https://github.com/techprimers/k8s-spring-boot-example

Kubernetes Spring Boot Example commands
https://github.com/techprimers/k8s-spring-boot-example

gke google-kubernetes-engine kubernetes kubernetes-spring-boot

Last synced: 6 months ago
JSON representation

Kubernetes Spring Boot Example commands

• Host: GitHub
• URL: https://github.com/techprimers/k8s-spring-boot-example
• Owner: TechPrimers
• Created: 2019-04-28T11:31:33.000Z (over 6 years ago)
• Default Branch: master
• Last Pushed: 2019-05-29T16:07:37.000Z (over 6 years ago)
• Last Synced: 2025-03-28T19:13:13.829Z (7 months ago)
• Topics: gke, google-kubernetes-engine, kubernetes, kubernetes-spring-boot
• Size: 20.5 KB
• Stars: 73
• Watchers: 6
• Forks: 143
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

Awesome Lists containing this project

README

          
# Kubernetes Spring Boot Example in Google Kubernetes Engine (GKE)

Table of Contents

=================

   * [Kubernetes Spring Boot Example in Google Kubernetes Engine (GKE)](#kubernetes-spring-boot-example-in-google-kubernetes-engine-gke)

   * [Table of Contents](#table-of-contents)

      * [Create Spring Boot app](#create-spring-boot-app)

      * [Create Docker image](#create-docker-image)

      * [Run the Docker image](#run-the-docker-image)

      * [Login to the K8s Cluster](#login-to-the-k8s-cluster)

      * [Kubernetes Commands](#kubernetes-commands)

         * [List Pods](#list-pods)

         * [List Deployments](#list-deployments)

         * [List Services](#list-services)

         * [Deploy an image](#deploy-an-image)

         * [Expose Load Balancer](#expose-load-balancer)

         * [Scale deployments](#scale-deployments)

      * [K8s YAML Creator](#k8s-yaml-creator)

         * [Deployment YML used](#deployment-yml-used)

         * [Service YML used](#service-yml-used)

         * [Commands to Create/Update](#commands-to-createupdate)

         * [Command to retrieve logs](#command-to-retrieve-logs)

      * [Deployment Strategies](#deployment-strategies)

         * [Recreate Strategy](#recreate-strategy)

         * [Rolling Update Strategy](#rolling-update-strategy)

         * [Blue Green Deployment](#blue-green-deployment)

            * [Commands](#commands)

      * [Canary Deployments](#canary-deployments)

         * [Type 1](#type-1)

            * [Commands](#commands-1)

         * [Type 2](#type-2)

            * [Commands](#commands-2)

         

## Create Spring Boot app

You can use the sample project which I have in here.

`git clone https://github.com/TechPrimers/spring-boot-lazy-init-example.git`

## Create Docker image

Command to create docker image using Google JIB plugin

`./mvnw com.google.cloud.tools:jib-maven-plugin:build -Dimage=gcr.io/$GOOGLE_CLOUD_PROJECT/spring-boot-example:v1`

## Run the Docker image

Command to run the docker image which we created in the previous step

`docker run -ti --rm -p 8080:8080 gcr.io/$GOOGLE_CLOUD_PROJECT/spring-boot-example:v1`

## Login to the K8s Cluster

Command to login to the K8s cluster from Cloud Shell

`gcloud container clusters get-credentials techprimer-cluster-1 --zone  us-central1-a`

## Kubernetes Commands

### List Pods

`kubectl get pods`

### List Deployments

`kubectl get deployments`

### List Services

`kubectl get services`

### Deploy an image

`kubectl run spring-boot-example --image=gcr.io/$GOOGLE_CLOUD_PROJECT/spring-boot-example:v1 --port=8080`

### Expose Load Balancer

`kubectl expose deployment spring-boot-example --type=LoadBalancer`

### Scale deployments

`kubectl scale deployment spring-boot-example --replicas=3`

## K8s YAML Creator

Link to Brandon Potter's YML builder - [https://static.brandonpotter.com/kubernetes/DeploymentBuilder.html](https://static.brandonpotter.com/kubernetes/DeploymentBuilder.html)

### Deployment YML used

```

apiVersion: extensions/v1beta1

kind: Deployment

metadata:

  name: spring-boot-example

spec:

  replicas: 3

  template:

    metadata:

      labels:

        app: spring-boot-example

    spec:

      containers:

        - name: spring-boot-example

          image: 'gcr.io/fleet-resolver-237016/spring-boot-example:v1'

          ports:

            - containerPort: 8080

```

### Service YML used

```

apiVersion: v1

kind: Service

metadata:

  name: spring-boot-example

  labels:

    name: spring-boot-example

spec:

  ports:

    - port: 8080

      targetPort: 8080

      protocol: TCP

  selector:

    app: spring-boot-example

  type: LoadBalancer

