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Systemd timer setup documentation
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@ -144,6 +144,9 @@ to enter and save your credentials. Now you can run `pihole-cloudsync` unattende
Again, **the above steps must be performed on each Pi-hole you wish to use with `pihole-cloudsync`.** Again, **the above steps must be performed on each Pi-hole you wish to use with `pihole-cloudsync`.**
# Automation
There are two options for automating unattended runs of pihole-cloudsync, [cron](#Automating-with-cron) and [systemd](#Automating-with-systemd). See below for details or use the links to skip right to your desired section
## Automating with cron ## Automating with cron
Once each Pi-hole's local Git repo has been configured to save your login credentials, you can automate your Primary Pi-hole's "push" and your Secondary Pi-holes' "pull" in any number of ways. The simplest way is to run a simple cron job a few times a day. Once each Pi-hole's local Git repo has been configured to save your login credentials, you can automate your Primary Pi-hole's "push" and your Secondary Pi-holes' "pull" in any number of ways. The simplest way is to run a simple cron job a few times a day.
@ -157,5 +160,62 @@ And once you can successfully run `pihole-cloudsync --pull` from the command lin
**NOTE:** On Raspian, the script won't execute via cron without the `sudo` command (as shown above). If you're having trouble getting the script to run unattended on Raspian, try including `sudo` in the cron command. **NOTE:** On Raspian, the script won't execute via cron without the `sudo` command (as shown above). If you're having trouble getting the script to run unattended on Raspian, try including `sudo` in the cron command.
## Automating with systemd
pihole-cloudsync pulls can be automated fairly easily with systemd, given your distro runs it. Once you can successfully run `pihole-cloudsync --pull` from the command line on each of your Secondary Pi-holes, you may proceed with systemd setup. There are three files you must install in order to ensure a stable and non-intrusve update process: The _.service_, the _.timer_, and the _.slice_.
### Quick Start
1. Copy the each of the three unit files in the "Details" section below into `/etc/systemd/system` on your machine
2. Tell systemd we changed its configuration files: `systemctl daemon-reload`
3. Enable and start the service/timer
```bash
# Enable the relevant configs
systemctl enable pihole-cloudsync-update.service
systemctl enable pihole-cloudsync-update.timer
# Start the timer
systemctl start pihole-cloudsync-update.timer
```
### Details
1. **.service** - `/etc/systemd/system/pihole-cloudsync-update.service` - The core service file. Configured as a 'oneshot' in order to be run via a [systemd timer](https://wiki.archlinux.org/index.php/Systemd/Timers)
```ini
[Unit]
Description=PiHole Cloud Sync Data Puller service
Wants=pihole-cloudsync-update.timer
[Service]
Type=oneshot
ExecStart=/usr/local/bin/pihole-cloudsync --pull
Slice=pihole-cloudsync-update.slice
[Install]
WantedBy=multi-user.target
```
2. **.timer** - `/etc/systemd/system/pihole-cloudsync-update.timer` - The timer file. Determines when the _.service_ file is executed. Systemd timers are highly flexible and can be executed under a variety of timed and trigger-based circumstances. The [ArchLinux systemd/Timer documentation](https://wiki.archlinux.org/index.php/Systemd/Timers) is some of the best around. See their [examples](https://wiki.archlinux.org/index.php/Systemd/Timers#Examples) for many more ways to configure this systemd timer unit
```ini
[Unit]
Description=PiHole Cloud Synd Data Puller timer
Requires=pihole-cloudsync-update.service
[Timer]
Unit=pihole-cloudsync-update.service
OnBootSec=15
OnUnitActiveSec=1h
[Install]
WantedBy=timers.target
```
3. **.slice** - `/etc/systemd/system/pihole-cloudsync-update.slice` - The slice file. Determines how much of the total system resources the _.service_ is allowed to consume. Since PiHole is a DNS server and we humans like the internet to be as snappy as possible, this slice is put in to keep the update process in check and ensure that there will always be _plenty_ of room for the PiHole sevice to operate and answer queries without being obstructed by pihole-cloudsync updates. If you'd like to know more about systemd slices, check out [this wiki page](https://wikitech.wikimedia.org/wiki/Systemd_resource_control) for details
```ini
[Unit]
Description=PiHole Cloud Sync Puller resource limiter slice
Before=slices.target
[Slice]
CPUQuota=50%
```
# Disclaimer # Disclaimer
You are totally responsible for anything this script does to your system. Whether it launches a nice game of Tic Tac Toe or global thermonuclear war, you're on your own. :) You are totally responsible for anything this script does to your system. Whether it launches a nice game of Tic Tac Toe or global thermonuclear war, you're on your own. :)