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CentOS Server Backup Options
by Scott Walker 17 Mar '12

17 Mar '12

What do you guys recommend for backing up a small CentOS server in a business environment. It will have (3) 300gb drives in a raid 5 array but I don't anticipate more than about 25gb of data that needs to be backed up each night. I want a lot of backups with a rotation scheme that included daily, weekly, and monthly copies. I want the daily copies of the data kept until the next week, and the weekly copy being kept for four weeks, and the monthly copies being kept for a year. The vendor is recommending a RD1000 Removable Disk device. This looks like it has great specs. Each cartridge holds 160gb (non-compressed) and the drive costs about $420 but seems that with each removable cartridge costing $128, we may be limited to how many cartridges we could have, thus perhaps not retaining backup instances as long as I like. I asked about a HP DAT160 tape drive. Each tape holds 160gb (non-compressed) and the drive costs about $730, and each tape only costs about $24, so it would be economical to have lots of backup instances saved for a long period of time. I have been using tape and the backup rotation scheme mentioned above for over 20 years. The vendor is telling me they don't recommend tape drives anymore and all of their customers are using removable hard drive for local backups. Am I missing something? My instincts tell me the tape drive is the right solution for a system with a small amount of data, where the system is used only from 8am - 5pm (so backup speed is not critical) and where we want to save backup instances for a long time before overwriting them. Any input would be welcomed.

16 45

Isues with YUM Update
by Robert Spangler 17 Mar '12

17 Mar '12

Hello all, Is this a known issue? From what I can tell it started on Tuesday. -------------------------------- ~ $ sudo yum -y update Password: Setting up Update Process Setting up repositories dag 100% |=========================| 1.1 kB 00:00 kbs-CentOS-Extras 100% |=========================| 1.9 kB 00:00 kbs-CentOS-Misc 100% |=========================| 1.9 kB 00:00 http://www.gtlib.gatech.edu/pub/centos/4.9/updates/i386/repodata/repomd.xml: [Errno 14] HTTP Error 404: Not Found Trying other mirror. http://ftp.osuosl.org/pub/centos/4.9/updates/i386/repodata/repomd.xml: [Errno 14] HTTP Error 404: Not Found Trying other mirror. http://mirror.sanctuaryhost.com/centos/4.9/updates/i386/repodata/repomd.xml: [Errno 14] HTTP Error 404: Not Found Trying other mirror. http://mirror.trouble-free.net/centos/4.9/updates/i386/repodata/repomd.xml: [Errno 14] HTTP Error 404: Not Found Trying other mirror. http://mirror.atlanticmetro.net/centos/4.9/updates/i386/repodata/repomd.xml: [Errno 14] HTTP Error 404: Not Found Trying other mirror. http://mirror.ubiquityservers.com/centos/4.9/updates/i386/repodata/repomd.x…: [Errno 14] HTTP Error 404: Not Found Trying other mirror. http://mirrors.greenmountainaccess.net/centos/4.9/updates/i386/repodata/rep…: [Errno 14] HTTP Error 404: Not Found Trying other mirror. http://mirror.san.fastserv.com/pub/linux/centos/4.9/updates/i386/repodata/r…: [Errno 14] HTTP Error 404: Not Found Trying other mirror. http://mirror.metrocast.net/centos/4.9/updates/i386/repodata/repomd.xml: [Errno 14] HTTP Error 404: Not Found Trying other mirror. http://mirrors.gigenet.com/centos/4.9/updates/i386/repodata/repomd.xml: [Errno 14] HTTP Error 404: Not Found Trying other mirror. http://centos.mirrors.hoobly.com/4.9/updates/i386/repodata/repomd.xml: [Errno 14] HTTP Error 404: Not Found Trying other mirror. http://mirror.umd.edu/centos/4.9/updates/i386/repodata/repomd.xml: [Errno 14] HTTP Error 404: Not Found Trying other mirror. http://mirror.raystedman.net/centos/4.9/updates/i386/repodata/repomd.xml: [Errno 14] HTTP Error 404: Not Found Trying other mirror. http://mirror.team-cymru.org/CentOS/4.9/updates/i386/repodata/repomd.xml: [Errno 14] HTTP Error 404: Not Found Trying other mirror. http://centos.eecs.wsu.edu/4.9/updates/i386/repodata/repomd.xml: [Errno 14] HTTP Error 404: Not Found Trying other mirror. http://yum.singlehop.com/CentOS/4.9/updates/i386/repodata/repomd.xml: [Errno 14] HTTP Error 404: Not Found Trying other mirror. http://mirror.wiredtree.com/centos/4.9/updates/i386/repodata/repomd.xml: [Errno 14] HTTP Error 404: Not Found Trying other mirror. http://mirrors.ecvps.com/centos/4.9/updates/i386/repodata/repomd.xml: [Errno 14] HTTP Error 404: Not Found Trying other mirror. http://mirrors.rit.edu/centos/4.9/updates/i386/repodata/repomd.xml: [Errno 14] HTTP Error 404: Not Found Trying other mirror. http://mirrors.tummy.com/mirrors/CentOS/4.9/updates/i386/repodata/repomd.xml: [Errno 14] HTTP Error 404: Not Found Trying other mirror. Cannot open/read repomd.xml file for repository: update failure: repodata/repomd.xml from update: [Errno 256] No more mirrors to try. Error: failure: repodata/repomd.xml from update: [Errno 256] No more mirrors to try. -------------------------------- -- Regards Robert Linux The adventure of a lifetime. Linux User #296285 Get Counted http://linuxcounter.net/

