Discuss August 2010

discuss@lists.centos.org

250 participants
191 discussions

Re: [CentOS] System beeps in kernel 2.6.18-194
by Glenn Eychaner 31 Aug '10

31 Aug '10

On Aug 26, 2010, at 12:00 PM, centos-request(a)centos.org wrote: >> ?Is there someplace can I find *detailed* release notes on the differences between -164 and -194 kernels to help in looking for the problem, pinning it down, and submitting a patch (and/or building my own kernel), or should I just download the SRPMS and dig in? > > You can find kernel changelog diffs here (maintaind by Alan Bartlett): > > http://www.centos.toracat.org/ajb/kernel-clog-diff/ Is there any place that I can find RPM or SRPM packages for the kernels between 18-164 and 18-194 that are listed in this kernel log? It would really help narrow down the problem if I could just build each kernel version and test it; then at least I'd only have one set of differences to go through rather than 30. [Not a kernel expert, but willing to give it a solid go!] Thanks, -G. -- Glenn Eychaner (geychaner(a)lco.cl) Telescope Systems Programmer, Las Campanas Observatory

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Re: [CentOS] too many open files
by Jerry Geis 31 Aug '10

31 Aug '10

lists-centos wrote: > Is this a dedicated machine, or some type of virtual hosted > environment? > > I got this error in a (centos 4.x) virtual hosted environment > recently when I exceeded my allowed process count (I was well below > my open files limit). > > > - Richard > > > ------------ Original Message ------------ > >> Date: Thursday, August 19, 2010 01:44:47 PM -0400 >> From: Jerry Geis <geisj(a)pagestation.com> >> To: CentOS ML <centos(a)centos.org> >> Subject: [CentOS] too many open files >> >> I am getting an error about to many open files. >> I tried to "echo 500000 > /proc/sys/fs/file-max" >> The number is there now, but I continue to get the error. >> >> Is there something else to do? >> >> Jerry >> _______________________________________________ >> CentOS mailing list >> CentOS(a)centos.org >> http://lists.centos.org/mailman/listinfo/centos >> > > ------------ End Original Message ------------ > > > > seems like there is a global value (which I did above) and a process limit ulimit -a tells all limits and ulimit -n 2048 seemed to work for me. Although I had to kill hte process and restart it. Thanks, jerry

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netinstlal question
by William Warren 31 Aug '10

31 Aug '10

my church just got some ibm x335's donated. Cent 5 is only relaly dvd's. I do have a windows server using IIS for internal stuff. How would i setup a local repo for the dvd so i can point the net install iso to the windows box?

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OT: redhat training and RHES6
by Monty Shinn 31 Aug '10

31 Aug '10

Greetings. I am planning on getting my RHCE in the near future. I thinking I should wait until 6 comes out before proceeding. That being said, I don't want to wait past the end of this year. That being said, do you all have any information about how long it takes for their training platform to catch up to their release? Which is to say, if RHES 6 is released on day 1, at what point will they start training on RHES6? I'm asking here instead of RH since I want real-world answers, not the company line. Any thoughts are greatly appreciated. TIA, Monty

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Partitioning production server
by admin lewis 31 Aug '10

31 Aug '10

Hi, I have to install a production server with postgresql.. with few hundreds of MB (2-300) would u advice me to partitioning the disk ? The server will be under vmware environment with SAN as storage. -- -- Lewis

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OpenVPN throughput
by Boris Epstein 31 Aug '10

