This project is a sample for running the web application on Kubernetes. The web application consists of three layers: Web, App, DB.
For more information about this application, see:
- Web
- App
The previous source(used Spring Boot) can be found on this branch.
This sample deployed three layers to three services : webserver-k8s-service, appserver-k8s-service, dbserver-k8s-service. There are three pods in the each service, but DB service is only one. Different middleware and applications are deployed on each pod. Web pods run a Vue.js application on Nginx, App pods run a golang web application. The DB pod uses PostgreSQL.
The following requirements for running are required:
- CentOS 7
- Docker
- Kind (Kubernetes In Docker)
Perform the following steps:
- Install Docker.
## install dependency packages sudo yum install -y yum-utils device-mapper-persistent-data lvm2 ## add repository. sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo ## update package information sudo yum makecache fast ## install docker sudo yum install docker-ce ## add my account to the docker group sudo groupadd docker sudo usermod -aG docker $USER
- Install kubectl.
## add repository cat <<EOF > /etc/yum.repos.d/kubernetes.repo [kubernetes] name=Kubernetes baseurl=https://packages.cloud.google.com/yum/repos/kubernetes-el7-x86_64 enabled=1 gpgcheck=1 repo_gpgcheck=1 gpgkey=https://packages.cloud.google.com/yum/doc/yum-key.gpg https://packages.cloud.google.com/yum/doc/rpm-package-key.gpg EOF ## install kubectl yum install -y kubectl
- Install kind.
## download kind's binary files curl -Lo ./kind https://kind.sigs.k8s.io/dl/v0.8.1/kind-linux-amd64 ## change authority chmod +x ./kind ## move kind's binary files mv ./kind /usr/local/bin/kind
Perform the following steps:
- Create a cluster.
- Build Dockerfiles and upload docker images to kind.
- Enable Ingress. Deploy ingress-nigix-controller.
- Enable Dashboard(optional).
- Create deployments and services.
- Access Ingress's URL in your browser and confirm that this application has started.
## create a cluster
kind create cluster --config k8s-cluster.yml
## check a cluster information
kubectl cluster-info
## check kube-system's pods
kubectl get pods --all-namespaces## build dockerfiles
docker build -t appserver_k8s:1.3 -f k8s/app/Dockerfile .
docker build -t dbserver_k8s:1.0 -f k8s/db/Dockerfile .
docker build -t webserver_k8s:1.0 -f k8s/web/Dockerfile .
## upload docker images to kind
kind load docker-image appserver_k8s:1.3
kind load docker-image dbserver_k8s:1.0
kind load docker-image webserver_k8s:1.0Ingress controller doesn't deploy in the local kubernetes as a default, so we have to deploy it by oneself. In this here, we will deploy Ingress nginx controller.
## deploy ingress controller
kubectl apply -f k8s/ext/ingress/deploy.yaml
## check that the setup of ingress have finished in the following command
kubectl wait --namespace ingress-nginx --for=condition=ready pod --selector=app.kubernetes.io/component=controller --timeout=90sWe will deploy the dashboard for kubernetes so that it is easy to check the status of the pods.
## create pods and services for dashbord
kubectl apply -f k8s/ext/dashboard/recommended.yaml
## create a account for dashboard
kubectl apply -f k8s/ext/dashboard/account.yaml
## get a authentication token for login
kubectl -n kubernetes-dashboard describe secret $(kubectl -n kubernetes-dashboard get secret | grep admin-user | awk '{print $1}')
## start proxy of kubernetes
kubectl proxy
## access the following URL in Chrome and then login## deploy redis
kubectl apply -f k8s/redis/deployment.yaml
kubectl apply -f k8s/redis/service.yaml
## deploy db
kubectl apply -f k8s/db/statefulset.yaml
kubectl apply -f k8s/db/service.yaml
## deploy application
kubectl apply -f k8s/app/deployment.yaml
kubectl apply -f k8s/app/service.yaml
## deploy web
kubectl apply -f k8s/web/deployment.yaml
kubectl apply -f k8s/web/service.yaml
## check deployed pods
kubectl get pods
## check deployed services
kubectl get services
## check all services and pods
kubectl get all
## access the following URL in Chrome and then login- URL: http://localhost/
- User Name:
test - Password:
test
## for db
kubectl exec -it dbserver-k8s-sfs-0 --container dbserver -- psql -U testusr testdb
## for application
kubectl exec -it appserver-k8s-67dbd4f8b8-z5f6v --container appserver -- /bin/bash
## for web
kubectl exec -it webserver-k8s-54b64f8dc-gdn8l --container nginx -- /bin/bash
## for redis
kubectl exec -it redis-k8s-75d7484844-hxs94 --container redis -- redis-cli- Delete deployments and services.
- Delete a cluster.
# delete all services and pods
kubectl delete all --all
# or perform the following commands
# delete the pods and the service for redis
kubectl delete -f k8s/redis/deployment.yaml
kubectl delete -f k8s/redis/service.yaml
# delete the pods and the service for db
kubectl delete -f k8s/db/statefulset.yaml
kubectl delete -f k8s/db/service.yaml
# delete the pods and the service for application
kubectl delete -f k8s/app/deployment.yaml
kubectl delete -f k8s/app/service.yaml
# delete the pods and the service for web
kubectl delete -f k8s/web/deployment.yaml
kubectl delete -f k8s/web/service.yaml# display summary for any pod
kubectl describe pods [pod name]
# display summary for any service
kubectl describe services [service name]
# check log of any pod
kubectl logs [pod name]The follwing figure is the map of this sample project.
- k8s ... Define yml for Kubernetes.
- ext ... Define the extension functions for Kubernetes.
- app ... Define deployments for application service.
- db ... Define deployments for database service.
- lb ... Define deployments for ingress.
- redis ... Define deployments for redis.
- web ... Define deployments for web service.
The License of this sample is MIT License.
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