2 2

Kickstart network issues
by Daniel Lollman 16 Mar '12

16 Mar '12

Hello all - (Please forgive me if I sent this msg twice, first one didn't seem to go through) I searched through the archives and did not see anything about this (along with google), but if I missed something please don't hesitate to send me some links. Basically I have hit a problem that I cannot figure out at this point and seemed to have ran out of ideas via Google or the documentation. I am kickstarting (using cobbler) CentOS 6.2 installs over a private network (can reach the Internet). Part of the installations is to go grab various configuration files, rpm's, etc that are located both internal to the network (different subnet) and externally on the Internet somewhere. This problem seems to be intermittent since it works half of the time, but not the other half. Any of my kickstart scripts I have that use local commands (not wget'ing files) work just fine no problems. However when it comes to getting things from the network, it does not always get those files. Usually this errors out with a cannot resolve hostname error or no route to host. I have tried the following to overcome this: 1) During post-install, add a network start and sleep for 120 seconds to give it time to come up. 2) Made sure that the "network" commands in the kickstart included -activate 3) Tried making the downloads not depend on DNS which still does not work (no route to host). Are there any tricks to ensuring the network comes up during post-install for kickstart? By the way, after the kickstart is done and the VM boots up, there are no changes that need to be made to get the network up and running like normal... DNS, etc work fine immediately. Thanks for any help, Daniel

2 3

newer smartctl?
by m.roth＠5-cent.us 16 Mar '12

16 Mar '12

If y'all remember the problem I posted a while back, with a 3TB drive for userspace loosing it on a server, and spitting DRDY errors, but which work on everything else. Well, enough research, and conversation, and I may have found the problem: it's a Caviar Green, meant for a desktop, and the controller in the server has issues, because it uses TLER: http://hardforum.com/archive/index.php/t-1285254.html http://forums.dlink.com/index.php?topic=14603.0 In short, if it hits an error, it can take, in extreme cases, up to two min to recover; meanwhile, a RAID or HBA controller has hissy fits if it takes more than 7 or 15 seconds. I'm ready to test this out; the trouble is, either I d/l a DOS utility, or I find what, two years ago, was bleeding edge smartmontools; the one with 6.2, 5.39.1-5, does not allows smartctl -l scterc,70,70 /dev/sdb So, does anyone know a) what version might include that, and b) where I can find it? I have no problem building from a tarball, if I need to. mark

1 0

SiLK
by Steve Clark 16 Mar '12

16 Mar '12

Hi, Does anyone have the CERT SiLK tools packaged for CentOS 6.x? -- Stephen Clark *NetWolves* Director of Technology Phone: 813-579-3200 Fax: 813-882-0209 Email: steve.clark(a)netwolves.com http://www.netwolves.com

2 2

windbind and AD authentication - UPPER CASE usernames?
by Smithies, Russell 16 Mar '12

16 Mar '12

We're looking at using windbind and AD for our user account details but have run into a small snag. All user accounts in AD are upper case but our linux accounts are lower-case. Is there a simple solution we've overlooked? We really don't want to have to hack this... Thanx, Russell SMithies ======================================================================= Attention: The information contained in this message and/or attachments from AgResearch Limited is intended only for the persons or entities to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipients is prohibited by AgResearch Limited. If you have received this message in error, please notify the sender immediately. =======================================================================

2 1

CentOS-announce Digest, Vol 85, Issue 8
by centos-announce-request＠centos.org 16 Mar '12

