Preparing image descriptor

This section will guide you through a very simple example.

  1. Using a standard text editor create an empty image.yaml file. It is recommended to use the image.yaml naming scheme.

  2. As described in Image Descriptor several values are mandatory. Add the following to the file:

name: my-example
version: 1.0
from: centos:7

  • Next, while optional, it is recommended to add a suitable description tag e.g.

description: My Example Tomcat Image

While this configuration will build in CEKit it isn’t very interesting as it will simply create another image layered on top of CentOS 7. The descriptor should now look like:

image.yaml
 name: my-example
 version: 1.0
 from: centos:7
 description: My Example Tomcat Image

It is possible to directly add further content to the image at this point through a variety of methods. Labels, ports, packages etc can be used - see here. In general modules are used as the ‘building blocks’ to assemble the image - they can be used as individual libraries or shared blocks across multiple images. So, move onto to modules to discover more about these.