181-kpt.sh

# Source: https://gist.github.com/497a72d63c159e93f7351480f7506c05

######################################################################
# kpt YAML Transformation - No Helm Templates, No Kustomize Overlays #
# https://youtu.be/Wavigyq7NdQ                                       #
######################################################################

# Additional Info:
# - kpt: https://kpt.dev
# - How To Write And Test Kubernetes Manifests With Datree: https://youtu.be/3jZTqCETW2w
# - Helm vs Kustomize - The Fight Between Templating and Patching in Kubernetes: https://youtu.be/ZMFYSm0ldQ0

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

# Install `kpt` CLI from https://kpt.dev/installation/kpt-cli

# Install `datee` CLI from https://hub.datree.io/#1-install-the-datree-cli

# Make sure that Docker and a Kubernetes cluster are running

kubectl create namespace a-team

git clone https://github.com/vfarcic/kpt-demo

cd kpt-demo

###############
# Explore kpt #
###############

ls -1 base/

datree test base/*.yaml

cat base/*.yaml

kpt pkg tree

kpt fn eval base \
    --image gcr.io/kpt-fn/set-labels:v0.1.5 \
    -- app=devops-toolkit

git status

git diff base/*.yaml

git add .

git commit -m "Labels"

datree test base/*.yaml

kpt fn eval --image set-namespace:v0.1 \
  -- namespace=a-team

git diff base/*.yaml

git add .

git commit -m "Namespace"

datree test base/*.yaml

cat Kptfile

kpt fn render

git diff base/*.yaml

git add .

git commit -m "Labels"

kpt live init

git diff Kptfile

kpt live apply --reconcile-timeout=15m

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

kubectl --namespace a-team \
    get deployment devops-toolkit \
    --output yaml

# Open https://catalog.kpt.dev

# Open https://kpt.dev/gitops/configsync/

# Open https://github.com/argoproj/argo-cd/issues/3360

kpt fn source base \
    | kpt fn eval - \
    --image set-image:v0.1.1 \
    -- \
    name=vfarcic/devops-toolkit-series \
    newName=vfarcic/devops-toolkit-series \
    newTag=5.0.5 \
    | kpt fn eval - \
    --image set-namespace:v0.4.1 \
    -- \
    namespace=prod \
    | kpt fn sink prod

kpt pkg tree

cat prod/deployment.yaml

cd ..

kpt pkg get https://github.com/GoogleContainerTools/kpt.git/package-examples/wordpress@v0.9

cd wordpress

cat Kptfile

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

cd ../kpt-demo

kpt live destroy

# Destroy or reset the Kubernetes cluster