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Add simple Kubernetes example
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- [Nginx simple reverse proxy example](./nginx-simple)
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- [Nginx reverse proxy example with defined location directive (different context path)](./nginx-contextpath)
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- [Kubernetes simple deployment](./kubernetes-simple)
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51
examples/kubernetes-simple/README.md
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examples/kubernetes-simple/README.md
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# PlantUML Kubernetes Deployment
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In this example, PlantUML is deployed on an Kubernetes cluster using a `Deployment`, a `Service` and an `Ingress`.
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## Quick start
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Install:
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```bash
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# Hint: Adjust the Ingress host to your URL
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kubectl create ns plantuml
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kubectl -n plantuml apply -f deployment.yaml
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```
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Uninstall:
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```bash
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kubectl -n plantuml delete -f deployment.yaml
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kubectl delete ns plantuml
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```
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## TLS configuration
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Create a TLS `Secret` and extend the `Ingress` spec with a TLS configuration:
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```bash
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[...]
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tls:
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- hosts:
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- plantuml-example.localhost
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secretName: plantuml-tls
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```
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Since the `Ingress Controller` terminates the TLS and routes `http` to the application, we might need to tell the application explicitly that it got a forwarded request.
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This configuration changes depending on the `Ingress Controller`. Here an nginx example:
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```
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annotations:
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kubernetes.io/ingress.class: nginx
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nginx.ingress.kubernetes.io/configuration-snippet: |
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more_set_headers "X-Forwarded-Proto: https";
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```
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## Useful commands
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```bash
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# see whats going on inside your Deployment
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kubectl -n plantuml logs -l "app.kubernetes.io/name=plantuml"
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```
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examples/kubernetes-simple/deployment.yaml
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examples/kubernetes-simple/deployment.yaml
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---
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apiVersion: apps/v1
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kind: Deployment
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metadata:
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name: plantuml
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labels:
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app.kubernetes.io/name: plantuml
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app.kubernetes.io/instance: plantuml
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spec:
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replicas: 3 # Can be adjusted
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selector:
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matchLabels:
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app.kubernetes.io/name: plantuml
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app.kubernetes.io/instance: plantuml
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template:
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metadata:
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labels:
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app.kubernetes.io/name: plantuml
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app.kubernetes.io/instance: plantuml
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spec:
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containers:
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- name: plantuml
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securityContext:
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allowPrivilegeEscalation: false
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image: plantuml/plantuml-server:jetty-v1.2022.6
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imagePullPolicy: Always
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# env: # In case of different base URL
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# - name: BASE_URL
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# value: plantuml
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ports:
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- name: http
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containerPort: 8080
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protocol: TCP
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livenessProbe:
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tcpSocket:
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port: http
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readinessProbe:
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tcpSocket:
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port: http
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resources:
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limits:
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cpu: 500m
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memory: 2048Mi
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requests:
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cpu: 250m
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memory: 1024Mi
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---
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apiVersion: v1
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kind: Service
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metadata:
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name: plantuml
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labels:
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app.kubernetes.io/name: plantuml
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app.kubernetes.io/instance: plantuml
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spec:
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type: ClusterIP
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ports:
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- port: 80
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targetPort: http
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protocol: TCP
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name: http
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selector:
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app.kubernetes.io/name: plantuml
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app.kubernetes.io/instance: plantuml
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---
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apiVersion: networking.k8s.io/v1
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kind: Ingress
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metadata:
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name: plantuml
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labels:
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app.kubernetes.io/name: plantuml
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app.kubernetes.io/instance: plantuml
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spec:
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rules:
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- host: plantuml-example.localhost
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http:
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paths:
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- backend:
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service:
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name: plantuml
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port:
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number: 80
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path: /
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pathType: Prefix
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