[Solved] Failed to allocate and map port 53-53 after system restart

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I've made some improvements to the approach. Instead of sleeping for 10 seconds, I wrote a script to check for the connection to the router (IP server) every second, until it finds it. This way the start is quicker.

#!/bin/bash

ipServerAddress="192.168.0.1"
cycleLength=1 # The length of a wait cycle in seconds
timeout=15    # Maximum number of seconds to wait before giving up

elapsedTime=0
ping -c 1 $ipServerAddress > /dev/null 2>&1
while [ $? -ne 0 ]; do
    if [ "$elapsedTime" -ge "$timeout" ]; then
        # Timeout
        exit 1
    fi

    elapsedTime=$((elapsedTime + cycleLength))
    sleep $cycleLength
    ping -c 1 $ipServerAddress > /dev/null 2>&1
done

And then I call this script in the override.conf:

[Service]
# wait for the network to be up
ExecStartPre=/etc/systemd/system/docker.service.d/wait_for_network.sh

I've saved the script next to override.conf into /etc/systemd/system/docker.service.d/. If you save it somewhere else, make sure to call it with the appropriate path. And make sure that the script is executable (chmod +x wait_for_network.sh).

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