YAML file to install Jenkins

jenkins.yml

apiVersion: v1
kind: Namespace
metadata:
  name: jenkins

---

apiVersion: v1
kind: Namespace
metadata:
  name: build

---

apiVersion: v1
kind: ServiceAccount
metadata:
  name: jenkins
  namespace: jenkins

---
  
kind: Role
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: jenkins
  namespace: build
rules:
- apiGroups: [""]
  resources: ["pods"]
  verbs: ["create","delete","get","list","patch","update","watch"]
- apiGroups: [""]
  resources: ["pods/exec"]
  verbs: ["create","delete","get","list","patch","update","watch"]
- apiGroups: [""]
  resources: ["pods/log"]
  verbs: ["get","list","watch"]
- apiGroups: [""]
  resources: ["events"]
  verbs: ["watch"]
- apiGroups: [""]
  resources: ["secrets"]
  verbs: ["get"]

---

apiVersion: rbac.authorization.k8s.io/v1beta1
kind: RoleBinding
metadata:
  name: jenkins
  namespace: build
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: Role
  name: jenkins
subjects:
- kind: ServiceAccount
  name: jenkins
  namespace: jenkins

---

apiVersion: v1
kind: Service
metadata:
  name: jenkins
  namespace: jenkins
spec:
  selector:
    app: jenkins
  ports:
  - name: http
    port: 8080
    targetPort: 8080
    protocol: TCP
  - name: agent
    port: 50000
    protocol: TCP

---

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: jenkins
  namespace: jenkins
  annotations:
    kubernetes.io/ingress.class: "nginx"
    ingress.kubernetes.io/ssl-redirect: "false"
    ingress.kubernetes.io/proxy-body-size: 50m
    ingress.kubernetes.io/proxy-request-buffering: "off"
    nginx.ingress.kubernetes.io/ssl-redirect: "false"
    nginx.ingress.kubernetes.io/proxy-body-size: 50m
    nginx.ingress.kubernetes.io/proxy-request-buffering: "off"
spec:
  rules:
  - http:
      paths:
      - path: /jenkins
        backend:
          serviceName: jenkins
          servicePort: 8080

---

apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: jenkins
  namespace: jenkins
spec:
  selector:
    matchLabels:
      app: jenkins
  serviceName: jenkins
  replicas: 1
  updateStrategy:
    type: RollingUpdate
  template:
    metadata:
      labels:
        app: jenkins
    spec:
      terminationGracePeriodSeconds: 10
      serviceAccountName: jenkins
      containers:
      - name: jenkins
        image: jenkins/jenkins:lts-alpine
        imagePullPolicy: Always
        ports:
        - containerPort: 8080
        - containerPort: 50000
        resources:
          limits:
            cpu: 1
            memory: 1Gi
          requests:
            cpu: 0.5
            memory: 500Mi
        env:
        - name: JENKINS_OPTS
          value: --prefix=/jenkins
        - name: LIMITS_MEMORY
          valueFrom:
            resourceFieldRef:
              resource: limits.memory
              divisor: 1Mi
        - name: JAVA_OPTS
          value: -Xmx$(LIMITS_MEMORY)m -XshowSettings:vm -Dhudson.slaves.NodeProvisioner.initialDelay=0 -Dhudson.slaves.NodeProvisioner.MARGIN=50 -Dhudson.slaves.NodeProvisioner.MARGIN0=0.85
        volumeMounts:
        - name: jenkins-home
          mountPath: /var/jenkins_home
        livenessProbe:
          httpGet:
            path: /jenkins/login
            port: 8080
          initialDelaySeconds: 60
          timeoutSeconds: 5
          failureThreshold: 12 # ~2 minutes
        readinessProbe:
          httpGet:
            path: /jenkins/login
            port: 8080
          initialDelaySeconds: 60
          timeoutSeconds: 5
          failureThreshold: 12 # ~2 minutes
      securityContext:
        fsGroup: 1000
  volumeClaimTemplates:
  - metadata:
      name: jenkins-home
    spec:
      accessModes: [ "ReadWriteOnce" ]
      resources:
        requests:
          storage: 2Gi