Server Buddies
Server Buddies info@serverbuddies.com Server Management LiveZilla Live Help
English
Eng
Server Management Spanish
Spa
Providing Dedicated Server Solutions Just a Click AWAY
Home
Services
Order
Support
News
Contact Us
About Us
server management Server Tweaking Server Monitoring HelpDesk Support Security Audit
Empty
Cpanel Support
Plesk Support
Ensim Support
Webmin Support
Directadmin Support
Empty
We Accept
We accept Visa, Mastercard, Discover and American Express credit cards.
Paypal is also accepted. The email address to use to make PayPal payment to us is:
order@serverbuddies.com
Paypal Accepted Paypal Accepted
2Checkout Accepted
30-Day MoneyBack Guarantee!


Empty
Testimonials
Our database server was corrupting tables every hour and I had multiple other admins look into the issue but only serverbuddies technicians were have to resolve it. They worked arround the clock until it was fixed.
MDofPC LLC.
See more reviews
Empty
News

Random CPU overload and freezes - Leap second

07-03-2012

Yesterday, we have found an insane cpu overload generated from nowhere on several machines we manage, this was related to The leap second that was inserted on Saturday night, this can cause permanent high CPU loads on Linux computers (Debian and CentOS/RHEL mainly). Among other examples, the behaviour is documented in the blog of the Mozilla Foundation, where strange peak loads on one Mozilla server were observed from the time the leap second was added.

A quick fix to solve this is by performig a quick reboot of the server (Notice that rebooting server services such as httpd, mysqld, even tomcat will not work). If you found a reboot it is impossible because of downtime issues, you can solve the issue by stopping the NTP daemon and executing a Perl script that reset the leap second bit in the kernel, the perl script can be found on the following article,

 http://my.opera.com/marcomarongiu/blog/2012/06/01/an-humble-attempt-to-work-around-the-leap-second

The root of the behaviour is located in the Linux kernel, where a leap second that is triggered by the NTP subsystem results in a deadlock situation. The problem appears to affect all kernel versions from 2.6.26 up to and including 3.3.

A further topic discussion concerning this behaviour can be followed on the link below,

 http://serverfault.com/questions/403732/anyone-else-experiencing-high-rates-of-linux-server-crashes-during-a-leap-second

Should you require further support to patch/upgrade your kernel or solve this issue, please submit a Hour of Support,

http://www.serverbuddies.com/hour-server-support.php
Remember, we listen to you! Any comments/suggestions should be sent to info@serverbuddies.com.

 
RedHat Support Debian Support Gentoo Linux Support FreeBSD Support Fedora Support Ubuntu Support CentOS Support SuSe Support
Home | Services | Order | Support | News | About Us | Contact | Site Map | Refund & Privacy Policy | Blog