CentOS 5 :: Maximum Requests Per Second?

Aug 6, 2009

Is there a maximum requests per second that CentOS can handle? For example, a site like wikipedia gets at least 30,000 requests per second, so could CentOS handle that many requests? Some people told me that CentOS cannot and i would need to get a custom kernel.

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CentOS 5 Networking :: DNS Requests Go To Localhost When Made By Apache / Php

Oct 7, 2009

I'm running wordpress and have gone to the painstaking effort of setting up the ftp server on my 5.3 machine so it can do its own updates and download plugins. However, I've found that if I try to download anything, I get a "unable to resolve host..." error from the script. If I watch Iptraf while making the request, I see all the port 53 requests going to Pings are too.

However, if I ssh in, I can ping and wget and whatever I want all day long and all the DNS requests to go the router (Clarkconnect 3.2 gateway machine). The web browser in the terminal works fine too. What is it about the php scripts that is causing them to misdirect pings and dns requests? I've never seen anything like it and can't find anything on the web about it either.


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CentOS 5 :: Find Out Maximum I/O Request Size?

Nov 28, 2009

How do I find out maximum I/O request size?

I'm using CentOS release 5.2

I know that the default size is 128 K, how do I find out/confirm this?

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CentOS 5 Hardware :: Maximum Number Of CPUs Supported

Oct 29, 2010

While searching for the maximum numbers of CPUs supported by CentOS 5 x86_64 I found the following page: [URL]. The question I have regarding the specified information ("64/255" logical CPUs) is, which number means what. Does this mean 64 real CPUs with a maximum of 255 cores/hyperthreaded CPUs or something similar or totally different?

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CentOS 5 Hardware :: Maximum Number Of CPUs Supported With 5 X86_64

Jan 31, 2011

While searching for the maximum numbers of CPUs supported by CentOS 5 x86_64 I found the following page: [URL] The question I have regarding the specified information ("64/255" logical CPUs) is, which number means what. Does this mean 64 real CPUs with a maximum of 255 cores/hyperthreaded CPUs or something similar or totally different?

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CentOS 5 Hardware :: Format New Hard Drive To Get The Maximum Usage?

Jun 7, 2009

I am about to purchase a new external hard drive which will be driven through the USB port. It will probably be a 1.0 TB drive from Frys/CompUSA/MicroCenter or some discount source. It will probably come formatted to run on a Windows machine and I intend this drive to be run only from my Linux laptop. I'd like to format it to be able to make the most of it from my Linux machine. Although re-formatting may not be absolutely necessary, as it probably will work "OK" just out of the box as is, how can I format it to get the maximum usage out of this new drive?

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CentOS 5 Server :: What Is The Maximum Number Of Logical Volumes In A Volume Group

May 15, 2009

what the maximum number of logical volumes is for a volume group in LVM ? Is there any known performance hit for creating a large number of small logical volumes vs a small number of large volumes ?

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CentOS 5 Server :: Home DNS Server Refuses To Answer Requests

Aug 25, 2009

I have a home DNS server that has been working for some time today. Today I restarted to restarted it to clear the cache on it and now it refuses to answer and requests. Named starts fine with no errors. Here is named config file that worked for about 2 weeks fine and now doesn't want to work.

options {
directory "/etc";
pid-file "/var/run/named/named.pid";
forwarders {;
forward only;
zone "." {
type hint;
file "/etc/db.cache";

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General :: How To Hold I/O Requests

Mar 23, 2011

I need to quiesce a VM manually and for that I need to somehow pause VM and hold incoming I/O requests.

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Server :: Forward VNC Requests From A To B?

Aug 18, 2010

I'm trying to forward VNC requests from server a to server b, acctually I need the server a to be just VNC proxy and other servers behind server a can be responsible for VNC requests.I did it with this iptables rule but it didn't workAnd for notification all VNC sessions of mine are in range of 59100 to 59199

num target prot opt source destination
1 DNAT tcp -- tcp dpts:59100:59199 to:bbb.bbb.bbb.bbb

Do you know a better way or a way to fix it with iptables?

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Server :: How Many Requests To Each Website

Aug 15, 2010

I'm just asking about a script (ex, bash script) that will let me know how many requests to each website on the server? So is there a way to get know from shell how many requests or connections to each web site on the server, in order to determine which website is under flood or DoS/DDoS attack.

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Debian :: Apache Takes Up So Much CPU For Some Of Requests?

Jul 16, 2010

Question 1: Hey. I noticed i have quite a few logs that end with .[number] for example "syslog.1" "mail.info.1" etc, why is this and why are they there since almost nothing is logged in them ??

