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Guidance on Linux Kernel/OS Programming for Beginners
by linux-crazy 22 Aug '10

22 Aug '10

Hi List, I am working on LINUX for the past six years , and am a core linux guys since i started my career on linux . Working more on Redhat / centos / Fedora based distribution system administration . with some basic bash scripting knowledge. Now am looking to deep dive into programming to contribute or innovate some thing new on linux operating system or kernel space (More importantly on kvm virtualization front since am an expert on virtualization). So i need your guidance to start my new career on linux programming front . As of now am planned to start with below sequences . C C++ Linux kernel Programming python Java Kindly provide me some good web links or beginner to advanced docs for the above languages to start , also correct me if am wrong any where . Awaiting for your valuable input Regards, lingu

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Guidance on Linux Kernel/OS Programming for Beginners
by linux-crazy 22 Aug '10

22 Aug '10

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securing a remotely hosted machine
by Karanbir Singh 22 Aug '10

22 Aug '10

Hi, I'm looking to put together a doc for the wiki.c.o on howto secure a remotely hosted machine. Its a situation that many of us find ourselves in, wherein we either lease or colo a server ( or many ) and there is always the issue of remote hands, other facility users etc being able to get physical access of the machines. So what are the usual steps that people take in order to secure their remote-hosted-servers. A short list of things that I tend to always do is : - disable all getty's - make grub boot imediately with no user interrupt possible - put sensitive data on a locally encrypted disk - plumb in a bios password - have all console redirected to a iLo / drac / ipmi2 device; if there is one of those - if not then redirect the output to a non-existing ttySX port ( isnt ideal! ) - disable all telnet and http/https access to the ilo / drac interfaces, ensure impi is secured. What other, reasonable, steps should one consider ? the end result, ofcourse, is to still have the option of handing passwords etc to the DC ops should there be a need to actually work on the machine remotely. so removing the keyb and display interfaces might not be desirable. - KB

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Re: [CentOS] how to check the number of thread on apache server
by Chuck Munro 22 Aug '10

22 Aug '10

> Subject: Re: [CentOS] how to check the number of thread on apache > server > To: CentOS mailing list<centos(a)centos.org> > Message-ID: > <AANLkTi=5hQOOw3t2qgD9-HLH6XNC+F8OZtHc5HPxNsLS(a)mail.gmail.com> > Content-Type: text/plain; charset=ISO-8859-1 > > On Fri, Aug 20, 2010 at 7:02 PM, Kwan Lowe<kwan.lowe(a)gmail.com> wrote: > >> On Fri, Aug 20, 2010 at 1:57 PM, Agnello George >> <agnello.dsouza(a)gmail.com> wrote: >> >>> how to check the number of thread? on my ? Apache server? ,? is there a >>> specific command , and how do i increase these threads .. >>> >>> > If you are talking about worker threads. Turn on server-status in the > httpd.conf (make sure security is set correctly), and check > http://serverip/server-status. > Slightly OT .... FWIW .... One quick-and-dirty way to check threads for any process is to use the ncurses-based 'htop' utility. I much prefer this to 'top' for several reasons, including its ability to hide/display kernel threads, hide/display user threads (in a different color if you like), display with vertical and horizontal scrolling, assign processor affinity on the fly, ptrace/strace processes, and a lot more. It's in Dag Wieers' rpmforge repository for CentOS. The suggestions offered in this discussion are all very useful with regard to tuning Apache. Chuck

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how to check the number of thread on apache server
by Agnello George 22 Aug '10

22 Aug '10

how to check the number of thread on my Apache server , is there a specific command , and how do i increase these threads .. -- Regards Agnello D'souza

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Install CentOS with degraded raid
by Daniel Bareiro 21 Aug '10

21 Aug '10

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi all! I'm making a text mode installation of CentOS 5.5 on a single disk on which I intend to put a software RAID-1 degraded, thinking of adding another disk later on. But if I try to make the installation in a RAID-1 with a single disk, the system does not allow it. There is any way to do it? Thanks in advance for your replies. Regards, Daniel -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) iEYEARECAAYFAkxtmTAACgkQZpa/GxTmHTeoZACePFQ5FYVrQZkbqRUsVwXHJ073 rlYAn2UNupZ24wHd0AfsPwRoXsZbcQuM =cTyl -----END PGP SIGNATURE-----

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dual heads, Radeon
by m.roth＠5-cent.us 21 Aug '10

21 Aug '10

Dell OptiPlex 980, Radeon HD 4550 xorg figures it should use the r500 driver. I start with no /etc/X11/xorg.conf. It comes up, mirroring. I use the gnome applet - the same thing, btw, with system-config-display - tell it to use dual head, and spanning desktops. Exit X. Restart, and the second monitor goes into powersave mode. Try to exit X, either via logout, or <ctrl><alt><bkspace>, and it goes, and comes back with a bluish screen... and that's all she wrote. It's hung so hard I can't log in via ssh, and have to power cycle it. Any clues? mark

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The system is pseudo dead when hang-up system in the centos 5.3 .
by ganu MailList 21 Aug '10

21 Aug '10

When I hang-up the system, then the screem is black. But the power light is brightness. and the disk light is bright sometimes. When I press any key, the screem is still black. Only can do is to press down power button for several seconds to power off the notebook. Is there the bug of the Centos?

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Load at 5, no CPU I/O or swap in use
by Ed Donahue 20 Aug '10

20 Aug '10

We are currently running CentOS 5 update 4 on a Dell R910 server 16 cores/32 hyperthreaded with 64GB of memory. It is our main Oracle 11g DB server for one of our customers and is attached to an MD 3000 storage array. We are having a load averaging around 5 but see no swap in use, CPUs are pretty much idle and no I/O wait. We have Oracle dataguard turned on in transactional mode. I've checked everything that I can think of, there are no Oracle processes running which would cause a spike. Anyone have any ideas as to what to check next? I have another R910 configured the same way and do not see any issues with the 3 databases running on that server. The load is at .5.

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CentOS 4 Kernel Update
by Ramon Nieto 20 Aug '10

20 Aug '10

When this kernel update be released for CentOS 4? http://rhn.redhat.com/errata/RHSA-2010-0606.html Thank you.

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