148-dapr.sh

# Source: https://gist.github.com/8d941690a087b0de0e2731a52cfb1f51

###############################################################
# Building Event-Driven Microservices In Kubernetes With Dapr #
# https://youtu.be/-4sHUvfk2Eg                                #
###############################################################

# Additional Info:
# - https://dapr.io
# - What is microservices architecture?: https://youtu.be/F-37_gV2tMs
# - How Microservices Communicate? Sync vs Async. Direct vs Brokers And Event Busses: https://youtu.be/6XTGcgt5clQ

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

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

cd dapr-demo

# Create a Kubernetes cluster
# The demo was tested using GKE, but any other Kubernetes cluster should do.
# If you're using a local Kubernetes cluster, please change the `Service` in `apps.yaml` to be `type: NodePort`

kubectl create namespace production

helm repo add dapr \
    https://dapr.github.io/helm-charts

helm repo update

helm upgrade --install \
    dapr dapr/dapr \
    --namespace dapr-system \
    --create-namespace \
    --wait

helm repo add bitnami \
    https://charts.bitnami.com/bitnami

helm repo update

helm upgrade --install \
    redis bitnami/redis \
    --namespace production \
    --create-namespace \
    --wait

kubectl --namespace production apply \
    --filename redis-dapr.yaml

##################################
# Deploying (Real) Microservices #
##################################

cat apps.yaml

kubectl --namespace production apply \
    --filename apps.yaml

kubectl --namespace production \
    rollout status \
    deployment speech-to-text

kubectl --namespace production \
    rollout status \
    deployment tweet

kubectl --namespace production \
    rollout status \
    deployment publications

# The command that follows might differ in EKS and local Kubernetes clusters.
# In EKS, you'll need get retrieve the `hostname` instead of the `ip`.
# Local Kubernetes clusters should be accessible through `127.0.0.1`.
export LB_IP=$(kubectl \
    --namespace production \
    get svc publications \
    --output jsonpath="{.status.loadBalancer.ingress[0].ip}")

curl "http://$LB_IP/addVideo?id=JFALdhtBxR8&name=Rancher&url=https://youtu.be/JFALdhtBxR8"

curl "http://$LB_IP/addPodcast?id=143&name=CI/CD&url=https://www.devopsparadox.com/episodes/how-to-get-started-with-ci-cd-143"

curl "http://$LB_IP/addBlog?name=Rancher&url=https://technologyconversations.com/2022/01/24/how-to-manage-production-grade-kubernetes-clusters-with-rancher"

kubectl --namespace production logs \
    --selector app=tweet \
    --container tweet \
    --tail 20

kubectl --namespace production logs \
    --selector app=speech-to-text \
    --container speech-to-text \
    --tail 20

################################################################
# Microservices Communication With Pub/Sub Events Through Dapr #
################################################################

cat redis-dapr.yaml

cat apps.yaml

cat publications/main.go

cat speech-to-text/main.go

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

# Destroy or reset the demo cluster