Added volumes to hold all data, updated readme.

Dockerfile

@@ -40,7 +40,7 @@ RUN lighty-enable-mod dokuwiki fastcgi accesslog
 RUN mkdir /var/run/lighttpd && chown www-data.www-data /var/run/lighttpd
 
 EXPOSE 80
-VOLUME ["/dokuwiki/data/", "/var/log/"]
+VOLUME ["/dokuwiki/data/","/dokuwiki/lib/plugins/","/dokuwiki/conf/","/dokuwiki/lib/tpl/","/var/log/"]
 
 ENTRYPOINT ["/usr/sbin/lighttpd", "-D", "-f", "/etc/lighttpd/lighttpd.conf"]
 

README.md

@@ -12,6 +12,25 @@ You can now visit the install page to configure your new DokuWiki wiki.
 For example, if you are running container locally, you can acces the page 
 in browser by going to http://127.0.0.1/install.php
 
+To upate the image:
+-------------------
+
+First stop your container
+
+	docker stop my_wiki
+
+Then run new container just to hold the volumes
+
+	docker run --volumes-from my_wiki --name my_wiki_data busybox true
+
+Now you can remove old container
+
+	docker rm my_wiki
+
+..and run a new one (you built, pulled before)
+
+	docker run -d -p 80:80 --name my_wiki --volumes-from my_wiki_data mprasil/dokuwiki 
+
 Optimizing your wiki
 --------------------