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How to use chmod to change file and directory permissions.

In this episode I will show you how to change passwords for users, how to add groups, how to add users to groups, how to add users to groups and how to change the directory owner and give access to the directory for the group.

RHCSA – Adding users Short and to the point, how to add users, as well as how to add those with a specific id and what happens after adding such a user when we add another without the -u switch.

Installation of Red Hat in Virtual Box – network configuration and ssh.

How to download a Red Hat 7.7 image

In the next few weeks, I intend to publish my own training courses entirely in Polish related to RHCSA. Yes, free of charge, because these are the basics of any Linux distribution in principle and in my opinion it is ridiculously simple. The exam requires you to understand and remember the commands by heart, so it’s not that simple anymore, because the commands come in as time goes by when you tap them every day with your finger. ...

Note, the following tutorial is a part of my engineering work entitled „Hardening of a Linux-based network server” under the direction of Ph. D. Kordian Smolinski in the Department of Theoretical Physics WFiIS UŁ defended in June 2019. To install Fail2Ban on CentOS 7.6, you will first need to install the EPEL (Extra Packages for Enterprise Linux) repository. EPEL contains additional packages for all versions of CentOS, one of these additional packages is Fail2Ban. ...

Hello, I will use rclone from https://rclone to backup my backup.org In this specific case I will use https://mega.nz and the appropriate configuration to copy files from the server to mega.nz. If you don’t have an account there, you can create one. Good morning everyone gets 50 GB of space for free. Please note that at the moment there is a problem with 2FA for mega. Trying to compile an application from the source code by following the instructions from this page https://github.com/meganz/MEGAsync ends in an error. This is due to a compiler error, which in this case has too little memory, 128 MB RAM, 170 MB swap and too little CPU resources to complete the compilation properly. Process cc1plus is killed (kill) and the compilation of Crypto++ fails. ...

Hi, There was an opportunity like a blind chicken grain long ago and I hunted the domain for free sysadmin.info.pl. Originally the idea was to use it for engineering work and so it happened. Three months later again an opportunity came up, which I couldn’t miss. This time the virtual machine on OpenVZ for funny money. If you are interested, please contact https://mikr.us. After clicking on the link you will get a 5% discount on the server for the year ...

Hello, I will describe here step by step configuration of WordPress in configuration of two servers. These can be physical servers, or installed on virtual machines, either using VirtualBox or HyperV. Usually we encounter these configurations above, of course there are also other solutions, such as in the case of the hosting service provider, which has a database elsewhere, and in another location keeps a directory on the files of the website, but I will deal with the classic case, when we distinguish between two different servers. ...