1. Create a Script to Check the Docker Container and Manage Port 443:

Create a script, say check_and_restart_docker.sh, with the following content:

```bash #!/bin/bash

# Docker container ID to check CONTAINER_ID="875ca0bef633"

# Check if the Docker container is running if ! docker ps | grep -q "$CONTAINER_ID"; then echo "Docker container $CONTAINER_ID is not running."

 # Find the process using port 443
 PID=$(sudo lsof -t -i:443)

 if [ -n "$PID" ]; then
   echo "Killing process $PID using port 443."
   sudo kill -9 $PID
 fi

 # Start the Docker container
 echo "Starting Docker container $CONTAINER_ID."
 docker start $CONTAINER_ID

else echo "Docker container $CONTAINER_ID is running." fi ```

  1. Make the Script Executable:

bash sudo chmod +x /path/to/check_and_restart_docker.sh

  1. Create a Cron Job to Run the Script Periodically:

Open the cron job editor:

bash sudo crontab -e

Add the following line to run the script every 5 minutes (adjust the interval as needed):

bash */5 * * * * /path/to/check_and_restart_docker.sh >> /var/log/check_and_restart_docker.log 2>&1

This will run the script every 5 minutes and log the output to /var/log/check_and_restart_docker.log.

  1. Save and Exit the Cron Job Editor:

Save the file and exit the editor (for nano, press Ctrl+X, then Y, and Enter).

This setup will ensure that the specified Docker container is checked every 5 minutes. If it is not running, it will kill any process using port 443 and restart the Docker container.