CTDB must be run under init process

Dockerfile

@@ -56,6 +56,7 @@ RUN apt-get -y update && \
         supervisor \
         cups \
 				ctdb \
+				tini \
 				samba-exporter && \
 	apt-get clean && \
 	rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* && \

entrypoint.sh

@@ -41,7 +41,9 @@ if [ "$1" = "ctdb" ]; then
 	mkdir -p "$CLUSTER_SYSDIR_LOCAL/ctdb-run"
 	rm -rf /run/ctdb
 	ln -s "$CLUSTER_SYSDIR_LOCAL/ctdb-run" /run/ctdb
-	exec /usr/sbin/ctdbd --interactive
+
+	# We cannot run as PID 1 due to orphans (see https://lists.samba.org/archive/samba-technical/2021-July/136753.html)
+	exec tini -- /usr/sbin/ctdbd --interactive
 fi
 
 if [ -z "$NETBIOS_NAME" ]; then