# Creating the Base Docker Image

The content of the container that will run on OpenShift derives from a Docker image that is first created and then hosted in a Docker registry.

To create an EMS Docker image, use the samples/docker/tibemscreateimage script on a machine equipped for building Docker images.

This script needs to be pointed to the software packages to be installed:

- EMS installation package
- Optional EMS hotfixes
- The Java package (optional)

The script also lets you choose whether to save the image as an archive and creates a user and group set to the required `uid` and `gid` values to bypass the lack of a `runAsGroup` OpenShift feature mentioned in section Control Access to NFS Shared Folders.

The following command creates a Docker image based on the EMS 8.5 Linux installation package, adding a JVM, the `12500 uid` and the `9500 gid`.

    > tibemscreateimage TIB_ems_8.5.0_linux_x86_64.zip \
                     -j <JRE installation package>.tar.gz \
                     -u 12500 \
                     -g 9500

The following examples illustrate how you can experiment with that Docker image:

- This following command creates a sample EMS server folder hierarchy and configuration in the current directory and starts the corresponding server:

      > docker run -p 7222:7222 -v `pwd`:/shared ems:8.5.0 tibemsd

- To create a sample Central Administration server folder hierarchy and configuration in the current directory and starts the corresponding server:

      > docker run -p 8080:8080 -v `pwd`:/shared ems:8.5.0 tibemsca

- You can override the creation and use of the sample configuration with your own setup. The following example starts an EMS server using the <path to shared location>/<your server config file> configuration.

      > docker run -p 7222:7222 -v <path to shared location>:/shared \
        ems:8.5.0 tibemsd -config /shared/<your server config file>

You can modify the `tibemscreateimage` script to suit your environment.

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