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34758 discussions

Building an "instant on" X terminal
by Stephen Harris 16 Apr '10

16 Apr '10

I got my hands on a HP t5720. This was designed as a thin-client workstation (originally Windows XPembedded, talking to a Windows terminal server). It's not very powerful, with an AMD Geode NX 1500 (1.0 GHz), 256Mb RAM (16MB used for video) and a 512Mb flash "hard disk". I plugged in a USB DVD drive and was able to boot "linux rescue" from a C5.4 32bit disk, and it basically looks like pretty generic PC hardware. So I thought this would be a great device to build as an "instant on" type device. Well, as close to instant-on as possible :-) This probably means a standard C5 build is not suitable (too many processes running; would take a while to start up). So an "X terminal", maybe. I look at the LTSP code base, but this looks like it wants to run as it's own OS; I already have a C5 server in my house, I don't want to build another one (not even as a virtual image). Acting as an X terminal, I'd guess the 256Mb RAM should be sufficient; it won't be processing much beyond the display locally (although I might want to enable ssh and add a locally connected printer). The root disk could be local (512Mb flash) or by NFS. What do people recommend for building this? What would have the quickest power-on-to-ready time? -- rgds Stephen

11 21

memory leak observed with valgrind on CentOS release 5.4 (Final)
by Jai Prakash 16 Apr '10

16 Apr '10

Hi All, Not sure exactly a memory leak or not. I was porting my nagios from Redhat 7.3 to CentOS 5.4 and I observed the memory usage was gradually increasing on the new centos box. When I ran all my perl plugins with Valgrind -3.2.1, all the plugins complained about a memory leak. Not sure if it's a leak or if its fault with valgrind way of evaluating things. I have attached valgrind output when i ran a simple hello-world.pl on my centos box. I shall greatly appreciate if anyone have faced similar behaviour. Thanks, Jai Prakash

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Viewing the NTP Server configured
by Jatin Davey 16 Apr '10

16 Apr '10

How do i know which NTP server is my linux box contacting to synchronize its time with that of the server ? Thanks Jatin

5 5

How Do I ...
by gene.poole＠macys.com 16 Apr '10

16 Apr '10

All, I've got a machine running CentOS 5.3 and this machine has got 2 - built-in 1 Gig NICs and a expansion card with 4 - 100 Meg NICs. For whatever reason at install time, it made the expansion card eth0 through eth3 and the internal ports eth4 and eth5. And by default the 'machine' is known on the network by the eth0 NIC, so my throughput is limited to 100 Mb. How can I force the internal NICs to be eth0 and eth1? Thanks, Gene Poole

11 18

Re: [CentOS] timeout problem
by tony.chamberlain＠lemko.com 15 Apr '10

15 Apr '10

Oh, static IP on the computer. Yeah, already did that to no avail. -----Original Message----- Message: 7 Date: Wed, 14 Apr 2010 13:08:16 -0400 From: JohnS <jses27(a)gmail.com> Subject: Re: [CentOS] timeout problem To: CentOS mailing list <centos(a)centos.org> Message-ID: <1271264896.3366.23.camel@ethies> Content-Type: text/plain On Wed, 2010-04-14 at 16:23 +0000, tony.chamberlain(a)lemko.com wrote: > I found the response below today online to a question I had. > For some reason I never got the mail. I am not quite clear > on what "DHCP + DFG + 2DNS entries" means when calculating the IP > to set for the router: > > Thanks > > Re: [CentOS] Yum/WGET/HTTP sourceforge etc. new > April 12, 2010 08:10AM > On Sun, 2010-04-11 at 22:57 +0000, tony.chamberlain(a)lemko.com wrote: > > > Here is what I tried. When I put the machine directly on an AT&T IP connection (12.147.X.Y) everything worked fine. > > Same with Comcast on a direct link. The times I am having problems is when our router is hooked up to a Comcast > > IP (70.88.X.Y) and assigns 192.168.5.X addresses to our machines. So when I was doing the above from 192.168.5.27 > > going through the router through Comcast is when I had the problem. > > > --- > Try this: > For the NIC on your Comcast router set its ip to one that the dhcp in > the router gives out + DFG + 2 DNS entries. In order to have it static. > I see lots of routers with your problem. > > John --- DFG = default gateway 2DNS = primary and secondary dns server addresses DHCP = Would be your normal assigned ip address from the router on the nic card that the comcast router hands out. So now you pick one ip address the router assigns from it's dhcp address block and create a static ip configuration for your eth0 nic, If the routers dhcp address block is 192.168.2.2 - 192.168.2.100 pick 192.168.2.10 for the ip. Now eth0 needs a default gateway which is your routers address maybe like 192.168.2.1. Now eth0 needs a primary and secondary DNS entry. If the isp only has one then use one else you can use the default gateway address of the router but not recomended because you are having problems so I think you need the real dns. If you log into the router you will see or find the dns entries you need and the dhcp block that is assigned. John

