9.18.31

2025-10-23 00:02:09 +00:00 · 2024-12-03 14:35:57 +01:00
parent 35b83c26d5
commit 25985de890
21 changed files with 373 additions and 109 deletions
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -14,13 +14,19 @@ jobs:
  release:
    name: release
    runs-on: ubuntu-latest
+    defaults:
+      run:
+        shell: bash
+        working-directory: ./
    steps:
      - name: create release notes
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          tag: ${{ github.ref_name }}
        run: |
+          set -ex; \
+          wget -O ./RELEASE.md https://raw.githubusercontent.com/${GITHUB_REPOSITORY}/refs/heads/master/RELEASE.md; \
          gh release create "$tag" \
              --repo="$GITHUB_REPOSITORY" \
              --title="${tag#v}" \
-              --generate-notes
+              -F ./RELEASE.md
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 maintain/
-project*
+project*
+build
--- a/README.md
+++ b/README.md
@@ -1,12 +1,27 @@
 ![Banner](https://github.com/11notes/defaults/blob/main/static/img/banner.png?raw=true)

 # 🏔️ Alpine - BIND
-![size](https://img.shields.io/docker/image-size/11notes/bind/9.18.30?color=0eb305) ![version](https://img.shields.io/docker/v/11notes/bind/9.18.30?color=eb7a09) ![pulls](https://img.shields.io/docker/pulls/11notes/bind?color=2b75d6)
+[<img src="https://img.shields.io/badge/github-source-blue?logo=github">](https://github.com/11notes/docker-bind/tree/9.18.31) ![size](https://img.shields.io/docker/image-size/11notes/bind/9.18.31?color=0eb305) ![version](https://img.shields.io/docker/v/11notes/bind/9.18.31?color=eb7a09) ![pulls](https://img.shields.io/docker/pulls/11notes/bind?color=2b75d6)

-**BIND DNS server**
+**High performance bind with default operating modes**

 # SYNOPSIS
-What can I do with this? This image will run BIND9 DNS server precompiled for large installations and maximum performance.
+**What can I do with this?** This image will run BIND9 DNS server precompiled for large installations and maximum performance. It also offers three operating modes: Master, Slave and Resolver set via **command: ["mode"]**.
+
+# Master
+If run as master, set the IPs of the slaves via *BIND_SLAVES*. Bind will operate with catalog zones for all slaves. You can add new zones via the *addzone* script that requires the zone name and the IP of at least one NS (slave). You can then use nsupdate to update the master with new records and all changes are populates to all slaves automatically. Add a new zone like this:
+
+```shell
+docker exec master addzone contoso.com 10.255.53.52
+```
+
+It will automatically create a default zone and populate it as well as add a random key for managing the zone via nsupdate or via the dynamically created root key at startup (check /bind/etc/keys.conf for generated keys). Checkout **compose.authoritative.yaml** for an example.
+
+# Slave
+If run as slave, make sure you set the *BIND_MASTERS* IPs so they will pickup all changes automatically. The slave enables recursion, so make sure you have a resolver present to resolve queries not handles by the slave. The slave will respond to all IPs on RFC1918 by default. You can setup your own config as well. You can run as many slaves as you like.
+
+# Resolver
+If run as a resolver, it will cache all results and use the root zone NS to create its own cache database for all records requested. Make sure the resolver has internet access. The resolver will accept all connections from any RFC1918 address. Checkout **compose.resolver.yaml** for an example.

