Discuss March 2013

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206 participants
228 discussions

network connectivity lost after reboot/upgrade
by Kai Schaetzl 05 Mar '13

05 Mar '13

I upgraded one of my old machines running 5.x to the latest kernel (from 308.24.1 to 348.1.1). After rebooting network connectivity was gone. I rebooted with the old kernel, I also tried the one before it (308.20.1) still no luck. So I assume it's got nothing to do with the kernel or even CentOS. But a hardware failure seems also unlikely, see below. ethtool shows the link as up and if I remove the cable as down. I attached a laptop via crossover cable, it detects the link, but same problem. I disabled iptables and set selinux to disabled. No change. There's a Xen VM running on that machine and I can ping it from the hardware. So, internal networking seems to be ok. I'm using bridged networking for Xen connectivity, setup by normal Red Hat means, not via Xen. Never had a problem. There are no errors in the logs, except for dhcpd telling network is down and named is also giving some weird errors. This is my only dhcpd, so I would like to have it up ASAP :-( Is there anything else besides a weird hardware failure that I could check? I'm going to get a new card tomorrow and see if that changes the situation. This is mobo internal networking based on nforce-MCP61. Has anyone seen such a hardware failure where the link goes up but no packets go over the wire? It seems a bit unlikely that this hardware failure (and nothing else) should happen on a reboot after an upgrade. Thanks. Kai

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ProLiant ML110 G7
by Juan De Mola 05 Mar '13

05 Mar '13

How I can set up CentOS 5 on it if it don't see the drives. -- Juan Pablo De Mola Rodríguez

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Centos6 ipsec troubles
by Riccardo Veraldi 05 Mar '13

05 Mar '13

Hello, it looks like the usual way to do ipsec on centos5 won't work anymore on centos6 I installed ipsec-tools but an interface type IPsec is not recognized by the kernel ifup ipsec0 Device does not seem to be present, delaying initialization. I am not planning to use the awful OpenSwan, I Want to sue the Kame implementation which was working fine on CentOS5 any hints ? thank you Rick

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CUPS halts when no Internet
by Juan De Mola 05 Mar '13

05 Mar '13

Hi. I have CentOS 6 on a HP ProLiant ML110 G7. We have a cobol invoicing system that prints to LPD printers on Windows hosts via CUPS. All works great until the ADSL service goes down. The printers stop working and the service restart gives a connection error. What will be happening here and how I can solve it? Our previous server was on CentOS 5 and worked OK. Thanks. -- Juan Pablo De Mola Rodríguez

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Finding matching words in a word game
by Alexander Farber 05 Mar '13

05 Mar '13

Hello, is there maybe a clever way of finding all possible words from a given set of letters by means of PostgreSQL (i.e. inside the database vs. scanning all database rows by a PHP script, which would take too long) - if the dictionary is kept in a simple table like: create table good_words ( word varchar(16) primary key, stamp timestamp default current_timestamp ); I could add a column above, where same letters as in "word" would be sorted alphabetically... but then I don't know. I've described my question in more detail at http://stackoverflow.com/questions/15220072/postgresql-and-word-games Thank you for any suggestions Alex

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Re: [CentOS] acrobat reader for x86_64?
by Fred Smith 05 Mar '13

05 Mar '13

On Mon, Mar 04, 2013 at 08:45:40AM +0100, Sorin Srbu wrote: > > -----Original Message----- > > From: centos-bounces(a)centos.org [mailto:centos-bounces@centos.org] On > > Behalf Of Fred Smith > > Sent: Saturday, March 02, 2013 5:03 AM > > To: centos(a)centos.org > > Subject: [CentOS] acrobat reader for x86_64? > > > > Adobe doesn't seem to have acroread for x86_64 linux, or at least I > > don't > > see it anywhere. > > > > Anybody know otherwise? > > > > Evince and other tools work pretty well, but I have always liked having > > the "real thing" around for those occasions when they don't. > > What would be the advantage running having this software in 64b? the "advantage" would be the diff between having it and not, as opposed to having it in 64-bit versus 32-bit. Modern 64-bit installs do not install all the 32-bit runtimes needed to run 32-bit programs, so having to use a 32-bit program can be painful, give you'd need to install a bazillion other files just to accommodate that one proggy. -- ------------------------------------------------------------------------------- .---- Fred Smith / ( /__ ,__. __ __ / __ : / / / / /__) / / /__) .+' Home: fredex(a)fcshome.stoneham.ma.us / / (__ (___ (__(_ (___ / :__ 781-438-5471 -------------------------------- Jude 1:24,25 ---------------------------------

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Please shed a light: when sssd will return from offline to online?
by Gelen James 05 Mar '13

