Discuss June 2005

discuss@lists.centos.org

197 participants
362 discussions

DHCPd Config
by Joao Medeiros 07 Jul '05

07 Jul '05

I've read a number of articles, googled the web for a few months and now attempting at turning my CentOS box into a gateway for the third time. Configured my dhcpd.conf and other related files and all seems to be working, I can have my M$ desktop leasing an ip address and all. The problem is when I want to go out to the internet I keep on getting the Request Timed out error. I'm pretty sure I've followed the manuals to the letter. The hardware is working fine. Any clues or pointers would be very much appreciated. TIA, Joao

11 19

Kickstart-based Install, editing comps.xml, hdlist/hdlist2
by dan.trainor 07 Jul '05

07 Jul '05

Hello, all - I've been throwing the question around on the kickstart-list for the last few days here, and can't quite get ahold of things. Please, allow me to explain. I am in the process of making a custom CentOS/RHEL kickstart install. It works well right now; however, it's a hackjob, and I am not comfortable with it as of yet. For the past few days, I've even gone as far as making a custom comps.xml file, for the purpose of the kickstart. What I'd like to do is not include any @groups or -/+files in my kickstart file; rather, I'd like to edit comps.xml's @Base and @Core so that I need nothing else in my kickstart file, except for the configuration options. I know that this isn't required, I'm just anal about the whole situation ;) This would also give me a chance to package, along with my install, newer and updated packages/RPMs so that I don't have to run an update process on the newly installed machine. My understanding is, if this is done, a new base/hdlist{2} file{s} is/are needed to be created. I've read around a bit, and apparently I'm supposed to use a tool named "genhdlist", but I've not been able to find any documentation on this tool, what exactly it does, and how exactly to use it. I'm expressing my frustration, along with many other people who have been in the same situation, as seen from the kickstart-list. I guess what I'm asking for, is if someone has ever made a completely custom kickstart install that does the following: 1) edits comps.xml to modify @base and @core 2) takes newer packages into consideration 3) compiles this information, creates new hdlist{2} reference files 4) gets the mother to work. This seemingly simple process seems to lack a bit of documentation. I ahve found sniplets all over the 'net where it would show a small process of how to get all this done, however, the author fails to document the utility or method in detail, or the process is for something totally archaic such as RH6.2. Any help would be greatly appreciated. Thanks! -dant

3 5

Opteron Mobo Suggestions
by Kirk Bocek 06 Jul '05

06 Jul '05

I've been planning to build a dual Opteron server for awhile. I'd like to get people's suggestions on a suitable motherboard. I've looked at the Tyan K8SE (S2892) and K8SRE (S2891) but would like to find more Linux-specific experiences with these boards. Some features I expect are at least 4 SATA (SATA-300?) ports, serial console support in the BIOS, USB 2.0 and IEEE-1394 ports, low-end on-board video. Anyone care to share their experiences? Kirk Bocek

4 5

Re: Hot swap CPU
by Bryan J. Smith <b.j.smith＠ieee.org> 05 Jul '05

05 Jul '05

From: Peter Arremann <loony(a)loonybin.org> > *rofl* either you forgot how damned slow a E4500 is or you never > worked with them... There is _nothing_ fast about them (see, I > learned how to use the underscore from you, aren't you happy?)... Dude, compared to modern UltraSPARC III/IV, _yes_ they _are_ slow. But there are a lot of UltraSPARC II options that are still quite viable solutions. > Oh - misquote to omit my acknowledgment of the inadequacy of my > comparison. What was the reason for you leaving off where I said > "compilers aren't a good benchmark"? :-) Are you that desperate to > win an agrument that you have to misquote me to infer that I'm > saying something else? Dude, this is _not_ about "winning an argument." It's about reminding you that "build times" are _not_ a good indictator of _server_ benchmark (please note that I said _server_). I mean, if you want to see one benchmark that Intel has _always_ lost to AMD -- and handily -- build times are it. ;-> > That's why I made the comment that you so nicely cut out :-) > Performance tuning of provisioning apps is another thing I do :-) Working > for a fortune 5 and dealing with the biggest systems that company has can > be fun... Dude, stop with the resume. The problem with pulling credentials is that someone else _always_ has more. Now stop while you _think_ you are "ahead." ;-> > 4TB databases, used by Java and C++ programs, 48way 96GB > ram... that a better example or still too small for you to accept that > I might not just do little things? Once again, I will re-iterate, there are _other_ performance considerations than computational. And even then, "build" times are _not_ very representative of performance in even some computational > An Athlon64 3200+/4GB running on a 3ware controller with mirrored > disks beats an 8way E4500/4GB running a 400GB oracle database... > give the sun box 8GB and the performance is roughly equal... Depends on if you are computationally limited, and also what is your I/O -- let alone the number of sessions you are serving. In raw, unthreaded, linear aspects -- hell yes, the E4500 is a _dog_. > Yes, and one of the limitations on the E4500 is throughput... > A 3510 on a v490 does 61MB/sec - same lun, just connected into the > SUNW,socal of a E4500 IO board does about 20MB/sec... It all depends on how distributed your environment works, as well as the application. I'm not saying an old UltraSPARC II platform is always going to be faster. But man, you are like a single track that thinks there are _no_ other considerations. -- Bryan J. Smith mailto:b.j.smith@ieee.org

