Issues-470: run flush cache on start/restart vanilla-forums

Author: atelomycterus

Dockerfile

@@ -81,4 +81,10 @@ RUN if [ "$ENV" = "dev" ]; then \
     apt-get clean && \
     rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*; \
     echo 'extension=tideways.so\ntideways.connection=tcp://tideways-daemon:9135\ntideways.enable_cli=0\n' >> opt/docker/etc/php/php.ini; \
-fi
+fi
+
+# Copy custom supervisor's configs and scripts
+# Netcat is used to connect to a memcached server
+RUN apt-get update && apt-get install -y netcat
+COPY ./services/flush_cache.conf /opt/docker/etc/supervisor.d/
+COPY ./services/flush_cache.sh /opt/docker/bin/service.d/

services/flush_cache.conf

@@ -0,0 +1,15 @@
+[group:flush_cache]
+programs=flush_cache
+priority=1
+
+[program:flush_cache]
+command=/opt/docker/bin/service.d/flush_cache.sh
+process_name=%(program_name)s
+startsecs=0
+startretries=0
+autostart=true
+autorestart=false
+stdout_logfile=/dev/stdout
+stdout_logfile_maxbytes=0
+stderr_logfile=/dev/stderr
+stderr_logfile_maxbytes=0

services/flush_cache.sh

@@ -0,0 +1,11 @@
+#!/bin/sh
+MEMCACHED_SERVER_HOST=$(echo $MEMCACHED_SERVER| cut -d':' -f 1)
+MEMCACHED_SERVER_PORT=$(echo $MEMCACHED_SERVER| cut -d':' -f 2)
+echo flush_cache.sh: connecting to $MEMCACHED_SERVER
+echo flush_all | nc -q5 $MEMCACHED_SERVER_HOST $MEMCACHED_SERVER_PORT
+nc_exit_code=$?
+if [  $nc_exit_code != 0 ]; then
+  echo flush_cache.sh: exit code $nc_exit_code
+else
+  echo flush_cache.sh: connection was made and completed successfully
+fi