How to update/install glibc-2.14 on centos 6.x

Update reason:

  check installed glibc version:

  I have tried update glibc like below:

but didn’t work, so tried the solution like below steps: download glibc-2.14.tar.gz extract the download files and build, install in /opt/glibc-2.14:

  update glibc symbolic links:

  If you want restore glibc symbolic links :



How to find files created on a specific date?

1.How to find files modified / created /  accessed  on a specific date Example 1: find files modified on the 10th of December

Example 2: find files created on the 10th of December

Example 3: find files accessed on the 10th of December

  2.Then how to use find to delete the files found above



How to use iptables to defend against reflection DDOS attack on Centos

Usually use iptables to drop the UDP fragmented packets, below is the iptables config example: vi /etc/sysconfig/iptables

  Reference: 1 HOW TO DEFEND AGAINST AMPLIFIED REFLECTION DDOS ATTACKS 2 DDoS attacks – an explanation of amplified reflective UDP-based attacks


How to disable DST (Daylight Saving Time) in Linux

As you know, Europe area has daylight saving time (summer time). DST will change the Linux server’s time automatically, so some system will become stranger under DST. Here is an example to change Europe/London time to UTC time (because there is no DST in UTC time) to disable the DST. Confirm the system date