Administration, security and hardening of Linux
Video describes the NUT configuration and how to install Docker, Docker Compose and run the Home Assistant as a Docker container. Additionally I present how to turn off the Mikrotik router from the Raspberry Pi if the battery level state is low.
Continue reading “Configure the NUT to manage a UPS through the Home Assistant as a Docker container on a Raspberry Pi”Article shows how to solve the issue with missing swap and plymouthd sigrtmin error, when swap is not created as LVM, but as a standard swap.
Continue reading “The system does not find the root partition, installed on lvm.”
The tutorial is for Red Hat family server distributions like CentOS 7.x, Red Hat 7.x, Fedora29 or newer (current version is 32), etc.
For Debian family server distributions like (Debian, Ubuntu etc.) I recommend to read this article: How To Setup Telegraf InfluxDB and Grafana on Linux, however it does not contain the own domain and fail2ban setup.
Continue reading “How to setup and secure Telegraf, InfluxDB and Grafana on Linux”To monitor system behavior, you need to start by creating a baseline that represents normal system behavior. You can do this using a tool like the sar command. You can then use tools such as netstat, iostat, lsof, w and uptime to monitor system behavior, comparing the results to the baseline to determine whether the system is experiencing problems.
Continue reading “Measuring System I/O”Capacity planning involves predicting what the capacity requirements for a system will be in future, and planning how to meet these requirements. Monitoring system resource use is important for capacity planning, because it establishes whether existing resource use is approaching capacity limits.
In Linux you can use a range of tools to monitor system resource use. These include the top, ps, pstree, vmstat, sar and free commands.
Continue reading “Linux Resources usage monitoring”Below there is a better explanation from Eric Melo. Thanks Eric for this video!
This blog will be devoted to issues related to the administration of Linux servers. I focused on popular distributions such as Debian 9.8.0, CentOS 7.6, Fedora 29. Of course I won’t stop there, because I have a RHEL (Red Hat Enterprise Linux) 7.7 instance on Virtual Box.
I will describe the solution that I implemented at home on three laptops that serve as servers at home for my own learning purposes. In addition, I bought myself a VPS, on which I configured the environment to host this very site. I also intend to buy another VPS in the future and move the installation of mail server and Samba on one machine. Ultimately, I want to turn off two other laptops (mail server and Samba), hide them in a drawer and have everything in the network.