Category: administration

Wireguard on Lightsail gone Ship-Wrecked

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.

Installation and Configuration of MiniDLNA/ReadyMedia

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.

Connect Wireguard after Boot

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


Make Samba Share Appear in Windows 10 Network View

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).

How to install SnapRAID on Ubuntu Server 20.04

Recently I migrated my home NAS from OpenMediaVault to Ubuntu Server.
The reason for this was some major issues after upgrading from OMV4 to OMV5. After spending a lot of time to figure out what’s wrong with my NAS after the upgrade, I figured that the main advantage of using OMV (less maintenance) had become an disappointment. So the decision to migrate to Ubuntu Server was made.

OpenMediaVault Issues

So my OpenMediaVault (OMV) NAS did reboot today for some reason. It didn’t manage to boot up successfully again, however, but entered “emergency mode” instead.
After some digging around it seems this is related to the combination of LUKS drive encryption and MergerFS (same with UnionFS).
For normal operation, first the LUKS drives need to be decrypted. Then the decrypted drives can be pooled together with MergerFS.
Some changes in OMV 5 (as compared to OMV 4) cause the boot sequence to enter emergency mode if not all drives in /etc/fstab can be mounted while booting. Since the LUKS drives are still encrypted when booting, mounting those drives obviously fails. And consequently mounting the MergerFS filesystem also cannot succeed.

The issue can be patched by adding the nofail option to all LUKS drives in /etc/fstab and also adding the noauto option to the MergerFS entry in /etc/fstab. It may only be a matter of time until OMV decides to rewrite /etc/fstab, thus nullifying the changes described above.

But since I do not reboot my NAS that often, the above patch works fine for now.



Undelete Files with SnapRAID

Today I accidentally deleted a whole folder of important documents on my OpenMediaVault(OMV) NAS, while doing some cleaning up.
Of course I would have a backup of the folder on an external hard-drive, but this was the perfect opportunity to test SnapRAID.

WSL on Windows 10

There is a new kid in town when it comes to “doing Linux under Windows”. Up to now there was primarily Cygwin and MinGW. But for a while now Microsoft offers the Windows Subsystem for Linux (WSL). I personally think the name should be the other way around (LSW) but what do I know.

How to set up NordVPN on Ubuntu

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).

Installing Altera Quartus Prime on Fedora 23

Installation did run without problems.
Executing >>quartus from the ~/altera/15.1/quartus/bin folder has no effect whatsoever, no error is printed on the command line.
Adding the above path to $PATH has no effect.
Running >>quartus 2> quartus.stderr to redirect stderr to a file uncovers the following error:

>>cat quartus.stderr
>quartus: error while loading shared libraries: cannot open shared >object file: No such file or directory”

Aha, so a file is missing, why can’t quartus just tell me this?

>>sudo dnf search libpng12
>libpng12.i686 : Old version of libpng, needed to run old binaries
>libpng12.x86_64 : Old version of libpng, needed to run old binaries
>libpng12-devel.i686 : Development files for libpng 1.2
>libpng12-devel.x86_64 : Development files for libpng12

>>sudo dnf install libpng12

Ok let’s try again…


Finally, it works.

Powered by WordPress & Theme by Anders Norén

Close Bitnami banner