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This article explains how to iptables -A add iptables firewall rules using the (append) command. -A for appending. If it makes it easier for us to remember -A as adding rules (rather than appending rules), then that's fine. However, remembe...

On Red Hat based Linux, iptables comes with some default rules. It is a good idea to clean them up and start from scratch. This article is part of the ongoing iptables tutorial series. This is the 2nd article in the series. In our first par...

At first glance, iptables rules may seem cryptic. In this article, we have given 25 useful IPTables rules that you can copy/paste and use as needed. These examples will serve as a basic template for us to adapt these rules to our specific r...

As explained in this article, we can use ssky-keygen and ssh-copy-id to log in to a remote Linux server without a password in 3 simple steps. ssh-keygen Create public and private keys. ssh-copy-id Copy the local host's public key to the rem...

In our previous article, we discussed how to set up ssh key-based authentication to perform ssh and scp without a password in the following three scenarios: OpenSSH to OpenSSH OpenSSH to SSH2 SSH2 to SSH2 In this article, I will explain how...

SSH key-based authentication has two levels of security. In order for us to log in, we need both the private key and the password. Even if one of them is compromised, the attacker still won’t be able to log into our account because both o...

I have previously explained how to perform SSH and SCP on openSSH without entering a password . In this article, I will explain how to set up key-based authentication on SSH2 and perform SSH/SCP without entering a password using the followi...

Previous articles ( openSSH to openSSH setup , SSH2 to SSH2 setup ) explained how to set up key-based authentication on the same version of ssh to perform ssh and scp without entering a password. This article explains how to set up SSH key-...

In addition to the basic operation of finding files under the directory structure, we can also use find the command to perform some practical operations, which will make our command line journey easy. In this article, let us review 15 find...

WordPress is one of the most popular open source content management systems (CMS) with a market share of up to 60% compared to other CMS like Drupal or Joomla. WordPress can be used to develop any type of website, be it a blog, a small busi...

When writing web applications, I often need to offload computationally heavy tasks to an asynchronous worker script, schedule the task for later, or even write a daemon that listens on a socket to communicate directly with the client. While...

I rarely use it man pages , because searching for the syntax or specific flags of a command is much faster than browsing through a lot of information we may not need. However, I found a package that summarizes the output of the man pages an...

By using Homebrew, you can greatly reduce the cost of setting up and configuring a development environment on Mac OS X. Let's install Redis. $ brew install redis After installation, we will see some notifications about configuration conside...

Commonly used terminals on Mac are terminal and iterm. In many cases, we need to modify the host name displayed in these terminals. As shown in the figure above, we use the command hostname to view the current host name From the results we...

Nginx is one of the most popular web servers in the world, responsible for hosting some of the largest and most trafficked sites on the Internet. It is a lightweight application software that can be used as a web server or a reverse proxy....