- Linux Resources
This article covers how to use the "debug" module with some examples. In fact, the Ansible "debug" module is very useful for actively debugging operations as we seen in the given examples. It is equally helpful for getting a verbose output from a playbook.
This article covers an overview of the ULIMIT command in Linux. In fact, ULIMIT command is used for viewing or limiting the resources available to the Linux users.
This article covers the various types of variables used in Ansible. In fact, they are very useful for increasing the flexibility and comprehensibility of a code when used in an appropriate manner.
Basically, The use of variables simplifies the management of dynamic values throughout an Ansible project and can potentially reduce the number of human errors.
This article covers how you can easily activate the Firewall status on Ubuntu system and protect it from almost all the potential threats and attacks. In fact, The Uncomplicated Firewall (ufw) is a frontend for iptables and is particularly well-suited for host-based firewalls. ufw provides a framework for managing netfilter, as well as a command-line interface for manipulating the firewall.
How to enable UFW status on Ubuntu ?
To enable UFW, run the below command:
$ sudo ufw enable
How to Open SSH TCP port 22 connections ?
1. We can easily open SSH TCP port 22 using UFW as follows:
$ sudo ufw allow ssh
2. If you are running ssh on TCP port 2222 or TCP port 2323, run:
$ sudo ufw allow 2222/tcp
$ sudo ufw allow 2323/tcp
This article covers the ways of sending a process to the background in Ubuntu Linux system. In fact, a background process is a process/command that is started from a terminal and runs in the background, without interaction from the user.
This article covers the procedure of allowing a UFW port on Ubuntu. In fact, UncomplicatedFirewall (UFW) is a command-line, frontend iptables manager, similar to Firewalld and ConfigServer Security & Firewall (CSF).
After you uninstall software you should close any ports you no longer need open on your system. You can accomplish this using the service name or port number.
1. To close a port in UFW using the service name:
$ sudo ufw deny pop3
2. To close a port in UFW using the port number:
$ sudo ufw deny 995
1. To check whether UFW is running:
$ sudo ufw status
2. To check whether UFW is running with additional information such as logging and profile status:
$ sudo ufw status verbose
3. To find the rule number for UFW rules:
$ sudo ufw status numbered
4. Then you can remove the rule:
$ sudo ufw delete 1