Here is the script in Python:
``
python
import time
import subprocess
import yaml
import botocore
# Function to perform dynamic DNS update by calling cf-dyndns.sh bash shell
def update_dns(dry_run, output):
if dry_run:
return "NO_REPLY"
# Set shell variable for dyndns.sh script
subprocess.run(["which", "cf-dyndns.sh"])
# Run the script and capture output
run_output = subprocess.check_output(["./cf-dyndns.sh"], stderr=subprocess.STDOUT)
# Process output to check success or error
if "STATUS:NO_CHANGE" in str(run_output):
message = f'{time.asctime().replace(" ", "_")}DynDNS Error: [output]'
else:
if isinstance(output, list):
output = "\n".join(output)
message = f'{time.asctime().replace(" ", "_")} DynDNS Updated: {output}'
return message
# Run the script for demo purposes
print(update_dns(False, None))
`
Note that this code assumes that cf-dyndns.sh
is installed and available in your system's PATH. If you're running on a Linux or macOS machine and not familiar with setting up shell commands, here are some alternative steps:
* Make sure Docker is installed and running: docker run --rm docker:dalight
* Check if the script can run without issues by creating a temporary file using Bash (e.g., echo "Success!" > dyndns.txt; sudo chown -R $USER:$USER dyndns.txt
)
* Run the script with dry_run: Python script will still output something.
* Change to environment where you have shell access
To set up the environment, follow these steps for Docker:
1. Install Docker Desktop:
Go to [https://www.docker.com/en/docker-desktop/download](https://www.docker.com/en/docker-desktop.download)
2. Launch a new terminal session in your preferred Linux distribution (e.g., Ubuntu).
3. List available environments: docker ps
Set the default environment by using the following commands:
`
bash
# On Ubuntu-based systems, you can just run:
sudo docker info
`
**Environment variables**
You also want to set some environment variables that are not already in your current shell session.
1. **Set a new environment variable:** You can use Bash's export
command: export DYNO_DNS_USERNAME
for example.
2. **Run the script as root:** If you're planning some Docker-based deployment, you might need to run commands as root
(be careful with this as it opens shell access). For example:
`
bash
sudo -u docker bash /path/to/dyndns.sh
`
3. Verify environment variables:
After updating your current shell settings, verify that the environment variable is correctly set.
For example:
`
shell
export DYNO_DNS_USERNAME="your_username" # replace with actual username
`
Once you're sure everything is in order and you've verified DYNO_DNS_USERNAME`, run the Python script for the final demo.