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find most recent file update in directory
by Helmut Drodofsky 13 Dec '11

13 Dec '11

Hello, I try to find in a directory hicharchy the most recent time of file update. I think, there could be a solution with find? Thank you for help in advance Best regards Helmut Drodofsky

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iSCSI best practices
by Alan McKay 12 Dec '11

12 Dec '11

Hey folks, I had some general questions and when reading through the list archives I came across an iSCSI discussion back in February where a couple of individuals were going back and forth about drafting up a "best practices" doc and putting it into a wiki. Did that ever happen? And if so, where is it? Now my questions : We are not using iSCIS yet at work but I see a few places where it would be useful e.g. a number of heavy-use NFS mounts (from my ZFS appliance) that I believe would be slightly more efficient if I converted them to iSCSI. I also want to introduce some virtual machines which I think would work out best if I created iSCSI drives for them back on my Oracle/Sun ZFS appliance. I mentioned iSCSI to the guy whose work I have taken over here so that he can concentrate on his real job, and when I mentioned that we should have a separate switch so that all iSCSI traffic is on it's own switch, he balked and said something like "it is a switched network, it should not matter". But that does not sit right with me - the little bit I've read about iSCSI in the past always stresses that you should have it on its own network. So 2 questions : - how important is it to have it on its own network? - is it OK to use an unmanaged switch (as long as it is Gigabit), or are there some features of a managed switch that are desirable/required with iSCSI? thanks, -Alan -- “Don't eat anything you've ever seen advertised on TV” - Michael Pollan, author of "In Defense of Food"

18 38

auto-creating a local yum cache?
by Alan McKay 12 Dec '11

12 Dec '11

Hey folks, I just did an update on a system that is taking the better part of a day ( 5.3 ---> 5.7 ) mainly due to file download times. And I have 4 or 5 more systems to do. I know I can create my own repository and then point them at it - but that is difficult here because rsync is blocked (ggrrrrrr...) Surely there must be a way to have yum on the first box automatically cache everything and then have the other boxes use the cache? Maybe if not directly, then with squid or something like that? Anyone happen to have done this before? thanks, -Alan -- “Don't eat anything you've ever seen advertised on TV” - Michael Pollan, author of "In Defense of Food"

5 5

CentOS 6.2 progress.
by Lamar Owen 12 Dec '11

12 Dec '11

For those who don't follow the QA RSS, see: http://qaweb.dev.centos.org/qa/node/120 to get the latest info on the status of 6.2. Looks good so far!

4 4

not NetworkManager but dhclient turned off yet clobbered yp.conf on boot
by Thomas Burns 12 Dec '11

12 Dec '11

Oops! The actual clue in yp.conf is: ; generated by /sbin/dhclient-script So I was looking in the wrong place. Dave On Mon, Dec 12, 2011 at 8:53 AM, Thomas Burns <tburns(a)hawaii.edu> wrote: > A system had a disk problem, I took out the disk, mounted on another > system, tweaked around until I thought the disk problem was fixed, then put > it back in the original system. I did not edit any config files among the > tweaks. When I booted the system, NIS was not working right. I found that > these files had been changed: /etc/yp.conf /etc/resolv.conf /etc/ntp.conf > /etc/auto.master /etc/hosts.allow. A comment in the new bogus yp.conf > indicated it had been created by NetworkManager. But Networkmanager is not > active: > > # chkconfig --list|grep -i netw > NetworkManager 0:off 1:off 2:off 3:off 4:off 5:off 6:off > network 0:off 1:off 2:on 3:on 4:on 5:on 6:off > > Did hald or something like that run some NetworkManager stuff? How could > this happen, or rather, how do I prevent this from ever happening again? > > mahalo, > Dave > -- Q: Why should this email be 5 sentences or less? A: http://five.sentenc.es IPRC-help FAQ: http://auana1.soest.hawaii.edu/wiki/index.php/Faq

