Deploying Pre-Built Functions

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Motivation

If you followed the function-deployment guide, you built and deployed a function in a single convenient step using the nuctl CLI. However, it is sometimes desirable to build a function once and deploy it many times with different configuration. This guide will walk you through that process using nuctl.

In this scenario, you’ll use the Go hello-world example example.

Building a function

Using nuctl, you can issue a build - specifying the URL of the Go hello-world:

nuctl build hello-world --path https://raw.githubusercontent.com/nuclio/nuclio/master/hack/examples/golang/helloworld/helloworld.go \
    --registry $(minikube ip):5000

This produces the nuclio/processor-hello-world:latest image and pushes it to 192.168.64.8:5000. The image contains everything the function needs to run, except a configuration file.

Deploying the pre-built function

To deploy the function to your platform, you’ll use the nuctl deploy command with the --run-image option. When --run-image is present, nuctl does not initiate a build process - only creates a function in the platform and waits for it to become ready.

nuctl kubdeploy hello-world --run-image localhost:5000/nuclio/processor-hello-world:latest \
    --runtime golang \
    --handler main:Handler \
    --namespace nuclio

You can deploy this function several times, providing different labels, triggers, etc. - yet still use the same image.

See also