Question 2: on my server im running a script like imagebam and imageshack with hosts images so i have quite a few apache requests to my server. I am wonder why apache takes up so much CPU for some of the requests ? in Htop some requests take up 1.2% CPU while other take up 3-5% etc, so the total load is about 1.50 0.58 0.84 to 2.61 1.08 1.14 with about 128-150 apache requests all the time while sometimes the CPU load can be almost 0 with the same ammount of requests. is this normal? what could cause this in apache ?? the server is just running apache2. MYSQL is running on another server.

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Ubuntu :: Can't Get Apache To Respond To Outside Requests

Sep 6, 2010

I've been scouring the message boards and trying different things for two days and haven't found a solution. I set up Ubuntu 10.04.1 a few days ago using the server iso and selected the LAMP installation option. I will be using it as a sandbox to try out things from a PHP/MySQL book I purchased.

I have installed Gnome since sometimes I just can't get the command prompt to let me do things and Gnome may at least tell me why. I also installed PHPMyadmin.

My problem is that I can work with this thing all I want in any way I want - HTTP, SSH, SFTP, etc. - from within my home network but Apache refuses to respond to an outside request. Since it's only a test box it usually wouldn't be that big of a deal but I am going out of town for a couple of days and would really like to start working with my new book.

I am 99% sure my ISP is not blocking any ports. I have a ComTrend ADSL modem with router. I have given my Apache server a static IP on the NAT (xxx.xxx.x.101) and set up a dyndns address so I don't have to keep remembering the IP address.

Here is what I have tried so far: Setup a virtual server (port forwarding) on the router to to direct traffic on port 80 to internal IP .101The router told me its interface is using 80 so it would move itself to 8080 Made sure to also add port trigger for port 80 Made sure to save/reset the router Used my iPhone to connect via 3G - didn't work using IP or dyndns name Used iPhone to connect to 8080 and router responded

Set port forwarding/triggering for 8080 -> 80. No joy there, either Tried changing listening port to 8000Set port forwarding and triggering to allow port 8000 Changed ports.conf to read NameVirtualHost *:8000 and Listen 8000 Changed first line of /etc/apache2/sites-enabled/000-default to <VirtualHost *:8000> Restarted Apache service

Apache responded to dyndns.com:8000 from home machine No response when trying same on iPhone (sorry, it's the easiest way for me to test from outside my home network)

At one point, I added "ServerName localhost" to the otherwise empty httpd.conf file but that didn't seem to do a darn thing.

Many of the posts I have perused are at least a couple of years old and have included information on taking action with files that are not there or are no longer where they were. I have interpolated where I can but so far nothing has worked.

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Ubuntu :: Stop The Password Requests?

Jan 26, 2011

I'm the only one who uses or has access to my computer, so I don't need the password security that others might. Frankly, it pisses me off to have to enter my password every time I leave the computer for a few minutes, or want to make the many tweaks that are necessary to get a system going, whether it's installing software or anything else. How do I stop it?

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Ubuntu :: Always Requests Password 2 Times?

Mar 28, 2011

ubuntu always requests my pass 2 times ...(in terminal, login page, security msgs ...)

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Networking :: Redirecting Ssl Requests With Squid?

Feb 24, 2010

say i have an apache server configured for ssl/non ssl virtual hosts and a proxy configured as follows (see squid.conf)the ssl on each name based virtual host is configured on its own port (only 7 of the domains need this the rest are just media and other insignificant bits of data but domains 1-7 contain forms that require specific personal information that may be technically illegal to transmit without encryption)if any additional information is needed just let me know

domain1 is port 443
domain2 is port 444
domain3 is port 445


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General :: .htaccess To Redirect All Requests To Another URL?

Apr 16, 2010

I would like to setup .htaccess to redirect every request to one website regardless of folder/filename combination to another URL.For example[URL]

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Security :: Strange Nfs Mount Requests From F14 Box?

May 28, 2011

I've lately been getting some strange nfs mount requests for non existant users' home directories on a F14 machine to my file server (CentOS).The message log on the file server shows the following

May 23 03:10:53 data mountd[4835]: can't stat exported dir /export/home/httpd: No such file or directory
May 24 03:21:13 data mountd[4835]: can't stat exported dir /export/home/httpd: No such file or directory
May 25 03:26:53 data mountd[4835]: can't stat exported dir /export/home/httpd: No such file or directory


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Server :: Tons Of NFS Mount Requests?

Mar 30, 2010

I have an nfs server that is getting tons of mount requests, and i suspect it's becoming a performance issue. Even when noone is in the office I see mount/unmount requests in my logs. Is this normal?

