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data/Dockerfiles/unbound/Dockerfile

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+FROM alpine:3.20
+
+LABEL maintainer = "The Infrastructure Company GmbH <info@servercow.de>"
+
+RUN apk add --update --no-cache \
+	curl \
+	bind-tools \
+	coreutils \
+	unbound \
+	bash \
+	openssl \
+	drill \
+	tzdata \
+	syslog-ng \
+	supervisor \
+	&& curl -o /etc/unbound/root.hints https://www.internic.net/domain/named.cache \
+	&& chown root:unbound /etc/unbound \
+    && adduser unbound tty \
+	&& chmod 775 /etc/unbound
+
+EXPOSE 53/udp 53/tcp
+
+COPY docker-entrypoint.sh /docker-entrypoint.sh
+
+# healthcheck (dig, ping)
+COPY healthcheck.sh /healthcheck.sh
+COPY syslog-ng.conf /etc/syslog-ng/syslog-ng.conf
+COPY supervisord.conf /etc/supervisor/supervisord.conf
+COPY stop-supervisor.sh /usr/local/sbin/stop-supervisor.sh
+
+RUN chmod +x /healthcheck.sh
+HEALTHCHECK --interval=30s --timeout=10s \
+  CMD sh -c '[ -f /tmp/healthcheck_status ] && [ "$(cat /tmp/healthcheck_status)" -eq 0 ] || exit 1'
+
+ENTRYPOINT ["/docker-entrypoint.sh"]
+CMD ["/usr/bin/supervisord", "-c", "/etc/supervisor/supervisord.conf"]

data/Dockerfiles/unbound/docker-entrypoint.sh

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+#!/bin/bash
+
+echo "Setting console permissions..."
+chown root:tty /dev/console
+chmod g+rw /dev/console
+echo "Receiving anchor key..."
+/usr/sbin/unbound-anchor -a /etc/unbound/trusted-key.key
+echo "Receiving root hints..."
+curl -#o /etc/unbound/root.hints https://www.internic.net/domain/named.cache
+/usr/sbin/unbound-control-setup
+
+# Run hooks
+for file in /hooks/*; do
+  if [ -x "${file}" ]; then
+    echo "Running hook ${file}"
+    "${file}"
+  fi
+done
+
+exec "$@"

