Re: [CentOS] dhcpd rpm
-Original Message- From: Todd Denniston [mailto:todd.dennis...@tsb.cranrdte.navy.mil] Sent: Monday, October 18, 2010 10:43 AM To: CentOS mailing list Subject: Re: [CentOS] dhcpd rpm Ausmus, Matt wrote, On 10/18/2010 01:11 PM: Howdy, SNIP We’ve found the problem is generally caused by the time being out of sync between the servers or the dhcpd daemon on one of the boxes dies. NTP does not keep them closely enough synchronized? OH, and in case you were not aware of it, you could run NTP on one of them using local clock if you don't have a good trust able time server available for some reason. Also making your DHCP machines NTP peers would be good too. Or are you talking about some other type of time? -- Todd Denniston Crane Division, Naval Surface Warfare Center (NSWC Crane) Harnessing the Power of Technology for the Warfighter I think the problem we have/had was related to a Layer 8 issue. I have student workers build our DHCP servers from specifications that I give them. What more than likely happened was that dhcpdate wasn't run on the boxes when they were first built causing the date time to be off and ntpd having issues getting the time back in line. My understanding of how ntpd works is that if the time is off too much it sees the time difference as irrational and is not able to pull it back in line. Once I run ntpdate on those boxes the issues go away and ntpd is able to maintain the time sync fine. Matt Ausmus Network Administrator Chapman University Nothing is ever accomplished by a reasonable man. -Bucy’s Law ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] using a Laptop as a KVM console?
I had the same thought a couple years ago. I found a device from a company out of the UK called Epiphan. They make a small box that connects via usb 2.0 (required) and acts as a KVM. Essentially it streams across USB. They make drivers for both Windows and Mac and they have a Linux SDK but will build a Linux client for you based on the kernel you're running. They're working on having a production Linux client but it isn't there yet. I've used it for both Windows and Mac. I find connecting to a Windows server is troublesome but it works great on Linux CLI. This has become my crash cart. The company have been very aggressive developing the software for it and are very responsive to problems you encounter. We've had really good success with it. It does have a few quirks but nothing insurmountable and we're budgeting to purchase one for each admin. http://www.epiphan.com/products/other-applications/kvm2usb/ Matt Ausmus Network Administrator Chapman University 635 West Palm Street Orange, CA 92868 (714)628-2738 maus...@chapman.edu Nothing is ever accomplished by a reasonable man. -Bucy's Law -Original Message- From: Rudi Ahlers [mailto:r...@softdux.com] Sent: Wednesday, October 13, 2010 10:32 AM To: CentOS mailing list Subject: [CentOS] using a Laptop as a KVM console? Hi all, Has anyone seen something like this before: I want to use a laptop as a KVM console. Basically when a technician goes to one of our datacentres, or clients he has to look for a free LCD, keyboard mouse to connect to a server (no network access, reinstall, troubleshoot failed kernel / HDD, etc). And then hopefully there's an open power socker in that cabinet. So I'm thinking why not just use a laptop instead? It already has an LCD, keyboard, mouse power. Surely someone has, or may still, build something that could connect to the laptop's USB port(s) and then to the server's VGA USB / PS2 ports, then act as a KVM? -- Kind Regards Rudi Ahlers SoftDux Website: http://www.SoftDux.com Technical Blog: http://Blog.SoftDux.com Office: 087 805 9573 Cell: 082 554 7532 ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] dhcpd rpm
Howdy, Yeah, this issue’s been brought up in the past. One of the maintainer of FC 13 made the srpm available (I believe he prepped the spec file) for RHEL/CentOS 5 for dhcpd 4.1. We started looking at it and the problems are the dependencies and the dependencies of the dependencies. There are no srpms or rpms for those and the project becomes a real monster. We’ve found the problem is generally caused by the time being out of sync between the servers or the dhcpd daemon on one of the boxes dies. To mitigate this problem we’ve setup custom Nagios alerts which utilize dhcping to alert us when a dhcpd process dies. We’ve also setup custom scripts that will restart the dead process on the box. So, we’re just waiting for CentOS 6 to be released. Matt Ausmus Network Administrator Chapman University 635 West Palm Street Orange, CA 92868 (714)628-2738 maus...@chapman.edu mailto:maus...@chapman.edu Nothing is ever accomplished by a reasonable man. -Bucy’s Law From: Waleed Harbi [mailto:waleed.ha...@gmail.com] Sent: Thursday, October 14, 2010 1:49 PM To: CentOS mailing list Subject: Re: [CentOS] dhcpd rpm Try find-out SPEC file and rpm source, recompile it, this is the faster way I think, if you have big issue. Fedora they released 4.1, check it. http://mirrors.isu.net.sa/pub/fedora/linux/releases/13/Everything/x86_64/os/Packages/dhclient-4.1.1-15.fc13.x86_64.rpm -- Best Wishes, Waleed Harbi Dream | Do | Be On Thu, Oct 14, 2010 at 11:44 PM, m.r...@5-cent.us wrote: JohnS wrote: On Thu, 2010-10-14 at 14:58 -0400, m.r...@5-cent.us wrote: Folks, We've been having occasional issues with failover dhcpd. I went looking for peer holds all free leases, and happened to run across https://bugzilla.redhat.com/show_bug.cgi?format=multipleid=610219, which is rated important, and is supposed to be fixed in 3.0.5-24. Looking at the repo at kernel.org, all I see is what we have, dhclient-3.0.5-23.el5.x86_64.rpm. Any idea when this update will be released? --- Bother to even look on Upstreams Site? It's not freely available yet as I see it. No, I hadn't. I'm just a tad surprised - that was rated important, and looked as though it would be released soon. And with 6 coming soon, I was thinking, though I haven't gone to look, that they'd have 3.1 or 4.x. Thanks, though. mark ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] iptables
