In this section, we will modify the docker image for the Ubuntu 18.04 application image.
Modify Docker Image
In this section, we modify the Ubuntu 18.04 application Docker image
defaultImageRepoTag so that we can provide a custom Docker image.
defaultImageRepoTag is set to
localhost:5000/myubuntu:1.0 (we will create this image in the steps below).
The full json should now look like this:
We need to create a
Dockerfile - let's create a new folder for it inside
Now create a Dockerfile in the folder
myubuntu with the contents:
yourname to your name without spaces or special characters.
Run a local registry
To make development easier, we will deploy a local registry to push our custom image to:
Build and Push image
In the terminal, change to the
myubuntu folder and build your custom image and push it to the local registry:
Next we push the image to our local registry:
Deploy the KD app image
First ensure you aren't still running an Ubuntu KD clusters from the previous tutorial.
Next undeploy the existing Ubuntu KD application image definition:
Deploy the new Ubuntu KD application with your changes:
Check the deployement was successful:
You can see my image has only just been deployed:
Deploy the KD Cluster
Next we can deploy the KD Cluster:
We can then run
ls / inside the cluster to see the file we created in our Docker image
In this lesson we saw how
You can find the:
If a KD Application has multiple roles (covered later), you can specify the
imageRepoTag for each role: