Discuss June 2018

discuss@lists.centos.org

93 participants
84 discussions

Convert from LVM
by Matt 09 Jun '18

09 Jun '18

I have a Centos 7 install using EXT4 on LVM. Its running as a VM inside KVM. Issue I have run into is that fstrim does not work due to the LVM. Without fstrim snapshots have gotten huge. Is there a way convert it from LVM to non-LVM without a complete reinstall?

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A touch conused on context
by m.roth＠5-cent.us 08 Jun '18

08 Jun '18

Ok, we've got a set of directories bind mounted on our standard mount point for the web. The directory tree's been set with semanage fcontext -t -e /var/www <ourmountpoint>. In one of the websites under there is <site>/cgi-bin, and under *there are a couple of subdirectories, and a .dat file that is written to (I thihnk it's a counter, or whatever). Yet I see sealerts complaining that, if it was in enforcing mode, would not allow the .cgi that's in the cgi-bin write access on the file. What am I missing here? mark

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git public web frontends
by Alice Wonder 08 Jun '18

08 Jun '18

Hello, Set up a CentOS 7.5 VM linode for git now that github has been bought. I'm not anti-microsoft but I'm worried they will make changes that I don't like (e.g. requiring ms account, changing billing, etc.) so I figured better take control now. Currently moving my private repos and have them set up in my home directory there, but my public repos - I want to set them up with a web interface so people can browse them etc. and do a git clone w/o needing authentication. I'll be putting those in /srv/git and using a different username than the account for my private git repositories. But... can anyone recommend a web front end? It doesn't need to be as fancy as github but it does need to parse markdown as all my documentation is in markdown. Thanks for suggestions. Preferably something that "just works" with CentOS 7. -=- What would be fantastic is if someone made some kind of federation type service similar to how Mastodon works that lets public git repositories that opt in be found without needing to be on a centralized server. But I doubt that currently exists.

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can you rpm rebuild R-core-3.5.0-1.el7.x86_64 from epel-testing..
by lejeczek 07 Jun '18

07 Jun '18

..successfully? many thanks, L.

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Slightly OT : write bootable CentOS USB disk under Windows 10 and Mac OS X ?
by Nicolas Kovacs 07 Jun '18

07 Jun '18

Hi, I'm currently writing my fourth book about Linux, for the french editor Eyrolles. The book will cover Linux server basics for pros, and it will be based on CentOS 7. I have a quick question to those of you who use either Windows 10 or Mac OS X as their everyday desktop system. How do you write a bootable CentOS USB disk using either Windows 10 or Mac OS X ? I've googled this, of course, and there's quite a lot of possible solutions out there, so I'm curious about a more or less *orthodox* way of doing things. Me, I've been 100 % GNU/Linux since 2001, CentOS is running on my workstation and on my laptop, and I'm simply writing the ISO file to a USB stick using dd if=CentOS-XXXX.iso of=/dev/sdX. Thanks & cheers, Niki -- Microlinux - Solutions informatiques durables 7, place de l'église - 30730 Montpezat Site : https://www.microlinux.fr Blog : https://blog.microlinux.fr Mail : info(a)microlinux.fr Tél. : 04 66 63 10 32

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Distributed System Monitoring
by Chris Olson 07 Jun '18

07 Jun '18

We have recently been assigned to help with the development of a system that will power non-computer/non-network devices located at various places within a 10,000 square ft facility. Most of these devices will operate on a fairly wide range of DC input power. The availability of surplus Cat-5 cable and the availability of low cost POE switches has been suggested as a method of powering these devices. There also appears to be some good, low cost installation options for all of the required system elements. The activity and health of the devices is directly related to their power consumption. Is there a standard CentOS feature or commonly used App that would facilitate monitoring the power being supplied by each of the individual POE switch outputs? Thanks in advance for any information shared.

2 1

ldd question on CentOS 6.8 (64bit)
by ejm 07 Jun '18

07 Jun '18

Hi all, Will ldd display the paths to different libraries depending on their locations? I'm trying to build libxml2 version 2.9.6 in /usr/local with a newer version of zlib (1.2.8) than what are in the system folders for CentOS 6.8. I get the following output from ldd: $ ldd ./libxml2.so ./libxml2.so: /lib64/libz.so.1: version `ZLIB_1.2.3.3' not found (required by ./libxml2.so) linux-vdso.so.1 => (0x00007ffeb1789000) libdl.so.2 => /lib64/libdl.so.2 (0x00007fce9e824000) libz.so.1 => /lib64/libz.so.1 (0x00007fce9e60e000) <-- I expected /usr/local/lib here libm.so.6 => /lib64/libm.so.6 (0x00007fce9e389000) libc.so.6 => /lib64/libc.so.6 (0x00007fce9dff5000) /lib64/ld-linux-x86-64.so.2 (0x0000003d52a00000) Yet the make itself for libxml2 seemed to exit without error. >From otool on Mac OSX (same installation of libxml2/zlib) I see: %otool -L libxml2.2.dylib libxml2.2.dylib: /usr/local/lib/libxml2.2.dylib (compatibility version 12.0.0, current version 12.6.0) /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 88.1.12) /usr/local/lib/libz.1.dylib (compatibility version 1.0.0, current version 1.2.8) /usr/local/lib/libiconv.2.dylib (compatibility version 9.0.0, current version 9.0.0) /usr/local/lib/libgcc_s.1.dylib (compatibility version 1.0.0, current version 1.0.0) libxml2, libz and libiconv were all installed in /usr/local so as not to over-write the OS versions. Will ldd show similar correct paths for component libraries as otool does? I'm trying to track down if there is an error in the Makefile target for the link phase of the library. Thanks, --Ed

