Docker commit not saving files

Question

I'm running a glyptodon/guacamole in a docker.

I want to enable the db auth extension and the process is to move guacamole-auth-jdbc-mysql-0.9.9.jar from GUACAMOLE_HOME/extensions to GUACAMOLE_HOME/lib, and then restart the process.

I am do the following:

># docker exec -it some-guacamole bash
># cp /root/.guacamole/extensions/guacamole-auth-jdbc-mysql-0.9.9.jar /root/.guacamole/lib/
># exit
># docker commit <container id> adampski:dbauthv1
># docker stop some-guacamole
># docker rm some-guacamole
># docker run --name some-guacamole --link some-guacd:guacd --link some-mysql:mysql -e MYSQL_DATABASE=guacamole_db -e MYSQL_USER=username -e MYSQL_PASSWORD=password -d -p 8080:8080 adampski:dbauthv1

However when I enter the docker with bash and browse to /root/.guacamole/lib/, I do not see the file in there.

My understanding is that since I updated the image and ran docker run referencing the new image + tag, then it should run a new container with the changes - what am I doing wrong?

Answer 1

I created a workaround to my problem by pulling the repository, editing start.sh to add guacamole-auth-jdbc-mysql-0.9.9.jar to $GUACAMOLE_LIB. The Dockerfile calls this script when creating the image.