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--- docker_notes:docker-dns [2023-11-22 Wed wk47 10:31] – [Docker - DNS Server] baumkp
+++ docker_notes:docker-dns [2024-05-12 Sun wk19 11:29] (current) – [docker compose] baumkp
@@ Line 1: / Line 1: @@
 {{tag>linux docker DNS bind9}}
 ======Docker - DNS Server======
-I propose to create a Docker Bind9 Image using base Docker Alpine Linux images, with S6 init system.
+[[https://www.hostinger.com/tutorials/what-is-dns|What Is DNS and How Does It Work – A Comprehensive Guide]]\\
+I have been using Bind9 as my home LAN DNS for the past few years. I originally operated it on bare metal on my home router computer.  In mid 2023 I successfully moved my Bind9 primary instance to my main home server in a container and created a slave instance in a container running on my home router computer.  I created a Docker Bind9 Image using base Docker Alpine Linux images, with S6 init system.
 The main router must be set to forward packets!
@@ Line 25: / Line 26: @@
     *''named-checkconf -p'' for a flatened uncomment listing of the configuration files
+I have setup a primary DNS server and secondary slave DNS server.
+  *The primary DNS server runs on my main home server, it is the master
+  *The secondary DNS server runs on my router, it is set up as a slave server from the primary server and reads the zone files from the master when available.
+====bind9 docker image====
+I use the [[https://wiki.kptree.net/doku.php?id=docker_notes:init#s6_supervision_rc_system| s6 rc system]].
+Notes
+  -I never had much success with the S6_KEEP_ENV when I played around with this earlier.
+  -Some of the packages are handy for debugging the container, but not required for normal package operation.  Hence these are commented out.
+++++Dockerfile|
+<code>FROM alpine:latest
+ARG S6_OVERLAY_VERSION=3.1.6.2
+ADD https://github.com/just-containers/s6-overlay/releases/download/v${S6_OVERLAY_VERSION}/s6-overlay-noarch.tar.xz /tmp
+RUN tar -C / -Jxpf /tmp/s6-overlay-noarch.tar.xz
+ADD https://github.com/just-containers/s6-overlay/releases/download/v${S6_OVERLAY_VERSION}/s6-overlay-x86_64.tar.xz /tmp
+RUN tar -C / -Jxpf /tmp/s6-overlay-x86_64.tar.xz
+#ENV S6_KEEP_ENV=1
+#this keeps the environment variables
+ENTRYPOINT ["/init"]
+#add UID & GID
+RUN \
+addgroup -g 99 named && \
+adduser -G named -u 99  -G named -D -S -h /dev/null named
+RUN apk update && \
+apk --no-cache add \
+bind \
+bind-dnssec-tools \
+&& \
+apk upgrade
+#util-linux \
+#vim \
+#less \
+COPY user/* /etc/s6-overlay/s6-rc.d/user/contents.d/
+COPY s6-rc.d /etc/s6-overlay/s6-rc.d/
+EXPOSE 53/tcp
+EXPOSE 53/udp
+EXPOSE 953/tcp
+</code>
+++++
+====docker compose====
+A key point is the docker network is in host mode. (The ports are opened directly on the host and not routed from the docker internal network.)
+++++docker-compose.yml|
+<code yaml>---
+services:
+  bind:
+    build: ./
+    image: bind:latest
+    tty: true
+    stdin_open: true
+    container_name: kptr-dns-1
+    restart: 'always' # always | unless-stopped | no | on-failure [:max-retries]
+    volumes:
+      - '/mnt/docker_store/bind9/.config:/app/'
+      - '/mnt/docker_store/bind9/.config/etc/bind:/etc/bind/'
+      - '/mnt/docker_store/bind9/.config/var/bind:/var/bind/'
+      - '/mnt/docker_store/bind9/.config/var/log:/var/log/'
+    network_mode: host
+    command: /bin/sh</code>
+++++
 ====References====
   *[[https://askubuntu.com/questions/311053/how-to-make-ip-forwarding-permanent|How to make IP forwarding permanent?]]
@@ Line 40: / Line 113: @@
    *[[https://serverspace.us/support/help/bind9-as-a-secondary-dns-server-on-ubuntu/|How to Configure BIND9 as a Secondary DNS Server on Ubuntu 20.04]]
    *[[https://askubuntu.com/questions/152593/command-line-to-list-dns-servers-used-by-my-system|Command-line to list DNS servers used by my system]]
+   *[[https://computingforgeeks.com/configure-slave-bind-dns-server-on-ubuntu/|Configure Slave BIND DNS Server on Ubuntu 22.04|20.04]]
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