 # VOLUMES
 * **/bind/etc** - Directory of named.conf
@@ -16,7 +31,7 @@ What can I do with this? This image will run BIND9 DNS server precompiled for la
 ```yaml
 services:
  bind:
-    image: "11notes/bind:9.18.30"
+    image: "11notes/bind:9.18.31"
    container_name: "bind"
    environment:
      TZ: "Europe/Zurich"
@@ -35,28 +50,6 @@ volumes:
  var:
 ```

-# EXAMPLES
-## config /bind/etc/named.conf
-```
-options {
-  listen-on { any; };
-  directory "/bind/etc";
-  recursion no;
-  allow-notify { none; };
-  forwarders { 9.9.9.9; 9.9.9.10; };
-  version "0.0";
-  auth-nxdomain no;
-  max-cache-size 0;
-  dnssec-validation auto;
-};
-
-statistics-channels {
-  inet 0.0.0.0 port 8053;
-};
-
-server ::/0 { bogus yes; };
-```
-
 # DEFAULT SETTINGS
 | Parameter | Value | Description |
 | --- | --- | --- |
@@ -70,9 +63,11 @@ server ::/0 { bogus yes; };
 | --- | --- | --- |
 | `TZ` | [Time Zone](https://en.wikipedia.org/wiki/List_of_tz_database_time_zones) | |
 | `DEBUG` | Show debug information | |
+| `BIND_SLAVES` | IPs of bind slaves if using authoritative master (add ;) | |
+| `BIND_MASTERS` | IPs of bind master if using authoritative slave (add ;) | |

 # SOURCE
-* [11notes/bind](https://github.com/11notes/docker-bind)
+* [11notes/bind:9.18.31](https://github.com/11notes/docker-bind/tree/9.18.31)

 # PARENT IMAGE
 * [11notes/alpine:stable](https://hub.docker.com/r/11notes/alpine)
@@ -86,5 +81,4 @@ server ::/0 { bogus yes; };
 * Use Let’s Encrypt certificates to protect your SSL endpoints

 # ElevenNotes<sup>™️</sup>
-This image is provided to you at your own risk. Always make backups before updating an image to a new version. Check the changelog for breaking changes. You can find all my repositories on [github](https://github.com/11notes).
-    
+This image is provided to you at your own risk. Always make backups before updating an image to a different version. Check the [RELEASE.md](https://github.com/11notes/docker-bind/blob/9.18.31/RELEASE.md) for breaking changes. You can find all my repositories on [github](https://github.com/11notes).
--- a/RELEASE.md
+++ b/RELEASE.md
@@ -0,0 +1,2 @@
+### New Features
+* Operating modus: Master, Slave and Resolver
--- a/amd64.dockerfile
+++ b/amd64.dockerfile
@@ -8,7 +8,7 @@

 # :: Build
  FROM 11notes/alpine:stable as build
-  ARG BUILD_VERSION=9.18.30
+  ARG BUILD_VERSION=9.18.31
  ARG BUILD_DIR=/bind9

  USER root
@@ -79,14 +79,14 @@

  RUN set -ex; \
    cd ${BUILD_DIR}; \
-    make install-strip;
+    make install;

 # :: Header
  FROM 11notes/alpine:stable
-  COPY --from=util /util/linux/shell/elevenLogJSON /usr/local/bin
+  COPY --from=util /util/docker /usr/local/bin
  COPY --from=build /opt/bind /opt/bind
  ENV APP_NAME="bind"
-  ENV APP_VERSION=9.18.30
+  ENV APP_VERSION=9.18.31
  ENV APP_ROOT=/bind

 # :: Run
@@ -111,10 +111,6 @@
        jemalloc \
        krb5;

-  # :: upgrade
-    RUN set -ex; \
-      apk --no-cache --update upgrade;
-
  # :: copy root filesystem
    COPY ./rootfs /
    RUN set -ex; \
@@ -131,7 +127,7 @@
  VOLUME ["${APP_ROOT}/etc", "${APP_ROOT}/var"]

 # :: Monitor
-  HEALTHCHECK CMD /usr/local/bin/healthcheck.sh || exit 1
+  HEALTHCHECK --interval=5s --timeout=3s CMD /usr/local/bin/healthcheck.sh || exit 1

 # :: Start
  USER docker
--- a/arm64v8.dockerfile
+++ b/arm64v8.dockerfile
@@ -12,7 +12,7 @@
 # :: Build
  FROM --platform=linux/arm64 11notes/alpine:stable as build
  COPY --from=qemu /usr/bin/qemu-aarch64-static /usr/bin
-  ARG BUILD_VERSION=9.18.30
+  ARG BUILD_VERSION=9.18.31
  ARG BUILD_DIR=/bind9

