OpenShift 4之Route与Ingress

在OpenShift 4中通过Ingress Operator（名为ingress的clusteroperator）供应了Kubernetes的Ingress Controller对象（缺省名为default的ingresscontroller）并维护其生命周期，如果该default的ingresscontroller被删掉，Ingress Operator会自动重建新的ingresscontroller实例对象。OpenShift的Ingress Operator可以供应一个或多个基于HAProxy的Ingress Controller来实现外部入栈请求的流量路由。

Kubernetes缺省的Igress和OpenShift实现的Route功能区别如下：

查看缺省名为ingress的clusteroperator

$ oc get clusteroperators ingress
NAME      VERSION   AVAILABLE   PROGRESSING   DEGRADED   SINCE
ingress   4.2.8     True        False         False      21d

查看缺省名为default的ingresscontroller

$ oc get ingresscontroller -n openshift-ingress-operator
NAME      AGE
default   21d
$ oc describe ingresscontroller/default -n openshift-ingress-operator
Name:         default
Namespace:    openshift-ingress-operator
Labels:       <none>
Annotations:  <none>
API Version:  operator.openshift.io/v1
Kind:         IngressController
Metadata:
  Finalizers:
    ingresscontroller.operator.openshift.io/finalizer-ingresscontroller
  Generation:        2
  Resource Version:  24859
Spec:
  Replicas:  1
Status:
  Available Replicas:  1
  Domain:                  apps-crc.testing
  Endpoint Publishing Strategy:
    Type:    HostNetwork
  Selector:  ingresscontroller.operator.openshift.io/deployment-ingresscontroller=default

扩展default的ingresscontroller实例数

$ oc patch ingresscontroller/default --patch '{"spec":{"replicas": 3}}' --type=merge -n openshift-ingress-operator
ingresscontroller.operator.openshift.io/default patched

查看Ingress Operator的日志

$ oc logs deployments/ingress-operator -n openshift-ingress-operator

查看运行route的项目

其中Pod中运行了基于HA-Proxy的Route功能。

$ oc get all -n openshift-ingress
NAME                                  READY   STATUS    RESTARTS   AGE
pod/router-default-746d57f6d8-p7fct   1/1     Running   2          21d

NAME                              TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)                   AGE
service/router-internal-default   ClusterIP   172.30.145.3   <none>        80/TCP,443/TCP,1936/TCP   21d

NAME                             READY   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/router-default   1/1     1            1           21d

NAME                                        DESIRED   CURRENT   READY   AGE
replicaset.apps/router-default-746d57f6d8   1         1         1       21d