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As a Linux system administrator, there are many different ways to transfer files, securely or not, between two different hosts. As a consequence, you want to transfer files, but you want to do it in a very secure and safe way. Luckily for you, there are many different commands that you can use in order to achieve that. In this tutorial, we are going to see all the different ways to transfer files between hosts on Linux using either ftp, sftp, scp or rsync.

From all the web servers available, the Apache Web Server is probably one of the most popular ones.

Developed by the Apache Foundation, Apache is so popular that it runs 70% of all the webservers online.

When starting with a fresh CentOS 8 instance, adding and deleting users is one of the most basic tasks that you may have to do.

Adding user can be quite useful. In this tutorial, we are going all the ways to add and delete users on CentOS 8.

This tutorial focuses on how to create swap space on CentOS 8 using a swap file or a swap partition.

On CentOS 8, it is quite common to run out of memory.

It can be because you are running too many programs, or because some of your programs are taking too many resources from your CentOS 8 host.

In today’s tutorial, we are going to focus on adding a user to sudoers on the most recent CentOS distribution : CentOS 8.

In CentOS 8, there are two ways of adding a user to sudoers : you can add it to the wheel group (similar to the sudo group on Debian based distributions) or you can add the user to the sudoers file.

Here are the details of the two methods used.

CentOS 8 has been finally released on the 24th of September 2019, and it has come with a lot of very great features for system administrators. This tutorial provides step-by-step instructions about how to install CentOS 8 with a GNOME desktop.

As a system administrator, you are probably spending quite some time configuring permissions for user and groups on your system. File permissions are already quite handy in order to give read, write or execute permissions to directories or files. This is exactly what access control lists, also shortened ACL, are solving on a Linux system. In today’s tutorial, we are taking a very close look at access control lists, what they are and how they are used in order to configure a Linux system properly.

SSH, for Secure Shell, is a network protocol that is used in order to operate remote logins to distant machines within a local network or over Internet. SSH architectures typically includes a SSH server that is used by SSH clients to connect to the remote machine.

In this tutorial, we are going to see how you can install and enable SSH, via OpenSSH, on a Debian 10 distributions.

On Linux, it is essential to have some basics when it comes to changing the timezone. The timezone is a parameter set at the installation stage and that determines the current date for your host. Setting a correct timezone is crucial : your web and application servers may rely on this date for deserializing for example.

The source command on Linux is a pretty popular function run by system administrators daily. But what is the function of the source command? Used to refresh the current shell environment, the source command can also be used in order to import functions into other bash scripts or to run scripts into the current shell environment.

As a system administrator, it is very likely that you spend a lot of time doing recurring tasks on your system. Luckily for you, there is a way to automate tasks on Linux systems : cron jobs. Initially built in 1975 by the AT&T Bell Laboratories, cron has evolved to become a reference on Linux when it comes to scheduling and executing tasks at fixed dates or periods.

On Linux, as a system administrator, you often want to have a complete list of all the users and all the groups on your host. It is quite crucial for security purposes to make sure that you have the correct amount of users and that you didn’t forget to delete some. There are several ways to list users and groups on Linux.

As a system administrator, it is a very common task to look for a specific file on your file system. However, it might be sometimes hard to find files on a Linux filesystem especially if you have dozens of different users.

There are two commands that can help you achieve your goal : find and locate. In this tutorial, we are going to see how to use those commands effectively and how they can be tuned to achieve what we are looking for.

For a system administrator, it is very common to perform input or output redirection during its daily work. Input and output redirection is a very powerful tool, allowing you to connect multiple commands together as well as synthetizing the output of multiple commands. Input / output redirection is a core concept of Unix based systems – and it can be used as a way to increase programmer productivity tremendously.

Standard files, directories, links, devices, sockets, Linux systems offer a wide variety of different file types. Today, we are focusing on links, and more specifically on hard and soft links. If you have always wondered how you can create a shortcut on a Linux system, this is probably the right tutorial for you.

On a Linux system, it is very common to run out of memory, because you run too many programs, or because you run programs that are consuming too much memory. As a consequence, if your RAM is full, you won’t be able to launch new programs on your computer. In this tutorial, we are going to see how you can add swap space on Debian 10, either by creating a swap file or by creating a disk partition dedicated to swap.

In this tutorial, we are taking a look at the Blackbox exporter for Prometheus. The Blackbox exporter is a tool that allows engineers to monitor HTTP, DNS, TCP and ICMP endpoints. Results can be visualized in modern dashboard tools such as Grafana.

On Debian 10, users are able to change their password pretty easily.

It is also possible, if you have sudo rights, to change user passwords as well as to define rules for password change on the host.

In this tutorial, we are going to see how you can change the user password on Debian 10 through the command-line and the user interface if you are using a GNOME desktop.

Adding and deleting users is one of the most basic tasks when starting from a fresh Debian 10 server. Adding user can be quite useful. As your host grows, you want to add new users, assign them special permissions, like sudo rights for example. In this tutorial, we are going all the ways to add and delete users on Debian 10 hosts.

Created in 2012 at SoundCloud, Prometheus is a time series database used in DevOps for real time monitoring. Prometheus is part of an ecosystem that provides alerting, dashboarding as well as a whole set of tools to bind to your existing datasources but Docker is a virtualization platform that provides a way to easily create, manage and run containers in a single node environment or a cluster. In this tutorial, we are going to install Prometheus with Docker as well as setting up a basic configuration for Prometheus.