Discuss April 2015

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168 participants
185 discussions

LUKS encypted partition using --key-file can only be decrypted with --key-file
by Digimer 15 Sep '15

15 Sep '15

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi all, I created a LUKS encrypted partition via a udev-triggered script on 6.6 using --key-file /tmp/foo. This worked fine, and I can decrypt the LUKS partition via script and manually using --key-file with luksOpen. The odd problem is that I can't decrypt the partition using the prompt. If I manually create a file with the passphrase in it and then point to it with --key-file, it decrypts fine. I used 'cat -A /tmp/foo' to verify that there was no '\n' at the end of the phrase. Is this expected behaviour? That is; If you create an encrypted partition using --key-file, you always decrypt with the same? If so, I can't understand the logic... If not, then I am not sure what I am doing wrong. Thanks for any insight! digimer - -- Digimer Papers and Projects: https://alteeve.ca/w/ What if the cure for cancer is trapped in the mind of a person without access to education? -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAEBAgAGBQJU93ZLAAoJECChztQA3mh0swwP/2PX3Y3TmEEIeN7WxWQjnbX0 B+hdp3Yk1PBqaQ/FsOzGsnKnxOUu73fB25gDksEWnNedBru4ayJuYPW644rH8Ivr fS8Pz3y6buGqUaggzsGNaGfDOKtiLOp722OeuPUmaNHnGCE3qJbhE3RKBRrMl4SP Yi/otL8+85cp4isMESOYs3F5qw/osDmmKxktPbULbTrne94EWHHl+9RoSFDZFNCj JBsNE122WUtn+2JPV8it8nlIS/Kzqzv3qGR88lYiBj3y3F+zIbpix/8wyCgRVSw6 /LQwLSTmGKYdvLw2Td7oIqMrW69ZsgujAonnbyx2nl9WN3KSqr799SxL4n2M7ZOj a1MjcLdLr0kM28eu+/A3LyHQRkBVsz7f27e7M+drEVa4OHFS3KuL4EM47xkTGyps veljkNmZ8elL7PX+dmWsVGYyo4XH/bTFDcW8ZLhr+bc55xLplMRrhPNNFGQ+5k3R ev7HRhSqHD9Ub39KTea4WCJOsm0hJJgKYneWYmQJ1aVYmrFMHLJaJBzCqU+W751O GkXvU24eoajNKnIAcY9wrC/WzVru8dM2JwBefcatxCsWFhpcpSyrh0zhCAiZKOga hjskIq/54Il8YyzSVy5Xvwv8WACBUwoiPv6ZqVm3oKRkoZI3E14vVYTcG+b0cPqn S30qAHntsjFA70Hpedt5 =YYFB -----END PGP SIGNATURE-----

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SAMBA as AD DC
by Sergio Belkin 11 Sep '15

11 Sep '15

Hi folks, Is able SAMBA on CentOS 7 to work as Active Directory Domain Controller? If it's not, what is the recommended way of doing? Compiling from sources? Install packages from SerNet? Thanks in advance! -- -- Sergio Belkin http://www.sergiobelkin.com LPIC-2 Certified - http://www.lpi.org

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How to setup own i686 buildenv for CentOS7
by Robin Lee 07 Sep '15

07 Sep '15

Hi, all! How to setup own i686 mock for CentOS7? Or, is there any public i686 repo for CentOS7? I found i686 repo available in internal CentOS building environment, from a root.log from a mock build result[1]. [1] http://buildlogs.centos.org/c7-updates/glibc/20141218212615/2.17-55.el7_0.3… Cheers, -robin

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whois command in c6
by John R Pierce 09 Aug '15

09 Aug '15

the whois command in c6 references whois.v6nic.net for ip addresses in the 43.0.0.0/8 range (and maybe others). v6nic is no longer a valid whois server, any nets delegated to it should instead be delegated to apnic. i have no upstream connections... this change was made in the generic sources for jwhois some time ago I see this fix was introduced in F20 here, https://bugzilla.redhat.com/show_bug.cgi?id=1121512 -- john r pierce, recycling bits in santa cruz

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Mail Merge data to a pdf file by overlaying the data on the image
by Gregory P. Ennis 07 Jun '15

07 Jun '15

Everyone, I am looking for a utility that I can use to do a mail merge of data to a pdf image file. The image file does not have any active fields, but will be just an image file. I would like to overlay names addresses etc. We currently do this with a pcl file by just overlaying the data with pcl print positions. However, in order to get the pcl file from an original pdf file we have to use gimp to convert the pdf to pcl file, and we always lose a little resolution. I was wondering if anyone knows of a utility to perform this function without first converting the image to a pcl file. Thanks, -- Greg Ennis

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Openssl C6 distro tag different from upstream
by Leonard den Ottolander 28 May '15

28 May '15

Hi, Just noticed that the distro tag used in openssl is different from upstream. Upstream and the last update (openssl-1.0.1e-30.el6_6.7) use "el6_6" where as the latest update (openssl-1.0.1e-30.el6.8) uses "el_6". Any reason for this discrepancy? Regards, Leonard. -- mount -t life -o ro /dev/dna /genetic/research

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Cannot remount drive after lost iSCSI connection
by Kyle Thorne 07 May '15