13 26

What do you think about this motherboard?
by Juan Carlos 05 Jul '05

05 Jul '05

Hello all..... I would like to know if anyone here has had good experience with this Supermicro motherboard.....http://supermicro.com/products/motherboard/P4/E7221/P8SCT.c… I am thinking about using it in an entry level mail and file server with a 3ware card and 200 GB SATA drives. Cost is a factor here otherwise I would go for an Opteron board instead. JC

5 12

Re: Directory Server for CentOS 4.1
by Bryan J. Smith <b.j.smith＠ieee.org> 03 Jul '05

03 Jul '05

From: alex(a)milivojevic.org > I'm abusing the fact that all users have accounts on one of AD domains. Ahhh, so let me get this straight ... Your users are virtual, yet they have real accounts in ADS? Is this just for LAN? Or are you an ISP/ASP? > The "Unix" services are not aware of it. They simply authenticate user > against flat userspace on LDAP server, and the LDAP/saslauthd component > is smart enough to contact appropriate AD domain. Ahhh, a very interesting setup indeed. Are you using ADS because the users are normally logging into Windows? [ And this is a LAN setup, not an ISP/ASP? ] > So, no I'm not using Kerberos as such, because in reallity the clients > users have can't use it either (reason is simple, most Windows software > don't talk neither Kerberos nor SASL - they are all username/password > based with option to pass it over SSL/TLS). Actually, that's not true. You can replaced NT's GINA with pGINA (pluggable GINA) and authenticate and setup your credentials against various authentication/directory services. Unless, of course, you are using software that absolutely requires ADS. > I'm simply abusing the fact I can authenticate against AD domain > using Kerberos as protocol. Correct. Again, I'm curious if this is because you already use ADS for other purposes? Or someone decided that ADS was "easier" to support? > So the question is. If I have user-a and user-b, where user-a exists > as principal user-1@domain-1, and user-b exists as principal user-2 > @domain-2, can I have FDS authenticate the user against appropriate > domain if passed only the "id=user-a,dc=mydomain,dc=com" or > "id=user-b,dc=mydomain,dc=com"? No SASL, no Kerberos mumbo- > jumbo all the way from the user's client software to LDAP server > (what happens between LDAP server onwards can be anything, as > long as it works). It seems so based on the page I sent you. Although I think you might have to change your string slightly. The docs explicitly stated that 1 server _can_ authenticate against _multiple_ realms. I don't see how your setup is different, except for using the MS-Kerberos protocol which has been integrated into newer Kerberos client implementations. -- Bryan J. Smith mailto:b.j.smith@ieee.org

2 1

How fouled-up can you get??
by beartooth 02 Jul '05

02 Jul '05

I subscribed, and am getting emails hand over fist. They'll bust my inbox quota if I miss a day. I went to the web site for my subscription and tried to disable delivery; I'll follow this list on gmane or not at all -- and that works with every other mailman list I've tried. It wouldn't let me -- kept reverting to the password screen; I kept giving it the password, and making the change; and next time, the change was not there -- even though my password was letting me in. I sent an email to the address specified on the subscription website, asking for help. It sent me a piece of boilerplate in reply telling me I can't post (wanna bet?) -- because I'm not subscribed! -- Beartooth Neo-Redneck, Linux Evangelist FC 1-3, YDL 4; Pine 4.63, Pan 0.14.2; Privoxy 3.0.3; Dillo 0.8.4, Opera 8.0, Firefox 1.0.3, Epiphany 1.0.4 Remember that I have little idea what I am talking about.

15 36

Installing Dag's RPMs
by dan.trainor 01 Jul '05

01 Jul '05

Hello, all - I wanted to know your guys' success rate when installing and rebuilding RPMs in CentOS (specifically 4.0) that have come from Dag's Repositories (http://dag.wieers.com/packages/). I have noticed a number of these packages stalling at various points throughout an rpmbuild process, and I can't quite get it. It looks almost as if they were all built for RHEL4.0, but if CentOS is supposed to follow so close in RHEL's footsteps, why would this be a problem? I'll give Dag an email and see if he has anything to say about that. Once I get enough information, I'll just go ahead and hack up the RPMs so that they work properly on my systems - but I thought I'd ask beforehand, as to not re-invent the wheel. Thanks! -dant

7 11

Vote for CentOS - AGAIN :)
by Johnny Hughes 01 Jul '05

01 Jul '05

The preliminary round voting is completed in the "2005 Readers' Choice Awards" at Linux Journal. CentOS was nominated in the "distribution:" category along with 18 other Linux distros ... and we finished in the top 3 (along with Ubuntu and FedoraCore). Thanks to every one who voted for CentOS. I really did not expect that we would be on the final ballot, though I am honored that we are. Now, lets do it again, and shock the world :) Please go to Linux Journal and vote for CentOS !!! http://www.linuxjournal.com/article/8272

4 3

Postfix / Postini question
by Barry Brimer 01 Jul '05

01 Jul '05

I have a mail server that handles several domains. One of these domains has decided to use Postini. For those not familiar with Postini, you set your MX records to use their mail servers. They filter mail, and deliver you only the clean virus/spam free mail. The idea is to only allow incoming mail from their mail servers so spammers are unable to send to your mail server directly. This is fairly simple to do with standard restriction classes for a dedicated mail server. I am not sure how to accomplish this on a shared mail server. Ideally I would like to instruct postfix to accept mail from anywhere for all domains except one domain (the one using Postini) and only allow mail destined for that specific domain to originate from Postini's mail servers. Any ideas would be greatly appreciated. Thanks, Barry

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Discuss June 2005