02-03-kustomize-vs-helm.sh

# Source: https://gist.github.com/764b402c8979678dfde01fd8f63c22e2

###########################################################
# Kustomize vs Helm                                       #
# The Fight Between Templating and Patching in Kubernetes #
# https://youtu.be/ZMFYSm0ldQ0                            #
###########################################################

# Links to referenced videos:
# - https://youtu.be/sUPkGChvD54

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

minikube start

minikube addons enable ingress

git clone https://github.com/vfarcic/helm-vs-kustomize.git

cd helm-vs-kustomize

#########################
# Defining applications #
#########################

# Helm
cat helm/templates/ingress.yaml

# Kustomize
cat kustomize/base/ingress.yaml

# Helm
cat helm/values.yaml

# Kustomize
cat kustomize/base/kustomization.yaml

# Helm
helm upgrade --install \
    devops-toolkit helm \
    --namespace helm-dev \
    --create-namespace

# Kustomize
kubectl create namespace kustomize-dev

# Kustomize
kustomize build \
    kustomize/base \
    | kubectl --namespace kustomize-dev \
    apply --filename -

#############################################
# Defining environment-specific application #
#############################################

# Helm
cat helm/values-production.yaml

# Kustomize
cat kustomize/overlays/production/kustomization.yaml

# Kustomize
cat kustomize/overlays/production/ingress-patch.yaml

# Helm
helm upgrade --install \
    devops-toolkit helm \
    --namespace helm-production \
    --create-namespace \
    --values helm/values-production.yaml

# Kustomize
kustomize build \
    kustomize/overlays/production \
    | kubectl apply --filename -

#####################################
# Applying unplanned customizations #
#####################################

# Helm
vim helm/values.yaml

# Helm
cat snippets/deployment-resources.yaml

# Helm
vim helm/templates/deployment.yaml

# Kustomize
cat kustomize/overlays/production/deployment-patch.yaml

# Kustomize
vim kustomize/overlays/production/kustomization.yaml

# Helm
vim helm/values-production.yaml

They are not the same. kustomize is currently v3.x while kubectl -k uses Kustomize v2.x.