  USER root
@@ -83,15 +83,15 @@

  RUN set -ex; \
    cd ${BUILD_DIR}; \
-    make install-strip;
+    make install;

 # :: Header
  FROM --platform=linux/arm64 11notes/alpine:stable
  COPY --from=qemu /usr/bin/qemu-aarch64-static /usr/bin
-  COPY --from=util /util/linux/shell/elevenLogJSON /usr/local/bin
+  COPY --from=util /util/docker /usr/local/bin
  COPY --from=build /opt/bind /opt/bind
  ENV APP_NAME="bind"
-  ENV APP_VERSION=9.18.30
+  ENV APP_VERSION=9.18.31
  ENV APP_ROOT=/bind

 # :: Run
@@ -116,10 +116,6 @@
        jemalloc \
        krb5;

-  # :: upgrade
-    RUN set -ex; \
-      apk --no-cache --update upgrade;
-
  # :: copy root filesystem
    COPY ./rootfs /
    RUN set -ex; \
@@ -136,7 +132,7 @@
  VOLUME ["${APP_ROOT}/etc", "${APP_ROOT}/var"]

 # :: Monitor
-  HEALTHCHECK CMD /usr/local/bin/healthcheck.sh || exit 1
+  HEALTHCHECK --interval=5s --timeout=3s CMD /usr/local/bin/healthcheck.sh || exit 1

