Find out what process are using swap space

on January 19th, 2017 by Hades

The top and free command display the total amount of free and used physical and swap memory in the server. How do I determine which process is using swap space under Linux operating systems? How do I find out swap […]

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How to check root partition with fsck?

on January 19th, 2017 by Hades

Sometimes you have to check the disc “here and right now”. If you run fsck with an indication of your disk, then most likely they are to mount and fsck will warn that it is fraught for you. How to be? Unmount to check? What about the roots?
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Option for OpenVPN to enable floating source port

on January 5th, 2017 by Hades

Sometimes it make sense to change the default ports of an OpenVPN installation, because these are those which are in case of an vulnerability scan attacked first or some company firewall rules makes it necessary.
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How to make firewall changes permanent via firewall-cmd?

on January 4th, 2017 by Hades

If you’re trying to adding a firewall rule by iptables (lol) in the Centos 7 where is a new firewall instead of firewall-cmd it will not work after reboot or restart service firewalld.
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Create an SSH user who only has permission to access specific folder

on December 21st, 2016 by Hades

Just create a new user with it’s home directory set to the one you need him to have access to (this command must be run under sudo or in root shell)
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vnStat is a console-based network traffic monitor

on December 17th, 2016 by Hades

vnStat is a console-based network traffic monitor for Linux and BSD that keeps a log of network traffic for the selected interface(s). It uses the network interface statistics provided by the kernel as information source. This means that vnStat won’t […]

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How to install GoLang 1.5 on Ubuntu

on December 10th, 2016 by Hades

Check what the latest version are from GoLang: Golang Downloads
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Creating A Bootable USB Of Windows/Linux On OS X

on November 12th, 2016 by Hades

With macOS Sierra, El Capitan, Yosemite, or Mavericks, you can use a USB flash drive or other removable media as a startup disk from which to install the Windows/Linux operating system. These advanced steps are intended primarly for system administrators […]

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on November 10th, 2016 by Hades

Please do not use the root user for mysqldump backups. Just create a new user with the following minimal MySQL privileges:
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How to disable reset password in WordPress via login form

on November 9th, 2016 by Hades

Are you looking to remove the password reset option in WordPress? By default, WordPress allows users to reset/change password by providing their email address. Sometimes you may want to disable password reset option in WordPress. In this article, we will […]

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How to configure RAID on DELL PowerEdge 610

on November 5th, 2016 by Hades

For Dell servers, you use the Dell PowerEdge RAID Controller (PERC) to create a RAID volume that uses all physical disks on a server.
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How to restore the old network interface name in RHEL 7 / Centos 7

on November 3rd, 2016 by Hades

As people were complaining about network interface names changing each time a new one was added, it was decided to call a network interface according to its physical location. The details of the naming convention are available in the RHEL 7 Networking Guide.
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How to update nodeJS to the latest version

on October 31st, 2016 by Hades

I’ve installed nodeJS on Ubuntu with following code
sudo apt-get install nodejs-legacy npm

nodejs --version

it shows v0.10.25

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Overclocking ATI cards in Linux

on October 30th, 2016 by Hades

This is a small guide for overclocking your ATI card under Linux. This guide targets Ubuntu, but it should be the same for any distro.


– Working fglrx driver
– Card supported by Overdrive (last time I checked only r6xx and up were supported, mobile and integrate chips excluded)

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Cisco 6807 VSS ISSU Upgrade

on October 28th, 2016 by Hades

The Request:

I have a client with multiple 6807 VSS pairs that required an IOS upgrade. All of the pairs have a single SUP2-T in each chassis and were in the 15 code train.

Although the ISSU process is very straight forward I wanted to put this quick process up as I had to search through multiple documents to gather all the pieces I needed to knock it out.

The Solution:

Since these switches were in the proper code train to utilize ISSU I decided that was the best route to go. It also helps that everything was already dual-homed. This process is for VSS pairs with only one SUP per chassis! If you have another configuration you can reference the Cisco document provided at the bottom of the post.

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