126-linkerd-intro.sh

#########################################################
# What Is Linkerd Service Mesh? Linkerd Tutorial Part 1 #
# https://youtu.be/mDC3KA_6vfg                          #
#########################################################

# Referenced videos:
# - Service Mesh In Kubernetes Explained: https://youtu.be/cjhb7_uwzDk
# - Should We Replace Docker Desktop With Rancher Desktop?: https://youtu.be/bYVfCp9dRTE
# - 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
# - Argo CD - Applying GitOps Principles To Manage Production Environment In Kubernetes: https://youtu.be/vpWQeoaiRM4
# - Flux CD v2 With GitOps Toolkit - Kubernetes Deployment And Sync Mechanism: https://youtu.be/R6OeIgb7lUI

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

gh repo fork vfarcic/linkerd-demo \
    --clone

cd linkerd-demo

# Create a Kubernetes cluster with Ingress
# 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

# Replace `127.0.0.1` with the Ingress Service IP if not using Rancher Desktop
export INGRESS_IP=127.0.0.1

cat kustomize/overlays/production/ingress.yaml \
    | sed -e "s@host: .*@host: dot.$INGRESS_IP.nip.io@g" \
    | tee kustomize/overlays/production/ingress.yaml

kubectl create namespace production

#############################
# Install and setup Linkerd #
#############################

curl -sL https://run.Linkerd.io/install \
    | sh

linkerd check --pre

linkerd install

linkerd install \
    | kubectl apply --filename -

linkerd check

linkerd viz install \
    | kubectl apply --filename -

linkerd jaeger install \
    | kubectl apply --filename -

Linkerd check

###########################
# Linkerd Proxy Injection #
###########################

cat kustomize/base/deployment.yaml

cat kustomize/overlays/production/ingress.yaml

# Watch https://youtu.be/Twtbg6LFnAg if you are not familiar with Kustomize
kubectl apply \
    --kustomize kustomize/overlays/production

# It could be `linkerd inject -` instead; a bad idea

kubectl --namespace production get pods

echo http://dot.$INGRESS_IP.nip.io

# Open it in a browser

##############################
# Observability With Linkerd #
##############################

# Install the latest release of the Ddosify CLI from https://github.com/ddosify/ddosify/releases

ddosify -t "http://dot.$INGRESS_IP.nip.io"

linkerd --namespace production \
    viz stat deploy/devops-toolkit

linkerd --namespace production \
    viz top deploy/devops-toolkit

linkerd viz dashboard &

ddosify -config ddosify.json