Amargius_Commons/porkbun_ddns_script
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KacperLa 2025-11-24 13:17:00 -05:00
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README.md
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@ -41,9 +41,8 @@ SECRET_KEY=sk1_your_secret_key_here
# Required: The domain to update
DOMAIN=example.com
# Required for multi-machine setup: Unique identifier for this machine
# Each machine should have a different MACHINE_ID
MACHINE_ID=server1
# Required: Name of the machine for tracking
MACHINE_ID="exmample_machine"
```
### Getting Porkbun API Credentials
@ -149,24 +148,6 @@ This means:
- If you ever want to manually take control of a record that was created by this script,
you can remove or change the `ddns:<MACHINE_ID>` note and the script will stop managing it.
### Automated Updates with Cron
To automatically update DNS every 5 minutes:
```bash
crontab -e
```
Add this line (adjust path as needed):
```cron
*/5 * * * * /home/user/porkbun/updateDNS.sh >> /var/log/porkbun-ddns.log 2>&1
```
Or every hour:
```cron
0 * * * * /home/user/porkbun/updateDNS.sh >> /var/log/porkbun-ddns.log 2>&1
```
## Dry-run mode
You can run the script in **dry-run** mode to see what it would do without actually
@ -188,6 +169,135 @@ In dry-run mode:
This is useful when first configuring the script or making changes to your DNS setup,
so you can verify behavior before applying it.
## Systemd integration helpers
This repository also includes helper scripts to install the updater as a systemd service,
uninstall it cleanly, and view logs more easily.
### `install.sh` – install systemd timer + service
`install.sh` sets up a `porkbun-ddns` systemd service and timer that will run
`updateDNS.sh` for you on a schedule (default: every 5 minutes).
What it does:
- Verifies required files exist in the current directory:
- `updateDNS.sh`
- `.env`
- `porkbun-ddns.service`
- `porkbun-ddns.timer`
- Ensures `updateDNS.sh` is executable.
- Checks for required dependencies: `curl`, `jq`, `systemctl`.
- Validates that `.env` contains `API_KEY`, `SECRET_KEY`, `DOMAIN`, and `MACHINE_ID`.
- Runs `updateDNS.sh` once as a test (with your current config).
- Installs and enables:
- `/etc/systemd/system/porkbun-ddns.service`
- `/etc/systemd/system/porkbun-ddns.timer`
- Starts the timer and shows its status.
Usage:
```bash
cd /path/to/porkbun
./install.sh
```
Notes:
- Do **not** run `install.sh` directly as root; it will use `sudo` when needed.
- The service runs as the current user (it rewrites `User=` and `Group=` in
the service file to match who ran `install.sh`).
After installation, some useful commands:
```bash
systemctl status porkbun-ddns.timer
systemctl status porkbun-ddns.service
journalctl -u porkbun-ddns.service -n 50
```
### `uninstall.sh` – remove systemd timer + service
`uninstall.sh` cleanly removes the `porkbun-ddns` systemd units while leaving your
scripts and configuration files intact.
What it does:
- Stops `porkbun-ddns.timer` and `porkbun-ddns.service` if they are running.
- Disables the timer so it no longer starts at boot.
- Removes `/etc/systemd/system/porkbun-ddns.service` and
`/etc/systemd/system/porkbun-ddns.timer`.
- Reloads systemd and resets any failed state for these units.
Usage:
```bash
cd /path/to/porkbun
./uninstall.sh
```
Notes:
- Do **not** run `uninstall.sh` as root; it will use `sudo` for systemd operations.
- Your local files remain:
- `updateDNS.sh`
- `.env`
- `porkbun-ddns.service`
- `porkbun-ddns.timer`
so you can reinstall later with `./install.sh`.
### `logs.sh` – convenient log viewer
`logs.sh` is a small wrapper around `journalctl` and `systemctl` to make it easier
to inspect the `porkbun-ddns.service` logs and status.
