Нужно развернуть Nexus Repository 3 внутри кластера Kubernetes.
В кластере настроен LoadBalancer и CertManager.
Образ Docker есть на hub.docker.com.

kubectl create ns nexus

Для работы Nexus нужна директория. где он будет хранить артефакты. Для этого создаим StorageClass, PersistentVolumeСlaim и сам PersistentVolume:

apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: nexus-storage-class
  namespace: nexus
provisioner: kubernetes.io/no-provisioner
reclaimPolicy: Retain
volumeBindingMode: WaitForFirstConsumer
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: nexus-data-pv-claim
  namespace: nexus
spec:
  storageClassName: nexus-storage-class
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 20Gi
  selector:
    matchLabels:
      app: nexus-server
---
apiVersion: v1
kind: PersistentVolume
metadata:
   name: nexus-data-pv
   namespace: nexus
   labels:
     app: nexus-server
spec:
  capacity:
    storage: 20Gi
  accessModes:
  - ReadWriteOnce
  storageClassName: nexus-storage-class
  hostPath:
    path: "/kubernetes_volumes/nexus-data"
    type: Directory
  persistentVolumeReclaimPolicy: Retain

apiVersion: apps/v1
kind: Deployment
metadata:    
  name: nexus
  namespace: nexus
spec:
  replicas: 1
  selector:  
    matchLabels:
      app: nexus-server
  template:  
    metadata:
      labels:
        app: nexus-server
    spec:
      containers:    
        - name: nexus
          image: sonatype/nexus3:latest
          resources:
            limits:
              memory: "4Gi"
              cpu: "1000m"
            requests:
              memory: "1Gi"
              cpu: "500m"
          ports:
            - containerPort: 8081
          volumeMounts:
            - name: nexus-data
              mountPath: /nexus-data
      volumes:
      - name: nexus-data
        persistentVolumeClaim:
          claimName: nexus-data-pv-claim

apiVersion: v1
kind: Service
metadata:
  name: nexus-svc
  namespace: nexus
  annotations:
      prometheus.io/scrape: 'true'
      prometheus.io/path:   /
      prometheus.io/port:   '8081'
spec:
  selector: 
    app: nexus-server
  type: ClusterIP
  ports:
  - name: http
    port: 80
    protocol: TCP
    targetPort: 8081
  - name: docker-registry
    port: 5000
    protocol: TCP
    targetPort: 5000
---
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  annotations:
    kubernetes.io/ingress.class: nginx
    cert-manager.io/cluster-issuer: letsencrypt
    nginx.ingress.kubernetes.io/proxy-body-size: "0"
    nginx.ingress.kubernetes.io/proxy-read-timeout: "3600"
    nginx.ingress.kubernetes.io/proxy-send-timeout: "3600"
    nginx.ingress.kubernetes.io/client-max-body-size: "4096m"
  name: nexus-ingress
  namespace: nexus
spec:
  rules:
  - host: nexus.domain.com
    http:
      paths:
      - backend:
          serviceName: nexus-svc
          servicePort: 80
        path: /
  tls:
  - hosts:
    - nexus.domain.com
    secretName:  nexus-domain-com-tls
---
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  annotations:
    kubernetes.io/ingress.class: nginx
    cert-manager.io/cluster-issuer: letsencrypt
    nginx.ingress.kubernetes.io/proxy-body-size: "0"
    nginx.ingress.kubernetes.io/proxy-read-timeout: "3600"
    nginx.ingress.kubernetes.io/proxy-send-timeout: "3600"
    nginx.ingress.kubernetes.io/client-max-body-size: "4096m"
  name: nexus-docker-ingress
  namespace: nexus
spec:
  rules:
  - host: registry.autosys.tk
    http:
      paths:
      - backend:
          serviceName: nexus-svc
          servicePort: 5000
        path: /
  tls:
  - hosts:
    - registry.autosys.tk
    secretName:  registry-autosys-tk-tls

Администативная учетка - admin.
Пароль по-умолчанию от учетки admin генерируется во время deplyment'а и хранится в корневой папке PersistentVolume - в файле admin.password.