A [Docker](https://www.docker.com/what-docker) project to make a lightweight x86 and ARM container with [Pi-hole](https://pi-hole.net) functionality.
1) Install docker for your [x86-64 system](https://www.docker.com/community-edition) or [ARMv7 system](https://www.raspberrypi.org/blog/docker-comes-to-raspberry-pi/) using those links.
This container uses 2 popular ports, port 53 and port 80, so **may conflict with existing applications ports**. If you have no other services or docker containers using port 53/80 (if you do, keep reading below for a reverse proxy example), the minimum arguments required to run this container are in the script [docker_run.sh](https://github.com/pi-hole/docker-pi-hole/blob/master/docker_run.sh) or summarized here:
**This is just an example and might need changing.** Volumes are stored in the directory `$DOCKER_CONFIGS` and are recommended for persisting data across docker re-creations for updating images. The IP lookup variables may not work for everyone, please review their values and hard code IP and IPv6 if necessary.
Two recently added ports to the `docker run` and `docker-compose` examples are port 67 and 443. Port 67 is for users who wish to have Pi-hole run a DHCP server. Port 443 is to provide a sinkhole for ads that use SSL. If only port 80 is used, then blocked HTTPS queries will fail to connect to port 443 and may cause long loading times. Rejecting 443 on your firewall can also serve this same purpose. Ubuntu firewall example: `sudo ufw reject https`
**Automatic Ad List Updates** - since the 3.0+ release, `cron` is baked into the container and will grab the newest versions of your lists and flush your logs. **Set your TZ** environment variable to make sure the midnight log rotation syncs up with your timezone's midnight.
| `-e TZ=<Timezone>`<br/>**Recommended***Default: UTC* | Set your [timezone](https://en.wikipedia.org/wiki/List_of_tz_database_time_zones) to make sure logs rotate at local midnight instead of at UTC midnight.
| `-e WEBPASSWORD=<Admin password>`<br/>**Recommended***Default: random* | http://pi.hole/admin password. Run `docker logs pihole \| grep random` to find your random pass.
| `-e VIRTUAL_HOST=<Custom Hostname>`<br/>*Optional**Default: $ServerIP* | What your web server 'virtual host' is, accessing admin through this Hostname/IP allows you to make changes to the whitelist / blacklists in addition to the default 'http://pi.hole/admin/' address
| `-e IPv6=<True\|False>`<br/>*Optional**Default: True* | For unraid compatibility, strips out all the IPv6 configuration from DNS/Web services when false.
| `-e INTERFACE=<NIC>`<br/>*Advanced/Optional* | The default works fine with our basic example docker run commands. If you're trying to use DHCP with `--net host` mode then you may have to customize this or DNSMASQ_LISTENING.
| `-e DNSMASQ_LISTENING=<local\|all\|NIC>`<br/>*Advanced/Optional* | `local` listens on all local subnets, `all` permits listening on internet origin subnets in addition to local.
| `-e WEB_PORT=<PORT>`<br/>*Advanced/Optional* | **This will break the 'webpage blocked' functionality of Pi-hole** however it may help advanced setups like those running synology or `--net=host` docker argument. This guide explains how to restore webpage blocked functionality using a linux router DNAT rule: [Alternative Synology installation method](https://discourse.pi-hole.net/t/alternative-synology-installation-method/5454?u=diginc)
| `-v /dir/for/dnsmasq.d:/etc/dnsmasq.d`<br/>**Recommended** | Volumes for your dnsmasq configs help persist changes across docker image updates
| `--net=host`<br/>*Optional* | Alternative to `-p <port>:<port>` arguments (Cannot be used at same time as -p) if you don't run any other web application
| `--cap-add=NET_ADMIN`<br/>*Optional* | If you're forwarding port 67 you will also needs this for DHCP to work. (DHCP Reportedly works, I have not used however)
| `--dns=127.0.0.1`<br/>*Recommended* | Sets your container's resolve settings to localhost so it can resolve DHCP hostnames from Pi-hole's DNSMasq <!-- also fixes common resolution errors on container restart -->
| `--dns=1.1.1.1`<br/>*Optional* | Sets a backup server of your choosing in case DNSMasq has problems starting
If you're a fan of [docker-compose](https://docs.docker.com/compose/install/) I have [example docker-compose.yml files](https://github.com/pi-hole/docker-pi-hole/blob/master/doco-example.yml) in github which I think are a nicer way to represent such long run commands.
* 17.10 should disable systemd-resolved service. See this page: [How to disable systemd-resolved in Ubuntu](https://askubuntu.com/questions/907246/how-to-disable-systemd-resolved-in-ubuntu)
* Port 80 is highly recommended because if you have another site/service using port 80 by default then the ads may not transform into blank ads correctly. To make sure docker-pi-hole plays nicely with an existing webserver you run you'll probably need a reverse proxy webserver config if you don't have one already. Pi-hole must be the default web app on the proxy e.g. if you go to your host by IP instead of domain then Pi-hole is served out instead of any other sites hosted by the proxy. This is the '[default_server](http://nginx.org/en/docs/http/ngx_http_core_module.html#listen)' in nginx or ['_default_' virtual host](https://httpd.apache.org/docs/2.4/vhosts/examples.html#default) in Apache and is taken advantage of so any undefined ad domain can be directed to your webserver and get a 'blocked' response instead of ads.
