Discuss January 2014

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194 participants
174 discussions

Understanding iostat
by Lists 30 Jan '14

30 Jan '14

We have a load balancer/session server that manages sessions in small files. I did a grep on the directory of session files and the server load went from 0.50 to 10.x, for all intents and purposes we were down until I canceled the grep. According to this article on http://www.thattommyhall.com/2011/02/18/iops-linux-iostat/ tps is roughly analogous to iops. Running iostat on the device reports a tps that sometimes hits as high as 2000. Given a fairly standard 7200 RPM SATA drive, with potential IOPS as high as perhaps 100, how is this even remotely possible? Is it due to sequential writes? Thanks, Ben

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Apache Openmeeting on CentOS
by Ganesh Hariharan 30 Jan '14

30 Jan '14

Hi, I am pretty new to Openmeeting, and tried to follow the documentation for Openmeeting, and looks quite a challenge with bit and pieces of software to be compiled to make it work, I do not mind to sweat it out, but in the interim, just wanted to check if there is any YUM packages for it, Later G

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NIS or not?
by Sorin Srbu 29 Jan '14

29 Jan '14

Hi all, We're getting to a point in our linux environment where it's starting to be cumbersome to keep shadow and passwd-files up-to-date for the users to login on each computer. Scripts can only get us so far. 8-/ I've looked a bit into central login systems for linux, and NIS and LDAP seem to be prevalent. NIS being the simpler-to-setup solution for small to medium networks as I understand it, while LDAP is the more modern and scalable solution. See eg http://www.yolinux.com/TUTORIALS/NIS.html or http://sysadmin-notepad.blogspot.se/2013/06/nis-server-setup-on-rhelcentos.…. NIS-wise, what is a "small to medium network"? We have currently about 20-30'ish linux clients and servers, and the environment is not likely to increase much beyond this point. Is a 30ish-computer setup, a small network? The only thing I'm trying to accomplish is a system which will allow me to keep user accounts and passwords in one place, with one place only to administrate. NIS seems to be able to do that. Comments and insights are much appreciated! -- BW, Sorin ----------------------------------------------------------- # Sorin Srbu, Sysadmin # Uppsala University # Dept of Medicinal Chemistry # Div of Org Pharm Chem # Box 574 # SE-75123 Uppsala # Sweden# # Phone: +46 (0)18-4714482 # Visit: BMC, Husargatan 3, D5:512b # Web: http://www.orgfarm.uu.se ----------------------------------------------------------- # () ASCII ribbon campaign - Against html E-mail # /\ # # This message was not sent from an iProduct! # # MotD follows: # Artificial Intelligence: the art of making computers that behave like the ones in movies. -Bill Bulko

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Installing on USB Flash Drive
by Matt 29 Jan '14

29 Jan '14

Is it possible to install CentOS on a USB Flash Drive. Have boot sector, / and /boot on USB drive then put /home, etc on a software raid array of the physical drives. Thought there used to be motherboards with SDHC slots that you could use to boot off.

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Re: [CentOS] Single sign-on for CentOS-6
by James B. Byrne 29 Jan '14

29 Jan '14

On Wed, January 29, 2014 01:44, James A. Peltier wrote: > ----- Original Message ----- > | Does anyone here use a Samba4 setup for single sign-on for MS_Win > | workstations > | and CentOS-6 boxes? Does anyone here use it for imap and/or smtp > | authentication? We are experimenting with replacing our existing > | Microsoft > | domain controllers with Samba4 based controllers and are > | contemplating moving > | all authentication for all our systems, Microsoft and CentOS based, > | over to > | Samba when, or if, this replacement successfully completes. > | . . . > > I would have to ask why you're doing such a thing in the first place? You > have a perfectly good working Active Directory setup, that people are already > familiar with, I suspect with existing MS clients which integrate fully (and > "properly") and you want to replace it with a Samba based setup. Unless you > have a relatively simple setup, I would say don't change. However, if you are > looking to move to something else, then do that. Why fix to Samba? Why not > go with a full on Kerberos/LDAP environment? > > FWIW, we use CentOS 6 with Active Directory Authorization. Things have worked > fine for us for about 1 year. It took a VERY long time to get setup and > working, but it is now. The main reason is the age of the equipment and software. The current domain controller host is from c.2004 and the software is Microsoft Advanced Server 2000. The Windows 7 workstations work with this AD but there are a few quirks. As the equipment is well past its best before date we need to replace it. We have virtualised just about everything else saving only the desktop workstations and this is another candidate for virtualisation. As a company we are moving everything we can to FOSS and away from proprietary interests. Therefore the combination of moving from MS-AS2000 and a dedicated host to Samba4 running on a virtualised guest seems an attractive option, provided that it works. Thus my question. The research I have done seems quite promising. It is now possible to promote a Samba4 server to an AD domain controller and to transfer all the Flexible Single Master Operations (FSMO) roles to it. It should then be possible to promote a second virtualised Samba4 server running on a different virtualised guest running on a second hardware host as a domain controller. Once done then the original AD host can be demoted and shutdown. Providing Samba4 works as described of course, which is why I am asking if anyone else has done it. There remains an issue with the SysVol replication, there is not any, but this can be worked around via rsync and cron. However, this means that all directory maintenance has to be performed on just one of the DCs, which effectively returns us to the days of Primary/Secondary DCs. Since in our case we are down to just one AD as it is this is not a hardship. Do you have a writeup of what you had to do to get CentOS to authenticate against AD? -- *** 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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CentOS-announce Digest, Vol 107, Issue 15
by centos-announce-request＠centos.org 29 Jan '14