```

### Commands to Create/Update

- `kubectl apply -f deployment.yml`

- `kubectl apply -f service.yml`

### Command to retrieve logs

`kubectl logs `

- Pod Name can be retrived using `kubectl get pods`

## Deployment Strategies

- Recreate

- RollingUpdate

- Blue/Green

- Canary

### Recreate Strategy

kube.yml

```

apiVersion: extensions/v1beta1

kind: Deployment

metadata:

  name: spring-boot-example

spec:

  replicas: 3

  strategy:

    type: Recreate

  template:

    metadata:

      labels:

        app: spring-boot-example

    spec:

      containers:

        - name: spring-boot-example

          image: 'gcr.io/fleet-resolver-237016/spring-boot-example:v1'

          ports:

            - containerPort: 8080

---

apiVersion: v1

kind: Service

metadata:

  name: spring-boot-example

  labels:

    name: spring-boot-example

spec:

  ports:

    - port: 8080

      targetPort: 8080

      protocol: TCP

  selector:

    app: spring-boot-example

  type: LoadBalancer

```

### Rolling Update Strategy

kube.yml

```

apiVersion: extensions/v1beta1

kind: Deployment

metadata:

  name: spring-boot-example

spec:

  replicas: 3

  strategy:

    type: RollingUpdate

    rollingUpdate:

      maxUnavailable: 0

      maxSurge: 1

  template:

    metadata:

      labels:

        app: spring-boot-example

    spec:

      containers:

        - name: spring-boot-example

          image: 'gcr.io/fleet-resolver-237016/spring-boot-example:v1'

          ports:

            - containerPort: 8080

          readinessProbe:

            httpGet:

              path: /lazy

              port: 8080

            initialDelaySeconds: 5

            periodSeconds: 5

---

apiVersion: v1

kind: Service

metadata:

  name: spring-boot-example

  labels:

    name: spring-boot-example

spec:

  ports:

    - port: 8080

      targetPort: 8080

      protocol: TCP

  selector:

    app: spring-boot-example

  type: LoadBalancer

```

### Blue Green Deployment

- deployment-blue-v1.yml

```

apiVersion: extensions/v1beta1

kind: Deployment

metadata:

  name: spring-boot-example-v1

spec:

  replicas: 3

  strategy:

    type: RollingUpdate

    rollingUpdate:

      maxUnavailable: 0

      maxSurge: 1

  template:

    metadata:

      labels:

        app: spring-boot-example

        version: "v1"

    spec:

      containers:

        - name: spring-boot-example

          image: 'gcr.io/fleet-resolver-237016/spring-boot-example:v1'

          ports:

            - containerPort: 8080

          readinessProbe:

            httpGet:

              path: /lazy

              port: 8080

            initialDelaySeconds: 5

            periodSeconds: 5

```

- service-blue-v1.yml

```

apiVersion: v1

kind: Service

metadata:

  name: spring-boot-example

  labels:

    name: spring-boot-example

    version: "v1"

spec:

  ports:

    - port: 8080

      targetPort: 8080

      protocol: TCP

  selector:

    app: spring-boot-example

    version: "v1"

  type: LoadBalancer

```

- deployment-green-v2.yml

```

apiVersion: extensions/v1beta1

kind: Deployment

metadata:

  name: spring-boot-example-v2

spec:

  replicas: 3

  strategy:

    type: RollingUpdate

    rollingUpdate:

      maxUnavailable: 0

      maxSurge: 1

  template:

    metadata:

      labels:

        app: spring-boot-example

        version: "v2"

    spec:

      containers:

        - name: spring-boot-example

          image: 'gcr.io/fleet-resolver-237016/spring-boot-example:v2'

          ports:

            - containerPort: 8080

          readinessProbe:

            httpGet:

              path: /lazy

              port: 8080

            initialDelaySeconds: 5

            periodSeconds: 5

```

- service-green-v2.yml

```

apiVersion: v1

kind: Service

metadata:

  name: spring-boot-example-green

  labels:

    name: spring-boot-example-green

    version: "v2"

spec:

  ports:

    - port: 8080

      targetPort: 8080

      protocol: TCP

  selector:

    app: spring-boot-example

    version: "v2"

  type: LoadBalancer

```

- deployment-blue-v2.yml

```

apiVersion: extensions/v1beta1

kind: Deployment

metadata:

  name: spring-boot-example-v2

spec:

  replicas: 3

  strategy:

    type: RollingUpdate

    rollingUpdate:

      maxUnavailable: 0

      maxSurge: 1

  template:

    metadata:

      labels:

        app: spring-boot-example

        version: "v2"

    spec:

      containers:

        - name: spring-boot-example

          image: 'gcr.io/fleet-resolver-237016/spring-boot-example:v2'

          ports:

            - containerPort: 8080

          readinessProbe:

            httpGet:

              path: /lazy

              port: 8080

            initialDelaySeconds: 5

            periodSeconds: 5

```

- service-blue-v2.yml

```

apiVersion: v1

kind: Service

metadata:

  name: spring-boot-example

  labels:

    name: spring-boot-example

    version: "v2"

spec:

  ports:

    - port: 8080

      targetPort: 8080

      protocol: TCP

  selector:

    app: spring-boot-example

    version: "v2"

  type: LoadBalancer

