In Linux, you can change the maximum amount of open files. You may modify this number by using the ulimit command. It grants you the ability to control the resources available for the shell or process started by it.
In this short tutorial we will show you how to check your current limit of open files and files descriptions, but to do so, you will need to have root access to your system.
First, Lets see how we can find out the maximum number of opened file descriptors on your Linux system.
UFW, or Uncomplicated Firewall, is an interface to
iptables that is geared towards simplifying the process of configuring a firewall. While
iptables is a solid and flexible tool, it can be difficult for beginners to learn how to use it to properly configure a firewall. If you’re looking to get started securing your network, and you’re not sure which tool to use, UFW may be the right choice for you.
This tutorial will show you how to set up a firewall with UFW on Ubuntu 16.04.
Ubuntu 12.04 (code named as : Precise Pangolin) is a LTS release (right now only beta version is available, stable will be out in a couple of weeks) – with 5 years of official support and updates. So LTS version is well suitable for production environment and if you’re using 11.10 or any other versions then you may want to switch to 12.04 for latest features, packages and stability.