133-crossplane-apps.sh

# Source: https://gist.github.com/57689b4095d9c7825baef3c2aec201ea

#######################################################################
# How To Manage Kubernetes Applications Using Crossplane Compositions #
# https://youtu.be/eIQpGXUGEow                                        #
#######################################################################

# Referenced videos:
# - Production-Ready Kubernetes Clusters Using Crossplane Compositions: https://youtu.be/uMC2QQfMctg
# - How To Shift Left Infrastructure Management Using Crossplane Compositions: https://youtu.be/AtbS1u2j7po

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

# Watch https://youtu.be/BII6ZY2Rnlc if you are not familiar with GitHub CLI
gh repo fork vfarcic/devops-toolkit-crossplane \
    --clone

cd devops-toolkit-crossplane

# Using Rancher Desktop for the demo, but it can be any other Kubernetes cluster with Ingress

# If not using Rancher Desktop, replace `127.0.0.1` with the base host accessible through NGINX Ingress
export INGRESS_HOST=127.0.0.1

kubectl create namespace a-team

cat examples/app-frontend.yaml \
    | sed -e "s@host: .*@host: devops-toolkit.$INGRESS_HOST.nip.io@g" \
    | tee examples/app-frontend.yaml

####################
# Setup Crossplane #
####################

helm repo add crossplane-stable \
    https://charts.crossplane.io/stable

helm repo update

helm upgrade --install \
    crossplane crossplane-stable/crossplane \
    --namespace crossplane-system \
    --create-namespace \
    --wait

kubectl apply \
    --filename crossplane-config/provider-kubernetes-incluster.yaml

kubectl apply \
    --filename crossplane-config/config-app.yaml

########
# Demo #
########

cat examples/app-frontend.yaml

# GitOps?

kubectl --namespace a-team apply \
    --filename examples/app-frontend.yaml

kubectl --namespace a-team get appclaims

kubectl --namespace a-team \
    get all,ingresses

echo "http://devops-toolkit.$INGRESS_HOST.nip.io"

# Open it in a browser

cat examples/app/backend.yaml

kubectl --namespace a-team apply \
    --filename examples/app/backend.yaml

kubectl --namespace a-team \
    get all,ingresses

# Change `spec.parameters.image` to `vfarcic/devops-toolkit-series:4.1.0` in `examples/app-frontend.yaml`

kubectl --namespace a-team apply \
    --filename examples/app-frontend.yaml

cat crossplane-config/config-app.yaml

cat packages/app/definition.yaml

cat packages/app/frontend.yaml

cat packages/app/backend.yaml

# Those were simple examples!

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

kubectl --namespace a-team delete \
    --filename examples/app-frontend.yaml

kubectl --namespace a-team delete \
    --filename examples/app/backend.yaml

kubectl get objects

kubectl --namespace a-team get all

cat examples/app-frontend.yaml \
    | sed -e "s@image: .*@image: vfarcic/devops-toolkit-series:4.0.0@g" \
    | tee examples/app-frontend.yaml