Puppet is an open source tool designed to greatly simplify automation and reporting for system administrators. It is basically a configuration management software that helps to configure and maintain servers and other systems in an enterprise network. System administrators usually spend a lot of time doing the same tasks repeatedly every day. They always want to automate these tasks so that they can have more time to deal with other projects or learn new concepts and scripting languages. Administrators can automate tasks by writing scripts, but in companies with large networks, scripts are not very convenient. At this time, puppets are very useful, because with puppets, you can:

Define unique configuration settings for each host on the network;

Continuously monitor any changes in the network;

Help effectively create and manage users;

Helps manage the configuration settings of each open source tool.

2. Chef

Chef is another popular automation tool for Linux system administrators. It is written in Ruby and Erlang, which is very helpful for configuring and maintaining the company's servers, whether your company has ten servers or hundreds. It can also help you integrate the cloud server with Amazon EC2, OpenStack, RackSpace or Google Cloud. Chef can turn your infrastructure into code, so with the help of code, you can easily remove a server by modifying only a few lines of code, which is convenient for you to manage the server. Physical nodes also mean that changes can be easily tested before they are deployed to the production environment, and you can easily control each updated version of the code. Chef DK provides you with all the tools to test and manage your configuration. Chef server acts as a repository for all recipes and can manage every node connected to the server. Chef client software runs on each client and receives information about the server from time to time, thus updating its configuration settings.

3.CFEngine

The next automation tool for Linux system administrators is CFEngine, another leading automation system, which can help you easily manage and automate the entire infrastructure. Once you use CF Engine to define the configuration for the systems in the network, CFEngine will automatically ensure that the configuration meets the specifications. Needless to say, if there are 10 or 100 nodes in your network, you can update or change any or all nodes in just a few seconds. CFEngine is favored by many Linux system administrators because of its low running cost, fast response and self-healing function.

4.Ansible

Ansible is an open source configuration management and IT enterprise automation software provided by Red Hat. It comes with a simple programming language, which enables the system administrator to handle the automation and configuration process effectively. Ansible consists of a controller and nodes controlled by the controller. Nodes are controlled by SSH. One of the main characteristics of Ansible is that the proxy is not deployed to the node, but communicates with SSH completely. Easy to learn and use, consistency, high reliability and security are other characteristics that stand out from Ansible. Ansible's only limitation is that bare metal and virtual machines cannot be configured.

5. Male foreman

Foreman is another open source configuration management tool for forensic analysis. Foreman provides a control panel through which we can configure bare metal servers and virtual machines. By default, whenever we install Foreman, it uses Puppet as a configuration tool. But with the help of plug-ins, Foreman also supports the integration with other configuration management tools, such as Chef, Puppet, Ansible, Salt and many other tools. Foreman automation tools also come with various interfaces, including command-line interface, Web front-end and REST API. Other important functions of the foreman include:

Manage the changes of puppet modules and puppet classes through the dashboard;

It is easy to manage the puppet environment from Foreman dashboard;

Thanks to the dashboard, it is easy to create host groups and add puppet modules to them.

Puppet modules can be easily added or pushed to nodes from Foreman dashboard.

6. Catelot

Katello is another open source automation tool. In other words, we can say that Katello is an open source version of Red Hat satellite server; If you don't want to spend money on enterprise products and their support, you can use it instead of Red Hat satellite server. Katello has been acquired by Foreman, and most of the functions in Foreman are also supported in Katello. The main functions of Cartraud server are as follows:

Patch Linux-based servers (RHEL and CentOS);

Synchronize the code base with pullservice;

Use the foreman for various configurations;

It can also handle subscription content management and audit all deployed software packages;

With Katello, you can create a host group for all hosts, and you can perform operations in batches on a single host or a group of hosts.

7. Nagios

Nagios, now called Nagios Core, is an open source automation and monitoring tool that can manage all systems in the infrastructure. It also provides an alarm service. Once you notice a problem in the network, you will alert the system administrator. Using SNMP and Nagios, system administrators can also control and manage printers, routers and switches. Nagios allows us to create event handling tools, which can automatically restart failed applications and their services once they stop.