Tag Archives: cent os

How to delete KVM VM guest using virsh command

How to delete KVM VM guest using virsh command

I am a new Linux and KVM user. How do I delete a VM guest with virsh command line on Linux operating system? How do I delete a virtual machine called vps42 on Ubuntu or CentOS Linux server?
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How to forcefully mark down pfSense Gateway as down

How to forcefully mark down pfSense Gateway as down

I have two internet connections (fiber and 4G LTE) configured in load balanced mode using pfSense FreeBSD based firewall. One of my connection is running out of bandwidth quota. How can I force and turn off this interface to save bandwidth until month end and enable it again from next billing cycle?
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It is not UNIX’s job to stop you from shooting your foot. If you so choose to do so, then it is UNIX’s job to deliver Mr. Bullet to Mr Foot in the most efficient way it knows.

It is not UNIX’s job to stop you from shooting your foot. If you so choose to do so, then it is UNIX’s job to deliver Mr. Bullet to Mr Foot in the most efficient way it knows.

Here is Terry Lambert quote for you.

It is not UNIX's job to stop you from shooting your foot. If you so choose to do so, then it is UNIX's job to deliver Mr. Bullet to Mr Foot in the most efficient way it knows.

It is not UNIX’s job to stop you from shooting your foot. If you so
choose to do so, then it is UNIX’s job to deliver Mr. Bullet to Mr Foot
in the most efficient way it knows.

Do you agree with it?

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Schrodinger Backups: The condition of any backup is unknown until a restore is attempted

Schrodinger Backups: The condition of any backup is unknown until a restore is attempted

A tweet about backups got pretty popular among sysadmin and IT community. The tweet read as follows:

Picture

The condition of any backup is unknown until a restore is attempted

The condition of any backup is unknown until a restore is attempted

Here is a tweet

#Sysadmin #Truth #Backup #Unix #Linux pic.twitter.com/suCT9ME58V

— nixCraft # (@nixcraft) June 24, 2015

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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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