Discuss February 2012

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195 discussions

network intermitent, not sure if virtualization issue
by Bob Hoffman 07 Feb '12

07 Feb '12

I have a computer I am using to host a virtual machine. Centos 6, for both, 64 bit. The host machine's network connection seems fine. No problems. Trying to access the virtual machine is usually fine. but then, poof, ssh, http, ftp, all lose connection for about a minute. Then they come back up. I looked in all the logs on both machines, could find nothing, but not sure where to look. My question, would this be a setting on the VM as a webserver, some new centos 6 setting that just times out network when not in use? Or something that I did when I bonded my eth ports and bridged them? The bond covers the two onboard eth ports and one port from an add on network card. It is intermittent, seems to happen whenever, but service network restart on the webserver seems to fix it immediately, but it also just fixes itself too. is there some setting with centos 6 that must be changed to allow constant 'uptime' of the network?

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SSD Drives
by Matt 07 Feb '12

07 Feb '12

Has anyone installed a high I/O application such as an email server on SSD drives? Was thinking about doing two SSD's in RAID1. It would solve my I/O latency issues but I have heard that SSD's wear out quickly in high I/O situations? Something like each memory location only has X many writes before its done. Just wandering if anyone has tested it and if newer SSD's are better about this?

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Re: [CentOS] schily tools
by Dennis Clarke 07 Feb '12

07 Feb '12

> Let me comment some questions in one single mail: > >> My basic requirement with what I'm doing is to use standard tools and >> formats so that archives I write today can be readable in 10 years. > > Star becomes 30 in 4 months, any archive created since it's early > beginning in summer 1982 can still be read back. I have been using it for about a decade or more and anything I dumped has been a no brainer to retrieve, on any other OS or even architecture. >> I don't think there is any such general consensus. Are you reading >> something that favors Solaris/*bsd over GNU based systems? > > Schily tools (and in special star) implement support for Linux specific > extensions. This is what you do not get from gtar at all. So why do Linux > distros prefer gtar even though there is no Linux support? Is there any correlation between this and the warning message I see during a bootstrap like so : Warning: *** /usr/src/linux/include contains broken include files *** Warning: *** /usr/src/linux/include is not used this reason *** Warning: This may result in the inability to use recent Linux kernel interfaces Warning: *** linux/ext2_fs.h is not usable at all *** Warning: *** This makes it impossible to support Linux file flags *** You may try to compile using 'make COPTX=-DTRY_EXT2_FS' >> I doubt if they are as well maintained in linux distros as the GNU >> tool set, particularly in terms of having recent fixes backported into >> the versions carried in enterprise distros. > > gtar still did not fix bugs I reported in 1993 (e.g. the bug that > causes gtar to complain with "skipping to next header" even on it's > own archives). I am thus sure that star not not worse than gtar.... There seems to be something missing here. The subject was "schily tools" which is a lot more than star : root@rsync:/etc/default# ls /opt/schily/bin bosh cdrecord isodebug mdigest pfsh sfind star ustar bsh change isodump mkhybrid pxupgrade sformat star_sym ved btcflash compare isoinfo mkisofs readcd sgrow suntar ved-e calc copy isovfy mt sccs sh tar ved-w calltree count jsh od scgcheck smake tartest cdda2mp3 devdump label opatch scgskeleton smt termcap cdda2ogg gnutar lndir p scpio spatch translit cdda2wav hdump match pfbsh sdd spax udiff care to comment on any of these ? Certainly bosh needs a few words. dc -- -- http://pgp.mit.edu:11371/pks/lookup?op=vindex&search=0x1D936C72FA35B44B +-------------------------+-----------------------------------+ | Dennis Clarke | Solaris and Linux and Open Source | | dclarke(a)blastwave.org | Respect for open standards. | +-------------------------+-----------------------------------+

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Problems installing 6.2 on HP 8540w laptop
by david 07 Feb '12

