Watch Notification System - v 2023.09.5

Finally got my alerts working, so when a host goes haywire I get an alert on the Phone and Cloud, with E-Mail as backup.

Virtual Machines (VM)

A Virtual Machine (VM) is a way to create a whole operating system, with many applications, that is able to be moved from one physical machine to another physical machine. This has advantages in case of hardware, location or network problems to quickly and correctly restore service …

Network Management

The command line offers a wealth of network management commands. Here are some of my favorites.

nmcli

NetworkManager has a command line interface (CLI).

Get status:

$ nmcli general status
STATE      CONNECTIVITY  WIFI-HW …

Encrypting Files

You should protect your carefully built system and it's files from abuse, tampering, or just plain spying. It's easy to do, what are you waiting for? Encrypt your data directory now.

Virtual IP Ethernet Interface

Virtual IP Interface behaves like a normal interface. All traffic routed to it will go through the master interface (for example, eth0) but with a VLAN tag. Only VLAN-aware devices can accept them if configured correctly, else the traffic is dropped.

Set Up a New Server

I use this as a guide to enable proper monitoring and maintenance of any new server on the network.

Docker

Docker is a way to manage containers, which are like namespaces or jails. Here are some useful common commands to check out the status of these containers.

BeagleBone Single Board Computer (SBC)

The BeagleBone (BB) [1] line supports the Linux kernel and GPIO hardware connections to devices via device trees [2]. It is simular to the Rasberry-PI line, only BB is open source hardware.

Web Certificate

Web certificates encrypt different messages over the public internet so nobody can see what these messages contain.

Cloud Systems

A cloud used to be floating in the sky, then it was a bubbly thing on a network diagram where weird things happen. Now a cloud just means "Somebody else's computer.". Of course you get to it over a network and can share things, like files (pictures, music …