Docker Containers by examples – Intro
Intro This article is the first of a series that I called "Docker containers by examples" where I am sharing my experience in learning and using Docker in real life…
GNU/Linux Automatic Security updates with cron-apt and e-mail notifications (msmtp)
Everytime I build a new server one of the feature that I immediately configure is to install security update automatically for the Operating System and installed pakckages. In Debian you…
[LinuxAdmin] E-mail with Push notifications with fetchmail
I have several e-mail accounts that are managed from a single server. The way they are managed consists in having fetchmail retrieving (fetching, indeed) every configured amount of seconds. Of…
[HowTo] Automated VPS backup from NAS Qnap
Yet another small how-to that will work mainly as a way for myself to remember how I did setup a QNAP NAS Appliance to use rsync with ssh and make…
[HowTo] Install Coreboot and disable Intel ME on Lenovo Thinkpad X230
I have been promising to myself for very long time that one day I had to have a computer as much privacy focused as possible. As I cannot afford to…
[How To] Monero (XMR) Wallet with Trezor Model T
Recently the GitHub user ph4r05 released some commits for the Monero wallet GUI that enabled the use of Trezor Model T with the Monero cryptocurrency (XMR). As the commits are…
[SysAdmin] Create isolated WiFi network on OPNSense with local wireless interface
During the last months I am using OPNSense as my firewall (moving away from PFSense). At the very beginning I was using it on an apu2d board but then I…
Configure OpenVSwitch and libvirt to enable trunking (802.1q) between KVM Guests
The goal of this article is to cover a complete configuration of OpenVSwitch and KVM networking to have ports of the virtual switch allowing trunking toward the KVM guests. The…
[Networking Lab] RIP and RIPng configuration exercise (TCP/IP Volume 1)
Hi there! Yet another GNS3 laboratory for a bit of practice. This time I arranged the starting configuration to play with RIP and RIPng following the exercise found on TCP/IP…
[Networking] Select a mask so that there will be a specific number of subnets and hosts available
This is mainly a reminder for myself and for who is working with subnetting and with the always arising question about how to work with subnets design. The question to…
[Linux server] How to update DNS entries from DHCP to BIND9
After talking about this topic with a friend during last week, I decided to start running a local DNS server in my home network. The goals of the server are:…
[Networking Lab] Configure 802.1x authentication on Cisco switch IOU with GNS3
In this post I will show you again the power of GNS3 in doing laboratories to test new features. I will provide you a Lab example to configure and test…
[Networking – Lab] Ready-to-go GNS3 Switch and Routers config for your lab.
A lot of times, when you would like to reproduce some behavior in a Network, you need to add a lot of basic configs on your routers and switches. You…
[Networking] Alternatives to packet tracer (was: Softwares to build a virtual lab)
Maybe this article will not bring to your knowledge something new, but it happened to me in the recent past that not all the friends and collegues I was talking…
[Networking – LAB] OSPF, get familiar with LSA types and AREAs
I am always reviewing Routing topics to have them all the time fresh in my mind, especially when I don't practice with them a lot during daily works. This time…