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Re: [CentOS] Firefox and Thunderbird freeze/crash followed by "nfs4_reclaim_open_state: Lock reclaim failed!" syslog messages
by Frank Thommen 07 Jun '18

07 Jun '18

I was afraid someone would say that :-). I am currently at 3.10.0-862.3.2 and downgrading to a 3.10.0-6xx kernel breaks some of the other packages. Is the mentioned bug documented somewhere? Cheers frank On 07/06/18 06:22, James Peltier wrote: > There was a kernel bug that affected all NFSv4 traffic that we ran into > and we had to downgrade the kernel to and older version > (3.10.0-693.2.2.el7.x86_64) which seemed to help with our NFSv4 issues. > We have not upgraded to a newer kernel to see if the issue has been > resolved. > > > > ------------------------------------------------------------------------ > *From:* CentOS <centos-bounces(a)centos.org> on behalf of James Pearson > <james-p(a)moving-picture.com> > *Sent:* June 6, 2018 2:49 PM > *To:* CentOS mailing list; Frank Thommen > *Subject:* Re: [CentOS] Firefox and Thunderbird freeze/crash followed by > "nfs4_reclaim_open_state: Lock reclaim failed!" syslog messages > Frank Thommen wrote: >> >> Hi, >> >> since I updated my workstation from CentOS 7.4 to 7.5, Firefox and >> Thunderbird (both 52.8.0, from CentOS repos) regularly freeze (or crash) >> and cannot be restarted afterwards.? Trying to start them results in a >> "Bus error (core dumped)" (Firefox) and "Killed" (Thunderbird).? The >> system log then shows: >> >>? ???? kernel: NFS: nfs4_reclaim_open_state: Lock reclaim failed! >> >> each time I try to start the applications (our homedirectories are >> mounted via NFS4).? As far as I can see, no other applications are >> affected.? The workstation needs to be rebooted to fix the situation. >> >> Has anyone else seen that or knows how to debug or fix this issue? I >> tried with strace and wireshark w/o finding anything helpful. > > I'm not sure what the el7 default for the Firefox > 'storage.nfs_filesystem' pref is - but you could try setting it to > 'true' to see if that makes a difference ? > > James Pearson > _______________________________________________ > CentOS mailing list > CentOS(a)centos.org > https://lists.centos.org/mailman/listinfo/centos

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Firefox and Thunderbird freeze/crash followed by "nfs4_reclaim_open_state: Lock reclaim failed!" syslog messages
by Frank Thommen 07 Jun '18

07 Jun '18

Hi, since I updated my workstation from CentOS 7.4 to 7.5, Firefox and Thunderbird (both 52.8.0, from CentOS repos) regularly freeze (or crash) and cannot be restarted afterwards. Trying to start them results in a "Bus error (core dumped)" (Firefox) and "Killed" (Thunderbird). The system log then shows: kernel: NFS: nfs4_reclaim_open_state: Lock reclaim failed! each time I try to start the applications (our homedirectories are mounted via NFS4). As far as I can see, no other applications are affected. The workstation needs to be rebooted to fix the situation. Has anyone else seen that or knows how to debug or fix this issue? I tried with strace and wireshark w/o finding anything helpful. Cheers frank

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Docker Update 1.13.1-53 -> 1.13.1-63 certificate error
by Hans-Joachim Hetscher 07 Jun '18

07 Jun '18

Hello, I'm using the docker stuff from the extras repo on CentOS 7.x I'm using a secured local registry, which worked fine til 1.13.1-53 After the upgrade, I run into following error: > docker login repo.local:5000 Error response from daemon: Get https://repo.local:5000/v1/users/: x509: certificate is not valid for any names, but wanted to match repo.local > curl -v https://repo.local:5000/v1/users/ * About to connect() to repo.local port 5000 (#0) * Trying 1xx.xx.x.xx... * Connected to repo.local (1xx.xx.x.xx) port 5000 (#0) * Initializing NSS with certpath: sql:/etc/pki/nssdb * CAfile: /etc/pki/tls/certs/ca-bundle.crt CApath: none * SSL connection using TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 * Server certificate: * subject: CN=repo.local,OU=OU,O=Enterprise,L=City,ST=Country,C=DE * start date: Okt 09 14:31:40 2017 GMT * expire date: Aug 18 14:31:40 2027 GMT * common name: repo.local * issuer: CN=ROOTCA für xxx,OU=OU,O=Enterprise,L=City,ST=Contry,C=DE > GET /v1/users/ HTTP/1.1 > User-Agent: curl/7.29.0 > Host: repo.local:5000 > Accept: */* > < HTTP/1.1 404 Not Found < Content-Type: text/plain; charset=utf-8 < Docker-Distribution-Api-Version: registry/2.0 < X-Content-Type-Options: nosniff < Date: Thu, 07 Jun 2018 08:49:35 GMT < Content-Length: 19 < 404 page not found * Connection #0 to host bbgpvmdocker0.bbg.michelin.com left intact After downgrading to 1.13.1-53, all works again as expected. Any hints to solve this issue? Hans-Joachim

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Discuss June 2018