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Strange happening with new users and keyed access on diskless cluster
by Joseph Norris 23 Nov '10

23 Nov '10

Hello to all, I have been battling this situation now for 3 days and still have not found a resolution. I appeal to any and all for help. Here are the facts as far as I can tell. 1) I moved a 66 node rocks based cluster to a diskless cluster using the latest version of Centos and all updates in place. 2) users are added with home directory mounted across the nodes on the cluster so a user's home directory would sit on /export/home with sym link from home on head node 3) sshkey-gen used to create public/private key in .ssh so that user can have keyless access to all nodes, allowing sge jobs to run across nodes. ( if I have left any information out above - please let me know ) So here is the problem: All of my current user base has had not issues what so ever with current arrangement and up to about a month ago I could create a user, use the the script that I have to build the keys and do an expect script out to each node answering yes to add access to known_hosts etc.... permissions correctly set on user .ssh directory and files. Now the problem: I build a new user - run my script and the users when ssh c33 ( name of a node ) gets a password challenge. I dink with the sshd_config for the nodes and not matter what I do I keep getting the password challenge or a permission error on publickey. I have done the ssh -vvv c33 and get "sending packet" but no return from openssh and then it defaults out to next method with no results. I have checked permissions with users that have no issue and as-far-as-I-can tell there is not issue. Now here is the real strange thing: I take a user that is already been on the system with no issues and delete the .ssh directory. Then I re-run my keybuilder bash script rebuilding the keys and setting the known_hosts and I get seamless ssh to all nodes. With the new users in the last month, do the same thing and I get the issues above. I am totally confused. Has something changed with an update? Do I need to do something different with the build of a new user that I did not have to do before? Do I have to do something in particular with my sshd_config file? Please give me any and all observations - I really need to resolve this issue. Thanks. -- Joseph Norris Applications Developer/Server Admin 209-228-4576

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Eclipse Helios on CentOS 5.5 (was Websites Up!)
by Mathieu Baudier 23 Nov '10

23 Nov '10

> Then I hope to finish my tutorial on installing Eclipse > Helios for Centos 5.5 Is there anything special to be done? I just unzipped the SR1 distribution for RCP/RAP developers linux-gtk-x86_64 and it works without problem on an up to date CentOS 5.5 x86_64. (to be more precise: I install it as root under /opt, install some plugins like subclipse and regular users start it from there)

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Re: [CentOS] Centos 6 installation memory requirements
by m.roth＠5-cent.us 23 Nov '10

23 Nov '10

Mathieu Baudier wrote: >> break out your wallet, blow the dust out, and spend a few bucks on some RAM > > Sometimes the hardware is so old, that it is not as easy as that to find the right RAM for it... > > I have some very old IBM PoS cashier machines (sic! got them for 30 EUR each, plenty of connectors, very well built) based on Celeron processors which valiantly run CentOS 5 for some tests/router/storage, etc., but I have a hard time finding RAM for them. > I think that they will never make it to CentOS 6 (maybe I'll switch them to Debian which I always found pretty good for low-end hardware). I've always been impressed with how solid IBM's hardware is. Anyway, one thing you might look at is to see what's running, and if you don't need it, turn it off, and maybe uninstall. If these are PoS boxen, do you need X windows? Do you need Gnome or KDE as windonw managers (look at smaller ones - I use IceWM at home, < 600k, yes, k, not M; the other admin here likes xfce)? mark

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Websites Up!
by Keith Roberts 23 Nov '10

23 Nov '10

Just a quick note to say that I have moved all my websites to a cloud platform with 99.99% uptime. So I apologise if anyone has been trying to get to the Kickstart User Guide and other Centos bits on my website. My home server is being worked on, and I'll just use that for development purposes from now on. Then I hope to finish my tutorial on installing Eclipse Helios for Centos 5.5 Kind Regards, Keith Roberts www.karsites.net www.php-debuggers.net www.raised-from-the-dead.org.uk -- In theory, theory and practice are the same; in practice they are not. This email was sent from my laptop with Centos 5.5

1 0

Upgrade from RHEL 6 beta ?
by Nicolas Ross 23 Nov '10

23 Nov '10

I've installed rhel 6 beta to start playing around with clustering, gfs2 and ldap. Will I be able to upgrade to centos 6 final or I'll have to re-install ? Nicolas

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Automount, External USB disk and e2fsck
by Robert Heller 23 Nov '10

23 Nov '10

Does Automount/autofs automagically run e2fsck? If so, how does one disable this? We have an external USB connected 2TB hard drive setup to automount. Sometimes e2fsck gets fired up, I think from Automount. I have this line in the automount config: /backupdisk -fstype=ext3,nocheck :LABEL=BACKUP I believe this should prevent Automount from running e2fsck, but it still runs it. (We have a cron job that daily does a e2fsck -p on this disk at a 'quiet' time.) -- Robert Heller -- 978-544-6933 / heller(a)deepsoft.com Deepwoods Software -- http://www.deepsoft.com/ () ascii ribbon campaign -- against html e-mail /\ www.asciiribbon.org -- against proprietary attachments

1 0

200 line kernel patch to improve performance
by Jerry Geis 23 Nov '10

23 Nov '10

There was an article about a kernel patch to improve performance. www.webupd8.org/2010/11/alternative-to-200-lines-kernel-patch.html it involves adding this to ~/.bashrc | if [ "$PS1" ] ; then mkdir -m 0700 /sys/fs/cgroup/cpu/user/$$ echo $$ > /sys/fs/cgroup/cpu/user/$$/tasks fi and this as root: ||mount -t cgroup cgroup /sys/fs/cgroup/cpu -o cpu mkdir -m 0777 /sys/fs/cgroup/cpu/user| My machine Centos 5.5 does not have a /sys/fs/cgroup Is there anything else to do instead? Jerry

2 1

redirecting time output
by Rainer Traut 23 Nov '10

23 Nov '10

Hi, am trying to pipe output from time command and output from a shell script to the mail program. So far it's not working as expected... # time echo "test" 2>&1 | mail -s "timetest" my(a)mail.com real 0m0.126s user 0m0.000s sys 0m0.000s The time command writes to stderror, but here the redirection seems to apply to the echo command? Thx Rainer

3 3

Fail Transfer of Large Files
by Michael D. Berger 23 Nov '10

23 Nov '10

On my intranet, I sometimes transfer large files, about 4G, to an CentOS old box that I use for a web server. I transfer with ftp or sftp. Usually, before the file is complete, the transfer "stalls". At that point, ping from the destination box to the router fails. I then deactivate the net interface on the destination box and then activate it. Ping is then successful, and the transfer is completed. The transferred file is correct, as verified with sha1sum. All connections are via cat6 wire. So what do you think? Should I try changing the net card? Any tests to run? Any other suggestions? Thanks for your help. Mike.

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Sendmail, localloop, and iptables -- should I be more paranoid?
by Robert Moskowitz 23 Nov '10

23 Nov '10

By default, sendmail only listens on the localloop: DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')dnl But by default to allow sendmail to even work the iptables entry is: -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 25 -j ACCEPT Without this, sendmail can't even connect to localloop. But should I handedit this line to something like: -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp -d 127.0.0.1 --dport 25 -j ACCEPT And once you handedit iptables, you can't use the gnome firewall applet, I suspect...

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