wait for mysql to come up

Dockerfile

@@ -1,7 +1,7 @@
 FROM alpine:latest
 
 RUN apk update && \
-    apk add --no-cache murmur qt-mysql wget bash
+    apk add --no-cache murmur qt-mysql netcat-openbsd wget bash
 RUN wget --no-check-certificate -O /usr/bin/dumb-init https://github.com/Yelp/dumb-init/releases/download/v1.0.1/dumb-init_1.0.1_amd64
 
 COPY murmur.conf /etc/murmur.conf

init.sh

@@ -13,6 +13,14 @@ function write_config_if_else {
  	fi
 }
 
+function wait_for_mysql {
+	if [ ! -z "$DATABASE" ] && [ "$DATABASE" == "MYSQL" ]; then
+		PORT=3306
+		if [ ! -z "$DB_PORT" ] ; then PORT="$DB_PORT" ;fi
+		while ! nc -z $DB_HOST $PORT; do sleep 3; done
+	fi
+}
+
 if [ ! -e /data/murmur.conf ]; then
 	echo Starting Initialization
 	cp /etc/murmur.conf /data/murmur.conf
@@ -37,9 +45,11 @@ if [ ! -e /data/murmur.conf ]; then
 	else
 		write_config 'database' '/data/db.sqlite'
 	fi
-
-	if [ ! -z "$SUPW" ] ; then /usr/bin/murmurd -fg -ini /data/murmur.conf -supw $SUPW ;fi
 	echo Initilization Completed
-fi
 
+	wait_for_mysql
+	if [ ! -z "$SUPW" ] ; then /usr/bin/murmurd -fg -ini /data/murmur.conf -supw $SUPW ;fi
+ 
+fi
+wait_for_mysql
 /usr/bin/murmurd -fg -ini /data/murmur.conf