 # :: Start
  USER docker
--- a/compose.authoritative.yaml
+++ b/compose.authoritative.yaml
@@ -0,0 +1,55 @@
+name: "authoritative"
+services:
+  master:
+    image: "11notes/bind:9.18.31"
+    container_name: "master"
+    command: ["master"]
+    environment:
+      TZ: "Europe/Zurich"
+      BIND_SLAVES: "10.255.53.2;10.255.53.3;"
+    networks:
+       macvlan:
+        ipv4_address: 10.255.53.1
+    sysctls:
+      - "net.ipv4.ip_unprivileged_port_start=53"
+    restart: always
+
+  slave1:
+    image: "11notes/bind:9.18.31"
+    container_name: "slave1"
+    command: ["slave"]
+    environment:
+      TZ: "Europe/Zurich"
+      BIND_MASTERS: "10.255.53.1;"
+    networks:
+       macvlan:
+        ipv4_address: 10.255.53.2
+    sysctls:
+      - "net.ipv4.ip_unprivileged_port_start=53"
+    restart: always
+
+  slave2:
+    image: "11notes/bind:9.18.31"
+    container_name: "slave2"
+    command: ["slave"]
+    environment:
+      TZ: "Europe/Zurich"
+      BIND_MASTERS: "10.255.53.1;"
+    networks:
+       macvlan:
+        ipv4_address: 10.255.53.3
+    sysctls:
+      - "net.ipv4.ip_unprivileged_port_start=53"
+    restart: always
+volumes:
+  etc:
+  var:
+networks:
+  macvlan:
+    driver: macvlan
+    driver_opts:
+      parent: eth0
+    ipam:
+      config:
+        - subnet: "10.255.53.0/24"
+          gateway: "10.255.53.254"
--- a/compose.resolver.yaml
+++ b/compose.resolver.yaml
@@ -0,0 +1,15 @@
+name: "resolver"
+services:
+  resolver:
+    image: "11notes/bind:9.18.31"
+    container_name: "resolver"
+    command: ["resolver"]
+    environment:
+      TZ: "Europe/Zurich"
+    ports:
+      - "53:53/udp"
+      - "53:53/tcp"
+      - "8053:8053/tcp"
+    sysctls:
+      - "net.ipv4.ip_unprivileged_port_start=53"
+    restart: always
--- a/compose.yaml
+++ b/compose.yaml
@@ -1,6 +1,6 @@
 services:
  bind:
-    image: "11notes/bind:9.18.30"
+    image: "11notes/bind:9.18.31"
    container_name: "bind"
    environment:
      TZ: "Europe/Zurich"
--- a/hooks/post_push
+++ b/hooks/post_push
@@ -1,4 +0,0 @@
-#!/bin/bash
-  curl -Lo manifest-tool https://github.com/estesp/manifest-tool/releases/download/v0.9.0/manifest-tool-linux-amd64
-  chmod +x manifest-tool
-  ./manifest-tool push from-spec multi-arch-manifest-version.yaml
--- a/multi-arch-manifest-version.yaml
+++ b/multi-arch-manifest-version.yaml
@@ -1,10 +1,10 @@
-image: 11notes/bind:9.18.30
+image: 11notes/bind:9.18.31
 manifests:
-  - image: 11notes/bind:9.18.30
+  - image: 11notes/bind:9.18.31
    platform:
      architecture: amd64
      os: linux
-  - image: 11notes/bind:9.18.30
+  - image: 11notes/bind:9.18.31
    platform:
      architecture: arm64
      os: linux
--- a/rootfs/bind/.default/authoritative-master.conf
+++ b/rootfs/bind/.default/authoritative-master.conf
@@ -0,0 +1,49 @@
+options {
+  listen-on { any; };
+  directory "/bind/etc";
+  recursion no;
+  version "0.0";
+  auth-nxdomain no;
+  max-cache-size 0;
+  dnssec-validation no;
+  notify explicit;
+  allow-transfer { %SLAVES% };
+  also-notify { %SLAVES% };
+  allow-new-zones yes;
+};
+
+server ::/0 { bogus yes; };
+
+key "rndc" {