1 0

yum - sqlite SIGSEVG
by Paul Heinlein 12 Dec '11

12 Dec '11

I've got a CentOS 6.1 x86_64 VM running atop CentOS 6.1 x86_64 KVM host. The VM is in production, so any fix needs to be fairly non-intrusive. In the VM, yum consistently segfaults when reading non-base repositories. The problem appears to be related to the faulty creation of /var/cache/yum/x86_64/<<reponame>>/primary.xml.gz.sqlite The latest installment of this problem is related to the 6.1 cr repository, but it's happened with other non-base repos in the past. Steps to duplicate, fix, and re-duplicate the problem: 1. "yum clean all && yum update" will segfault. strace shows that the SIGSEGV is received while doing work in the cr repository. 2. Run "yum clean all && yum update" on a different CentOS machine that uses the exact same yum repositories. The copy /var/cache/yum/x86_64/6/cr/primary.xml.gz.sqlite from the working machine to the broken one. 3. "yum update" on the broken machine works flawlessly! 4. "yum clean all && yum update" on the broken machine (which removes and tries to rebuild the .sqlite file) will segfault once again. The primary.xml.gz.sqlite file that gets created on the broken VM is quite a bit smaller than that on all my working machines. On the broken machine, it looks like PRAGMA foreign_keys=OFF; BEGIN TRANSACTION; CREATE TABLE db_info [...]; CREATE TABLE packages [...]; # several more CREATE TABLE commands CREATE TRIGGER removals [...]; COMMIT; On all my working machines, it looks like PRAGMA foreign_keys=OFF; BEGIN TRANSACTION; CREATE TABLE db_info [...]; INSERT INTO "db_info" [...]; CREATE TABLE packages [...]; # several more CREATE TABLE commands CREATE TRIGGER removals [...]; CREATE INDEX packagename [...]; # several more CREATE INDEX commands COMMIT; The working machine all do an INSERT into db_info and create several indexes; the broken machine does not. Otherwise, the sql statements are identical. On the broken machine, I've done yum reinstall sqlite yum reinstall python yum reinstall yum\* But the outcome is the same. The problem is limited to this VM. Other VMs on the same host have no such difficulties. Anyone have a clue? -- Paul Heinlein <> heinlein(a)madboa.com <> http://www.madboa.com/

1 0

NetworkManager turned off yet clobbered yp.conf on boot?
by Thomas Burns 12 Dec '11

12 Dec '11

A system had a disk problem, I took out the disk, mounted on another system, tweaked around until I thought the disk problem was fixed, then put it back in the original system. I did not edit any config files among the tweaks. When I booted the system, NIS was not working right. I found that these files had been changed: /etc/yp.conf /etc/resolv.conf /etc/ntp.conf /etc/auto.master /etc/hosts.allow. A comment in the new bogus yp.conf indicated it had been created by NetworkManager. But Networkmanager is not active: # chkconfig --list|grep -i netw NetworkManager 0:off 1:off 2:off 3:off 4:off 5:off 6:off network 0:off 1:off 2:on 3:on 4:on 5:on 6:off Did hald or something like that run some NetworkManager stuff? How could this happen, or rather, how do I prevent this from ever happening again? mahalo, Dave

1 0

CentOS-announce Digest, Vol 82, Issue 7
by centos-announce-request＠centos.org 12 Dec '11

