docker_app/k8s/adminer/adminer-service-outside.yml

kind: Ingress
apiVersion: networking.k8s.io/v1
metadata:
  name: adminer
spec:
  ingressClassName: nginx
  rules:
    - host: adminer.xyz.cn
      http:
        paths:
          - path: /
            pathType: ImplementationSpecific
            backend:
              service:
                name: adminer
                port:
                  number: 9000