Chapter 5. Building functions

By default, kn func build creates a container image by using Red Hat Source-to-Image (S2I) technology.

You can build a function by using Red Hat Source-to-Image (S2I):

$ kn func build

By default, the system stores function images in the OpenShift Container Registry.

You can build a function by using the OpenShift Container Registry:

$ kn func build

You get an output similar to the following example:

Building function image
Function image has been built, image: registry.redhat.io/example/example-function:latest

You can override using OpenShift Container Registry as the default image registry by using the --registry flag:

$ kn func build --registry quay.io/username

You get an output similar to the following example:

Building function image
Function image has been built, image: quay.io/username/example-function:latest

You can add the --push flag to a kn func build command to automatically push the function image after it is successfully built:

$ kn func build --push

You can use the help command to learn more about kn func build command options:

$ kn func help build