Ingress

Load Balancers

Ingresses can be bound to load balancers. You can create a load balancer by using the API or the ELB console.

A load balancer can work on a private network or public network. If the load balancer has a public IP address, it can route requests over the public network.

Creating an Ingress

• Creating an HTTP ingress
  In the following example, the associated backend is nginx:8080. When http://10.10.10.10:6071/ is accessed, the traffic is forwarded to the Service corresponding to nginx:8080, and then to the corresponding pod.

  apiVersion: extensions/v1beta1                                   # Ingress version
  kind: Ingress
  metadata:
    name: nginx
    labels:
      app: nginx
      isExternal: "true"   # This parameter is mandatory and is reserved. The value must be true.
      zone: data         # Data plane mode. This parameter is reserved. The value must be data.
    annotations:
      kubernetes.io/elb.id: 2d48d034-6046-48db-8bb2-53c67e8148b5   # ID of the load balancer. This parameter is mandatory.
      kubernetes.io/elb.ip: 192.168.137.182                        # IP address of the load balancer. This parameter is optional.
      kubernetes.io/elb.port: '6071'                               # Port configured for the load balancer. This parameter is mandatory.
  spec:
    rules:                                                         # Routing rules
    - http:                                                        # Using HTTP protocol
        paths:
        - path: /                                                  # Route
          backend:
            serviceName: nginx                                     # Name of the Service to which requests are forwarded
            servicePort: 8080                                      # Port of the Service to which requests are forwarded

  You can also set the external domain name in an ingress so that you can access the load balancer through the domain name and then access backend Services.

  

  Domain name-based access depends on domain name resolution. You need to point the domain name to the IP address of the load balancer. For example, you can use Domain Name Service (DNS) to resolve domain names.

  spec:
    rules:
    - host: www.example.com       # Domain name
      http:
        paths:
        - path: /
          backend:
            serviceName: nginx
            servicePort: 80

• Creating an HTTPS ingress
  In the following example, the associated backend is nginx:8080. When https://10.10.10.10:6071/ is accessed, the traffic is forwarded to the Service corresponding to nginx:8080, and then to the corresponding pod.

  apiVersion: extensions/v1beta1
  kind: Ingress
  metadata:
    annotations:
      kubernetes.io/elb.id: 2d48d034-6046-48db-8bb2-53c67e8148b5
      kubernetes.io/elb.ip: 192.168.137.182
      kubernetes.io/elb.port: '6071'
    labels:
      app: nginx
      isExternal: 'true'
      zone: data
    name: nginx
  spec:
    rules:
    - http:
        paths:
        - backend:
            serviceName: nginx
            servicePort: 8080
          path: /
    tls:
   - secretName: cci-sslcertificate-20214221                                 # Name of the uploaded SSL certificate

Accessing Multiple Services

An ingress can access multiple Services at the same time. The configuration is as follows:

• When accessing http://foo.bar.com/foo, you access the backend s1:80.
• When accessing http://foo.bar.com/bar, you access the backend s2:80.

spec:
  rules:
  - host: foo.bar.com          # Host address
    http:
      paths:
      - path: "/foo"
        backend:
          serviceName: s1
          servicePort: 80
      - path: "/bar"
        backend:
          serviceName: s2
          servicePort: 80

Configuring the Routing Service for URL Redirection

cat <<-EOF | kubectl apply -f -
apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
  name: ingress-redirect-test
  namespace: default
 spec:
  rules:
  - host: ingress-test.com
    http:
      paths:
      - path: /
        backend:
          serviceName: service-test
          servicePort: 80
EOF