Pdns recursor (#6)

* Adding pdns recursor

* Adding pdns recursor with fedora

* pdns resolver version correction

* Update readme for pdns-recursor

README.md

@@ -1,6 +1,6 @@
 # PowerDNS Docker Images
 
-This repository contains four Docker images - pdns-mysql, pdns-admin-static, pdns-admin-uwsgi and deprecated pdns-admin. Image **pdns-mysql** contains completely configurable [PowerDNS 4.x server](https://www.powerdns.com/) with mysql backend (without mysql server). Images **pdns-admin-static** and **pdns-admin-uwsgi** contains fronted (nginx) and backend (uWSGI) for [PowerDNS Admin](https://git.0x97.io/0x97/powerdns-admin) web app, written in Flask, for managing PowerDNS servers. Pdns-admin is also completely configurable. Deprecated **pdns-admin** contains PowerDNS Admin in a single image where both nginx and uWSGI processes are managed by systemd. This image won't be updated anymore.
+This repository contains five Docker images - pdns-mysql, pdns-admin-static, pdns-admin-uwsgi, pdns-recursor and deprecated pdns-admin. Image **pdns-mysql** contains completely configurable [PowerDNS 4.x server](https://www.powerdns.com/) with mysql backend (without mysql server). Image **pdns-recursor** contains completely configurable [PowerDNS 4.x recursor](https://www.powerdns.com/). Images **pdns-admin-static** and **pdns-admin-uwsgi** contains fronted (nginx) and backend (uWSGI) for [PowerDNS Admin](https://git.0x97.io/0x97/powerdns-admin) web app, written in Flask, for managing PowerDNS servers. Pdns-admin is also completely configurable. Deprecated **pdns-admin** contains PowerDNS Admin in a single image where both nginx and uWSGI processes are managed by systemd. This image won't be updated anymore.
 
 All images are available on Docker Hub:
 
@@ -146,6 +146,31 @@ docker run -d -p 8080:80 --name pdns-admin-static \
   pschiffe/pdns-admin-static
 ```
 
+## pdns-recursor
+
+[![](https://images.microbadger.com/badges/image/pschiffe/pdns-recursor.svg)](http://microbadger.com/images/pschiffe/pdns-recursor "Get your own image badge on microbadger.com")
+
+https://hub.docker.com/r/pschiffe/pdns-recursor/
+
+Docker image with [PowerDNS 4.x recursor](https://www.powerdns.com/). 
+
+PowerDNS recursor is configurable via env vars. Every variable starting with `PDNS_` will be inserted into `/etc/pdns/recursor.conf` conf file in the following way: prefix `PDNS_` will be stripped and every `_` will be replaced with `-`. For example, from above mysql config, `PDNS_gmysql_host=mysql` will became `gmysql-host=mysql` in `/etc/pdns/recursor.conf` file. This way, you can configure PowerDNS recursor any way you need within a `docker run` command.
+
+You can find [here](https://doc.powerdns.com/md/recursor/settings/) all available settings.
+
+### Examples
+
+Recursor server with API enabled:
+```
+docker run -d -p 53:53 -p 53:53/udp --name pdns-recursor \
+  -e PDNS_api=yes \
+  -e PDNS_api_key=secret \
+  -e PDNS_webserver=yes \
+  -e PDNS_webserver_address=0.0.0.0 \
+  -e PDNS_webserver_password=secret2 \
+  pschiffe/pdns-recursor
+```
+
 ## pdns-admin - DEPRECATED
 
 [![](https://images.microbadger.com/badges/image/pschiffe/pdns-admin.svg)](http://microbadger.com/images/pschiffe/pdns-admin "Get your own image badge on microbadger.com")

pdns-recursor/Dockerfile

@@ -0,0 +1,22 @@
+FROM fedora:27
+MAINTAINER "Peter Schiffer" <pschiffe@redhat.com>
+
+RUN sed -i '/tsflags=nodocs/d' /etc/dnf/dnf.conf \
+  && dnf -y --setopt=install_weak_deps=False install \
+    pdns-recursor \
+  && dnf clean all
+
+RUN pip3 install envtpl \
+  && rm -rf ~/.cache/*
+
+ENV VERSION=4.0.6 \
+  PDNS_setuid=recursor \
+  PDNS_setgid=recursor \
+  PDNS_daemon=no
+
+EXPOSE 53 53/udp
+
+COPY recursor.conf.tpl /
+COPY docker-cmd.sh /
+
+CMD [ "/docker-cmd.sh" ]

pdns-recursor/Dockerfile.alpine

@@ -0,0 +1,22 @@
+FROM alpine:3.7
+MAINTAINER "Peter Schiffer" <pschiffe@redhat.com>
+  
+RUN set -xe \
+	&& apk update --no-cache && apk upgrade --no-cache \
+	&& apk add --update --no-cache pdns-recursor python3 \
+	&& rm -rf /var/cache/apk/*
+
+RUN pip3 install envtpl \
+  && rm -rf ~/.cache/*
+
+ENV VERSION=4.0.6 \
+  PDNS_setuid=recursor \
+  PDNS_setgid=recursor \
+  PDNS_daemon=no
+
+EXPOSE 53 53/udp
+
+COPY recursor.conf.tpl /
+COPY docker-cmd.sh /
+
+CMD [ "/docker-cmd.sh" ]

pdns-recursor/docker-cmd.sh

@@ -0,0 +1,14 @@
+#!/bin/sh
+
+set -euo pipefail
+
+# Configure base vars
+: "${PDNS_local_port:=53}"
+: "${PDNS_local_address:=0.0.0.0}"
+
+export PDNS_local_port PDNS_local_address
+
+# Create config file from template
+envtpl < /recursor.conf.tpl > /etc/pdns/recursor.conf
+
+exec /usr/sbin/pdns_recursor

pdns-recursor/recursor.conf.tpl

@@ -0,0 +1,2 @@
+{% for key, value in environment('PDNS_') %}{{ key|replace('_', '-') }}={{ value }}
+{% endfor %}