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Re: [CentOS] Cloud on CentOS
by CList 15 Apr '10

15 Apr '10

> For what its worth...I do a little cloud-y type stuff at home. Mostly > spinning up VMs using KOAN/Cobbler and configuration with Puppet. Is that > the kind of thing you are interested in? I am deploying an application for about 200 locations, and I think cloud is what I am looking for

2 1

Power consumption monitoring
by Mathieu Baudier 15 Apr '10

15 Apr '10

Hi, I have quite a few low-end development/test servers running continuously and I would like to better manage their power consumption. I have found interesting information on how to perform CPU scaling (e.g. [1] or [2]). But I cannot find if there is a way to (software) monitor power consumption on CentOS (or other such data like CPU temperature, fan speed etc.). What I read so far is that support is quite limited in this kernel (e.g. PowerTop not providing useful information). Before I start tuning I would like to be able to measure whether my changes are having any impact at all. Thanks in advance, Mathieu [1] http://www.lesswatts.org/tips/cpu.php [2] http://www.spencerstirling.com/computergeek/powersaving.html

3 2

Cloud on CentOS
by CList 15 Apr '10

15 Apr '10

Hi, Is there any tutorial/implementation cloud on CentOS? Or anyone with experience like to share? Regards and thanks wL

5 6

Slightly OT: which hardware for CentOS file server (Samba, 2 To storage, 50 users)?
by Niki Kovacs 15 Apr '10

15 Apr '10

Hi, The language lab from the local university has contacted me. They'd like to have a low-cost file server for storing all their language video files. They have a mix of Windows, Mac OS X and even Linux clients, roughly 50 machines. The files are quite big, and they calculated a total amount of 2 To of storage. I'm not very proficient with hardware, meaning either I'm dealing with remote servers in some datacenter, or otherwise I install CentOS desktops on any hardware people throw at me. Since the aim is lowcost, would it be wrong to install that fileserver on a no-name desktop PC with a 64bit processor and enough RAM, and then simply put 2 x 2 To hard disks in it, either with a mirroring RAID (can never remember which does what in 0, 1 and 5) or some rsync script regularly copying over the first disk to the second? Or do you have something more apt to suggest? Cheers from South France, Niki

14 17

Getting Domainkeys, dkim, and SMTP-AUTH/TLS to play nicely together in sendmail
by Don Levey 14 Apr '10

14 Apr '10

A while back I struggled to get Domainkeys and DKIM to work properly on my little home server. While I'm sure they weren't necessary in a strict sense, it not only enabled me to learn about the technology but allowed for more of a verification of the email coming from my server. And so this week I figured: "Hey, this has been working without a problem for a while; it must be time to screw with something else." Hence my effort to enable SMTP submissions over port 587. At the very least, with some ISPs blocking traffic to port 25, this seemed to be a good idea (as well as providing a better method for sending email using my server from outside my home LAN). I've read a number of write-ups of SMTP AUTH, including the information at sendmail.org. I've run into a snag, however, with the .pem certificate that is used for the DK stuff. The conventional wisdom seems to be to run domainkeys/dkim as a user other than root, and a .pem certificate is required. Therefore, to get this to run properly, the permissions on the certificate need to me 600 or 400, owned by this user. All well and good so far, except that STARTTLS doesn't like this: STARTTLS=server: file /var/db/domainkeys/mail.key.pem unsafe: permission denied When I telnet to the server, port 587, and issue an EHLO, I see neither AUTH nor TLS in the response. The sendmail.mc file contains the line: define(`localCERT',`/ver/db/domainkeys/mail.key.pem')dnl So if there's a different line I can add to indicate to TLS/AUTH that it should use a different cert (or, rather, the same one copied to a different location with different permissions...) I don't know it. Anyone ever run into this before? -Don Levey

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