16 Mar '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-2012:0393 Moderate CentOS 6 glibc Update (Johnny Hughes) ---------------------------------------------------------------------- Message: 1 Date: Thu, 15 Mar 2012 22:58:20 +0000 From: Johnny Hughes <johnny(a)centos.org> Subject: [CentOS-announce] CESA-2012:0393 Moderate CentOS 6 glibc Update To: centos-announce(a)centos.org Message-ID: <20120315225820.GA22433(a)chakra.karan.org> Content-Type: text/plain; charset=us-ascii CentOS Errata and Security Advisory 2012:0393 Moderate Upstream details at : https://rhn.redhat.com/errata/RHSA-2012-0393.html The following updated files have been uploaded and are currently syncing to the mirrors: ( sha256sum Filename ) i386: 5203d3d78574d3504c84eb9eeca11bb8c09ab1b7e2891ae6d843aac9e3178765 glibc-2.12-1.47.el6_2.9.i686.rpm dc604aaff9f552de3cbd0986cf5605cef8f45ad5402c37a59ec44314f0e72765 glibc-common-2.12-1.47.el6_2.9.i686.rpm e2a79ac041ea36c7733d01d67052085329f72e1c3e61b3be3bfebc3ccc05f77b glibc-devel-2.12-1.47.el6_2.9.i686.rpm ff06b95ca9f6e317574cbe9f0017c67320d2bd6be5a4953fd3da2a4ab64b6356 glibc-headers-2.12-1.47.el6_2.9.i686.rpm 9a4b957395e1f756ca216a7081e4bf06ed2075ce66809678d212be6fbb76f772 glibc-static-2.12-1.47.el6_2.9.i686.rpm 2f11c12ef2fc801435390e88514323b2ea9c8b9149a30b5a3a37acb62a837dd2 glibc-utils-2.12-1.47.el6_2.9.i686.rpm 15dd696100c56ebda546620b5186ec066b778bfa3df7c3e05f07de1e2419ad08 nscd-2.12-1.47.el6_2.9.i686.rpm x86_64: 5203d3d78574d3504c84eb9eeca11bb8c09ab1b7e2891ae6d843aac9e3178765 glibc-2.12-1.47.el6_2.9.i686.rpm 175e2642f97c18302c7bc3040ed971344008bcfb6943b6c47ed2cc4e2f506295 glibc-2.12-1.47.el6_2.9.x86_64.rpm 91258bea5f6c040a2d117584fd78f211ce3dfaefdafb4f3d8191b7fd6d80edcd glibc-common-2.12-1.47.el6_2.9.x86_64.rpm e2a79ac041ea36c7733d01d67052085329f72e1c3e61b3be3bfebc3ccc05f77b glibc-devel-2.12-1.47.el6_2.9.i686.rpm 00243cd4828c58aa4b7ea99dcaf59b8119b80c4ec3ff12962ba5d879c91a0d2f glibc-devel-2.12-1.47.el6_2.9.x86_64.rpm e9d451f5a55e3849ab809697c81ef3490a5e90df7160a724b0d48b17780557b6 glibc-headers-2.12-1.47.el6_2.9.x86_64.rpm 9a4b957395e1f756ca216a7081e4bf06ed2075ce66809678d212be6fbb76f772 glibc-static-2.12-1.47.el6_2.9.i686.rpm 7bd4cf5d52261fa0737e49532f654988fb7bdeffb6cdaef7bd9d838eafd62012 glibc-static-2.12-1.47.el6_2.9.x86_64.rpm b6ae506c0c986fb0a9a71c9266edd3515159959b08fcbc54eacd2723c516af36 glibc-utils-2.12-1.47.el6_2.9.x86_64.rpm 4c41e921e30980f76fb003dae56892633fb17354ffd69a926d070467d34e4d43 nscd-2.12-1.47.el6_2.9.x86_64.rpm Source: 307e99173aea76655ff6bd74c606dc936d7208e4f0df9f1c09b115953bf46ffd glibc-2.12-1.47.el6_2.9.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 85, Issue 8 **********************************************

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qemu-kvm for Centos 5 x86
by Bob Puff 16 Mar '12