07 Feb '12

Folks I've been trying to install Centos 6.2 on an HP Mobile Workstation 8540w. For various reasons, I have restarted the install many times.I use the 64-bit DVD image. The install chooses the following options a) Install with Basic Video Driver b) Skip the media scan c) Default Country, Language, Basic Storage Devices, change time zone d) Fresh Installation e) Configure network, (turn on wired Always Connect). f) Hit ALT-B to get back to examining storage devices. (I found I had to do this to get the HostName field filled in with the defaults from DHCP). [See below, frequent hangs here, in which case I power down and start again] g) If I get beyond the HostName stage, I choose the Virtual Host method and the install goes to completion successfully. The machine is connected with an ethernet cable to a LAN that is my internal NAT'ted system. The wireless button indicates disabled. I have been getting varied results with (presumably) the same starting conditions. In each case, I power off the machine, wait a few seconds, and power it on with the DVD image in place, choose "Install with basic video driver", and go through the same sequence. On many attempts, the installation sequence finishes just right, and the reboot gives me the expected root prompt. The USB mouse does not work during install, so I have to use the keyboard and touch-pad pointers. Among the anomalies I get are: 1) The first "Waiting for hardware to initialize..." is as far as it goes. Usually, it's done in a couple of seconds and goes on to a second hardware scan. Sometimes it hangs for over a minute before I give up. 2) The install appears to come to the end, the DVD is ejected, and I hit ENTER to reboot. The reboot starts and the screen goes dark. Power down and power up to boot from HD succeeds, but there was a flash of about three lines on the screen before the blue sliding bar appeared. 3) The install sequence hangs with the screen all blue except for the bottom line which reads "Running anaconda 13.21.149, the CentOS installer, Please wait ... Then after about a minute the screen blinks and goes dark. 4) The install sequence hangs on "Media Detected - Found local installation media", the CD drive idled down. 5) The install sequence hangs on "Examining Devices, Examining storage devices, with the blue slider almost at the left edge. Although this screen appears several times, the instance that hangs is the one after I've activated the wired network and hit Back. In most cases, if the system gets to the point of choosing the Virtual Host option, the installation completes successfully. So, -- is this an issue with the install procedure? Does it not treat this hardware correctly? Is there some other startup method or option I could use?

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Re: [CentOS] rsync from rescue boot
by Les Mikesell 07 Feb '12

07 Feb '12

On Tue, Jan 31, 2012 at 4:01 PM, <m.roth(a)5-cent.us> wrote: >> On Tue, Jan 31, 2012 at 3:14 PM, Ljubomir Ljubojevic <office(a)plnet.rs> >> wrote: >>> On 01/31/2012 09:47 PM, Les Mikesell wrote: >>>> No, I'm trying to have rsync make an outbound connection over ssh from >>>> the rescue environment and getting what looks like an argument error >>>> from ssh. Ssh itself works and I can connect to the same target if I >>>> run it directly, and the exact same rsync command lines work from a >>>> normal host. Either rsync isn't setting up the remote command right, >>>> or ssh isn't allowing it and giving a bad error message. > <snip> >> I'm going the other direction (originating the command from the rescue >> host), but yes, tar works over ssh, and and ssh works by itself. The >> part that doesn't work is ssh when invoked by rsync, either by default >> or with an explicit '-essh' argument, and the error message looks like >> an ssh argument error so it doesn't even prompt for the password. > > AUGH! I think I have it: are the versions of rsync on the rescue instance > and the other server the same? It's not getting that far. I'm getting an error trying to start the local ssh. And at this point I have working VM from the tar copy, _except_ that it isn't matching a driver to the virtual NIC. I'm glad I'm not restoring a real backup with a dead machine here... Since I don't need this today, I think I'll try ReaR to see if it gets it right. It builds a bootable iso that is supposed to re-install on bare metal. -- Les Mikesell lesmikesell(a)gmail.com

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CentOS-announce Digest, Vol 84, Issue 4
by centos-announce-request＠centos.org 07 Feb '12

