Logging via volume appears to work

.gitignore

@@ -9,22 +9,5 @@ bin/start.sh
 bin/stop.sh
 root/**
 shibboleth-identity-provider.tar.gz
-test.log
-bin/build.sh
-bin/destroy.sh
-bin/install.sh
-bin/rebuild.sh
-bin/rerun.sh
-bin/run.sh
-bin/start.sh
-bin/stop.sh
-bin/test.sh
-bin/build.sh
-bin/destroy.sh
-bin/install.sh
-bin/rebuild.sh
-bin/rerun.sh
-bin/run.sh
-bin/start.sh
-bin/stop.sh
-bin/test.sh
+logs/tomcat/**
+logs/shibboleth_idp/**

Dockerfile

@@ -10,7 +10,11 @@ RUN chown -R root:root /opt/shibboleth/shibboleth-identity-provider-$version &&
     rm -rf /usr/local/tomcat/webapps/* && \
     ANT_OPTS="-Didp.target.dir=/opt/shibboleth/current" /opt/shibboleth/current/bin/build.sh && \
     ln -s /opt/shibboleth/current /opt/shibboleth-idp && \
-    ln -s /opt/shibboleth-idp/war/idp.war $CATALINA_HOME/webapps/ROOT.war
+    ln -s /opt/shibboleth-idp/war/idp.war $CATALINA_HOME/webapps/ROOT.war && \
+    touch /usr/local/tomcat/logs/voltest && \
+    touch /opt/shibboleth/shibboleth-identity-provider-$version/logs/voltest
+
+VOLUME ["/usr/local/tomcat/logs", "/opt/shibboleth/shibboleth-identity-provider-$VERSION/logs"]
 
 EXPOSE 8080
 CMD ["catalina.sh", "run"]