Added file-based HEALTHCHECK

Author: g-nardiello

Dockerfile

@@ -41,4 +41,7 @@ RUN mkdir /backup && \
 
 VOLUME ["/backup"]
 
-CMD dockerize -wait tcp://${MYSQL_HOST}:${MYSQL_PORT} -timeout ${TIMEOUT} /run.sh
+HEALTHCHECK --interval=2s --retries=1800 \
+	CMD stat /HEALTLY.status || exit 1
+
+ENTRYPOINT dockerize -wait tcp://${MYSQL_HOST}:${MYSQL_PORT} -timeout ${TIMEOUT} /run.sh

run.sh

@@ -14,6 +14,8 @@ elif [ -n "${INIT_RESTORE_LATEST}" ]; then
   find /backup -maxdepth 1 -name '*.sql.gz' | tail -1 | xargs /restore.sh
 fi
 
+touch /HEALTLY.status
+
 echo "${CRON_TIME} /backup.sh >> /mysql_backup.log 2>&1" > /tmp/crontab.conf
 crontab /tmp/crontab.conf
 echo "=> Running cron task manager in foreground"