Discuss January 2009

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272 participants
261 discussions

time command with options
by Jerry Geis 14 Jan '09

14 Jan '09

I am trying to get timing paramters from a CGI program. date is just a command for example used here. when I do: time { date; } everything is good. when I do: time -o file { date; } I get time -o file { date; } bash: syntax error near unexpected token `}' How do I correctly issue the command with an option for -o file to output the data to a file. Thanks, Jerry

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acroread = resource hog
by Ed Donahue 14 Jan '09

14 Jan '09

Any have trouble with acroread taking up massive cpu and memory? I exited my Firefox browser and the lil bastard was still hogging up my resources. Took up 69% of 4GB, and wouldn't let go, until a kill -9 showed'em, have to do it every time I open a pdf in firefox. Any use Xpdf or something else?

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gcc 4.1 and OpenMP?
by Davide Cittaro 13 Jan '09

13 Jan '09

I was modifying a source to add OpenMP capabilities. I knew that gcc supports OpenMP since version 4.2, so I've compiled a recent (4.3.2) gcc and installed in my home directory, this because gcc shipped with CentOS 5.2 is 4.1. I've then noticed that my executable links /usr/lib64/libgomp.so, installed with gcc 4.1 from CentOS rpms... Is CentOS default compiler OpenMP ready? Does this mean I don't have to compile my own compiler? Thanks d Davide Cittaro davide.cittaro(a)ifom-ieo-campus.it

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Re: [CentOS] [OT] Remote control of a WinXP machine from a Linux host
by Marko Vojinovic 13 Jan '09

13 Jan '09

On Monday 12 January 2009 09:01, Sorin Srbu wrote: > >> ssh -L 3390:private-ip-of-remote-XP-machine:3389 > >> username@ip-or-hostname-of-remote-NAT-server > > > >Well, first, private-ip-of-remote-XP-machine is dynamic, given by my ISP's > >dhcp server, so I cannot have 100% guarantee that it will always be the > > same. And I have no easy way of finding it out if it does change. > > Can't you use one of those free dyndns-thingies? That way you'd always > connect to my.homecomputer.com (or something) instead of an arbitrary ip. Umm, no, not when my IP address is 10.0.1.2.3 or such --- it is not publicly visible, so dns is useless. Best, :-) Marko

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Re: [CentOS] [OT] Remote control of a WinXP machine from a Linux host
by Marko Vojinovic 13 Jan '09

13 Jan '09

On Saturday 10 January 2009 22:48, you wrote: > I am confused by your description. Do you mean you have Machine A and > Machine B and you want to be able to access both of them at any time > over the next three years from Machine C but you could be behind a > firewall with machine C i.e. I assume you will be traveling and that's > the reason so you never know what network you will be coming out of? No, the main problem is that A is behind my ISP's NAT. I want to access it from C (yes, I'll be travelling a lot and C might be just about anywhere). But the problem is that since A is behind a NAT, the connection must be initiated from A's side to C. Also, since C might be behind some other NAT, the connection must be initiated from C's side to A. This simply cannot work simultaneously, so I tried to make use of my public server B which can be used as a "bridge" between A and C. So, A connects to B, C connects to B, and then A and C communicate. Roughly speaking... That was my initial idea, but seems too complicated to work out, so I asked for a possible easier alternative. :-) > Or if want your own set up you could of course for example run some > sort of remote access service like VNC and just pay for a static IP > for Machine A from its ISP and set up Port Forwarding for VNC That would be the most obvious solution, if only the ISP were willing to give me a static IP. But they are not. :-( > (or if > you don't want to pay use http://www.no-ip.com/ and use their free dns > service where you can create a free dns name for use with dynamic > ip's. You just install their software on Machine A and it will login > to No-IP.info and check your ip is still current and if not update it > like if your IP changes because your dsl line drops for a minute and > you get a knew ip?). Hmmm... This is interesting. I'll look up to www.no-ip.com, but I think that such dns trick may work only with public IP numbers. And A's IP is of type 10.0.*.* which is a no-go, afaik. However, I might ask the ISP to provide me with a public IP. It could still be dynamic, but public rather than local, and in that case the trick with the dns just might work... ;-) Thanks for the pointer! Best, :-) Marko

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Bugs in yum update
by Mike -- EMAIL IGNORED 13 Jan '09

13 Jan '09

This is a continuation of the thread: "yum update fails: CentOS 5.2". I installed a fresh Centos 5.2 and ran yum update. It ran correctly, except for these issues: 1. As previously mentioned, after deciding what it is going to do, It doesn't ask if its ok. But if I type y<enter> it reports: Is this ok [y/N]: Downloading Packages: 2. During the long period it is downloading files, it doesn't print anything, giving the impression that nothing is happening. Watching the lights, and using WireShark and ARIN, I determined that it was downloading from the Rochester Institute of Technology. I decided that was good. During the install phase, the expected logging appeared. 3. When it said it was finished, it didn't exit the yum process; I did it with CRTL-C . Mike.