data/Dockerfiles/unbound/healthcheck.sh

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+#!/bin/bash
+
+STATUS_FILE="/tmp/healthcheck_status"
+RUNS=0
+
+# Declare log function for logfile to stdout
+function log_to_stdout() {
+echo "$(date +"%Y-%m-%d %H:%M:%S"): $1"
+}
+
+# General Ping function to check general pingability
+function check_ping() {
+declare -a ipstoping=("1.1.1.1" "8.8.8.8" "9.9.9.9")
+local fail_tolerance=1
+local failures=0
+
+for ip in "${ipstoping[@]}" ; do
+    success=false
+    for ((i=1; i<=3; i++)); do
+        ping -q -c 3 -w 5 "$ip" > /dev/null
+        if [ $? -eq 0 ]; then
+            success=true
+            break
+        else
+            log_to_stdout "Healthcheck: Failed to ping $ip on attempt $i. Trying again..."
+        fi
+    done
+    
+    if [ "$success" = false ]; then
+        log_to_stdout "Healthcheck: Couldn't ping $ip after 3 attempts. Marking this IP as failed."
+        ((failures++))
+    fi
+done
+
+if [ $failures -gt $fail_tolerance ]; then
+    log_to_stdout "Healthcheck: Too many ping failures ($fail_tolerance failures allowed, you got $failures failures), marking Healthcheck as unhealthy..."
+    return 1
+fi
+
+return 0
+
+}
+
+# General DNS Resolve Check against Unbound Resolver himself
+function check_dns() {
+declare -a domains=("fuzzy.mailcow.email" "github.com" "hub.docker.com")
+local fail_tolerance=1
+local failures=0
+
+for domain in "${domains[@]}" ; do
+    success=false
+    for ((i=1; i<=3; i++)); do
+        dig_output=$(dig +short +timeout=2 +tries=1 "$domain" @127.0.0.1 2>/dev/null)
+        dig_rc=$?
+
+        if [ $dig_rc -ne 0 ] || [ -z "$dig_output" ]; then
+            log_to_stdout "Healthcheck: DNS Resolution Failed on attempt $i for $domain! Trying again..."
+        else
+            success=true
+            break
+        fi
+    done
+    
+    if [ "$success" = false ]; then
+        log_to_stdout "Healthcheck: DNS Resolution not possible after 3 attempts for $domain... Gave up!"
+        ((failures++))
+    fi
+done
+
+if [ $failures -gt $fail_tolerance ]; then
+    log_to_stdout "Healthcheck: Too many DNS failures ($fail_tolerance failures allowed, you got $failures failures), marking Healthcheck as unhealthy..."
+    return 1
+fi
+
+return 0
+}
+
+while true; do
+
+    if [[ ${SKIP_UNBOUND_HEALTHCHECK} == "y" ]]; then
+    log_to_stdout "Healthcheck: ALL CHECKS WERE SKIPPED! Unbound is healthy!"
+    echo "0" > $STATUS_FILE
+    sleep 365d
+    fi
+
+    # run checks, if check is not returning 0 (return value if check is ok), healthcheck will exit with 1 (marked in docker as unhealthy)
+    check_ping
+    PING_STATUS=$?
+
+    check_dns
+    DNS_STATUS=$?
+
+    if [ $PING_STATUS -ne 0 ] || [ $DNS_STATUS -ne 0 ]; then
+        echo "1" > $STATUS_FILE
+
+    else
+        echo "0" > $STATUS_FILE
+    fi
+
+    sleep 30
+
+done

data/Dockerfiles/unbound/stop-supervisor.sh

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+#!/bin/bash
+
+printf "READY\n";
+
+while read line; do
+  echo "Processing Event: $line" >&2;
+  kill -3 $(cat "/var/run/supervisord.pid")
+done < /dev/stdin
+
+rm -rf /tmp/healthcheck_status

data/Dockerfiles/unbound/supervisord.conf

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+[supervisord]
+nodaemon=true
+user=root
+pidfile=/var/run/supervisord.pid
+
+[program:syslog-ng]
+command=/usr/sbin/syslog-ng --foreground --no-caps
+stdout_logfile=/dev/stdout
+stdout_logfile_maxbytes=0
+stderr_logfile=/dev/stderr
+stderr_logfile_maxbytes=0
+autostart=true
+
+[program:unbound]
+command=/usr/sbin/unbound
+stdout_logfile=/dev/stdout
+stdout_logfile_maxbytes=0
+stderr_logfile=/dev/stderr
+stderr_logfile_maxbytes=0
+autorestart=true
+
+[program:unbound-healthcheck]
+command=/bin/bash /healthcheck.sh
+stdout_logfile=/dev/stdout
+stdout_logfile_maxbytes=0
+stderr_logfile=/dev/stderr
+stderr_logfile_maxbytes=0
+autorestart=true
+
+[eventlistener:processes]
+command=/usr/local/sbin/stop-supervisor.sh
+events=PROCESS_STATE_STOPPED, PROCESS_STATE_EXITED, PROCESS_STATE_FATAL

data/Dockerfiles/unbound/syslog-ng.conf

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+@version: 4.5
+@include "scl.conf"
+options {
+  chain_hostnames(off);
+  flush_lines(0);
+  use_dns(no);
+  use_fqdn(no);
+  owner("root"); group("adm"); perm(0640);
+  stats(freq(0));
+  keep_timestamp(no);
+  bad_hostname("^gconfd$");
+};
+source s_dgram {
+  unix-dgram("/dev/log");
+  internal();
+};
+destination d_stdout { pipe("/dev/stdout"); };
+log {
+  source(s_dgram);
+  destination(d_stdout);
+};