Kernel Caching problem
location: linux.com - date: February 19, 2011
We have developed an application in the MATLAB environment to apply statistical analysis to large ( ie: 200+ GB ) data sets. This application is a freely distributed research tool in the neuroscience field.
We have encountered a problem with the Linux ( and Mac ) kernel caching capacity. In the MATLAB environment, prior to allocating memory in variable space, the application determines if there is sufficient contiguous available memory, and returns an error if not. To ensure safety, only available memory is checked, and the kernel cache, though available, is disregarded.
During several phases of the processing, data is read from and written to disk multiple times. This consumes the kernel cache at an average rate of 500MB per operation, and quickly caches 20+GB on my test workstation, causing the application to return an 'out of memory' error (even though the cached memory is still available).
While I have operated in the past using various cache clearing operations ( such as sudo
How to use Linux DNS Server for windows machines
location: ubuntuforums.com - date: October 16, 2011
My situation is like this:
I'm using Windows XP
I installed VMBox and a Virtual Machine which is an Ubuntu Server
On Ubuntu Server, I installed Apache and Bind9. I also changed /etc/resolv.conf to use the DNS installed.
On Ubuntu Server, I can ping 192.168.56.102(ubuntu server)
On my windows XP, I can open web browser at http://192.168.56.102
But I can't use http://example.com (which was configured in Bind 9 to point to 192.168.56.102)
Can someone help me please?
DNS poissoning MyFamiliy.com (I tought no one can do this to linux)
location: ubuntuforums.com - date: July 25, 2009
Hi early this morning, while i was trying to open www.kubuntu.com, something strange.. my browser didn't view my desire page, instead of viewing a pages titled MyFamily.com
I try ubuntuforums.org (it works) , but www.coldplay.com also drives to MyFamily.com
some sites work, but many failed.
googling around, i found that it's DNS poisoning problem. a solution is doing cache flush..
unfortunately, i dont know how to cache flush in linux. I've tried to flush my iptables by typing
sudo iptables --flush
but the problem persist.
This is really annoying.. why this MyFamily.com do this?
DNS Settings Deleted Every Time I Reboot
- date: October 18, 2011
So I did a fresh install of 11.10 Ubuntu today and I made sure I configured /etc/resolv.conf so that my DNS information is correct. My system is running a static I.P. address as shown below:
:~$ cat /etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
# The loopback network interface
iface lo inet loopback
# The primary network interface
iface eth0 inet static
# dns-* options are implemented by the resolvconf package, if installed
Now also I configured my /etc/resolv.conf:
:~$ cat /etc/resolv.conf
# Generated by NetworkManager
Now everytime I reboot my machine, the info from /etc/resolv.conf is
DNS not resolving, Ubuntu 10.04 VmWare Player 4.0
location: ubuntuforums.com - date: October 15, 2011
I am new to Linux and these forums, but I like to think I'm fairly good with computers in general. Anyway, I made an Ubuntu 10.04 VM using VMWare 4.0 (most recent version), and I can connect to the network just fine.
I am able to ping my windows box (which the vm is on) as well as the gateway from the VM, and visa-versa. I am also able to ping ip addresses outside of my network (i.e. google's ip address, newegg's ip address, etc.). I am unable to ping any server names, however, such as google.com or newegg.com.
Using NAT as the network interface for the VM works just fine, but that uses my windows IP to connect, rather than being a separate host altogether. I would rather use bridged, which connects it directly to the physical network with its own IP and MAC and such.
I have tried editing the /etc/resolv.conf to include both the dns server in my windows' ipconfig /all as well as the two dns servers my router lists in its settings -- no go.
I've also tried using a static
Flush DNS in CentOS
location: linuxquestions.com - date: December 20, 2009
I use "ipconfig /flushdns" in Windows to flush DNS. I wonder what is the equivalent of this command in CentOS.
how to flush dns cache
location: linuxquestions.com - date: October 18, 2011
can anyone tell me the command to flush dns cache?
Howto flush dns cache
location: linuxquestions.com - date: May 9, 2010
I have a website that has been migrated to a new server. After a few days I'm still pointing at the old server and the hosting company have recommended that I flush my dns cache. A quick google for this in linux seemed to recommend restarting the nscd daemon but nscd -g tells me it's not running anyway. I connect to Virginmedia via wired ethernet to a Belkin N1 router so is there a way I can do this I wonder, either via Virginmedia or Slackware?
Avoid DNS Cache flush Reboot
location: linuxquestions.com - date: October 21, 2010
I need some idea to store the dns cache over the reboot in linux(which should not flush the dns cache on reboot). As am newbie to linux, Can anybody please throw some idea on this. Any help is appreciated.
location: linuxquestions.com - date: December 7, 2012
Wondering if there is a way I can give a user privileages to run DNS flush on a linux system, running Sles 11?
Page: 1 2 3 4 5 6 7 8 9 10