* You can still map other ports to Pi-hole port 80 using docker's port forwarding like this `-p 8080:80`, but again the ads won't render properly. Changing the inner port 80 shouldn't be required unless you run docker host networking mode.
* [Here is an example of running with jwilder/proxy](https://github.com/pi-hole/docker-pi-hole/blob/master/jwilder-proxy-example-doco.yml) (an nginx auto-configuring docker reverse proxy for docker) on my port 80 with Pi-hole on another port. Pi-hole needs to be `DEFAULT_HOST` env in jwilder/proxy and you need to set the matching `VIRTUAL_HOST` for the Pi-hole's container. Please read jwilder/proxy readme for more info if you have trouble. I tested this basic example which is based off what I run.
The primary docker tags / versions are explained in the following table. [Click here to see the full list of tags](https://store.docker.com/community/images/pihole/pihole/tags) ([arm tags are here](https://store.docker.com/community/images/pihole/pihole/tags)), I also try to tag with the specific version of Pi-hole Core for version archival purposes, the web version that comes with the core releases should be in the [GitHub Release notes](https://github.com/pi-hole/docker-pi-hole/releases).
| `latest` | auto detect | x86, arm, or arm64 container, docker auto detects your architecture. | [Dockerfile](https://github.com/pi-hole/docker-pi-hole/blob/master/Dockerfile_amd64) |
| `v4.0.0-1` | auto detect | Versioned tags, if you want to pin against a specific version, use one of thesse | |
| `v4.0.0-1_<arch>` | based on tag | Specific architectures tags | |
### `pihole/pihole:latest` [](https://microbadger.com/images/pihole/pihole "Get your own image badge on microbadger.com") [](https://microbadger.com/images/pihole/pihole "Get your own version badge on microbadger.com") [](https://microbadger.com/images/pihole/pihole "Get your own version badge on microbadger.com")
This version of the docker aims to be as close to a standard Pi-hole installation by using the recommended base OS and the exact configs and scripts (minimally modified to get them working). This enables fast updating when an update comes from Pi-hole.
The standard Pi-hole customization abilities apply to this docker, but with docker twists such as using docker volume mounts to map host stored file configurations over the container defaults. Volumes are also important to persist the configuration in case you have removed the Pi-hole container which is a typical docker upgrade pattern.
Do not attempt to upgrade (`pihole -up`) or reconfigure (`pihole -r`). New images will be released for upgrades, upgrading by replacing your old container with a fresh upgraded image is the 'docker way'. Long-living docker containers are not the docker way since they aim to be portable and reproducible, why not re-create them often! Just to prove you can.
* **Warning** When removing your pihole container you may be stuck without DNS until step 3; **docker pull** before **docker rm -f** to avoid DNS inturruption **OR** always have a fallback DNS server configured in DHCP to avoid this problem altogether.
* If you care about your data (logs/customizations), make sure you have it volume-mapped or it will be deleted in this step.
Why is this style of upgrading good? A couple reasons: Everyone is starting from the same base image which has been tested to known it works. No worrying about upgrading from A to B, B to C, or A to C is required when rolling out updates, it reducing complexity, and simply allows a 'fresh start' every time while preserving customizations with volumes. Basically I'm encouraging [phoenix server](https://www.google.com/?q=phoenix+servers) principles for your containers.
To reconfigure Pi-hole you'll either need to use an existing container environment variables or if there is no a variable for what you need, use the web UI or CLI commands.
Here are some relevant wiki pages from [Pi-hole's documentation](https://github.com/pi-hole/pi-hole/blob/master/README.md#get-help-or-connect-with-us-on-the-web). The web interface or command line tools can be used to implement changes to pihole.
We install all pihole utilities so the the built in [pihole commands](https://discourse.pi-hole.net/t/the-pihole-command-with-examples/738) will work via `docker exec <container> <command>` like so:
The webserver and DNS service inside the container can be customized if necessary. Any configuration files you volume mount into `/etc/dnsmasq.d/` will be loaded by dnsmasq when the container starts or restarts or if you need to modify the Pi-hole config it is located at `/etc/dnsmasq.d/01-pihole.conf`. The docker start scripts runs a config test prior to starting so it will tell you about any errors in the docker log.
As long as your docker system service auto starts on boot and you run your container with `--restart=unless-stopped` your container should always start on boot and restart on crashes. If you prefer to have your docker container run as a systemd service instead, add the file [pihole.service](https://raw.githubusercontent.com/pi-hole/docker-pi-hole/master/pihole.service) to "/etc/systemd/system"; customize whatever your container name is and remove `--restart=unless-stopped` from your docker run. Then after you have initially created the docker container using the docker run command above, you can control it with "systemctl start pihole" or "systemctl stop pihole" (instead of `docker start`/`docker stop`). You can also enable it to auto-start on boot with "systemctl enable pihole" (as opposed to `--restart=unless-stopped` and making sure docker service auto-starts on boot).
NOTE: After initial run you may need to manually stop the docker container with "docker stop pihole" before the systemctl can start controlling the container.
Please report issues on the [GitHub project](https://github.com/pi-hole/docker-pi-hole) when you suspect something docker related. Pi-hole or general docker questions are best answered on our [user forums](https://github.com/pi-hole/pi-hole/blob/master/README.md#get-help-or-connect-with-us-on-the-web). Ping me (@diginc) on the forums if it's a docker container and you're not sure if it's docker related.
