service

Ubuntu Pi-hole DNS Fix: Pi-hole could not start DNS service after upgrading Ubuntu

 in GNU/Linux  tagged daemon / DNS / dnsmasq / Faster Than Light / FTL / LTS / LXD / pi-hole / pihole / server / service / ubuntu by

Ubuntu is a widespread Linux distribution that has gained popularity over the years. One of the advantages of Ubuntu is its Long-Term Support (LTS) releases, which have been supported for several years and receive regular updates and security patches. Upgrading from one LTS release to another is a common task for Ubuntu users. However, sometimes things don’t go as planned, and some services may fail to start after the upgrade. In this blog post, we will explore one issue that Ubuntu users may encounter when upgrading from 18.04LTS to 20.04LTS or 22.04LTS and how to fix it.

The problem we will discuss is related to Pi-hole, a popular network-level advertisement and Internet tracker blocking application. Pi-hole uses DNS (Domain Name System) to stop unwanted traffic on your network. After upgrading from Ubuntu 18.04LTS to 20.04LTS or 22.04LTS, some users may encounter an issue where the DNS service for Pi-hole fails to start. The reason behind this is a broken symbolic link at /etc/dnsmasq.d/lxd.

LXD is a system container manager that allows users to run multiple isolated Linux systems (containers) on a single host. During the upgrade process, the symbolic link for LXD may become broken, causing the DNS service for Pi-hole to fail to start. Fortunately, the solution to this problem is simple. Users can remove the broken symbolic link by running the following command in the terminal:

sudo rm /etc/dnsmasq.d/lxd;

Once the broken symbolic link is removed, users can restart the DNS service for Pi-hole by running the following command:

pihole restartdns;

This command will restart the Pi-hole FTL (Faster Than Light) daemon, which handles DNS requests and blocks unwanted traffic.

In conclusion, upgrading from one LTS release to another is a common task for Ubuntu users. However, sometimes things may not go as planned, and some services may fail to start after the upgrade. One such issue that users may encounter is related to Pi-hole, where the DNS service fails to start due to a broken symbolic link at /etc/dnsmasq.d/lxd. Fortunately, the solution to this problem is simple, and users can fix it by removing the broken symbolic link and restarting the Pi-hole FTL daemon.

DJI care – No activation code

 in Other / Photography  tagged activation code / DJI / DJI care / Replacement Service / service / service plan by

We purchased a DJI Mini 3 Pro and powered it on.

After that, we purchased a DJI Care Refresh (2-Year Plan).

In the DJI controller, there was a warning that we needed to activate the service plan within 48 hours. Clicking on that option would require an activation code.

DJI did not send us an activation code with the purchase of the service plan.

We used https://service.dji.com/djicare/coverage to verify that our purchase was valid, but no information on the activation code was available.

From the controller, we want to the profile settings and unbound the drone. After we bound it again, the Replacement Service was marked as valid.

Bind for 0.0.0.0:443 failed: port is already allocated

 in Docker  tagged bind / docker / docker-compose / images / pull / restart / service / timeout / update by

On a Docker installation that we have, we updated the image files for our containers using the following command:

docker images --format "{{.Repository}}:{{.Tag}}" | grep ':latest' | xargs -L1 docker pull;

Then we tried to update our container, as usual, using the docker-compose command.

export COMPOSE_HTTP_TIMEOUT=180; # We extend the timeout to ensure there is enough time for all containers to start
docker-compose up -d --remove-orphans;

Unfortunately, we got the following error:

export COMPOSE_HTTP_TIMEOUT=180;
docker-compose up -d --remove-orphans;

Starting entry ... 
Starting entry ... error

ERROR: for entry  Cannot start service entry: driver failed programming external connectivity on endpoint entry (d3a5d95f55c4e872801e92b1f32d9693553bd553c414a371b8ba903cb48c2bd5): Bind for 0.0.0.0:443 failed: port is already allocated

ERROR: for entry  Cannot start service entry: driver failed programming external connectivity on endpoint entry (d3a5d95f55c4e872801e92b1f32d9693553bd553c414a371b8ba903cb48c2bd5): Bind for 0.0.0.0:443 failed: port is already allocated
ERROR: Encountered errors while bringing up the project.

We used the docker container ls command to check which container was hoarding port 443, but none was doing so. Because of this, we assumed that docker ran into a bug. The first step we took (and the last) which solved the problem was to restart the docker service as follows:

sudo service docker restart;

This command was enough to fix our problem without messing with docker further.