12 Dec '11

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-2011:1535 CentOS 5 i386 sos Update (Johnny Hughes) 2. CEBA-2011:1535 CentOS 5 x86_64 sos Update (Johnny Hughes) 3. Using sha256sum instead of md5sum for package checksums (Johnny Hughes) ---------------------------------------------------------------------- Message: 1 Date: Mon, 12 Dec 2011 11:24:24 +0000 From: Johnny Hughes <johnny(a)centos.org> Subject: [CentOS-announce] CEBA-2011:1535 CentOS 5 i386 sos Update To: centos-announce(a)centos.org Message-ID: <20111212112424.GA6908(a)chakra.karan.org> Content-Type: text/plain; charset=us-ascii CentOS Errata and Bugfix Advisory 2011:1535 Upstream details at : https://rhn.redhat.com/errata/RHBA-2011-1535.html The following updated files have been uploaded and are currently syncing to the mirrors: ( md5sum Filename ) i386: 95167d3a8c507005d52afef139d3eebc sos-1.7-9.54.el5_7.1.noarch.rpm Source: 41f32c5c29d3ce6e241802730cd663b6 sos-1.7-9.54.el5_7.1.src.rpm -- Johnny Hughes CentOS Project { http://www.centos.org/ } irc: hughesjr, #centos(a)irc.freenode.net ------------------------------ Message: 2 Date: Mon, 12 Dec 2011 11:24:24 +0000 From: Johnny Hughes <johnny(a)centos.org> Subject: [CentOS-announce] CEBA-2011:1535 CentOS 5 x86_64 sos Update To: centos-announce(a)centos.org Message-ID: <20111212112424.GA6925(a)chakra.karan.org> Content-Type: text/plain; charset=us-ascii CentOS Errata and Bugfix Advisory 2011:1535 Upstream details at : https://rhn.redhat.com/errata/RHBA-2011-1535.html The following updated files have been uploaded and are currently syncing to the mirrors: ( md5sum Filename ) x86_64: 95167d3a8c507005d52afef139d3eebc sos-1.7-9.54.el5_7.1.noarch.rpm Source: 41f32c5c29d3ce6e241802730cd663b6 sos-1.7-9.54.el5_7.1.src.rpm -- Johnny Hughes CentOS Project { http://www.centos.org/ } irc: hughesjr, #centos(a)irc.freenode.net ------------------------------ Message: 3 Date: Mon, 12 Dec 2011 06:39:04 -0600 From: Johnny Hughes <johnny(a)centos.org> Subject: [CentOS-announce] Using sha256sum instead of md5sum for package checksums To: CentOS-Announce <centos-announce(a)centos.org> Message-ID: <4EE5F5E8.4060207(a)centos.org> Content-Type: text/plain; charset="iso-8859-1" There are known Collision Attacks for the MD5SUM method of hashing, so it is possible to modify a file and make it have the same MD5SUM as another file. See this link for details on Collision Attacks: http://en.wikipedia.org/wiki/Collision_attack Recommendation from the US-CERT concerning MD5SUM hashes: http://www.kb.cert.org/vuls/id/836068 Based on the above information, the CentOS team will be using sha256sum (sha-2) and not md5sum to generate future hashes for posting on our e-mail announcements to the CentOS Announce Mailing List. Thanks, Johnny Hughes The CentOS Project

1 0

What CentOS means?
by LinuxIsOne 12 Dec '11

12 Dec '11

Hi, I was thinking from where the word 'centos' came and what it means? How they choose this word?

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bash on Centos 5 can not source FIFOs ...
by Timothy Madden 12 Dec '11

12 Dec '11

Hello I run into this problem on CentOS 5.7 (Final), that if I try to source a FIFO in bash, my command will be silently ignored and nothing from the FIFO is interpreted. Here is a simple example: [root@appserver2 ~]# mkfifo /tmp/myfifo [root@appserver2 ~]# echo ls -l >/tmp/myfifo & [2] 23771 [root@appserver2 ~]# source /tmp/myfifo # no `ls´ output here... [root@appserver2 ~]# rm /tmp/myfifo rm: remove fifo `/tmp/myfifo'? y [2]+ Exit 1 echo ls -l > /tmp/myfifo [root@appserver2 ~]# CentOS 5.7 comes with 'GNU bash, version 3.2.25(1)-release (x86_64-redhat-linux-gnu)'. I can see from posting in the bash group that the same bash 3.2 (and older) on a different distribution can source the FIFO as expected: nntp://news.gmane.org/gmane.comp.shells.bash.bugs/17652 http://thread.gmane.org/gmane.comp.shells.bash.bugs/17649/focus=17652 Can this be a CentOS/packaging issue ? Thank you, Timothy Madden

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