/kubernetes-examples

A study kubernetes project

Primary LanguageKotlin

How to run in Kubernetes

  1. minikube start --driver='virtualbox' --memory 8192 --cpus 2 --extra-config=kubelet.max-pods=100
  2. minikube addons enable metrics-server
  3. minikube addons enable ingress
  4. eval $(minikube -p minikube docker-env)
  5. docker build -t mykube .
  6. kubectl apply -f kubernetes.yml

How to run in Kubernetes

  1. kind create cluster --config kind/kind-cluster-config.yaml
  2. kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/main/deploy/static/provider/kind/deploy.yaml
  3. docker build -t mykube:v1 .
  4. kind load docker-image mykube:v1
  5. kubectl apply -f kubernetes.yml

Install Prometheus

kubectl create namespace prometheus
helm repo add prometheus-community https://prometheus-community.github.io/helm-charts
helm install prometheus prometheus-community/kube-prometheus-stack --namespace prometheus
kubectl get pods -n prometheus
kubectl port-forward -n prometheus prometheus-prometheus-kube-prometheus-prometheus-0 9090
kubectl port-forward -n prometheus prometheus-grafana-74b9c448f6-qcptr 3000

Reference

Kafka Configuration (Using Docker)

First of all download (Confluent Community Tools)[curl -O http://packages.confluent.io/archive/7.0/confluent-community-7.0.0.tar.gz]

docker-compose -f docker-compose-kafka.yml up

Create a Topic

$CONFLUENT_BIN_PATH/kafka-topics --create --if-not-exists --bootstrap-server "localhost:9092" --topic "mytopic"

Send a Message

Connect to the topic

$CONFLUENT_BIN_PATH/kafka-console-producer --broker-list "localhost:9092" --topic "mytopic"

Send some message

My first message{ENTER}

Close connection

{CTRL+C}

Receiving Messages

$CONFLUENT_BIN_PATH/kafka-console-consumer --bootstrap-server "localhost:9092" --from-beginning --topic "mytopic" --group "my-consumer-group"

Problems

vboxnet0 is down

sudo ip link set vboxnet0 up
sudo ip address add 192.168.99.1/24 dev vboxnet0