Basic usage (show last 50 lines):
```bash
cd /path/to/porkbun
./logs.sh
```
Common options:
- Follow logs in real-time (like `tail -f`):
```bash
./logs.sh -f
```
- Show last N lines:
```bash
./logs.sh -n 100
```
- Show logs from today only:
```bash
./logs.sh -t
```
- Show logs from the last hour:
```bash
./logs.sh -h
```
- Show only error messages:
```bash
./logs.sh -e
```
- Show service and timer status plus recent runs:
```bash
./logs.sh -s
```
Run `./logs.sh --help` for the full list of options.
## How It Works
1. **Load Configuration** - Reads API credentials and settings from `.env`
@ -195,13 +305,12 @@ so you can verify behavior before applying it.
3. **Retrieve DNS Records** - Gets all existing DNS records for the domain and displays them
4. **Check for Duplicates** - Detects if multiple records exist for this machine ID
5. **Skip if Unchanged** - If IP matches and exactly one record exists, skips update
6. **Clean Old Records** - Deletes A/ALIAS/CNAME records with no machine ID (migration cleanup)
7. **Delete Own Records** - Removes this machine's previous A records (by matching notes field)
8. **Verify Cleanup** - Ensures all old records were deleted before creating new ones
9. **Create New Record** - Adds fresh A record with current IP and machine ID in notes
10. **Verify Creation** - Confirms exactly one record exists for this machine
6. **Delete Own Records** - Removes this machine's previous A records (by matching notes field)
7. **Verify Cleanup** - Ensures all old records were deleted before creating new ones
8. **Create New Record** - Adds fresh A record with current IP and machine ID in notes
9. **Verify Creation** - Confirms exactly one record exists for this machine
> Note: The script now only deletes and verifies records that it manages
> Note: The script only deletes and verifies records that it manages
> (those whose notes are exactly `ddns:<MACHINE_ID>`). Other records in the
> same zone are left untouched.
@ -228,18 +337,9 @@ so you can verify behavior before applying it.
1. **Immediately revoke** the API keys in your Porkbun account
2. **Generate new keys** and update your `.env` file
3. **Remove secrets from git history** if they were committed:
```bash
git filter-branch --force --index-filter \
"git rm --cached --ignore-unmatch .env" \
--prune-empty --tag-name-filter cat -- --all
```
## Troubleshooting
### Error: "dig: command not found"
The script now uses `curl` instead of `dig`, so this shouldn't happen. If you see this, update to the latest version.
### Error: "API access not enabled"
1. Log in to Porkbun
2. Go to your domain settings
@ -258,7 +358,7 @@ The script now uses `curl` instead of `dig`, so this shouldn't happen. If you se
- Check DNS records in Porkbun dashboard to see notes field (look for `ddns:<MACHINE_ID>`)
### IP not updating
- Check script is running (add to cron for automatic updates)
- Check script is running
- Verify your public IP actually changed
- Check Porkbun API status
- Review logs for error messages
@ -278,23 +378,23 @@ Example output with the new structured logging format:
Mon Nov 24 12:04:38 PM EST 2025 [INFO] Using environment file: /home/user/porkbun/.env
IP source: Porkbun API (/ping)
Mon Nov 24 12:04:38 PM EST 2025 [INFO] Current Public IP: 45.73.134.145
Mon Nov 24 12:04:38 PM EST 2025 [INFO] Machine ID: KACPER_NIX
