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can non-owner change file group setup?
by mcclnx mcc 16 May '09

16 May '09

We are tried to count how many files belong to certain group. Our system administrator told us "non-owner" can easy change file group name to another. I have been tried several combination and never successful (only ROOT can change file group to other name). Does anyone know how "no-owner" can change file group name? Thanks. ______________________________________________________________________________________________________ 付費才容量無上限？Yahoo!奇摩電子信箱2.0免費給你，信件永遠不必刪！ http://tw.mg0.mail.yahoo.com/dc/landing

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Preventing hour-long fsck on ext3-filesystem
by Bernhard Gschaider 16 May '09

16 May '09

Hi! I'm justing in the process of setting up a new fileserver for our company. I'm installing CentOS 5.3 (64 bit) on it. One of the "problems" with it is that it has a 3.5TB filesystem for the user data which I formatted during setup as an ext3. Now my experience with our current fileserver is that a 0.5TB ext3 filesystem needs approx half an hour to complete (and kicks in every so and so reboots or every 180days). My estimate is that for the larger filesystem (and the faster machine) the fsck would need well over an hour (being optimistic). I dread the day when I have to reboot the server and wait for 2hours or more just because the system thought it would be a prudent thing to check the filesystem. My question: - is there another stable filesystem (XFS, ReiserFS ...) in the centosplus-kernel where this could be avoided (fsck is faster) and that is as safe as ext3 - Or would it be better to switch off automatic checking with tune2fs Any opinion/experience welcome. I looked around a bit but couldn't find a good answer Bernhard PS: Sorry for the stupid question, but I'm only part-time admin and testing this myself would take weeks, I guess -- --------------------------------------------------------------------------- DI Bernhard F.W. Gschaider --------------------------------------------------------------------------- EMail: Bernhard.Gschaider(a)ice-sf.at WWW : www.ice-sf.at Jabber : bgschaid(a)jabber.org Tel: +43(3842)98282-42 Fax: +43(3842)98282-02 ---------------------------------------------------------------------------

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Subversion causing Apache to hog memory
by Neil Aggarwal 15 May '09

15 May '09

Hello: I posted this to the subversion list yesterday and have not received a reponse. I am hoping someone on this list will be able to help me. I have a CentOS 5 server running subversion 1.5.6-0.2.el5.rf installed using yum from the rpmforge repository. I am using svnsync to mirror from another repository to the local machine. It is called from a cron job every 5 minutes. After a few days of running fine, I started getting this error from cron: svnsync: DAV request failed; it's possible that the repository's pre-revprop-change hook either failed or is non-existent svnsync: At least one property change failed; repository is unchanged svnsync: Error setting property 'sync-lock': Failed to start '/usr/local/svn/MyProject/hooks/pre-revprop-change' hook Looking in /var/log/httpd/error_log, I see this: Could not execute PROPPATCH. [500, #206] Failed to start '/usr/local/svn/MyProject/hooks/pre-revprop-change' hook [500, #165001] Can't start process '/usr/local/svn/MyProject/hooks/pre-revprop-change': Cannot allocate memory [500, #12] Looking at top, the machine has allocated all of the RAM available. When I stop httpd, the RAM comes back. I rebooted the machine and ran top in a shell. I then issued the svnsync command in another shell. I can see the memory usage going up each time I run the svnsync command but it does not seem to come down even after leaving the machine idle for a while. If I then stop httpd, the memory comes back. It looks like svnsync is somehow causing apache to hog memory. Any ideas? Thanks, Neil -- Neil Aggarwal, (832)245-7314, www.JAMMConsulting.com Eliminate junk email and reclaim your inbox. Visit http://www.spammilter.com for details.

