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Chapter 5. Building functions

To run a function, you first must build the function project. This happens automatically when using the kn func run command, but you can also build a function without running it.

5.1. Building a function
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Before you can run a function, you must build the function project. When you run the kn func run command, the system builds the function automatically. However, you can use the kn func build command to build a function without running it, which can be useful for advanced users or debugging scenarios.

You can run the kn func build command to create an OCI container image that you can run locally on your computer or on an OpenShift Container Platform cluster. This command uses the function project name and the image registry name to construct a fully qualified image name for your function.

5.1.1. Image container types
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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

5.1.2. Image registry types
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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

5.1.3. Push flag
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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

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

$ kn func help build
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