16 Mar '12

Hey gang, I have been trying my hardest to get KVM running on a 32-bit CentOS 5. I know "upstream doesn't support it", but from what I gather, it *is* possible. I've tried downloading the KVM source, but get nailed on compile with: LINK i386-softmmu/qemu make -C /lib/modules/2.6.18-308.1.1.el5PAE/build M=`pwd` \ LINUXINCLUDE="-I`pwd`/include -Iinclude \ -Iarch/x86/include -I`pwd`/include-compat \ -include include/linux/autoconf.h \ -include `pwd`/x86/external-module-compat.h " \ "$@" LD /usr/local/kvm-88/kvm/kernel/x86/built-in.o CC [M] /usr/local/kvm-88/kvm/kernel/x86/svm.o In file included from /usr/local/kvm-88/kvm/kernel/x86/external-module-compat.h:16, from <command line>:1: /usr/local/kvm-88/kvm/kernel/x86/../external-module-compat-comm.h:551: error: static declaration of âcancel_work_syncâ follows non-static declaration include/linux/workqueue.h:117: error: previous declaration of cancel_work_sync was here In file included from /usr/local/kvm-88/kvm/kernel/x86/external-module-compat.h:16, from <command line>:1: /usr/local/kvm-88/kvm/kernel/x86/../external-module-compat-comm.h:607: error: expected identifier or ( before { token In file included from /usr/local/kvm-88/kvm/kernel/x86/external-module-compat.h:16, from <command line>:1: /usr/local/kvm-88/kvm/kernel/x86/../external-module-compat-comm.h:717: error: conflicting types for smp_call_function_many include/asm/smp.h:46: error: previous declaration of smp_call_function_many was here make[4]: *** [/usr/local/kvm-88/kvm/kernel/x86/svm.o] Error 1 make[3]: *** [/usr/local/kvm-88/kvm/kernel/x86] Error 2 make[2]: *** [_module_/usr/local/kvm-88/kvm/kernel] Error 2 make[1]: *** [all] Error 2 make: *** [kvm-kmod] Error 2 Has anyone built RPM packages for this? Ideas on how to compile? I'm running the kernel: 2.6.18-308.1.1.el5PAE Thanks. Bob

3 2

How to know if packet is dropped by kernel for udp checksum mismatch
by Arif Hossain 16 Mar '12

16 Mar '12

Hi all, I have a netfilter_queue app which de-obfuscates a already obfuscated udp packets. de-obfuscation process ends successfully but somehow packet is not reaching to the udp daemon. i'm suspecting this is happening because of a udp checksum mismatch. so i'm wondering how can i get logs of packets which are dropped because of udp checksum mismatch? i've heard linux by default dropps a packet if it does not have correct checksum if checksum is present, this behavior can be modified by recompiling the kernel. using a custom kernel is not in our agenda. my platform : Linux <hostname> 2.6.32-220.7.1.el6.x86_64 #1 SMP Wed Mar 7 00:52:02 GMT 2012 x86_64 x86_64 x86_64 GNU/Linux

1 0

postfix and spam, I am impressed
by Bob Hoffman 16 Mar '12

16 Mar '12

I have had the same email address since 1997 (when microsoft stole bob.com from me thanks to network solutions...) In the early days I of course was free with my email and used it everwhere. Fast forward to 2012, some 15 years later. woof..the amount of spam sent to me has always just kept getting worse and worse. On my centos 5 server I just used sendmail with spamassassin and it killed a lot. Still, 100s, sometimes more made it through. Then thunderbird would weed out more, learned as it went... Still, had an inbox with a lot of junk. Now I have set up a centos 6 box using postfix. Today I decided to try to add smtpd restrictions. After a lot of reading and testing I 'seem' to be doing incredible. I wanted to share my current working postfix smtpd restrictions area so that others who are interested can start with it. I just added the helo and sender restrictions and have noticed no problems yet. There were many things some sites said to add, but they killed some very legitimate mail. So...yesterday a few hundred mails in my box as usual. Plus I set up procmail to not delete spam so I could test. That gave me hundreds more.... 30 minutes since putting this up I went from 1 every few seconds to 1 in 30 minutes. And that was tagged by spamassassin as spam. 1. Not sure if this setup is perfect, but it is working quite well. Yes, the mail takes a few seconds longer and there is probably more I could do, but this ROCKS!!! smtpd_delay_reject = yes smtpd_helo_required = yes smtpd_client_restrictions = permit_mynetworks,permit smtpd_helo_restrictions = permit_mynetworks, reject_non_fqdn_helo_hostname, reject_invalid_helo_hostname, permit smtpd_sender_restrictions = permit_mynetworks, reject_non_fqdn_sender, reject_unknown_sender_domain, permit smtpd_recipient_restrictions = reject_non_fqdn_recipient, reject_unknown_recipient_domain, permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination, reject_invalid_hostname, reject_unauth_pipelining, reject_rbl_client zen.spamhaus.org, reject_rbl_client truncate.gbudb.net, reject_rbl_client dnsbl.njabl.org reject_rbl_client cbl.abuseat.org reject_rbl_client bl.spamcop.net, reject_rbl_client dnsbl.sorbs.net, sleep 1, permit smtpd_data_restrictions = permit_mynetworks, reject_multi_recipient_bounce, permit

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