Adding description in README.md file

Author: taufort

README.md

@@ -1,2 +1,44 @@
 # tomcat-docker
 An example of an docker image containing tomcat 8 and oracle jdk 8
+
+## To run with tomcat maven plugin on local env
+
+* mvn clean install
+* mvn tomcat7:run
+
+## To run dockerfile
+
+### MAVEN
+mvn clean install -P docker
+
+### DOCKER COMMAND LINES
+* First copy paste the war from target directory to target/docker directory
+```sh
+$ cp target/tomcat-docker-1.0.0-SNAPSHOT.war target/docker/
+```
+
+* Then build the docker image (it can take some time as it's curling oracle jdk and tomcat 8)
+```sh
+docker build -t tomcat-docker target/docker/
+```
+
+* Finally you're good to start the image in the background
+```sh
+docker run -d -p 8080:8080 tomcat-docker
+```
+* To connect in ssh to docker image with bash
+```sh
+docker exec -it ${IMAGE_ID_GENERATED_BY_DOCKER} bash
+```
+* To stop the container
+```sh
+docker stop $(docker ps -q --filter ancestor=tomcat-docker:1.0.0-SNAPSHOT)
+```
+## Check that the app is running
+
+http://localhost:8080/tomcatDocker/index.xhtml
+
+## About logs
+Logs are written in docker image. /log/ for the application and /opt/tomcat/logs for tomcat.
+This is not a good practice, it is better to use a mount point to write logs on a NAS (check
+docker directive VOLUME to do that).