05 Mar '13

Hi all, I'm new to sssd configs and debugging. Recently we have encountered some problems with sssd. Basically 6 out of 50 servers has 'getent passwd' lost all userIDs from LDAP backend, while others are OK. My sssd is at version 1.8.0-32. the related error messages are attached below. The sssd_nss seems got killed by temporarily network connection problems to backend openLDAP servers. Wonder why? and can we change the backend retry check interval? (see the timestamps for log entries in sssd_nss.log). [root@testbox sssd]# cat sssd_nss.log (Sat Mar 2 02:30:41 2013) [sssd[nss]] [sss_dp_init] (0x0010): Failed to connect to monitor services. (Sat Mar 2 02:30:41 2013) [sssd[nss]] [sss_process_init] (0x0010): fatal error setting up backend connector (Sat Mar 2 02:30:41 2013) [sssd[nss]] [sss_dp_init] (0x0010): Failed to connect to monitor services. (Sat Mar 2 02:30:41 2013) [sssd[nss]] [sss_process_init] (0x0010): fatal error setting up backend connector (Sat Mar 2 02:30:41 2013) [sssd[nss]] [sss_dp_init] (0x0010): Failed to connect to monitor services. (Sat Mar 2 02:30:41 2013) [sssd[nss]] [sss_process_init] (0x0010): fatal error setting up backend connector (Sat Mar 2 02:30:41 2013) [sssd[nss]] [sss_dp_init] (0x0010): Failed to connect to monitor services. (Sat Mar 2 02:30:41 2013) [sssd[nss]] [sss_process_init] (0x0010): fatal error setting up backend connector [root@testbox sssd]# cat sssd_pam.log (Sat Mar 2 02:30:09 2013) [sssd[pam]] [pam_dp_reconnect_init] (0x0010): Could not reconnect to ldap provider. (Sat Mar 2 02:30:39 2013) [sssd[pam]] [pam_dp_reconnect_init] (0x0010): Could not reconnect to ldap provider. [root@testbox sssd]# cat sssd_ldap.log (Sat Mar 2 02:30:53 2013) [sssd[be[ldap]]] [id_callback] (0x0010): The Monitor returned an error [org.freedesktop.DBus.Error.NoReply] [root@testbox sssd]# cat sssd.log (Sat Mar 2 02:30:41 2013) [sssd] [mt_svc_exit_handler] (0x0010): Process [nss], definitely stopped! [root@testbox sssd]# Please shed a light. Thanks a lot. --Gelen

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what does the strange sssd log mesages mean?
by Gelen James 05 Mar '13

05 Mar '13

Hi all, I have a few centos 6 boxes running sssd, they are talking to OpenLDAP server still runs on centos 5. Today I enabled sssd debugging and found the following lines of messages in logs: ... (Mon Mar 4 23:11:13 2013) [sssd[be[ldap]]] [get_naming_context] (0x0200): Using value from [namingContexts] as naming context. (Mon Mar 4 23:11:13 2013) [sssd[be[ldap]]] [sdap_get_server_opts_from_rootdse] (0x0200): No known USN scheme is supported by this server! (Mon Mar 4 23:11:13 2013) [sssd[be[ldap]]] [sdap_get_server_opts_from_rootdse] (0x0200): Will use modification timestamp as usn! ... what does the above messages mean: why it uses modification timestamp as usn? does that have some harmful effects, if time drifts /time zone difference exists in a network? Please shed a light. Thanks. --Gelen

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Re: [CentOS] preventing apache from being a mail relay
by Robert Moskowitz 05 Mar '13

05 Mar '13

On 03/03/2013 05:39 PM, Reindl Harald wrote: > > Am 03.03.2013 22:49, schrieb Robert Moskowitz: >> On 03/03/2013 04:33 PM, Reindl Harald wrote: >>> Am 03.03.2013 22:30, schrieb Robert Moskowitz: >>>> I am trying to recall back at least 2 years, and my notes are poor, and >>>> my searching appears to be worst... >>>> >>>> Seems I recall that last when I set up my apache server, the spammers >>>> were posting to it so it would send out the spam on port 25. There was >>>> some conf that I did to block this, but I did not document it, and I >>>> can't find any reference to this >>> what are you speaking about? >>> apache is a WEBSERVER and has NOTHING to do with email >> There was an attack, and if you search you will find references to it, where the spammers post to your web server >> in such a way that they relay out port 25. They send to your port 80, but you send out port 25. For example: >> >> http://forums.fedoraforum.org/archive/index.php/t-173601.html > only if you are so stupid and enable prxy-requests and load > any useless module becuse it exists - in other words: this > only affects poorly wrong configured setups which have way > larger problems as this one Once upon a time, it worked this way out of the box. I did NOT set up proxy, and I was being pounded, and found I had to turn it off. Now knowing what to look for, I found my notes and it was back on my '07 server. There is no reason for a general web server to function as a proxy, so for some time it has come with that part commented out. I looked a another '10 box (Centos 5.5) that had apache installed but never used and the proxy part was commented out. So yes, anyone turning on proxy today without care gets what they set up. But again, who needs proxying on a general web server?

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RAID MD10
by m.roth＠5-cent.us 05 Mar '13

05 Mar '13

I'm going to rebuild my system at home soon, and was planning to mirror two drives. However, I was just looking up something about RAID, and on wikipedia found some information about the Linux MD driver, and "near" and "far" RAID10. Anyone have some opinions about them? mark "or should that be how many opinions do folks have about them?"

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Discuss March 2013