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update readme

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Asif Bacchus 2021-05-10 03:18:49 -06:00
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README.md
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@ -111,6 +111,13 @@ # Cloudflare token for my.domain.tld
You can save the file as anything you like and anywhere you’d like as long as you inform the script of its location using the `--credentials` parameter. By default, the script will look for a file named *cloudflare.credentials* in the same path as the script.
Please remember that this file basically contains a password! As a result, it should be protected and access limited to the root account:
```bash
chown root:root /path/to/cloudflare.credentials
chmod 600 /path/to/cloudflare.credentials
```
### Bearer token
I chose to use an API bearer token instead of a username/password or Global API token for security reasons. Your username/password and Global API token provide unfettered access to your account so if anyone gets hold of them, they can do anything to your account. An API bearer token, by contrast, can only do what you authorize it to do and you can revoke it at any time. Therefore, I suggest making a bearer token that is based on the “Edit zone DNS” template and restricted to the specific domain/zone you wish to update. Cloudflare provides an [excellent article](https://support.cloudflare.com/hc/en-us/articles/200167836-Managing-API-Tokens-and-Keys) on how to generate this token.
@ -136,12 +143,6 @@ ## cfddns systemd service unit
...
````
Don’t forget to reload systemd after copying this file so it is recognized by the system! On most systems you can do this by running the following as root or via sudo:
```bash
systemctl daemon-reload
```
### IP4 or IP6
The cfddns.service file includes two *ExecStart* lines, one without a specified IP-protocol parameter (default IP4) and the other with the -6 (IP6) parameter. The service will run the cfddns.sh script in default (IP4) mode with specified parameters first and then will run the script again in IP6 mode with specified parameters.
@ -185,7 +186,7 @@ # update IP6 addresses
## cfddns systemd timer unit
This is the timer file that tells your system how often to call the *cfddns.service* file which runs the *cfddns.sh* script. By default, the timer is set for 5 minutes after the system boots up (to allow for other processes to initialize even on slower systems like a RasPi) and is then run every 15 minutes thereafter. Remember when setting your timer that Cloudflare limits API calls to 1200 every 5 minutes.
Just like the service file unit, this file **must** be copied to your */etc/systemd/system* directory (or equivalent directory if you're not running Debian/Ubuntu). This timer file unit tells your system how often to call the *cfddns.service* file which runs the *cfddns.sh* script. By default, the timer is set for 5 minutes after the system boots up (to allow for other processes to initialize even on slower systems like a RasPi) and is then run every 15 minutes thereafter. Remember when setting your timer that Cloudflare limits API calls to 1200 every 5 minutes.
You can change the timer by modifying the relevant section of the *cfddns.timer* file:
@ -198,6 +199,12 @@ ## cfddns systemd timer unit
*OnBootSec* is how long to wait after the system boots up before executing the *cfddns.service*. *OnUnitActiveSec* will then wait the specified time from that first (after boot) call or after the timer is explicitly started before calling *cfddns.service* again. I recommend setting OnUnitActiveSec to a low value (like 2 minutes) for testing then setting it to a more reasonable time (like 15
minutes) after everything is working.
After you’ve copied both the systemd unit and this timer unit, don’t forget to reload the systemd daemon so they are recognized by the system! On most systems you can do this by running the following as root or via sudo:
```bash
systemctl daemon-reload
```
### Activation
You can start the timer system immediately via *systemctl*
@ -220,6 +227,8 @@ ### Activation
It is NOT necessary to enable/start the *cfddns.service*, only the timer needs to be active.
Also remember that if you make changes to settings like `OnUnitActiveSec` while testing or after testing is complete you *must* reload the systemd daemon! It will restart the appropriate units for you and your new settings will take effect immediately.
## Logging
The script logs every major action it takes and provides details on any errors it encounters in the log file (see the [parameters section](#parameters) for details about setting log location and name). If errors are encountered, they are colour coded red and an explanation of the error code is provided.