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Dell 2950 with CentOS 5.3
by Kian Sin Teo 15 May '09

15 May '09

Hi all, Any one experience issue with Dell 2950 and CentOS 5.3, I face some issue like this, server install alright. Keep it in production for a while, Done an update one the server. Reboot , It said no boot devices found. Check on the perc6/i controller the both harddisk show online and optimal. Using live cd to check, the both harddisk still have the data. My issue was solve by removing the hard disk, clear the raid configuration. Put in the hard disk and reimport the configuration from the harddisk. The server able to boot up properly. any one know the cause of it, is it the Dell Hardware issue or it is an OS related issue. Regards KS

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Possible deadlock: Trying to lookup SID S-1-1-0 with passdb backend SAMBA
by JohnS 15 May '09

15 May '09

May 15 14:14:07 twittle winbindd[2635]: [2009/05/15 14:14:07, 0] nsswitch/idmap.c:idmap_init(772) May 15 14:14:07 twittle winbindd[2635]: ERROR: Initialization failed for alloc backend tdb, deferred! May 15 14:14:07 twittle winbindd[2598]: [2009/05/15 14:14:07, 0] nsswitch/winbindd_passdb.c:sid_to_name(126) May 15 14:14:07 twittle winbindd[2598]: Possible deadlock: Trying to lookup SID S-1-1-0 with passdb backend May 15 14:14:07 twittle winbindd[2598]: [2009/05/15 14:14:07, 0] nsswitch/winbindd_passdb.c:sid_to_name(126) May 15 14:14:07 twittle winbindd[2598]: Possible deadlock: Trying to lookup SID S-1-5-2 with passdb backend May 15 14:14:30 twittle nmbd[2633]: [2009/05/15 14:14:30, 0] nmbd/nmbd_become_lmb.c:become_local_master_stage2(396) [root@twittle ~]# rpm -q samba samba-3.0.33-3.7.el5 http://bugs.centos.org/view.php?id=2790 Does not Apply here. "vscan-clamav" runs in the Global Sections of all smb.confs of which I do not see a problem here. I have multiple smb.conf files that I use for testing. While it is not a big problem for me I imagine it is for others. The problem only happens when going from using an ldap backkend or AD ldap that is using winbind for enumeration of users and groups or if just in general the winbind service is running. On this happening no Samba Shares are accessable. Does anyone have a fix for this? Or Patch. JohnStanley

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CentOS-announce Digest, Vol 51, Issue 6
by centos-announce-request＠centos.org 15 May '09

15 May '09

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-2009:0480 Important CentOS 5 i386 poppler Update (Karanbir Singh) 2. CESA-2009:0480 Important CentOS 5 x86_64 poppler Update (Karanbir Singh) ---------------------------------------------------------------------- Message: 1 Date: Fri, 15 May 2009 09:28:58 -0400 From: Karanbir Singh <kbsingh(a)centos.org> Subject: [CentOS-announce] CESA-2009:0480 Important CentOS 5 i386 poppler Update To: centos-announce(a)centos.org Message-ID: <20090515132858.GA9569(a)tantra.karan.org> Content-Type: text/plain; charset=us-ascii CentOS Errata and Security Advisory 2009:0480 Important Upstream details at : https://rhn.redhat.com/errata/RHSA-2009-0480.html The following updated files have been uploaded and are currently syncing to the mirrors: ( md5sum Filename ) i386: a1dc7be72a743d7d4cb07038b8de13ff poppler-0.5.4-4.4.el5_3.9.i386.rpm 9ea19887606d2b1957747d3ba16d400e poppler-devel-0.5.4-4.4.el5_3.9.i386.rpm 00c559f4d6b38e34e28cd82651fb7586 poppler-utils-0.5.4-4.4.el5_3.9.i386.rpm Source: cba8ff5b883b3e04f42f097b8cf64c0f poppler-0.5.4-4.4.el5_3.9.src.rpm -- Karanbir Singh CentOS Project { http://www.centos.org/ } irc: z00dax, #centos(a)irc.freenode.net ------------------------------ Message: 2 Date: Fri, 15 May 2009 09:28:58 -0400 From: Karanbir Singh <kbsingh(a)centos.org> Subject: [CentOS-announce] CESA-2009:0480 Important CentOS 5 x86_64 poppler Update To: centos-announce(a)centos.org Message-ID: <20090515132858.GA9584(a)tantra.karan.org> Content-Type: text/plain; charset=us-ascii CentOS Errata and Security Advisory 2009:0480 Important Upstream details at : https://rhn.redhat.com/errata/RHSA-2009-0480.html The following updated files have been uploaded and are currently syncing to the mirrors: ( md5sum Filename ) x86_64: 65eaaa7f191f66aa5d61d298c891d0c2 poppler-0.5.4-4.4.el5_3.9.i386.rpm df503b731527cafb7a6ce5398557d606 poppler-0.5.4-4.4.el5_3.9.x86_64.rpm 98248d905f0b4515fb907759c2d2b1e2 poppler-devel-0.5.4-4.4.el5_3.9.i386.rpm 1e6a926dc19e4853fbcfa5c1b91c14e6 poppler-devel-0.5.4-4.4.el5_3.9.x86_64.rpm e47d4968583600583f6db99b753eb4a7 poppler-utils-0.5.4-4.4.el5_3.9.x86_64.rpm Source: cba8ff5b883b3e04f42f097b8cf64c0f poppler-0.5.4-4.4.el5_3.9.src.rpm -- Karanbir Singh CentOS Project { http://www.centos.org/ } irc: z00dax, #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 51, Issue 6 **********************************************

