204-knative-functions.sh

# Source: https://gist.github.com/d715c251f851cf28b863ad5414de7de0

##########################################################################
# Knative Functions - No Dockerfile, No Lock-In, No Kubernetes Knowledge #
# https://youtu.be/VjI5WDOhAwk                                           #
##########################################################################

# Additional Info:
# - Knative Functions: https://github.com/knative/func
# - Serverless Computing With Knative And Containers As A Service (CaaS): https://youtu.be/8vrLEbwSu7U
# - Container (Docker) Images Without Dockerfile With Buildpacks and kpack: https://youtu.be/fbSoKu8NGSU

#########
# Setup #
#########

# Create a Kubernetes cluster.
# The Gist has been tested with a "real" Kubernetes cluster.
# If you are using a local cluster (e.g., Docker Desktop, Minikube, Rancher Desktop, etc.), you might need to modify some of the commands and manifests.

# Install the `kn` CLI from https://knative.dev/docs/getting-started/quickstart-install/#install-the-knative-cli
# Install the `func` CLI from https://knative.dev/docs/functions/install-func/#installing-the-func-cli

kubectl apply \
    --filename https://github.com/knative/serving/releases/download/knative-v1.8.0/serving-crds.yaml

kubectl apply \
    --filename https://github.com/knative/serving/releases/download/knative-v1.8.0/serving-core.yaml

kubectl --namespace knative-serving get pods

# Wait until all the Pods are in the "Running" state.

kubectl apply \
    --filename https://github.com/knative/net-kourier/releases/download/knative-v1.8.0/kourier.yaml

kubectl --namespace kourier-system get pods

# Wait until all the Pods are in the "Running" state.

kubectl --namespace knative-serving \
    patch configmap config-network \
    --type merge \
    --patch '{"data":{"ingress-class":"kourier.ingress.networking.knative.dev"}}'

kubectl apply \
    --filename https://github.com/knative/serving/releases/download/knative-v1.8.0/serving-default-domain.yaml

kubectl apply \
    --filename https://github.com/knative/eventing/releases/download/knative-v1.8.0/eventing-crds.yaml

kubectl apply \
    --filename https://github.com/knative/eventing/releases/download/knative-v1.8.0/eventing-core.yaml

# Change `docker.io/vfarcic` with the address of the container registry you'd like to use
export CONTAINER_REGISTRY=docker.io/vfarcic

kubectl create namespace production

# Make sure that Docker or Podman are installed.
# If using Podman, make sure that the CLI is aliased as `docker`.

#################################################
# Self-Managed Functions With Knative Functions #
#################################################

func create --language go knative-functions-demo

cd knative-functions-demo

cat func.yaml

ls -1

cat handle.go

func run --build --registry $CONTAINER_REGISTRY

# Open `http://localhost:8080` in a browser

# ctrl+c

func build --image $CONTAINER_REGISTRY/silly-demo-knf

docker image ls

func --namespace production deploy

# Open the address from the output

func --namespace production invoke

func --namespace production list

kubectl --namespace production get all

func --namespace production info

func --namespace production delete

###########
# Destroy #
###########

cd ..

rm -rf knative-functions-demo