Discuss January 2008

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311 participants
383 discussions

The iostat command
by Indunil Jayasooriya 03 Jan '08

03 Jan '08

Hi All, I am learning iostat command to understand disk I/O statistics. We have 2 Centos 4 servers running where oracle is installed.We installed them 2 weeks ago. @ that time, These Servers performed well. But, Now We have come to know that these 2 Machines are quite slow when comparing to the first week. So, Some say, run iostat to see statictics. I am not familiar with comamnd well. I found below url http://www.redhat.com/docs/manuals/enterprise/RHEL-4-Manual/admin-guide/s1-… And, I have still not understood it fully. Could you pls advice me , If you have experience with iostat? In adition to that, What are the other tools I can use? I have already used, top , vmstat commands Hope to hear from you. -- Thank you Indunil Jayasooriya

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Java applets plugins for Mozilla Firefox
by Andrew Allen 03 Jan '08

03 Jan '08

I'm trying to view some websites which require Java applets to be installed in the web browser - how do I install these please as I haven't found a simple/obvious way to do it with yum? Thanks, Andy

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Xen, GFS, GNBD and DRBD?
by Tom Lanyon 03 Jan '08

03 Jan '08

Hi all, We're looking at deploying a small Xen cluster to run some of our smaller applications. I'm curious to get the lists opinions and advice on what's needed. The plan at the moment is to have two or three servers running as the Xen dom0 hosts and two servers running as storage servers. As we're trying to do this on a small scale, there is no means to hook the system into our SAN, so the storage servers do not have a shared storage subsystem. Is it possible to run DRBD on the two storage servers and then export the block devices over the network to the xen hosts? Ideally the goal is to have the effect of shared storage on the xen hosts so that domains can be migrated between them in case one server needs to go offline. Do I run GFS on top of the DRBD mirrored device, exported via GNBD to the xen hosts; or the other way around, using GNBD to export the DRBD mirrored device and then GFS running on the xen hosts? Is this possible; is there an easier/simpler/better way to do it? Thanks, Tom

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Re: [CentOS] Xen, GFS, GNBD and DRBD?
by Ross S. W. Walker 03 Jan '08

03 Jan '08

Take a look at iSCSI for the storage servers. iSCSI Enterprise Target is what I use here and it works well for us. You don't really need shared filesystems if you are doing direct block io to LVs or raw partitions as the Xen migration will handle the hand-off, but you will if you are using flat files, because of this I recommend using LVs or raw partitions as clustered filesystems will put a serious overhead on the Xen guest io. -Ross -----Original Message----- From: centos-bounces(a)centos.org <centos-bounces(a)centos.org> To: CentOS mailing list <centos(a)centos.org> Sent: Wed Jan 02 17:44:19 2008 Subject: [CentOS] Xen, GFS, GNBD and DRBD? Hi all, We're looking at deploying a small Xen cluster to run some of our smaller applications. I'm curious to get the lists opinions and advice on what's needed. The plan at the moment is to have two or three servers running as the Xen dom0 hosts and two servers running as storage servers. As we're trying to do this on a small scale, there is no means to hook the system into our SAN, so the storage servers do not have a shared storage subsystem. Is it possible to run DRBD on the two storage servers and then export the block devices over the network to the xen hosts? Ideally the goal is to have the effect of shared storage on the xen hosts so that domains can be migrated between them in case one server needs to go offline. Do I run GFS on top of the DRBD mirrored device, exported via GNBD to the xen hosts; or the other way around, using GNBD to export the DRBD mirrored device and then GFS running on the xen hosts? Is this possible; is there an easier/simpler/better way to do it? Thanks, Tom _______________________________________________ CentOS mailing list CentOS(a)centos.org http://lists.centos.org/mailman/listinfo/centos ______________________________________________________________________ This e-mail, and any attachments thereto, is intended only for use by the addressee(s) named herein and may contain legally privileged and/or confidential information. If you are not the intended recipient of this e-mail, you are hereby notified that any dissemination, distribution or copying of this e-mail, and any attachments thereto, is strictly prohibited. If you have received this e-mail in error, please immediately notify the sender and permanently delete the original and any copy or printout thereof.

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vncserver
by Jerry Geis 03 Jan '08

03 Jan '08

Hi all, When using the "vncserver :1" and then "vncviewer :1" to see it so far so good. then when I run a program I get the window outline until I move to the position I want and click - how can I just skip that step and lets say have my new program go full screen (in the vnc window). Is that possible and how? THanks, Jerry

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gettext does not work after glibc update
by Christoph Mitasch 02 Jan '08

02 Jan '08

Hi, I recently upgraded my system to CentOS 4.6 and noticed that gettext does not behave as before the update. As soon as I install the old glibc version (glibc-2.3.4-2.36) instead of the new one (glibc-2.3.4-2.39) it works again. See the Attachment for details. Any hints would be appreciated! Thank you, Christoph

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Regd: CentOS 4.4 Installtion Screen Shots
by Balaji 02 Jan '08

02 Jan '08

Dear All, I need CentOS 4.4 Step-by-Step Installation Screen Shots. Please send me the following Installation Screen Shots Details or link Regards -S.Balaji

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cron clarification
by Joseph L. Casale 02 Jan '08

02 Jan '08

What is the ramifications to simply placing scripts in the /etc/cron.hourly directory as opposed to actually adding jobs via the crontab -e method? Is there any significance to using one method versus the other? Thanks! jlc

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Firewall frustration
by Robert Moskowitz 01 Jan '08

01 Jan '08

Well FWbuilder is NOT easy. The documentation does not match the current GUI. Now the box is locked up. I will have to pull it again, hook it up to a kybd/VGA and reset iptables.... Maybe Shoreline with webmin.... Problem is I want a REAL router/firewall with little work. Both public and private nets have routable addresses. No NATing for me! I just help write the RFC ;) And all the templates for fwbuilder want you to be using NATing. Perhaps I should just set up another Astaro firewall. I have been using Astaro since v3, so I am comfortable with it....

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drbd on CentOS 5
by Kanwar Ranbir Sandhu 01 Jan '08

01 Jan '08

Hi All, Is the centosplus kernel still needed for drbd support? I noticed that if I do a 'yum update kmod-drbd', yum gives me an error because it wants to install the "normal" CentOS kernel, but can't since I have it excluded. I do see kmod-drbd in the centosplus repo though. Regards, Ranbir -- Kanwar Ranbir Sandhu Linux 2.6.22.9-61.fc6 i686 GNU/Linux 15:12:04 up 21 days, 13:43, 1 user, load average: 0.72, 0.85, 0.94

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Discuss January 2008