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[OT] Remote control of a WinXP machine from a Linux host
by Marko Vojinovic 13 Jan '09

13 Jan '09

Sorry for an off topic post, but a lot of you folks are sysadmins here or there, and just might have a suggestion... ;-) I have a WinXP machine that is to be unattended for a period of 3 years (yes, I know, it sounds ridiculous, but still...). What I need is remote access to it to perform regular system maintenance, virus cleanups, occasional software installations, reboots, config changes, etc. Of course, rdesktop would do it, or vnc server or something else. The problem is that this machine is behind a NAT, and I cannot access it remotely from outside (and I need access from whereever on the planet I may happen to be). Basically, I need to setup some type of ssh tunnelling from XP (machine A) to my static-IP-24/7-high-bandwidth-CentOS server (machine B) and then further to my laptop (machine C, Fedora 10) located elsewhere (possibly behind another NAT, I can't know in advance). I have root access for all three machines (A, B and C). Of course, all three are on different LANs. However, I have never done anything like this before, so I wonder what is the best method of creating such a setup? One of my ideas was to make some script on A which would connect to B once every 15 minutes or so, look for a flagfile, and if present, initiate connection with C directly or through B if necessary. That means, if I want access from C to A, I ssh from C to B and create a flagfile, wait 15 minutes or so, and a rdesktop (or vnc or other) appears on my laptop. In theory. Or is there some other XP-tool that might do what I want out of the box? However, it need be absolutely automatic, there will be nobody around to do anything locally on A once I leave it. Another idea I had was to have machine A running as a virtual machine on a CentOS host (vmware or such would suffice). Then I could easily configure the above A-to-B-to-C scenario, shutdown the virtual A, pull its hard disk file to C, start it locally, perform maintenance, push it back to host A and run it again as a vm. But this is highly complicated, takes too much time and bandwidth, so I hope something simpler is available. Yet another idea is to ask A's ISP to provide a static IP for that machine, or to forward some available port to A, which could be used by rdesktop in some customized fashion. But the ISP may refuse such requests, and I need a robust solution. Yet even another idea is to put another CentOS machine (D) between A and A's ISP (create a local LAN). Then initiate ssh -X connection from C to D (somehow, via flagfile scenario or such), and then rdesktop from D to A over a local LAN. The main problem is NAT, if machine A had a world-accessible IP, I would just rdesktop from C to A, but alas, it doesn't... :-( Any suggestions about the best way of doing this? Thanks, :-) Marko

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webmail question
by chloe K 13 Jan '09

13 Jan '09

Hi I am using squirrel webmail and the impa sometimes is timeout What should I increase the performance? Thank you --------------------------------- Yahoo! Canada Toolbar : Search from anywhere on the web and bookmark your favourite sites. Download it now!

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Re: [CentOS] SOVLED Can sound be redirected from a remote computer to local computer?
by dcw 13 Jan '09

13 Jan '09

On Sunday 11 January 2009 1:25 am, Brian McKerr wrote: > Try NX from nomachine.com. The Free version FreeNX is in the centos extras > repo. Had to do a second install on the remote computer (I probably did something wrong the first time) but everything that I needed to work, does work. I even have sound to my local computer from the remote computer via a windows application running with wine on the remote computer. Thanks for your recommendation. David > ----- "partha chowdhury" <kira.laucas(a)gmail.com> wrote: > > dcw wrote: > > > I need to redirect the sound from a remote Centos 5.2 computer to my > > > > local > > > > > Centos 5.2 computer. Both are i386 OS. > > > > > > Searching the web and Centos web site has indicated that it is > > > > possible but I > > > > > have not found any information about how to do it. > > > > > > I am currently using ssh and/or vnc to display the remote computer > > > > locally. At > > > > > this point, the sound is being played on the remote computer only. > > > > > > Thanks for any help, > > > David > > > _______________________________________________ > > > CentOS mailing list > > > CentOS(a)centos.org > > > http://lists.centos.org/mailman/listinfo/centos > > > > for this purpose you have to setup your local machine as a sound > > server. > > i have set up succesfully using this tutorial, > > > http://www.hackenberger.at/blog/gentoo-guides/how-to-play-sound-on-a-remo > >te-server/ > > > > my scenario : two computers on the same private network > > > > on the first computer , i copy the line export ARTS_SERVER=ip of > > second > > machine:<port> to the currently logged in user's .bashrc file. Then > > play > > any mp3 with mplayer with audio output chosen as arts. > > > > on the second machine start artsd with artsd -n -u -p 5001 option ( > > however please consider the security) and set up iptables or firewall > > to > > make the second computer to accept request from first computer on port > > 5001. > > _______________________________________________ > > CentOS mailing list > > CentOS(a)centos.org > > http://lists.centos.org/mailman/listinfo/centos > > > > -- > > This message has been scanned for viruses and > > dangerous content by MailScanner, and is > > believed to be clean. -- RD Woodyard, Inc. -------------------------------------------------------

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CentOS 4 update backlog
by Vandaman 13 Jan '09

13 Jan '09

There are security updates upstream for CentOS (4 and 5) and it looks like the CentOS 5 ones have been rebuilt and rolled out. How come the CentOS 4 branch lags behind, or are the CentOS 5 devs different from the CentOS 4 devs? If more volunteers are needed I'm sure assistance could be offered by the CentOS community. Regards, Vandaman.

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Discuss January 2009