Tag Archives: cent os

How to install PHP 7 on Debian Linux 8.6/7.x [jessie/wheezy]

How to install PHP 7 on Debian Linux 8.6/7.x [jessie/wheezy]
I wanted to use PHP 7 on Debian 8.x. How do I install and configure PHP 7 on Debian Linux 8.x server? How do I install PHP 7 on Debian Linux 7.x “wheezy” VPS server hosted in cloud? PHP 7 is a dynamic scripting langauge for delivering applications. You can get 2x faster performance and […]
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Dyn a cloud-based DNS service under DDoS attack and took down major sites such as Twitter/Reddit/Spotify/Paypal and others

Dyn a cloud-based DNS service under DDoS attack and took down major sites such as Twitter/Reddit/Spotify/Paypal and others
DDoS on Dyn.COM

A massive DDoS (distributed denial-of-service) attack against a popular cloud-based DNS provider Dyn.COM took down major websites. The DYN.COM confirmed it on twitter:

We are aware of the ongoing service interruption of our Managed DNS network. For more information visit our status page.

— Dyn (@Dyn) October 21, 2016

Following sites are having issues due to DNS problems:

  1. Twitter
  2. SoundCloud
  3. Spotify
  4. Netflix
  5. Reddit
  6. Disqus
  7. PayPal
  8. Basecamp
  9. Business Insider
  10. CNN
  11. Esty
  12. Github
  13. Guardian.co.uk
  14. Imgur
  15. HBO Now
  16. Pinterest
  17. Recode
  18. The Verge
  19. Wired and more

You can verify NS with the following standard Unix command:
$ host -t ns twitter.com

twitter.com name server ns2.p34.dynect.net.
twitter.com name server ns1.p34.dynect.net.
twitter.com name server ns4.p34.dynect.net.
twitter.com name server ns3.p34.dynect.net.

From the official announcement:

This attack is mainly impacting US East and is impacting Managed DNS customers in this region. Our Engineers are continuing to work on mitigating this issue. Services have been restored to normal as of 13:20 UTC on 21/Oct/2016. But, I’m still seeing problems.

This DDoS attack may also be impacting Dyn Managed DNS advanced services with possible delays in monitoring. Our Engineers are continuing to work on mitigating this issue. — Oct 21, 2016 – 16:48 UTC

See the “DDoS Attack Against Dyn Managed DNS” update page for up to date information.

(Image credit)

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How To Patch and Protect Linux Kernel Zero Day Local Privilege Escalation Vulnerability CVE-2016-5195 [ 21/Oct/2016 ]

How To Patch and Protect Linux Kernel Zero Day Local Privilege Escalation Vulnerability CVE-2016-5195 [ 21/Oct/2016 ]

A very serious security problem has been found in the Linux kernel. A 0-day local privilege escalation vulnerability has existed for nine years since 2007. This bug affects all sort of of Android or Linux kernel to escalate privileges. Any user can become root in less than 5 seconds. The bug has existed since Linux kernel version 2.6.22+. How do I fix this problem?
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Start / Stop / Restart Lighttpd Web Server

Start / Stop / Restart Lighttpd Web Server
How do I start / stop or restart lighttpd web server under Linux / UNIX operating systems? Most Linux distro includes lighttpd control script. Try following as per your distribution / UNIX version. CentOS / Fedora / RHEL Linux – Start lighttpd # /etc/init.d/lighttpd start OR systemd based CentOS/RHEL 7.x & Fedora Linux latest: # […]
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How to create snapshot in Linux KVM VM/Domain

How to create snapshot in Linux KVM VM/Domain
Before upgrading my virtual machine, I would like to make a snapshot. I want to revert a domain/VM to a snapshot if something goes wrong with my upgrade. Is there a command to create a snapshot of virtual machine (VM) while it is running? Does qemu-kvm support live snapshot creation?
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Shell script to reset ebtables on Linux

Shell script to reset ebtables on Linux
Ebtables is an application program used to set up and maintain the tables of rules (inside the Linux kernel) that inspect Ethernet frames. It is analogous to the iptables application, but less complicated, due to the fact that the Ethernet protocol is much simpler than the IP protocol. ebtables used with bridges on Linux. The following script will stop and clean all ebtables rules:
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How to apply patches on OpenBSD system/kernel and packages easily

How to apply patches on OpenBSD system/kernel and packages easily

I am a regular Linux system user. In Linux (especially CentOS), I am used to applying updates a few times a week using yum command, but how do I do that on my OpenBSD severer? How do I apply updates on OpenBSD operating system?
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Disabling Google Chrome PDF viewer

Disabling Google Chrome PDF viewer
Google Chrome has “Chrome PDF Viewer” to view or open pdf files. It is an unwanted feature. I do not need it at all. I want my PDF open in Preview on a MacOS X or default pdf viewer in Linux. This feature was hidden. I want to disable it from my Google Chrome browser because it was slow scrolling with a large pdf file sizes.
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How to force users to use secure passwords on Ubuntu/Debian Linux

How to force users to use secure passwords on Ubuntu/Debian Linux
My Linux shell user can modify their password using the passwd command. How can I force users to choose the secure password that will prevent users from using stupid passwords like “abc123”, “password”, “123456” and so on? How do I setup password quality requirements on my Debian or Ubuntu Linux server?
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