Mon Nov 24 12:04:38 PM EST 2025 [INFO] Domain: aksal.cloud
Mon Nov 24 12:04:38 PM EST 2025 [INFO] Machine ID: EXAMPLE_MACHINE
Mon Nov 24 12:04:38 PM EST 2025 [INFO] Domain: example.com
Mon Nov 24 12:04:38 PM EST 2025 [INFO] Processing DNS record for: aksal.cloud (IP: 45.73.134.145)
Mon Nov 24 12:04:38 PM EST 2025 [INFO] Machine ID: KACPER_NIX
Mon Nov 24 12:04:39 PM EST 2025 [INFO] Existing records for FQDN 'aksal.cloud':
Type: A, Name: aksal.cloud, Content: 45.73.134.145, Notes: ddns:KACPER_NIX, Managed: true, ID: 508029248
Type: NS, Name: aksal.cloud, Content: curitiba.porkbun.com, Notes: none, Managed: false, ID: 506591857
Type: NS, Name: aksal.cloud, Content: fortaleza.porkbun.com, Notes: none, Managed: false, ID: 506591856
Type: NS, Name: aksal.cloud, Content: maceio.porkbun.com, Notes: none, Managed: false, ID: 506591854
Type: NS, Name: aksal.cloud, Content: salvador.porkbun.com, Notes: none, Managed: false, ID: 506591855
Mon Nov 24 12:04:38 PM EST 2025 [INFO] Processing DNS record for: example.com (IP: 45.73.134.145)
Mon Nov 24 12:04:38 PM EST 2025 [INFO] Machine ID: EXAMPLE_MACHINE
Mon Nov 24 12:04:39 PM EST 2025 [INFO] Existing records for FQDN 'example.com':
Type: A, Name: example.com, Content: 45.73.134.145, Notes: ddns:EXAMPLE_MACHINE, Managed: true, ID: 508029248
Type: NS, Name: example.com, Content: curitiba.porkbun.com, Notes: none, Managed: false, ID: 506591857
Type: NS, Name: example.com, Content: fortaleza.porkbun.com, Notes: none, Managed: false, ID: 506591856
Type: NS, Name: example.com, Content: maceio.porkbun.com, Notes: none, Managed: false, ID: 506591854
Type: NS, Name: example.com, Content: salvador.porkbun.com, Notes: none, Managed: false, ID: 506591855
Mon Nov 24 12:04:39 PM EST 2025 [INFO] Record already exists with correct IP (45.73.134.145). No update needed.
Mon Nov 24 12:04:39 PM EST 2025 [INFO] Processing DNS record for: *.aksal.cloud (IP: 45.73.134.145)
Mon Nov 24 12:04:39 PM EST 2025 [INFO] Machine ID: KACPER_NIX
Mon Nov 24 12:04:40 PM EST 2025 [INFO] Existing records for FQDN '*.aksal.cloud':
Type: A, Name: *.aksal.cloud, Content: 45.73.134.145, Notes: ddns:KACPER_NIX, Managed: true, ID: 508029259
Mon Nov 24 12:04:39 PM EST 2025 [INFO] Processing DNS record for: *.example.com (IP: 45.73.134.145)
Mon Nov 24 12:04:39 PM EST 2025 [INFO] Machine ID: EXAMPLE_MACHINE
Mon Nov 24 12:04:40 PM EST 2025 [INFO] Existing records for FQDN '*.example.com':
Type: A, Name: *.example.com, Content: 45.73.134.145, Notes: ddns:EXAMPLE_MACHINE, Managed: true, ID: 508029259
Mon Nov 24 12:04:40 PM EST 2025 [INFO] Record already exists with correct IP (45.73.134.145). No update needed.
Mon Nov 24 12:04:40 PM EST 2025 [INFO] DNS update completed successfully
@ -310,18 +410,9 @@ Mon Nov 24 12:04:40 PM EST 2025 [INFO] DNS update completed successfully
This script is provided as-is for use with Porkbun DNS services.
## Support
For issues with:
- **This script**: Open an issue or review the code
- **Porkbun API**: Contact [Porkbun Support](https://porkbun.com/support)
- **DNS concepts**: See [Porkbun DNS Documentation](https://kb.porkbun.com/)
## Contributing
Improvements welcome! Consider adding:
- IPv6 support (AAAA records)
- Email notifications on IP change
- Systemd service file
- Docker container version
- Health check endpoint
- Health check endpoint