update post about DStarGateway with "Updating hostfiles"

content/posts/2024/62-a-slim-dstar-gateway-on-a-raspberry-pi-2/index.md

@@ -582,6 +582,58 @@ pidfile=/var/run/dstargateway/dstargateway.pid
 user=dstar
 ~~~
 
+## Updating hostfiles
+
+{{< alert "circle-info" >}}
+This paragraph has been added on 18 Feb 2024
+{{< /alert >}}
+
+So we will probably update our hostfiles and I made a little script that
+fetches actual hostfiles from trusted sources. But since Archlinux does not
+come with any cron installed I could either install one or just use systemd timers.
+
+I went with the latter one of the options and assuming the script that updates the hostfiles
+is located in `/home/dominic/bin/update-hosts.sh` I used these unit-files that I put into
+`/usr/lib/systemd/system/`:
+
+### update-hosts.service
+
+~~~systemd
+[Unit]
+Description="Update D-STAR hostfiles"
+After=network.target
+
+[Service]
+Type=oneshot
+ExecStart=/home/dominic/bin/update-hosts.sh
+ExecStartPost=/usr/bin/systemctl restart dstargateway.service
+
+[Install]
+WantedBy=default.target
+~~~
+
+### update-hosts.timer
+
+~~~systemd
+[Unit]
+Description="Update D-STAR hostfiles timer"
+
+[Timer]
+OnBootSec=5min
+OnCalendar=daily
+RandomizedDelaySec=20min
+Unit=update-hosts.service
+
+[Install]
+WantedBy=default.target
+~~~
+
+Enable the timer and it will run now and daily in future.
+
+~~~console
+$ sudo systemctl enable --now update-hosts.timer
+~~~
+
 ## Install a dashboard
 
 I will install the [dashboard from John Hays (K7VE)](https://github.com/johnhays/dsgwdashboard)