Adding comments explaining log path, access log

Dockerfile

@@ -5,6 +5,11 @@ ARG SERVER_XML=server.xml
 ARG LOGGING_PROPERTIES=logging.properties
 ARG CATALINA_PROPERTIES=catalina.properties
 ARG TOMCAT_MAJOR=9
+
+# As provided here, only the access log gets written to this location.
+# Mount to a persistant volume to preserve access logs.
+# Modify this value to specify a different log directory.
+# e.g. /home/logs in Azure App Service
 ENV LOG_ROOT=/tomcat_logs
 
 ENV PATH /usr/local/tomcat/bin:$PATH

logging.properties

@@ -14,7 +14,7 @@
 # limitations under the License.
 
 
-# This file has been modified from Tomcat's original to redirect all loging to the console.
+# This file has been modified from Tomcat's original to redirect all logging to the console.
 # Console output of containers can be consumed by Azure Monitor and other services.
 
 # For more information about enabling Azure Monitor for Containers, see

startup.sh

@@ -1,5 +1,7 @@
 #!/bin/sh
 
+# Create a log directory for each hostname in case a shared file system is used among multiple hosts or containers.
+# As provided in the default configuration, only the access log gets written to this directory.
 LOG_DIR="${LOG_ROOT}/$(hostname)"
 mkdir -p "${LOG_DIR}"
 export JAVA_OPTS="${JAVA_OPTS} -Dlog.base=${LOG_DIR}"