151-carvel-ytt.sh

# Source: https://gist.github.com/d56800b720e4d5c54e2c805ae04bc19c

################################################
# Carvel ytt Instead Of Helm?                  #
# A Better Way To Manage Kubernetes Resources? #
# https://youtu.be/DLnXkH2keNg                 #
################################################

# Additional Info:
# - Carvel ytt: https://carvel.dev/ytt
# - Kustomize - How to Simplify Kubernetes Configuration Management: https://youtu.be/Twtbg6LFnAg
# - Helm vs Kustomize - The Fight Between Templating and Patching in Kubernetes: https://youtu.be/ZMFYSm0ldQ0
# - Helm And Kustomize Replacement? Jsonnet With Grafana Tanka: https://youtu.be/-qpcsUXElYc
# - Should We Replace Docker Desktop With Rancher Desktop?: https://youtu.be/bYVfCp9dRTE

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

# Create a Kubernetes cluster

# This demo was tested on Rancher Desktop, but it should work with any Kubernetes cluster
# Please watch https://youtu.be/bYVfCp9dRTE if you are not familiar with Rancher Desktop

# Install ytt from https://carvel.dev/ytt/docs/v0.41.0/install/

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

cd ytt-demo

kubectl create namespace production

####################
# Using Carvel ytt #
####################

ytt --file ytt/_ytt_lib/resources/

ls -1 ytt/_ytt_lib/resources/

cat ytt/_ytt_lib/resources/schema.yaml

cat ytt/_ytt_lib/resources/labels.lib.yaml

cat ytt/_ytt_lib/resources/config.yaml

ytt --file ytt/

ls -1 ytt/

cat ytt/config.yaml

cat ytt/values.yaml

ytt --file ytt/ \
    --data-values-file values-dev.yaml

ytt --file ytt/ \
    --data-values-file values-staging.yaml

cat values-dev.yaml

cat values-staging.yaml

ytt --file ytt/ \
    --data-values-file values-staging.yaml \
    | kubectl --namespace production \
    apply --filename -

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

ytt --file ytt/ \
    --data-values-file values-staging.yaml \
    | kubectl --namespace production \
    delete --filename -

kubectl delete namespace production