+  algorithm hmac-sha256;
+  secret "%KEY%";
+};
+
+key "catalog.home.arpa" {
+  algorithm hmac-sha256;
+  secret "%KEY_CATALOG%";
+};
+
+controls {
+  inet 127.0.0.1 port 953
+  allow { 127.0.0.1; } keys { "rndc"; };
+};
+
+statistics-channels {
+  inet 0.0.0.0 port 8053;
+};
+
+acl acl-rfc1918 {
+  127.0.0.1;
+  10.0.0.0/8;
+  172.16.0.0/12;
+  192.168.0.0/16;
+};
+
+view "authoritative" {
+  include "/bind/etc/keys.conf";
+  
+  match-clients { acl-rfc1918; };
+  allow-query { acl-rfc1918; };
+  zone "catalog.home.arpa" { type master; file "/bind/var/catalog.home.arpa.db"; allow-update { key catalog.home.arpa.; 127.0.0.1; }; };
+};
--- a/rootfs/bind/.default/authoritative-slave.conf
+++ b/rootfs/bind/.default/authoritative-slave.conf
@@ -0,0 +1,42 @@
+options {
+  listen-on { any; };
+  directory "/bind/etc";
+  recursion no;
+  version "0.0";
+  auth-nxdomain no;
+  max-cache-size 0;
+  dnssec-validation no;
+  notify explicit;
+  allow-new-zones yes;
+  catalog-zones { zone "catalog.home.arpa" default-masters { %MASTERS% }; };
+};
+
+server ::/0 { bogus yes; };
+
+key "rndc" {
+  algorithm hmac-sha256;
+  secret "%KEY%";
+};
+
+controls {
+  inet 127.0.0.1 port 953
+  allow { 127.0.0.1; } keys { "rndc"; };
+};
+
+acl acl-rfc1918 {
+  127.0.0.1;
+  10.0.0.0/8;
+  172.16.0.0/12;
+  192.168.0.0/16;
+};
+
+view "authoritative" {
+  recursion yes;
+
+  match-clients { acl-rfc1918; };
+  allow-query { acl-rfc1918; };
+  allow-recursion { acl-rfc1918; };
+  allow-query-cache { acl-rfc1918; };
+
+  zone "catalog.home.arpa" { type slave; file "/bind/var/catalog.home.arpa.db"; masters { %MASTERS% }; };
+};
--- a/rootfs/bind/.default/resolver.conf
+++ b/rootfs/bind/.default/resolver.conf
@@ -0,0 +1,38 @@
+options {
+  listen-on { any; };
+  directory "/bind/etc";
+  recursion no;
+  version "0.0";
+  auth-nxdomain no;
+  max-cache-size 0;
+  dnssec-validation auto;
+  notify no;
+  allow-transfer { none; };
+  also-notify { none; };
+  prefetch 2 9;
+  recursive-clients 4096;
+};
+
+statistics-channels {
+  inet 0.0.0.0 port 8053;
+};
+
+server ::/0 { bogus yes; };
+
+acl acl-rfc1918 {
+  127.0.0.1;
+  10.0.0.0/8;
+  172.16.0.0/12;
+  192.168.0.0/16;
+};
+
+view "resolver" {
+  recursion yes;
+
+  match-clients { acl-rfc1918; };
+  allow-query { acl-rfc1918; };
+  allow-recursion { acl-rfc1918; };
+  allow-query-cache { acl-rfc1918; };
+
+  zone "." { type hint; file "/bind/var/root.db"; };
+};
--- a/rootfs/bind/.default/rndc.conf
+++ b/rootfs/bind/.default/rndc.conf
@@ -0,0 +1,10 @@
+key "rndc" {
+  algorithm hmac-sha256;
+  secret "%KEY%";
+};
+
+options {
+  default-key "rndc";
+  default-server 127.0.0.1;
+  default-port 953;
+};
--- a/rootfs/bind/etc/named.conf
+++ b/rootfs/bind/etc/named.conf
@@ -1,17 +0,0 @@
-options {
-  listen-on { any; };
-  directory "/bind/etc";
-  recursion no;
-  allow-notify { none; };
-  forwarders { 9.9.9.9; 9.9.9.10; };
-  version "0.0";
-  auth-nxdomain no;
-  max-cache-size 0;
-  dnssec-validation auto;
-};
-
-statistics-channels {
-  inet 0.0.0.0 port 8053;
-};
-
-server ::/0 { bogus yes; };
--- a/rootfs/bind/var/root.db
+++ b/rootfs/bind/var/root.db
@@ -1,26 +0,0 @@