07 Feb '12

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. CESA-2012:0060 Moderate CentOS 5 openssl Update (Johnny Hughes) ---------------------------------------------------------------------- Message: 1 Date: Tue, 7 Feb 2012 12:39:01 +0000 From: Johnny Hughes <johnny(a)centos.org> Subject: [CentOS-announce] CESA-2012:0060 Moderate CentOS 5 openssl Update To: centos-announce(a)centos.org Message-ID: <20120207123901.GA1929(a)chakra.karan.org> Content-Type: text/plain; charset=us-ascii CentOS Errata and Security Advisory 2012:0060 Moderate Upstream details at : https://rhn.redhat.com/errata/RHSA-2012-0060.html The following updated files have been uploaded and are currently syncing to the mirrors: ( sha256sum Filename ) i386: 4e24142e043d6a22161c589ae9a3845255c85db2e5f6a4f25c91c87d424d61ef openssl-0.9.8e-20.el5_7.1.0.1.centos.i386.rpm 79e1510c19787a433c4c65d4887cc7ce4a8e511826ea2e714ce10ad59dcf398e openssl-0.9.8e-20.el5_7.1.0.1.centos.i686.rpm 77592fb450989aa7e2d4ebf311de0714ebed529ce58409bec2d718bee70d843c openssl-devel-0.9.8e-20.el5_7.1.0.1.centos.i386.rpm 832af976fbd8d82ee748ad2ac696697c56324c09af89990b8215f705f81feaef openssl-perl-0.9.8e-20.el5_7.1.0.1.centos.i386.rpm x86_64: 79e1510c19787a433c4c65d4887cc7ce4a8e511826ea2e714ce10ad59dcf398e openssl-0.9.8e-20.el5_7.1.0.1.centos.i686.rpm 41b00785ba5d7f79b686d0981f940fbd75f729110189eb693af3d10afccff71a openssl-0.9.8e-20.el5_7.1.0.1.centos.x86_64.rpm 77592fb450989aa7e2d4ebf311de0714ebed529ce58409bec2d718bee70d843c openssl-devel-0.9.8e-20.el5_7.1.0.1.centos.i386.rpm 163bf5f13d8a767deecc71b70b5e6237c7aa44208af0234980e78b66a2d21221 openssl-devel-0.9.8e-20.el5_7.1.0.1.centos.x86_64.rpm 4c3b5206a1fa079325f3b08f3ee81af5a9289f4521d5614d41e5501ad47aa976 openssl-perl-0.9.8e-20.el5_7.1.0.1.centos.x86_64.rpm Source: 27eb8351655accb27eb1380af188980bd9cec322834c93a0247ccdba44ca6b75 openssl-0.9.8e-20.el5_7.1.0.1.centos.src.rpm NOTE: This is a reissue of RPMS due to a md5sum error in shared document files that prevented the i686 and x86_64 RPMS to be installed simultaneously on an x86_64 machine. See http://bugs.centos.org/view.php?id=5489 for details. -- 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 84, Issue 4 **********************************************

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new mysql installation, kinda stuck
by Bob Hoffman 07 Feb '12

07 Feb '12

I installed centos 6 as a webserver. It installed mysql. However, I guess I need mysql-server for me to use it for php and my website. I installed that. I am unable to give root a password and can go no further. I have tried mysql-secure-installation and I just get stuck at errors and no progression. I have tried mysqladmin -u root password <password> and the accompanying one that includes the hostname. ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES) I am unable to use mysql with php or do anything at all with it. It was strange it installed mysql but I guess this version is different and needs more packages to work within a webserver. all attempts at using mysql without mysql-server installed just results in nothing being found (like mysqld) and the like...so I had to install the server. In 5.x I could just use mysqladmin and add roots, delete anonymous, etc. However, this time I am stuck. I uninstalled mysql-server, the perl thing that comes with it, and mysql itself, then reinstalled them, that got me no where. gotta be something I am missing here. thanks for listening.

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Re: [CentOS] install detecting disk as sdb not sda
by wwp 07 Feb '12

07 Feb '12

Hello Reindl, On Fri, 03 Feb 2012 23:19:26 +0100 Reindl Harald <h.reindl(a)thelounge.net> wrote: > > > Am 03.02.2012 23:02, schrieb wwp: > > An aspect of the problem w/ that behaviour change introduced w/ recent > > kernel updates, is that some mount mapping tables (fstab for instance) > > are broken if they rely on mount order (sda, hda, etc.) instead of > > device ID or label. > > if they are doing so they are broken all the time by design > > the last 10 years i saw no single machine not using LABEL and > the last 4 years no single one not using UUID, even in my RAID10 > i can plug any disk whereever i want Interesting.. my habits seem very old then :-). A long time after setting up my CentOS6, I decided to create a partition in extended area for my personal data, and to automount it at boot. This is done in fstab with: /dev/sda8 /storage/data ext4 noatime,nodiratime 0 0 (see how I rely on sda, silly me!) I grabbed the UUID from `lshal` and replaced it in fstab: UUID=005374e2_5c18_437d_84d8_8069868fe54e ext4 noatime,nodiratime 0 0 .. no luck, it doesn't automount at boot. I think I'll have to investigate or get another brain update. Regards, -- wwp

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distributed storage/home-made cloud recommendations
by Boris Epstein 07 Feb '12

07 Feb '12

Hello listmates, This is not specifically CentOS-related - though I will probably execute this design on CentOS if I decide to do so. It will certainly be some kind of Linux. At any rate, here's my situation. I would like to build a fairly large storage solution (let us say, 100 TB). I want this solution to be distributed and redundant. I want to be able to lose part of the machines involved and still stay operational (the bigger part, the better). I would prefer to avoid having to buy large servers to accomplish this task. What I am soliciting here is thoughts, reports from experience, recommendations, etc. Thanks in advance. Boris.

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where to download CENTOS 4.9 DVD image?
by mcclnx mcc 07 Feb '12

07 Feb '12

I want to CENTOS site and try to download version 4.9. I found all download sites ONLY have 4.8 NO 4.9. anyone know where can i download CENTOS 4.9 DVD image? Thanks.

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Discuss February 2012