Satish Kumar

LATEST ARTICLES ( 282 )

• Securing a Network with Uncomplicated Firewall in Ubuntu System

  It is said that the best way to improve server security is to reduce the attack surface. Network communication in any system happens with the help of logical... Read more

  Posted on 11 February 2021

• Install and Configure OpenVPN for Securing Remote Access in Ubuntu

  VPN enables two or more systems to communicate privately and securely over the public network or Internet. The network traffic is routed through the Internet,... Read more

  Posted on 10 February 2021

• Tuning the TCP Stack in Ubuntu Operating System

  Transmission Control Protocol and Internet Protocol (TCP/IP) is a standard set of protocols used by every network-enabled device. TCP/IP defines the standards t... Read more

  Posted on 09 February 2021

• Install and Configure HAProxy for Load Balancing on Ubuntu

  When an application becomes popular, it sends an increased number of requests to the application server. A single application server may not be able to handle... Read more

  Posted on 08 February 2021

• Install and Configure NTP on Ubuntu

  Network Time Protocol (NTP) is a TCP/IP protocol for synchronizing time over a network. Although Ubuntu has a built-in clock that is helpful for keeping track o... Read more

  Posted on 07 February 2021

• Install and Configure Squid Proxy Server on Ubuntu

  In this article, we will install and configure the squid proxy and caching server. The term proxy is generally combined with two different terms: one is... Read more

  Posted on 06 February 2021

• Installing the DNS Server on Ubuntu

  

  DNS, also known as name server, is a service on the Internet that provides mapping between IP addresses and domain names and vice versa. DNS maintains a databas... Read more

  Posted on 05 February 2021

• Installing the DHCP Server on Ubuntu

  DHCP is a service used to automatically assign network configuration to client systems. DHCP can be used as a handy tool when you have a large pool of systems... Read more

  Posted on 04 February 2021

• How to Secure User Accounts in Ubuntu

  In this script, we will look at ways to make user profiles more secure. Follow these steps to secure the user account: Set a strong password policy with the... Read more

  Posted on 03 February 2021

• How to Executing Your Script on Startup

  This script is not limited to running only applications or services at startup, but to also start scripts on bootup (power on) of a system. Read more

  Posted on 02 February 2021

• Write a File-in-file-out Program in Bash and Running Processes in Parallel

  In this script, we use a concept called file-in-file-out (FIFO), also known as pipes, to pass along a parameter to several “worker” scripts. Read more

  Posted on 01 February 2021

• Write a Bash Script to Leveraging Timeout When Waiting for Command Completion

  Sometimes, waiting for a command to finish execution or ignoring commands until completion might not be considered a solid practice in scripting, though it... Read more

  Posted on 31 January 2021

• Write a Bash Script for Using Temporary Files and Lock Files in Your Program

  Another mechanism or component programs and scripts often use is called a lock file. It’s usually temporary (it resides in /tmp) and is sometimes used when... Read more

  Posted on 30 January 2021

• Write a Bash Script for Generating and Trapping Signals for Cleanup

  You have probably pressed Ctrl + C or Ctrl + Z without knowing what was occurring—it’s just like pressing Ctrl + Alt + Delete in another OS, right? Read more

  Posted on 29 January 2021

• Write a Bash Script to Making a Simple Multi-level User Menu Using Select

  Select works using a provided list (for example, it can be a wildcard selection for files) and will give you a list, such as: Select a file from the list: 1.)... Read more

  Posted on 28 January 2021

• Write Bash Script for Sanitizing User Input and for Repeatable Results

  One of the best practices for scripts (or programs, for that matter) is controlling user input, not only for security, but for controlling functionality in a wa... Read more

  Posted on 27 January 2021

• Invoking Commands When They Require Permissions

  Running as root is dangerous, although sometimes convenient—especially when you are new to Linux and password prompts seem to be a hassle. So far, as a Linux... Read more

  Posted on 25 January 2021

• Write a Bash Script to Keep Programs/scripts Running After Logoff

  Leading up to getting our scripts to run as daemons, we need to know how to keep commands running after a user logs off (or better yet, have them started by... Read more

  Posted on 24 January 2021

• Write a Bash Script to Running a Program Continuously (forever) Using Looping...

  This is great for single use scripts, but what about if we wanted to have scripts execute multiple scripts through a menu, or perform tasks in the background... Read more

  Posted on 23 January 2021

• Write a Bash Script to Generating Datasets and Random Files of Various Size

  Usually, data that mimics real-world data is always the best, but sometimes we need an assortment of files of various content and size for validation testing... Read more

  Posted on 22 January 2021