Tomcat with Manager-GUI

Tomcat-8 containers do not the Manager app enables by default. This container simply activates the default webapps and enables an admin user to access those apps (e.g., manager). The reason why the manager, host-manager and other interfaces are not enabled by default is security. Very reasonable.

To not expose wildly sensitive information/apps through this container, a simple system for assigning user/password to those management apps has been implemented. See How to use section.

For more information about Tomcat and its Manager interface, check

• https://tomcat.apache.org/tomcat-8.5-doc/manager-howto.html

The actual modifications were based on the SO answers:

• https://stackoverflow.com/a/21743777/687896
• https://stackoverflow.com/a/36773669/687896

How to use

The image created by this Dockerfile is at chbrandt/tomcat-manager, it inherits from tomcat:8 and so it exposes port 8080 by default.

When you run the image you will notice an output message providing user and password strings. Those are the credentials to use in http://localhost:8080/manager for instance. The default user name is tomcat, password is randomly generated each time the container runs.

Simple example binding port 8080 to localhost:

$ docker run -it -p 8080:8080 chbrandt/tomcat-manager

Give custom credentials

If you want to use your own credentials -- user/password -- you can user variables:

• TOMCAT_USER
• TOMCAT_PASSWORD during docker run call:

$ docker run -it -p 8080:8080 \
  -e TOMCAT_USER=admin \
  -e TOMCAT_PASSWORD=good-password \
  chbrandt/tomcat-manager

Where you set admin and good-password as username and password, resp.

Further discussions

About tomcat default image not providing default webapps anymore (which is undone by this container -- default apps are back here):

• docker-library/tomcat#124
• docker-library/tomcat#181

/.\