands learning new names and new rules. See man 1 xorriso. xorriso -outdev /dev/sr0 -format as_needed The mode "as_needed" formats what can be formatted and is not formatted yet. It throws no error if the medium is not suitable for formatting. Have a nice day :) Thomas

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