Kustomize - How to Simplify Kubernetes Configuration Management

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

$ curl -s "https://raw.githubusercontent.com/\
kubernetes-sigs/kustomize/master/hack/install_kustomize.sh"  | bash && chmod +x kustomize && sudo mv kustomize /usr/local/bin/

################################
# Exploring kustomization.yaml
################################

git clone https://github.com/vfarcic/argocd-production.git

cd argocd-production

ls -1

ls -1 argo-workflows

cd argo-workflows

ls -1 base/

cat base/kustomization.yaml

https://github.com/argoproj/argo/blob/master/manifests/base/kustomization.yaml

https://github.com/argoproj/argo/blob/master/manifests/base/workflow-controller/workflow-controller-configmap.yaml

cat base/config.yaml

###########################
# Applying base manifests
###########################

$ kustomize build base

$ kustomize build base \
 | kubectl apply --filename -

#####################
# Applying overlays
#####################

$ kubectl --namespace argo get ingresses

$ ls -1 overlays/production/

$ cat overlays/production/kustomization.yaml

$ cat overlays/production/ingress_patch.json

$ kustomize build overlays/production \
 | kubectl apply --filename -

$ kubectl --namespace argo get ingresses

##########################
# Upgrading applications
##########################

$ kubectl --namespace argo \
    get deployment argo-server \
    --output yaml

$ cd overlays/production

$ kustomize edit set image \
    argoproj/argocli=argoproj/argocli:v2.12.4

$ cat kustomization.yaml

$ cd ../../

$ kustomize build \
    overlays/production \
    | kubectl apply --filename -

$ kubectl --namespace argo \
    get deployment argo-server \
    --output yaml