216-ingress.sh

# Source: https://gist.github.com/5c39b866a77c33a2863d67deb5d24682

####################################################
# What Is Kubernetes Ingress And How Does It Work? #
# https://youtu.be/HqTEHVlQpwY                     #
####################################################

# Additional Info:
# - Contour: https://projectcontour.io

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

# Create a Kubernetes cluster (NOT a local one like Minikube, Docker Desktop, Rancher Desktop, etc.)

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

cd contour-demo

kubectl create namespace demo

kubectl apply \
    --filename https://projectcontour.io/quickstart/contour-gateway-provisioner.yaml

kubectl apply --filename gateway.yaml

# If NOT EKS
export INGRESS_HOST=$(kubectl --namespace projectcontour \
    get service envoy-contour \
    --output jsonpath="{.status.loadBalancer.ingress[0].ip}")

# If EKS
export INGRESS_HOSTNAME=$(kubectl --namespace projectcontour \
    get service envoy-contour \
    --output jsonpath="{.status.loadBalancer.ingress[0].hostname}")

# If EKS
export INGRESS_HOST=$(dig +short $INGRESS_HOSTNAME) 

echo $INGRESS_HOST

# Repeat the `export` command(s) if the output is empty.

# If the output contains more than one IP, wait for a while longer, and repeat the `export` commands.

# If the output continues having more than one IP, choose one of them and execute `export INGRESS_HOST=[...]` with `[...]` being the selected IP.

# Install `yq` from https://github.com/mikefarah/yq if you do not have it already
yq --inplace \
    ".spec.rules[0].host = \"silly-demo.$INGRESS_HOST.nip.io\"" \
    k8s/ingress.yaml

yq --inplace \
    ".spec.hostnames[0] = \"silly-demo2.$INGRESS_HOST.nip.io\"" \
    k8s/route.yaml

################################
# How Kubernetes Ingress Works #
################################

kubectl --namespace demo apply --filename k8s

curl "http://silly-demo.$INGRESS_HOST.nip.io"

kubectl --namespace projectcontour get pods

kubectl --namespace projectcontour get services

cat k8s/ingress.yaml

cat k8s/service.yaml

cat k8s/deployment.yaml

kubectl --namespace demo get pods

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

# Destroy or reset the cluster