31 Aug '10

Hello listmates, We are working on setting up two private networks linked by a public network which is fast (1 Gbit/s) but potentially insecure. Since the hosts on our two networks need to talk to each other, and do so securely, we have decided to use OpenVPN to connect them, making one gateway a server and the other a client. The connectivity part was easy to establish and worked like a charm. The only problem was, and is, performance. We have two old PIII-class machines that are being tested for the role of the gateways. We have put new 1 Gbit NIC's in them and they work find for everything (data transmission, DHCP, DNS, routing) except the VPN. When traffic goes through the VPN the OpenVPN process goes to 99% CPU on the server, about 70% CPU on the client and the effective transmission rate goes down to about 6 MB/s whereas in non-VPN mode it can be as high as 50+ MB/s (the top for the 1 Gbit/s is, obviously, 125 MB/s hence with the VPN we are down to about 5% of the capacity). While this may be usable we would like to hope we can do better. Hence the following questions: 1) Have you used OpenVPN in a similar setup? 2) If so what sort of performance did you see? 3) What kind of equipment did you use? Personally, I'd like to hope that if we find VPN-enabled gateways with more processing power we'd get drastically better performance. So if you have data to confirm or deny that please share it. Thanks. Boris.

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Re: [CentOS] OpenVPN throughput
by J.Witvliet＠mindef.nl 31 Aug '10

31 Aug '10

See below... -----Original Message----- From: centos-bounces(a)centos.org [mailto:centos-bounces@centos.org] On Behalf Of Gordon Messmer Sent: Saturday, August 21, 2010 12:03 AM To: CentOS mailing list Subject: Re: [CentOS] OpenVPN throughput On 08/20/2010 10:19 AM, Bill Campbell wrote: > > Comparisons with gigabit networks seems a pointless given that most > VPNs will be used over the Internet which limits bandwidth, how fast > is fast enough? Boris said in his first email that the link between the two networks was 1 Gps. _______________________________________________ Perhaps a bit late on this thread, but i thought of adding my $0.02 ... Last year i've been doing some experiments with openvpn. Just as the O.P. I was curious about sustainable throughput, and was disapointed about the results To obtain maximum resulst, i did: - use two rather heavy machines (HP DL380-G6, dual quad core) - two dedicated 10Gb-nic's - cross-connect both nics - DISABLE openvpn-debug (as it is VERY cpu expensive) - raise MTU to 4K Bottleneck was (in my case) the openvpn-process, that was running 100% on a single core, While network was not saturated. So for max throughput, it is probably strongswan (ipsec) or hw-encryption [or both] hw ______________________________________________________________________ Dit bericht kan informatie bevatten die niet voor u is bestemd. Indien u niet de geadresseerde bent of dit bericht abusievelijk aan u is toegezonden, wordt u verzocht dat aan de afzender te melden en het bericht te verwijderen. De Staat aanvaardt geen aansprakelijkheid voor schade, van welke aard ook, die verband houdt met risico's verbonden aan het elektronisch verzenden van berichten. This message may contain information that is not intended for you. If you are not the addressee or if this message was sent to you by mistake, you are requested to inform the sender and delete the message. The State accepts no liability for damage of any kind resulting from the risks inherent in the electronic transmission of messages.

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pam changes - service restart reqd?
by Carlos S 30 Aug '10

30 Aug '10

Howdy, Do we need to restart any service after making changed to pam modules? I have changed system-auth config, but not sure if I need to restart any service after making changes, e.g. ssh which uses pam. Any help? -- Thanks, CS.

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kvm boot options
by Jerry Geis 30 Aug '10

30 Aug '10

I am trying to use -boot order=dc,once=d for kvm. It did not seem to work as it booted from CDROM (d) the second time around and was wanting to re-install centos again. 1st boot installs centos and auto reboots 2nd boot then begins OTHER things to do. Did I not have the command options correct above? Jerry

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Freezing gnome terminals...
by John Doe 30 Aug '10

30 Aug '10

Hi, just wondering if you also experience gnome terminals freezing after a while...? It mainly happens over the week-end. I would leave a terminal open (with an ssh session to a remote site), come back on monday and type a few commands and it jwould just freeze. But it also happen from time to time randomly during the day (but still with days old terminals). Happens to my collegues too. The Gnome terminal Reset option would not do anything. any idea what could be the problem? Thx, JD

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Discuss August 2010