simpler healthcheck for postfix

core/postfix/Dockerfile

@@ -7,11 +7,10 @@ RUN apk add --no-cache postfix postfix-pcre rsyslog \
 
 COPY conf /conf
 COPY start.py /start.py
-COPY health.sh /health.sh
 
 EXPOSE 25/tcp 10025/tcp
 VOLUME ["/data"]
 
 CMD /start.py
 
-HEALTHCHECK CMD /health.sh
+HEALTHCHECK CMD echo QUIT|nc localhost 25|grep "220 .* ESMTP Postfix"

core/postfix/health.sh

@@ -1,8 +0,0 @@
-#!/bin/sh
-
-if [ "$(echo QUIT|nc localhost 25|tail -n1|cut -f1 -d ' ')" = "221" ]; then
-	echo "ping successful"
-else
-	echo "ping failed"
-	exit 1
-fi