29 Jan '14

Send CentOS-announce mailing list submissions to centos-announce(a)centos.org To subscribe or unsubscribe via the World Wide Web, visit http://lists.centos.org/mailman/listinfo/centos-announce or, via email, send a message with subject or body 'help' to centos-announce-request(a)centos.org You can reach the person managing the list at centos-announce-owner(a)centos.org When replying, please edit your Subject line so it is more specific than "Re: Contents of CentOS-announce digest..." Today's Topics: 1. CEBA-2014:0101 CentOS 6 tzdata Update (Johnny Hughes) 2. CEBA-2014:0101 CentOS 5 tzdata Update (Johnny Hughes) ---------------------------------------------------------------------- Message: 1 Date: Tue, 28 Jan 2014 15:14:13 +0000 From: Johnny Hughes <johnny(a)centos.org> Subject: [CentOS-announce] CEBA-2014:0101 CentOS 6 tzdata Update To: centos-announce(a)centos.org Message-ID: <20140128151413.GA60532(a)n04.lon1.karan.org> Content-Type: text/plain; charset=us-ascii CentOS Errata and Bugfix Advisory 2014:0101 Upstream details at : https://rhn.redhat.com/errata/RHBA-2014-0101.html The following updated files have been uploaded and are currently syncing to the mirrors: ( sha256sum Filename ) i386: 8d3ecfc0c4ce1af2785550586aeddc1b38cc9fb50c28d645a779b355269aeda7 tzdata-2013i-2.el6.noarch.rpm e95040088250c2c51ef6322e71b4ec57a4604a2959271472be270704ac05aa03 tzdata-java-2013i-2.el6.noarch.rpm x86_64: 8d3ecfc0c4ce1af2785550586aeddc1b38cc9fb50c28d645a779b355269aeda7 tzdata-2013i-2.el6.noarch.rpm e95040088250c2c51ef6322e71b4ec57a4604a2959271472be270704ac05aa03 tzdata-java-2013i-2.el6.noarch.rpm Source: 8b8baa7d71bf297ad4306a06265d5366989e4d596bf032db7f9f14b1829c6e0b tzdata-2013i-2.el6.src.rpm -- Johnny Hughes CentOS Project { http://www.centos.org/ } irc: hughesjr, #centos(a)irc.freenode.net ------------------------------ Message: 2 Date: Tue, 28 Jan 2014 15:33:19 +0000 From: Johnny Hughes <johnny(a)centos.org> Subject: [CentOS-announce] CEBA-2014:0101 CentOS 5 tzdata Update To: centos-announce(a)centos.org Message-ID: <20140128153319.GA25836(a)chakra.karan.org> Content-Type: text/plain; charset=us-ascii CentOS Errata and Bugfix Advisory 2014:0101 Upstream details at : https://rhn.redhat.com/errata/RHBA-2014-0101.html The following updated files have been uploaded and are currently syncing to the mirrors: ( sha256sum Filename ) i386: 09690f610045d1ebdbf758e64c3f830e0de7bb497c06f4457b48e955c235e856 tzdata-2013i-2.el5.i386.rpm db29b0ce1800637cccc7f2d04e57e261ed932825d5d72b96cf47a5a4cabe2af8 tzdata-java-2013i-2.el5.i386.rpm x86_64: f32436e544ef826fc18a7bb394b22f04ff499c94d04f09f86f2a6cbdb236b9f5 tzdata-2013i-2.el5.x86_64.rpm 30dcd31b1b0a65b09739321b028f61253883322ca53dc338c585bafae02109ad tzdata-java-2013i-2.el5.x86_64.rpm Source: 0225a65afb8bdfac38e6f7dade72a58888e0c7087c2c675f31f6c068e3f1ea94 tzdata-2013i-2.el5.src.rpm -- Johnny Hughes CentOS Project { http://www.centos.org/ } irc: hughesjr, #centos(a)irc.freenode.net ------------------------------ _______________________________________________ CentOS-announce mailing list CentOS-announce(a)centos.org http://lists.centos.org/mailman/listinfo/centos-announce End of CentOS-announce Digest, Vol 107, Issue 15 ************************************************

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Reading .xlsx files with python?
by m.roth＠5-cent.us 29 Jan '14

29 Jan '14

Anyone know what package my user can use to read .xlsx files with python in CentOS 6? mark

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Re: [CentOS] 3g usb dongle - Huawei E1552
by Michael Lampe 29 Jan '14

29 Jan '14

Christo Larsen wrote: > Running Centos 6.4 6.5 is current, nobody cares for 6.4 anymore. > Any Idea´s? Put it into a Windows machine to switch it once. Then send it something like AT^U2DIAG=0 over the serial line to switch it permanently. -Michael

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Re: [CentOS] Need yumex in centos 6.4 -
by James B. Byrne 28 Jan '14

28 Jan '14

On Mon, January 27, 2014 12:58, Bob Goodwin - Zuni, Virginia, USA wrote: > > On 27/01/14 12:44, Ljubomir Ljubojevic wrote: >> You need 3rd party repositories. For these two you need EPEL. > Yes, I know that from Google but I need to know where and how to get it? > > I first downloaded 6.5 minimal but could never get it connected to my > Ethernet/LAN! > RedHat now disables Ethernet by default in RHEL6+. You will need to run ifup eth0 to connect after your first install. -- *** 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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Switch from Red Hat 7 Beta to CentOS
by Andreas Reschke 28 Jan '14

28 Jan '14

Hello, It is possible to switch from Red Hat 7 Beta to CentOS 7 (beta or final) when it exist? I would like to test newer software than CentOS 6.5 Mit freundlichen Grüßen / Kind regards Andreas Reschke

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Discuss January 2014