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openldap and nscd
by Manuel Monteiro 15 May '09

15 May '09

Hi, This email is a follow-up to my previous email about "Postfix: user unknown", perhaps these are related. Every time I restart openldap i get an error message from nscd: --- May 15 14:53:02 mail nscd: nss_ldap: could not search LDAP server - Server is unavailable --- This is due to a timeout, correct? Here is part of my /etc/ldap.conf --- timelimit 120 bind_timelimit 30 bind_policy soft idle_timelimit 3600 nss_initgroups_ignoreusers root,ldap --- Is there a way to solve this? Thanks, Manuel Monteiro

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Re: [CentOS] Dual-booting CentOS and WinXP
by Ned Slider 15 May '09

15 May '09

Sorin Srbu wrote: > Hi all, > > You know how I asked about procedures to build a dual-boot system with > CentOS and WinXP a while ago? Well, I I've begun with a test machine. > > What I had from start was a working CentOS 5.3 32b system. What I did was to > just add another empty drive configured as slave and then boot from the > Windows install cd. > > The most curious thing happened now, I get a blank screen after the Windows > installer screen saying something about "Setting up install procedure..." > just at the beginning. That is to say, this happens only if the hd with > CentOS is connected to power. If I disconnect the power connector to the > CentOS drive, the Windows installer happily goes on. > > Is this to be expected, that Windows won't install if it sees a hd with > another OS as master? > > Thanks for any hints. > It's a known issue - I've seen it affecting other distro's (Fedora in my case). It's a Windows XP thing, not specific to the distro, and only affects WinXP afaik (doesn't affect Win2K, couldn't care less about Vista). I first came across it trying to install WinXP on a system that had previously had Fedora on it and the installer hangs at a black screen. The "solution" is to do as you've done and disconnect the drive. If it's a single drive system, then install Windows first for dual booting, or if you just want to reinstall Windows over the top of a previous Linux installation then remove all Linux partitions with fdisk first.

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Printing graphics on CentOS 5.3
by MHR 14 May '09

14 May '09

I am absolutely thrilled and delighted to report that the problem I have been having on CentOS since I first started using it, back in 4.4, of having all images (graphics) print out from the image viewer as all-black pages appears to be gone! I just printed 13 graphics from the image viewer directly to my laser printer, and they're all excellent. I suppose it could be that I'm using a more-supported laser printer now (Brother 2140) than then (Minolta PagePro 1100), with a driver that actually works properly - I don't know. I'm just extremely pleased that this works, regardless pf who should get the blame/credit! Okay, I'm getting my breath back, now.... <RBFG> mhr

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Dealing with brute force attacks
by James B. Byrne 14 May '09

14 May '09

Over the weekend one of our servers at a remote location was hammered by an IP originating in mainland China. This attack was only noteworthy in that it attempted to connect to our pop3 service. We have long had an IP throttle on ssh connections to discourage this sort of thing. But I had not considered the possibility that other services were equally at risk. Researching this on the web does not reveal any comprehensive list of vulnerable ports or services. Most discussion centres on ssh, then some on ftp, and relatively few regarding pop3. So, my questions are these: 1. Should I throttle all new connections regardless of destination ports? In other words: are there any legitimate reasons that a single IP would require more than one new connection every 30 seconds or so? 2. Moving pass the obvious and unhelpful "everything", what services are particularly vulnerable to these types of attacks? Does a list exist anywhere? Regards, -- *** 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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