Run Apache2 in background

Dockerfile.slim.apache

@@ -194,10 +194,7 @@ RUN a2enconf docker-php
 ENV PHP_EXTRA_BUILD_DEPS apache2-dev
 ENV PHP_EXTRA_CONFIGURE_ARGS --with-apxs2 --disable-cgi
 
-# https://httpd.apache.org/docs/2.4/stopping.html#gracefulstop
-STOPSIGNAL SIGWINCH
-
-COPY utils/apache2-foreground /usr/local/bin/
+COPY utils/apache2-background /usr/local/bin/
 
 EXPOSE 80
 
@@ -311,7 +308,7 @@ ENTRYPOINT ["/usr/local/bin/docker-entrypoint.sh"]
 RUN echo "ServerName localhost" > /etc/apache2/conf-available/servername.conf
 RUN a2enconf servername
 
-CMD ["apache2-foreground"]
+CMD ["apache2-background"]
 
 # |--------------------------------------------------------------------------
 # | Entrypoint

utils/Dockerfile.slim.blueprint

@@ -196,10 +196,7 @@ RUN a2enconf docker-php
 ENV PHP_EXTRA_BUILD_DEPS apache2-dev
 ENV PHP_EXTRA_CONFIGURE_ARGS --with-apxs2 --disable-cgi
 
-# https://httpd.apache.org/docs/2.4/stopping.html#gracefulstop
-STOPSIGNAL SIGWINCH
-
-COPY utils/apache2-foreground /usr/local/bin/
+COPY utils/apache2-background /usr/local/bin/
 
 EXPOSE 80
 
@@ -329,7 +326,7 @@ ENTRYPOINT ["/usr/local/bin/docker-entrypoint.sh"]
 RUN echo "ServerName localhost" > /etc/apache2/conf-available/servername.conf
 RUN a2enconf servername
 
-CMD ["apache2-foreground"]
+CMD ["apache2-background"]
 
 # |--------------------------------------------------------------------------
 # | Entrypoint

utils/apache2-foreground → utils/apache2-background

@@ -37,4 +37,25 @@ for e in "${!APACHE_@}"; do
 	fi
 done
 
-exec apache2 -DFOREGROUND "$@"
+_shutdown() {
+  echo "Stopping Apache2 graceful..."
+
+  pid=$(cat "/var/run/apache2/apache2.pid")
+  apachectl graceful-stop
+
+  echo "Waiting for PID $pid to exit..."
+  tail --pid=$pid -f /dev/null
+
+  echo "Exiting..."
+  stop=true
+}
+
+stop=false
+trap _shutdown SIGTERM
+
+echo "Starting Apache2 in the background..."
+apache2 -k start "$@"
+
+while [ "$stop" = false ]; do
+	sleep 0.5;
+done

utils/docker-entrypoint-as-root.sh

@@ -145,7 +145,7 @@ else
 fi
 
 # We should run the command with the user of the directory... (unless this is Apache, that must run as root...)
-if [[ "$@" == "apache2-foreground" ]]; then
+if [[ "$@" == "apache2-background" ]]; then
     /usr/local/bin/apache-expose-envvars.sh;
     exec "$@";
 else