```

#### Commands

- `kubectl apply -f deployment-blue-v1.yml`

- `kubectl apply -f service-blue-v1.yml`

- `kubectl apply -f deployment-green-v2.yml`

- `kubectl apply -f service-green-v2.yml`

- `kubectl apply -f deployment-blue-v2.yml`

- `kubectl apply -f service-blue-v2.yml`

- `kubectl delete deployment.apps/spring-boot-example-v1 service/spring-boot-example-green`

## Canary Deployments

### Type 1 

Using Tags in Kubernetes

- kube-v1.yml

```

apiVersion: extensions/v1beta1

kind: Deployment

metadata:

  name: spring-boot-example-v1

spec:

  replicas: 3

  strategy:

    type: RollingUpdate

    rollingUpdate:

      maxUnavailable: 0

      maxSurge: 1

  template:

    metadata:

      labels:

        app: spring-boot-example

        version: "v1"

    spec:

      containers:

        - name: spring-boot-example

          image: 'gcr.io/fleet-resolver-237016/spring-boot-example:v1'

          ports:

            - containerPort: 8080

          readinessProbe:

            httpGet:

              path: /lazy

              port: 8080

            initialDelaySeconds: 5

            periodSeconds: 5

---

apiVersion: v1

kind: Service

metadata:

  name: spring-boot-example

  labels:

    name: spring-boot-example

    version: "v1"

spec:

  ports:

    - port: 8080

      targetPort: 8080

      protocol: TCP

  selector:

    app: spring-boot-example

    version: "v1"

  type: LoadBalancer

```

- deployment-v2.yml

```

apiVersion: extensions/v1beta1

kind: Deployment

metadata:

  name: spring-boot-example-v2

spec:

  replicas: 3

  strategy:

    type: RollingUpdate

    rollingUpdate:

      maxUnavailable: 0

      maxSurge: 1

  template:

    metadata:

      labels:

        app: spring-boot-example

        version: "v2"

    spec:

      containers:

        - name: spring-boot-example

          image: 'gcr.io/fleet-resolver-237016/spring-boot-example:v2'

          ports:

            - containerPort: 8080

          readinessProbe:

            httpGet:

              path: /lazy

              port: 8080

            initialDelaySeconds: 5

            periodSeconds: 5

```

- Update Service to remove "version" tag.

service-v1.yml

```

apiVersion: v1

kind: Service

metadata:

  name: spring-boot-example

  labels:

    name: spring-boot-example

spec:

  ports:

    - port: 8080

      targetPort: 8080

      protocol: TCP

  selector:

    app: spring-boot-example

  type: LoadBalancer

```

- add "v2" for version in the Service object

service-v2.yml

```

apiVersion: v1

kind: Service

metadata:

  name: spring-boot-example

  labels:

    name: spring-boot-example

    version: "v2"

spec:

  ports:

    - port: 8080

      targetPort: 8080

      protocol: TCP

  selector:

    app: spring-boot-example

    version: "v2"

  type: LoadBalancer

```

#### Commands

- `kubectl apply -f kube-v1.yml`

- `kubectl apply -f deployment-v2.yml`

- `kubectl apply -f service-v1.yml

- `kubectl apply -f service-v2.yml

### Type 2

- Create V3 version along with Service object

kube-v3.yml

```

apiVersion: extensions/v1beta1

kind: Deployment

metadata:

  name: spring-boot-example-v3

spec:

  replicas: 3

  strategy:

    type: RollingUpdate

    rollingUpdate:

      maxUnavailable: 0

      maxSurge: 1

  template:

    metadata:

      labels:

        app: spring-boot-example

        version: "v1"

    spec:

      containers:

        - name: spring-boot-example

          image: 'gcr.io/fleet-resolver-237016/spring-boot-example:v3'

          ports:

            - containerPort: 8080

          readinessProbe:

            httpGet:

              path: /v3/lazy

              port: 8080

            initialDelaySeconds: 5

            periodSeconds: 5

---

apiVersion: v1

kind: Service

metadata:

  name: spring-boot-example-v3

  labels:

    name: spring-boot-example

    version: "v3"

spec:

  ports:

    - port: 8080

      targetPort: 8080

      protocol: TCP

  selector:

    app: spring-boot-example

    version: "v3"

  type: LoadBalancer

```

- Ingress config

ingress.yml

```

kind: Ingress

apiVersion: extensions/v1beta1

metadata:

  name: sb-ingress

spec:

  rules:

  - http:

      paths:

      - path: /lazy/*

        backend:

          serviceName: spring-boot-example

          servicePort: 8080

      - path: /v3/lazy

        backend:

          serviceName: spring-boot-example-v3

          servicePort: 8080

```

- Remove and make default backend rule in ingress

ingress-default.yml

```

kind: Ingress

apiVersion: extensions/v1beta1

metadata:

  name: sb-ingress

spec:

  backend:

    serviceName: spring-boot-example-v3

    servicePort: 8080

```

#### Commands

- `kubectl apply -f kube-v3.yml`

- `kubectl apply -f ingress.yml`

- `kubectl apply -f ingress-default.yml`