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tools one could to use to troubleshoot for Apache
by Agnello George 23 Aug '10

23 Aug '10

Have a question , Suppose i had a client tell me that he can access the web page but it takes long time to view the pages the website is a static website ( suppose this website does not server dynamic data or does not connect to a database )... what would one check other than : the server load ( cat /proc/loadaverage ) , the Apache logs , the number of client connection ( netstat -tupln |grep :80 |wc -l ) -- how would i know if it a client side issue or a server side issue ........ -- Regards Agnello D'souza

9 8

server is extremly slugish - unable to troubleshoot..
by Roland RoLaNd 23 Aug '10

23 Aug '10

Dear all, I have a virtual machine with the following specs: Core 2 DUO 3.2 GHZ 4 GB RAM hdd: IDE 320 GB 32 bit OS: centos 5.2 I'm using it for local development with a number of Virtual hosts, and a big mysql database. the prob: At times, with no specific reason. system becomes extremly slugish. http requests takes forever to be served. Even ssh connections takes time to connect, and a simple command such as "clear" takes anywhere between 3 to 10 seconds to execute. i've checked TOP, over and over again and it's always within the following: CPU load average is max 10 % , and at that specific time it's never above 30 % RAM: swap is never used, there's always around 1.5 GB of free memory so it's not a matter of CPU nor RAM. so my next thought were that HDD is maxing out on the hosting physical server. i checked on the physical server, and HDD I/O is within normal range. and other VMs workign on the same physical server are running smoothly.. so what can i do more to troubleshoot? this is happening more than it should without any scenario in common. any advice on how to troubleshoot would be greatly appreciated... PS: any command that may show I/O in KB/MB on the HDD ?

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how to install oracle 10 on the centos?
by ganu MailList 23 Aug '10

23 Aug '10

I do know how to set the kernel parameters on the /etc/sysctl.conf file.

4 7

SDA and HDA
by Matt 22 Aug '10

22 Aug '10

With the default settings in my Supermicro motherboard CentOS calls my SATA drive /dev/hda. If in bios setup I change 'Native Mode Operation' from auto to 'Serial ATA' it boots up calling the drive /dev/sda. I keep thinking its likely better under /dev/sda not? Any problem switching it to that after install? Matt

9 17

rexec error - where are you
by aurfalien＠gmail.com 22 Aug '10

22 Aug '10

Hi all, I've a particular host on my network that when I run; rexec -l username -p password remotehost command it just hangs. When I do; rexec -a -l username -p password remotehost command i get; Where are you? If I do; rexec -l username -p password localhostname (not just localhost but its actual name) command it works. Any ideas would be very appreciated. - aurf

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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

3 2

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

22 Aug '10

1 0

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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