How do I install Pi-hole on a Synology NAS
This is a basic functional installation, it does not take into account any special servers/services that you may have running on your DSM. This was done succesfully on DSM 5.2-5967 and DSM 6.0.2-8451 Update 2. It uses Debian chroot to run Pi-hole and should take less than 30 minutes to install.
Install Chroot
In DSM:
- Add source: Package Center > Settings > Package Sources > add: http://packages.synocommunity.com/
- In Package Center > Community > Install Debian Chroot
Open a terminal/use putty, ssh to your NAS
On the command line, make sure you are root.
In DSM 6 use sudo su -
Login with your admin password:
/var/packages/debian-chroot/scripts/start-stop-status start
/var/packages/debian-chroot/scripts/start-stop-status chroot
You may receive a locale error, can be ignored - the prompt should have changed.
Now you are on the chroot prompt, which enables you to install many packages that are available for Debian.
Enter one by one:
apt-get update
apt-get upgrade
apt-get install locales
sed -i 's/^# *\(en_US.UTF-8\)/\1/' /etc/locale.gen && locale-gen
This may take a while (5-10 minutes depending on CPU speed)
dpkg-reconfigure tzdata
apt-get install curl
mount /proc
cat /proc/mounts > /etc/mtab
This is to fix a filesystem issue.
Install Pi-hole
curl -L https://install.pi-hole.net | bash
Just follow the steps...
The Pi-hole webserver runs on port 80, which is usually already occupied by the webserver, so we need to modify the webserver config:
nano /etc/lighttpd/lighttpd.conf
modify server.port = xxxx to a suitable port (higher than 1023)
ctrl+x to save
crontab /etc/cron.d/pihole
crontab -l
Verify that you see several entries for pihole.
sudo service cron restart
sudo service lighttpd restart
sudo service dnsmasq restart
This will restart the webserver, dnsmasq and cron with the new config.
Now you should be able to access it with your browser on http://ip:port/admin/
If you see the admin page of Pi-hole you can modify your devices: change the DNS IP address to the NAS IP.
Autostart after reboot
As nothing in chroot is started automatically we need to make a startup script that survives a reboot:
exit (from chroot - should still be root)
Retrieve the RC script - in this file it is assumed that you use /volume1:
cd;wget https://gist.githubusercontent.com/bakman2/dcfe3fdfd02c9ff8326bbf35da539f27/raw/c177d818b878ab2ee5c7de54af35116e0ded2a37/gistfile1.txt
mv gistfile1.txt /usr/local/etc/rc.d/S99pihole.sh
chmod +x /usr/local/etc/rc.d/S99pihole.sh
Test the script:
/usr/local/etc/rc.d/S99pihole.sh restart
If succesful, pi-hole and all the services should automatically start after a reboot.
Additional info:
If pi-hole does not work you can retry the install from chroot
curl -L https://install.pi-hole.net | bash
service dnsmasq restart
service lighttpd restart
To get into chroot from your dsm you can use /var/packages/debian-chroot/scripts/start-stop-status chroot
or to enable ssh in chroot, follow this blog post
If you are using dhcp in your network, configure your router to use the DNS on your NAS.
Update Pi-hole
from chroot:
pihole -up
change the webserver port again:
nano /etc/lighttpd/lighttpd.conf - change the port
ctrl+x y,enter to save
service lighttpd restart
service dnsmasq restart
thx.