-.                       518400  IN      NS      a.root-servers.net.
-.                       518400  IN      NS      b.root-servers.net.
-.                       518400  IN      NS      c.root-servers.net.
-.                       518400  IN      NS      d.root-servers.net.
-.                       518400  IN      NS      e.root-servers.net.
-.                       518400  IN      NS      f.root-servers.net.
-.                       518400  IN      NS      g.root-servers.net.
-.                       518400  IN      NS      h.root-servers.net.
-.                       518400  IN      NS      i.root-servers.net.
-.                       518400  IN      NS      j.root-servers.net.
-.                       518400  IN      NS      k.root-servers.net.
-.                       518400  IN      NS      l.root-servers.net.
-.                       518400  IN      NS      m.root-servers.net.
-a.root-servers.net.     518400  IN      A       198.41.0.4
-b.root-servers.net.     518400  IN      A       170.247.170.2
-c.root-servers.net.     518400  IN      A       192.33.4.12
-d.root-servers.net.     518400  IN      A       199.7.91.13
-e.root-servers.net.     518400  IN      A       192.203.230.10
-f.root-servers.net.     518400  IN      A       192.5.5.241
-g.root-servers.net.     518400  IN      A       192.112.36.4
-h.root-servers.net.     518400  IN      A       198.97.190.53
-i.root-servers.net.     518400  IN      A       192.36.148.17
-j.root-servers.net.     518400  IN      A       192.58.128.30
-k.root-servers.net.     518400  IN      A       193.0.14.129
-l.root-servers.net.     518400  IN      A       199.7.83.42
-m.root-servers.net.     518400  IN      A       202.12.27.33
--- a/rootfs/usr/local/bin/addzone
+++ b/rootfs/usr/local/bin/addzone
@@ -0,0 +1,32 @@
+#!/bin/ash
+
+  # create dummy zone
+  DB=${APP_ROOT}/var/${1}.db
+  cat <<EOT > ${APP_ROOT}/var/${1}.db
+${1}. IN SOA . . 1 28800 7200 604800 86400
+${1}. IN NS ns1.${1}.
+ns1.${1}. IN A ${2}
+EOT
+
+  # change workdir
+  cd ${APP_ROOT}/etc
+
+  # create TSIG for new zone
+  KEY=$(head -200 /dev/urandom | cksum | cut -f1 -d " " | sha256sum | tr -d "[:space:]-")
+  echo "key \"${1}\" { algorithm hmac-sha256; secret \"${KEY}\"; };" >> /bind/etc/keys.conf
+
+  # add new zone to master
+  /opt/bind/sbin/rndc addzone ${1} IN authoritative '{type primary; file "'${DB}'"; allow-update { key '${1}'.; key root.; 127.0.0.1; }; };'
+
+  # update catalog with new zone
+  UID=$(echo "${1}" | sha1sum | tr -d "[:space:]-")
+  cat <<EOT | /opt/bind/bin/nsupdate
+server 127.0.0.1 53
+update add ${UID}.zones.catalog.home.arpa 3600 IN PTR ${1}
+send
+EOT
+
+  elevenLogJSON info "added new zone ${1} to catalog as ${UID}.zones.catalog.home.arpa"
+
+  # reload config due to new keys
+  /opt/bind/sbin/rndc reload &> /dev/null
--- a/rootfs/usr/local/bin/entrypoint.sh
+++ b/rootfs/usr/local/bin/entrypoint.sh
@@ -1,15 +1,90 @@
 #!/bin/ash
-  if [ -z "${1}" ]; then
-    if [ ! -f "/bind/var/root.db" ]; then
-      elevenLogJSON info "creating root db"
-      rootdb
-    fi
+  NAMED_CONF=${APP_ROOT}/etc/named.conf
+  RNDC_CONF=${APP_ROOT}/etc/rndc.conf

