Shutting down the the Apalis SoM from inside a docker container

Technical Support
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here is an example mentioned by Jeremias approach

wait_for_shutdown.service file will be used to control the service

[Unit]
Description=Wait for the signal to shutdown system through a shared file

[Service]
Restart=on-failure
Type=simple
ExecStart=/opt/app-system/wait_for_shutdown.sh
RestartSec=5

[Install]
WantedBy=multi-user.target

wait_for_shutdown.sh file waits for a signal in the shared file

#!/bin/sh

echo "start wait_for_shutdown service"
echo "waiting" > /var/run/shutdown_signal
echo "start wait_for_shutdown service while-do"
while sleep 1; do 
  signal=$(cat /var/run/shutdown_signal)
  if [ "$signal" == "true" ]; then 
    echo "wait_for_shutdown service - received shutdown"
    echo "done" > /var/run/shutdown_signal
    shutdown -h now
  fi
done
echo "end wait_for_shutdown service while-do"

wait_for_shutdown_service_install.sh file - use this script to install the service

#!/bin/sh

mkdir -p /opt/app_system
cp ./wait_for_shutdown.sh /opt/app_system
sudo cp ./wait_for_shutdown.service /etc/systemd/system
sudo systemctl enable wait_for_shutdown.service
sudo systemctl start wait_for_shutdown.service
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