Linux in Supercomputers and Robotics

90% of the world's most powerful supercomputers using an operating system GNU / Linux, in fact, the top ten of supercomputers use Linux. In fact, the penetration of Linux in data centers is very high, 33.8% of the world runs on Linux servers compared to 7.3% does so in a Microsoft operating system. For example, Google's servers run on Linux, like the server hosting the website of the White House.

Linux Earlier Years

The first commercial distribution GNU / Linux was Yggdrasil was launched Lice-CD format in 1992. Red Hat was one of the first distributions to settle within companies and data centers in 1999. Debian was one of the first GNU / Linux that was constituted and organized as a community of developers.

Linux OS used in Major Applications / Services

Linux is present in highly critical applications such as Japan's bullet trains, traffic control, San Francisco, the New York Stock Exchange, CERN, many air traffic control systems or control of nuclear reactors of submarines and ships many nuclear war.

Expanding Everyday

Linux has more than 9.2 million lines of code and this amount grows 10% each year. Of the 9.2 million lines, the kernel itself accounts for 5% and 55% drivers. Add lines 4500, 1800 and 1500 are removed are changed every day.

Widely Used

Linux is now one of the most widely ported operating system kernels, running on a diverse range of systems from handheld computers to mainframe servers.

Sunday, October 26, 2014

Disabling Core Dumps in cPanel

8:17 AM Unknown No comments

I recently found a (cPanel) server was generating over 100Gb of core dumps every time a bad PHP script died or Apache died. Writing these generally useless (who actually debugs these on a live web server) to disk is a pointless waste of disk I/O, especially in a VPS environment.

Here is two methods of disabling core dumps;cPanel/WHM

  1. Login to WHM
  2. Select ‘Tweak Settings’
  3. Search for ‘core’
  4. Turn ‘Generate core dumps’ off.
Linux

 I usually do this on cPanel servers also, just to be double sure!

1. Disable core dumps for all users.
Edit /etc/security/limits.conf and check that * hard core 0 exists

2. Disable core dumps for setuid programs







echo 'fs.suid_dumpable = 0' >> /etc/sysctl.conf
sysctl -p














3. Finally, set a soft limit to stop core dumps being created













echo 'ulimit -S -c 0 > /dev/null 2>&1' >> /etc/profile







No reboot required.



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