When I was first learning iptables, I found Rusty's Remarkably Unreliable Guides to be an excellent resource on how iptables works. He covers each part of iptables and does it in a clear and easy to understand manner. If I remember correctly, the guides are also entertaining. http://people.netfilter.org/~rusty/unreliable-guides/ I personally don't like any of the GUIs out there. I find them to be way to constricting compared to the sheer power and flexibility of iptables. You're better off going through the guide and googling and then just writing your rules in a text editor. Matt Ausmus Network Administrator Chapman University 635 West Palm Street Orange, CA 92868 (714)628-2738 maus...@chapman.edu Nothing is ever accomplished by a reasonable man. -Bucy's Law -Original Message- From: Robert Spangler [mailto:mli...@zoominternet.net] Sent: Friday, September 17, 2010 9:39 AM To: CentOS mailing list Subject: Re: [CentOS] iptables On Thursday 16 September 2010 16:03, alexus wrote: I'm trying to do some simple tcp port forwarding The first thing you need to do is drop the RH-firewall BS and create a new firewall rule set setup for your needs. If you don't know how to setup a firewall then I would suggest you get one of those GUI programs that can do this for you. [r...@wcmisdlin02 ~]# curl --verbose http://10.52.208.221:80 * About to connect() to 10.52.208.221 port 80 * Trying 10.52.208.221... Connection refused * couldn't connect to host * Closing connection #0 curl: (7) couldn't connect to host [r...@wcmisdlin02 ~]# Looks like this host doesn't accept port 80 connections. -- Regards Robert Linux The adventure of a life time. Linux User #296285 Get Counted http://counter.li.org/ ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] DHCP server 4.x rpm?
Hi all, Has anyone built an rpm for DHCP server 4.x for CentOS 5 or used a Fedora rpm? Anyone using dhcpd 4.x on 5.5 and can give me a heads up on any pitfalls that I need to be aware of? Thanks in advance. Matt Ausmus Network Administrator Chapman University 635 West Palm Street Orange, CA 92868 (714)628-2738 maus...@chapman.edu mailto:maus...@chapman.edu We should take care not to make the intellect our god; it has, of course, powerful muscles, but no personality. - Albert Einstein ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] best practice: how to setup a central network installation server?
If you want to invest a little extra time you can install Spacewalk (the open source version of Red Hat's Satellite) which has Cobbler built into it plus it provides centralized management of your devices both for monitoring services as well as being able to deploy config files, updates , etc. It provides a nice clean interface for Cobbler and it is fully integrated into it. Installing just Cobbler is definitely the quick way to get this going but taking the time to deploy Spacewalk (especially if you manage lots of servers) is worth the effort. We've been running it for less than a year and we're very happy with it. Matt Ausmus Network Administrator Chapman University 635 West Palm Street Orange, CA 92868 (714)628-2738 maus...@chapman.edu What the gods get away with, the cows don't. -THE AQUINAS AXIOM -Original Message- From: Fernando Gleiser [mailto:ferglei...@yahoo.com] Sent: Thursday, February 18, 2010 11:13 AM To: CentOS mailing list Subject: Re: [CentOS] best practice: how to setup a central network installation server? - Original Message From: Marcelo M. Garcia marcelo.maia.gar...@googlemail.com To: CentOS mailing list centos@centos.org Sent: Thu, February 18, 2010 7:16:45 AM Subject: Re: [CentOS] best practice: how to setup a central network installation server? Rudi Ahlers wrote: kickstart file, if you are familiar with text based configurations? Is kickstart REALLY the only way? How do I configure the server so that the client can use network boot, without a CD? Hi You can use PXE. You have to set up a tftp and a DHCP server. Sometimes you have to enable PXE in the BIOS - I always to do this with Dell machines. Install cobbler, it makes building a netinstall server as easy as 1 2 3 cobbler handles pxe, dhcp, http repo setup, kickstart and such. I've used it many times, it takes less than 15 minutes from yum install cobbler to the start of the network installs of the client machines. Once you set it up, just power on the client machine and watch it install automagically Fer ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] ntop from rpmforge
I don't know why I haven't signed up for this list before since we use CentOS all over the place. The list is very useful and it is good for me to participate and give back to the community. Anywho, I wanted to post this response to a thread that was created back in November 2008 about the ntop daemon failing to start. I'm currently setting up ntop as a NetFlow SFlow collector and came across the issue. A quick refresher, the init script for ntop has an issue where it can't parse the ntop.conf file correctly if switches are entered before the @/etc/ntop.conf. The suggested work around was to move the -d -L switches from in front of the @/etc/ntop.conf and put them behind it. This is definitely the fix. There is a caveat to that and I haven't found anyone that has mentioned it so I thought I would. According to the documentation, if you add the switches after the @/etc/ntop.conf those will override the configurations in the ntop.conf file. While this isn't an issue with the -d option, if you decide to use a custom syslog level and add it to the conf file, the -L switch after the conf file will override your custom log facility. In my init file I left the -d but removed the -L expecting me to put my own syslog entry in the conf file. Matt Ausmus Network Administrator Chapman University 635 West Palm Street Orange, CA 92868 (714)628-2738 maus...@chapman.edu mailto:maus...@chapman.edu Man will occasionally stumble over the truth, but most of the time he will pick himself up and continue on. - Churchill's Commentary on Man ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