Mar 30 10:32:42 morgan mountd[29643]: authenticated unmount request from uranus:757 for /morgan/users (/morgan/users)


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Fedora :: Unable To See Any IGMP Requests From IP Address

May 17, 2010

I am trying to send a multicast stream out from a Windows XP computer to my FC12 computer. I am using VLC for both the stream and the receive end of the process. Its version is 1.1.0-pre1 if that helps.As of right now I've used Wireshark to detect network packets, and I am unable to see any IGMP requests from the Fedora's IP address, whereas when I try to initialize a receiving stream on my Windows XP computer, I can see IGMP packets where appropriate. So the issue clearly lies with either VLC in Fedora, or Fedora itself, but I can't figure out how to narrow it down any further.

If it helps, I AM able to stream FROM my Fedora computer TO my Windows computer. Additionally, I am UNABLE to stream from my Fedora computer back to my Fedora computer (locally), despite being able to do that on the Windows side.

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Fedora :: Way Of Altering Time Between Password Requests

Oct 26, 2010

Is there a way of altering the time between password requests. For example after I login there seems to be a certain amount of time before the screen blanks out and a new request for the user password is asked. I would like to increase the time substantially.

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OpenSUSE :: View Web Pages That Requests Silverlight?

Aug 11, 2010

Is there any possibility to view the web pages that request the installation of Microsoft Silverlight?

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Ubuntu :: Live-cd Requests Username And Password?

Feb 25, 2010

i'm trying to run ubuntu 9.10 64-bit on my 64-bit machine from a live cd, when i boot from the disk i select ENGLISH and the first option on the menu, which is try ubuntu without making any changes (or something to that effect). it then goes off to the black screen with the white ubuntu symbol, following that the brown login window appears requesting a user mane and password, now as its a live cd session i have not set a user name or password! so how do i login?

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Ubuntu Security :: Suppressing Requests For Password?

Jul 11, 2010

I use Ubuntu 10.04 and I want to be able to move around the system without having to frequently enter my password. For example, when waking up the system from a power save state or when accessing Synaptic Package Manager I do not want to be asked to enter my password. There is nothing on my system that matters if its security is breached. Is there a way to turn off these requests for a password?

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Ubuntu :: Get Two Requests For Key Chain Unlocks When Boot?

Jan 18, 2011

For some reason I get two requests for key chain unlocks when I boot? I only have to "sign" one of them but the second one still appears.

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Ubuntu Security :: Does Tor Browser Use Dns Requests From The Tor Network

Mar 1, 2011

Ok i think Tor has some way of making the dns queries anonymous by default. I did the DNS nameserver spoofablity test here at [URL] and the results i got showed about 30 different dns servers. Normally when i carry out this test on my standard isp connection or the vpn i use i just get one dns servers settings consistently.

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Networking :: HTTP Requests Always Go By TCP Connect Tunnel?

Aug 14, 2010

How do Http requests and responses go from a client to the server? IS a TCP Connect Tunnel always formed or is there some different mode ?

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Networking :: Balance The Internet Requests From LAN Using 2 Connections?

Feb 17, 2010

I have a firewall ( a pc with debian 5) with 2 internet connections. each connected to a ethernet card (the firewall has 2 ethernet pci cards so it has one connection per card)how can i balance the internet requests from my LAN using this 2 connections?

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Networking :: Forward All Http/https Requests ?

May 12, 2010

I have a server (Fedora 12) setup at a client's datacenter and the network is setup to allow me ssh access into the server, but prevents me from opening any connections from the server. However, I need to make http and https request from the server. What I'd like to do is forward all http/https traffic through another machine outside the network.

I've been looking at the documentation for ssh and the various options there and have gotten so far as to enable initiating an ssh connection from the client network back to my machine, but am not sure where to take it from there.

Here are some of the commands I've used so far:


I'm attempting to bind port 80 to be forwarded through the local machine. I assume I use "ssh -R" to create a dynamic tunnel to forward requests but I must be missing something.

By the way, root login via ssh is disabled.

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Networking :: IPTables - Inspect / Modify DNS Requests?

May 10, 2010

I'm trying to work out a way to inspect/modify dns requests as an advertising filter. Iptables is a good place to do this, but I'm having some problems disassembling the packet. On my dev box, when a DNS reply is returned from a request made on the dev box. I use this rule to route the reply packet through a queue:

iptables -A INPUT -p udp --sport 53 -j NFQUEUE --queue-num 1

Will the rule catch the inbound udp packet with the dns reply in it? I get something in the queue, but it's unintelligible when attempting to disassemble the packet. I don't want to move onto looking at my program until I get some feedback on the rule.

Here's a primitive diagram of what I'm working towards:
host ->DNS request->iptables(no outbound rules)-> DNS Server
->DNS Answer ->iptables(queue udp 53 packets)
->inspect packet program-> Allow/Deny -> host processes allowed packets

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