Symbolic and Hard Links are useful ways to reference to information on a disk, both found in UNIX and Linux systems. While they seem similar in the surface they are quite different in how they work and it what can be achieved when using them. If you find the articles in Adminbyaccident.com useful to you, […]
Symbolic and Hard Links in UNIX and Linux
How to install Nextcloud on FreeBSD 12
Nextcloud. Have you heard of it? That’s quite probable if you’re here. But, what is it, what is it? Some say it is a Google Apps replacement, some say it’s just a place to store your documents, some others just rely on it to share documents across the company and edit them just in time […]
How to patch OpenSSH in FreeBSD 12.2
The default version of OpenSSH in FreeBSD 12.2 today, and it’s been this for quite some time, is not the most recent published by the OpenBSD guys, which by the way are the ones developing OpenSSH. Not only is not the latest but it has a few vulnerabilities affecting it, medium risk ones but nevertheless […]
Who am I?
My name is Albert Valbuena. I am a retired ski instructor and after a period of five years in the international department of a logistics company I recently moved in to the IT industry. It hasn’t been overnight and it is still work in progress. A few years ago I started a website called www.skireviewer.com. […]
How to install sudo in FreeBSD
Sudo is a very useful application. It allows a regular user to perform tasks only reserved to the root account. There is lots of documentation about sudo and there is even a book about it called “Sudo Mastery”. If you need to investigate deep on this, buy it. Why do you need this? Well… Everyone […]
How to install the bash shell on FreeBSD
Believe it or not the Bash shell does not come installed on the system. By default FreeBSD uses the sh shell (after the rewrite under the BSD license on 1989 of the original Bourne Shell found on UNIX, which had inherited the ‘sh’ name from the original’s Thomson shell), the C shell or the tcsh […]
How to install Nagios on FreeBSD
As explained in an introduction article, Nagios is a monitoring software very well established and used in production on many environments. Results are displayed in a web page so it uses a web server to publish them to the user and needs some php code to do so. It is configured through files which happen […]
ARP spoofing attacks
ARP spoofing attacks are quite harming and they can easily constitute a man-in-the-middle (MITM) attack. They consist on the attacker sending ARP packets into the network the victim is located, typically redirecting traffic to the attacker’s machine. Once this is achieved the attacker can sniff all the traffic sent by the victim’s device and obtain […]
How to use Fail2ban with WordPress
In a previous article we did an install of Fail2ban on a FreeBSD server. This tool can help us to protect our WordPress install, independatly from if we are using the FAMP stack or the LAMP stack. As I mentioned on that article Fail2ban is a complementary tool to our firewall. It works by scanning […]
How to secure the ELK stack on CentOS 8
This is a follow up of the ‘how to install the ELK stack on CentOS 8’. That is a basic setup with no security at all. There is no encryption, no username and password setup, nothing. Not even firewall rules to filter ports. And as it’s known security can’t only rely on one factor but […]