07 May '15

Hi all, We've having an issue at the moment where an iSCSI connection was temporarily lost on a few VMs running CentOS 6 on ESXi. The problem is, now that the iSCSI connection has returned, we are not able to remount the drive. At first the drive is read-only, so I tried '*mount -o remount,rw*' which didn't work (still read-only), so then I tried a '*umount*' (which worked), but now I get the following error when trying to mount it again: root@server [~]# mount /backup/ mount: /dev/sdb1 already mounted or /backup busy root@server [~]# mount /dev/sdb1 mount: /dev/sdb1 already mounted or /backup busy I have also tried '*echo "- - -" > /sys/class/scsi_host/host1/scan*' and checked to see if any processes were using /dev/sdb1 or /backup using ' *fuser*' and '*lsof*'. I know a reboot will solve it, but I'm trying to avoid that as best I can, so I'm wondering if anyone else has any other ideas? Any help would be greatly appreciated, thanks. :) Regards, Kyle Thorne -- *The contents of this email are strictly private and confidential unless otherwise noted and is intended for the marked recipients only. If you are not a marked recipient please disregard and delete this email.*

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Signed repomd.xml.asc files for CentOS-6 and CentOS-7 (testing)
by Johnny Hughes 06 May '15

06 May '15

For those of you not currently on the centos-devel mailing list, we are looking to test signed repomd.xml files (repomd.xml.asc) for CentOS-6 and CentOS-7. If you are interested in signed metadata repos, please look at this post: http://lists.centos.org/pipermail/centos-devel/2015-April/013210.html Also, if you are willing to test / help with the solution for signed metadata, please join the centos-devel mailing list and correspond there: http://lists.centos.org/mailman/listinfo/centos-devel Thanks, Johnny Hughes

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Mysql 5.6, Centos 7 and errno: 24 - Too many open files
by Götz Reinicke - IT Koordinator 05 May '15

05 May '15

Hi, may be somewon has a working solution and information on that: I installed the most recent mysql community on a server and do get a lot of "errno: 24 - Too many open files". There are suggestions to increase the open_files_limit, change/add that to /etc/security/limits.conf and modify the systemd script by hand. Depending on how you start mysql (restart, or at systemboot time ...) the limit get set or not. Question: Is that may be a known bug or something? And thats mit a question regarding mariadb or mysql. Regards . Götz -- Götz Reinicke IT-Koordinator Tel. +49 7141 969 82 420 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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Re: [CentOS] nfs (or tcp or scheduler) changes between centos 5 and 6?
by Peter van Hooft 04 May '15

04 May '15

> Message: 4 > Date: Wed, 29 Apr 2015 08:35:29 -0500 > From: Matt Garman <matthew.garman(a)gmail.com> > To: CentOS mailing list <centos(a)centos.org> > Subject: [CentOS] nfs (or tcp or scheduler) changes between centos 5 > and 6? > Message-ID: > <CAJvUf-CyTg8ZiGq3OXRLKw7s1K2dGx1gqo_2XwOAXXQty=RHZQ(a)mail.gmail.com> > Content-Type: text/plain; charset=UTF-8 > > We have a "compute cluster" of about 100 machines that do a read-only > NFS mount to a big NAS filer (a NetApp FAS6280). The jobs running on > these boxes are analysis/simulation jobs that constantly read data off > the NAS. > > We recently upgraded all these machines from CentOS 5.7 to CentOS 6.5. > We did a "piecemeal" upgrade, usually upgrading five or so machines at > a time, every few days. We noticed improved performance on the CentOS > 6 boxes. But as the number of CentOS 6 boxes increased, we actually > saw performance on the CentOS 5 boxes decrease. By the time we had > only a few CentOS 5 boxes left, they were performing so badly as to be > effectively worthless. > > What we observed in parallel to this upgrade process was that the read > latency on our NetApp device skyrocketed. This in turn caused all > compute jobs to actually run slower, as it seemed to move the > bottleneck from the client servers' OS to the NetApp. This is > somewhat counter-intuitive: CentOS 6 performs faster, but actually > results in net performance loss because it creates a bottleneck on our > centralized storage. > > All indications are that CentOS 6 seems to be much more "aggressive" > in how it does NFS reads. And likewise, CentOS 5 was very "polite", > to the point that it basically got starved out by the introduction of > the 6.5 boxes. > > What I'm looking for is a "deep dive" list of changes to the NFS > implementation between CentOS 5 and CentOS 6. Or maybe this is due to > a change in the TCP stack? Or maybe the scheduler? We've tried a lot > of sysctl tcp tunings, various nfs mount options, anything that's > obviously different between 5 and 6... But so far we've been unable to > find the "smoking gun" that causes the obvious behavior change between > the two OS versions. > > Just hoping that maybe someone else out there has seen something like > this, or can point me to some detailed documentation that might clue > me in on what to look for next. > > Thanks! > You may want to try reducing sunrpc.tcp_max_slot_table_entries . In CentOS 5 the number of slots is fixed: sunrpc.tcp_slot_table_entries = 16 In CentOS 6, this number is dynamic with a maximum of sunrpc.tcp_max_slot_table_entries which by default has a value of 65536. We put that in /etc/sysconfig/modprobe.d/sunrpc.conf: options sunrpc tcp_max_slot_table_entries=128 You can't put this in /etc/sysctl.conf because the sunrpc kernel module is loaded before sysctl -p is done. peter

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Discuss April 2015