-    elevenLogJSON info "starting ${APP_NAME} (${APP_VERSION})"
+  if [ -z "${1}" ]; then
+    echo "custom" > ${APP_ROOT}/etc/mode
+    elevenLogJSON info "starting ${APP_NAME} v${APP_VERSION}"
    set -- "/opt/bind/sbin/named" \
      -fg \
-      -c "/bind/etc/named.conf"  \
+      -c "${NAMED_CONF}"  \
      -u docker
+  else
+    if echo "$@" | grep -q "resolver"; then
+      # run bind as a resolver
+      echo "slave" > ${APP_ROOT}/etc/mode
+      if [ ! -f "${APP_ROOT}/var/root.db" ]; then
+        elevenLogJSON info "creating root db for resolver"
+        rootdb
+      fi
+
+      if [ ! -f "${NAMED_CONF}" ]; then
+        elevenLogJSON info "creating resolver configuration"
+        cp ${APP_ROOT}/.default/resolver.conf ${NAMED_CONF}
+      fi
+
+      elevenLogJSON info "starting ${APP_NAME} v${APP_VERSION} as resolver"
+      set -- "/opt/bind/sbin/named" \
+        -fg \
+        -c "${NAMED_CONF}"  \
+        -u docker
+    fi
+
+    if echo "$@" | grep -q "master"; then
+      # run bind as an authoritative master
+      echo "master" > ${APP_ROOT}/etc/mode
+      if [ ! -f "${NAMED_CONF}" ]; then
+        elevenLogJSON info "creating authoritative master configuration"
+        cp ${APP_ROOT}/.default/authoritative-master.conf ${NAMED_CONF}
+        cp ${APP_ROOT}/.default/rndc.conf ${RNDC_CONF}
+
+        KEY=$(head -200 /dev/urandom | cksum | cut -f1 -d " " | sha256sum | tr -d "[:space:]-")
+        KEY_CATALOG=$(head -200 /dev/urandom | cksum | cut -f1 -d " " | sha256sum | tr -d "[:space:]-")
+
+        sed -i 's/%SLAVES%/'${BIND_SLAVES}'/' ${NAMED_CONF}
+        sed -i 's/%KEY%/'${KEY}'/' ${NAMED_CONF}
+        sed -i 's/%KEY%/'${KEY}'/' ${RNDC_CONF}
+        sed -i 's/%KEY_CATALOG%/'${KEY_CATALOG}'/' ${NAMED_CONF}
+      fi
+
+      if [ ! -f "${APP_ROOT}/var/catalog.home.arpa.db" ]; then
+        echo "\$TTL 1h" > ${APP_ROOT}/var/catalog.home.arpa.db
+        echo "catalog.home.arpa. IN SOA . . 1 28800 7200 604800 86400" >> ${APP_ROOT}/var/catalog.home.arpa.db
+        echo "catalog.home.arpa. IN NS invalid." >> ${APP_ROOT}/var/catalog.home.arpa.db
+        echo "version IN TXT \"1\"" >> ${APP_ROOT}/var/catalog.home.arpa.db
+      fi
+
+      if [ ! -f "${APP_ROOT}/etc/keys.conf" ]; then
+        KEY=$(head -200 /dev/urandom | cksum | cut -f1 -d " " | sha256sum | tr -d "[:space:]-")
+        echo "key \"root\" { algorithm hmac-sha256; secret \"${KEY}\"; };" > ${APP_ROOT}/etc/keys.conf
+      fi
+
+      elevenLogJSON info "starting ${APP_NAME} v${APP_VERSION} as authoritative master"
+      set -- "/opt/bind/sbin/named" \
+        -fg \
+        -c "${NAMED_CONF}"  \
+        -u docker
+    fi
+
+    if echo "$@" | grep -q "slave"; then
+      # run bind as an authoritative slave
+      echo "slave" > ${APP_ROOT}/etc/mode
+      if [ ! -f "${NAMED_CONF}" ]; then
+        elevenLogJSON info "creating authoritative slave configuration"
+        cp ${APP_ROOT}/.default/authoritative-slave.conf ${NAMED_CONF}
+
+        KEY=$(head -200 /dev/urandom | cksum | cut -f1 -d " " | sha256sum | tr -d "[:space:]-")
+
+        sed -i 's/%MASTERS%/'${BIND_MASTERS}'/' ${NAMED_CONF}
+        sed -i 's/%KEY%/'${KEY}'/' ${NAMED_CONF}
+      fi
+
+      elevenLogJSON info "starting ${APP_NAME} v${APP_VERSION} as authoritative slave"
+      set -- "/opt/bind/sbin/named" \
+        -fg \
+        -c "${NAMED_CONF}"  \
+        -u docker
+    fi
  fi

  exec "$@"
--- a/rootfs/usr/local/bin/healthcheck.sh
+++ b/rootfs/usr/local/bin/healthcheck.sh
@@ -1,2 +1,2 @@
 #!/bin/ash
-	dig . NS @localhost || exit 1
+  /opt/bind/bin/dig +time=2 +tries=1 . NS @localhost || exit 1
--- a/rootfs/usr/local/bin/rootdb
+++ b/rootfs/usr/local/bin/rootdb
@@ -6,4 +6,4 @@
    ROOT_DB_NS=a.root-servers.net
  fi

-  dig +bufsize=1200 +norec NS . @${ROOT_DB_NS} | egrep -v ';|^$' | egrep -v '\S.+AAAA.+|^$' | sort > /bind/var/root.db
+  /opt/bind/bin/dig +bufsize=1200 +norec NS . @${ROOT_DB_NS} | egrep -v ';|^$' | egrep -v '\S.+AAAA.+|^$' | sort > /bind/var/root.db