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Pi-hole in Docker on ReadyNAS

If you use ReadyNAS OS 6 you can install Pi-hole in Docker container:

docker run --name my-new-pi-hole \
     -e ServerIP=191.168.1.28 \
     -e DNS1=192.168.1.4 \
     -e WEBPASSWORD=secret \
     -d \
     -p 8080:80 -p 53:53 -p 53:53/udp \
     diginc/pi-hole

you don't have to run

docker pull diginc/pi-hole

it will be done automatic (or rather automagic).

As You can see I've set up several parameters:

  • run is command to docker to run container
  • --name my-new-pi-hole is name of container (optional)
  • -e means Environment Variable - it is to pass some options to container
    • ServerIP - it is IP that Pi-hole should use (mandatory)
    • DNS1 - IP of your DNS server (optional) - if you not provide it will use google's DNS
    • WEBPASSWORD (useful) - you will need it to login to administration portal
  • -d - tells to docker that this container should work in background
  • -p - is port redirection from your docker machine to port in container
    • 8080:80 (useful) - is redirection of 8080 port of your docker machine to port 80 in container
    • 53:53 (optional)- is redirection of 53 port of your docker machine to port 53 in container (not necessary in my case)
    • 53:53/udp (very useful) - is the same for UDP port - this is what we need to work
  • diginc/pi-hole - is of course name of image to run

Now you can use command

docker ps

to get some information about your container

CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS                            PORTS                                                          NAMES
891aeb2c127b        diginc/pi-hole      "/s6-init"          7 seconds ago       Up 2 seconds (health: starting)   0.0.0.0:53->53/tcp, 0.0.0.0:53->53/udp, 0.0.0.0:8080->80/tcp   my-new-pi-hole

as you can see status is health: starting, after some time it will change to healthy.

Now you can login to (192.168.1.28 is address of may docker machine) http://192.168.1.28:8080/admin/ to check that no one has used your server (Total queries 0).

Let's check if it works:

root@mynas:~# host jaqb.gda.pl 192.168.1.28
Using domain server:
Name: 192.168.1.28
Address: 192.168.1.28#53
Aliases:

jaqb.gda.pl has address 185.204.216.106
jaqb.gda.pl mail is handled by 0 mail.jaqb.gda.pl.

Yes!

Now it's enough to change default DNS in your LAN to your docker machine (in my case 192.168.1.28).

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