When using Docker containers for development environments (also known as the opposite of micro-services) a common scenario is that you are using a laptop and want to run docker containers on a more powerful machine like a workstation or build server.
This can be done by exposing the Docker service API to the network and connecting to it from a different host. Here’s how to do it.
Syncthing is a decentralized continuous file synchronization software with many security features, like end-to-end encryption, device authentication, permission management and more. Both the protocol specification and the Syncthing software are free and open source.
With Syncthing files can be easily kept in sync across multiple devices, e.g. one desktop PC, one notebook and several mobile devices, *without* relying on third-party infrastructure (optional). File syncing can be limited to a local Wifi network, avoiding sending files to the outside world altogether. Here’s how.
For a long time now I run an AWS Lightsail VPS serving as a wireguard gateway to my home server. Since recently connecting to the Lightsail instance via wireguard is no longer possible.
When I took a look with SSH I got
$> sudo wg-quick up wg0 [#] ip link add wg0 type wireguard RTNETLINK answers: Operation not supported Unable to access interface: Protocol not supported [#] ip link delete dev wg0 Cannot find device "wg0"
To be sure I updated all packages, but the problem still persisted.
The port used by wireguard had not changed and still was accessible according to the network settings of Lightsail.
What change in the Lightsail VPS or network settings could cause an issue like this? It literally just stopped working over night.
This is a very brief article or rather a reminder to myself, about how to install MiniDLNA on Ubuntu Server 20.04. I always knew this piece of software by it’s old name MiniDLNA, but apparently it was renamed and is now called ReadyMedia. There don’t seem to be many changes below the hood though.
MiniDLNA is a light-weight media server using the DLNA protocol. Through MiniDLNA a library of media files is created which allows a user to very conveniently browse through the files and start audio and video playback. Most SmartTVs and Android phones support DLNA out of the box.
It is sometimes desirable to bring a Wireguard interface up each time the system boots. Using wg-quick it is dead easy to create a service which takes care of the required steps. In case wg0 is already up and running, it must be taken down before the service can start successfully.
$> sudo systemctl enable wg-quick@wg0.service $> sudo systemctl daemon-reload $> sudo wg-quick down wg0 $> sudo systemctl start wg-quick@wg0
References:
Since Windows 10 version 1709 (“Fall Creators Update”) neither SMB1 nor NetBios device discovery is supported anymore.
Due to this change a Samba share which is hosted on a Linux machine may no longer show up in the Network view of Windows Explorer.
Although the Samba share can still be reached by it’s hostname or IP address (and share name) this is a slight inconvenience.
Luckily there is a small Python tool called wsdd which provides a Web Service Discovery (host) daemon. What follows is a short guide on how to install and use wsdd on Ubuntu Server 20.04 (works similar for other Debian based distributions).
Wireguard is a modern VPN protocol allowing secure and confidential communication between a network of peers. Wireguard is based on the concept of private-public key cryptography and a number of other modern cryptographic algorithms. Have a look at the wireguard white paper for more details.
Since Linux kernel version 5.6 (late March 2020) wireguard is an integral part of the Linux kernel. That means Linux distributions using a kernel >= 5.6 do not need to install any additional packages in order to support wireguard.
There are two ways to set up a VPN connection with NordVPN on Ubuntu. The first one is to add NordVPN’s package repository to the apt sources and then install the nordvpn client via a simple sudo apt install nordvpn. The second one is to install OpenVPN and configure it to use the servers of NordVPN.
This how-to was written for Ubuntu 18.04 LTS (Bionic Beaver).
When working with IP multicast streams it can sometimes be useful to convert a captured IP stream file to a corresponding MPEG2 transport stream (TS) file. Wireshark has a built-in capability to extract MPEG2-TS packets from the UDP packets of an IP multicast stream. This feature is somewhat hidden away in the menus and not obvious to find.
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