presentation.sh

######################
# Creating A Cluster #
######################

minikube start \
    --vm-driver virtualbox \
    --cpus 4 \
    --memory 8192

minikube addons enable default-storageclass

minikube addons enable storage-provisioner

istioctl manifest apply \
    --set profile=demo

kubectl apply \
    --kustomize github.com/weaveworks/flagger/kustomize/istio

#####################
# Deploying The App #
#####################

git clone \
    https://github.com/vfarcic/go-demo-7.git     

cd go-demo-7

git pull

kubectl create namespace go-demo-7

kubectl label namespace go-demo-7 \
    istio-injection=enabled

kubectl --namespace go-demo-7 apply \
    --filename k8s/db \
    --recursive

ls -l k8s/app

cat k8s/app/*

kubectl --namespace go-demo-7 apply \
    --filename k8s/app \
    --recursive

export INGRESS_PORT=$(kubectl \
    --namespace istio-system \
    get service istio-ingressgateway \
    --output jsonpath='{.spec.ports[?(@.name=="http2")].nodePort}')

export INGRESS_HOST=$(minikube ip):$INGRESS_PORT

echo $INGRESS_HOST

curl -v -H "Host: go-demo-7.acme.com" \
    "http://$INGRESS_HOST/version"

kubectl --namespace go-demo-7 \
    get gateways,ingresses

##############################
# Deploying Flagger Resource #
##############################

cat k8s/istio/flagger/exercise/flagger.yaml

kubectl --namespace go-demo-7 apply \
    --filename k8s/istio/flagger/exercise/flagger.yaml

cat k8s/istio/flagger/exercise/gateway.yaml

kubectl --namespace go-demo-7 apply \
    --filename k8s/istio/flagger/exercise/gateway.yaml

kubectl --namespace go-demo-7 \
    get deployments

kubectl --namespace go-demo-7 \
    rollout status \
    deployment go-demo-7-primary

kubectl --namespace go-demo-7 \
    get hpa

# Might be `<unknown>` if metrics server is not installed

for i in {1..10}; do 
    curl -H "Host: go-demo-7.acme.com" \
        "http://$INGRESS_HOST/version"
    sleep 0.25
done

kubectl --namespace go-demo-7 \
    get services

kubectl --namespace go-demo-7 \
    get destinationrules

kubectl --namespace go-demo-7 \
    get virtualservices

kubectl --namespace go-demo-7 \
    get canaries

kubectl --namespace go-demo-7 \
    describe canary go-demo-7

###########################
# Deploying A New Release #
###########################

cat k8s/istio/flagger/exercise/deployment-0-0-2.yaml

diff k8s/app/deployment.yaml \
    k8s/istio/flagger/exercise/deployment-0-0-2.yaml

echo $INGRESS_HOST

# Open a second terminal session

export INGRESS_HOST=[...]

while true; do 
    curl -H "Host: go-demo-7.acme.com" \
        "http://$INGRESS_HOST/version"
    sleep 1
done

# Go back to the first terminal session

kubectl --namespace go-demo-7 apply \
    --filename k8s/istio/flagger/exercise/deployment-0-0-2.yaml

kubectl --namespace go-demo-7 \
    get deployments

kubectl --namespace go-demo-7 \
    get virtualservices

kubectl --namespace go-demo-7 \
    describe virtualservice go-demo-7

kubectl --namespace go-demo-7 \
    get pods

kubectl --namespace go-demo-7 \
    get canaries

kubectl --namespace go-demo-7 \
    describe canary go-demo-7

kubectl --namespace go-demo-7 \
    describe virtualservice go-demo-7

kubectl --namespace go-demo-7 \
    get canaries

# Go to the second terminal session and stop the loop with *ctrl+c*

#######################
# Visualizing Metrics #
#######################

# Go to the first terminal session

istioctl manifest apply \
    --set values.grafana.enabled=true

kubectl --namespace istio-system \
    port-forward $(kubectl \
    --namespace istio-system \
    get pod \
    --selector app=grafana \
    --output jsonpath='{.items[0].metadata.name}') \
    3000:3000 &

cat k8s/grafana/flagger.json

# Copy the JSON

open "http://localhost:3000/dashboard/import"

# Paste the JSON

##############
# References #
##############

# https://docs.flagger.app/

###############
# Cleaning Up #
###############

cd ..

killall kubectl

kubectl delete namespace go-demo-7

# Destroy the cluster (optional)