2.8. 为应用程序部署负载均衡器

流程

1. 输入以下命令验证您的 pod 是否正在运行：

   $ oc get pods -A

   输出示例

   NAMESPACE                            NAME                                                     READY   STATUS   RESTARTS  AGE
   default                              i-06166fbb376f14a8bus-west-2computeinternal-debug-qtwcr  1/1     Running	   0		   46m
   kube-system                          csi-snapshot-controller-5c6586d546-lprv4                 1/1     Running	   0		   51m
   kube-system                          csi-snapshot-webhook-6bf8ddc7f5-kz6k9                    1/1     Running	   0		   51m
   openshift-dns                        dns-default-45jl7                                        2/2     Running	   0		   50m
   openshift-dns                        node-resolver-7wmzf                                      1/1     Running	   0		   51m
   openshift-ingress                    router-default-78b86fbf9d-qvj9s                          1/1     Running 	 0		   51m
   openshift-multus                     dhcp-daemon-j7qnf                                        1/1     Running    0		   51m
   openshift-multus                     multus-r758z                                             1/1     Running    0		   51m
   openshift-operator-lifecycle-manager catalog-operator-85fb86fcb9-t6zm7                        1/1     Running    0		   51m
   openshift-operator-lifecycle-manager olm-operator-87656d995-fvz84                             1/1     Running    0		   51m
   openshift-ovn-kubernetes             ovnkube-master-5rfhh                                     4/4     Running    0		   51m
   openshift-ovn-kubernetes             ovnkube-node-gcnt6                                       1/1     Running    0		   51m
   openshift-service-ca                 service-ca-bf5b7c9f8-pn6rk                               1/1     Running    0		   51m
   openshift-storage                    topolvm-controller-549f7fbdd5-7vrmv                      5/5     Running    0		   51m
   openshift-storage                    topolvm-node-rht2m                                       3/3     Running    0		   50m

2. 运行以下命令来创建命名空间：

   $ NAMESPACE=<nginx-lb-test> 1

   1

   将 _<nginx-lb-test> 替换为您要创建的应用程序命名空间。

   $ oc create ns $NAMESPACE

   命名空间示例

   以下示例在创建的命名空间中部署测试 nginx 应用程序的三个副本：

   oc apply -n $NAMESPACE -f - <<EOF
   apiVersion: v1
   kind: ConfigMap
   metadata:
     name: nginx
   data:
     headers.conf: |
       add_header X-Server-IP  \$server_addr always;
   ---
   apiVersion: apps/v1
   kind: Deployment
   metadata:
     name: nginx
   spec:
     replicas: 3
     selector:
       matchLabels:
         app: nginx
     template:
       metadata:
         labels:
           app: nginx
       spec:
         containers:
         - image: quay.io/packit/nginx-unprivileged
           imagePullPolicy: Always
           name: nginx
           ports:
           - containerPort: 8080
           volumeMounts:
           - name: nginx-configs
             subPath: headers.conf
             mountPath: /etc/nginx/conf.d/headers.conf
           securityContext:
             allowPrivilegeEscalation: false
             seccompProfile:
               type: RuntimeDefault
             capabilities:
               drop: ["ALL"]
             runAsNonRoot: true
         volumes:
           - name: nginx-configs
             configMap:
               name: nginx
               items:
                 - key: headers.conf
                   path: headers.conf
   EOF

3. 您可以运行以下命令来验证三个副本是否已成功启动：

   $ oc get pods -n $NAMESPACE

4. 运行以下命令，为 nginx 测试应用程序创建 LoadBalancer 服务：

   oc create -n $NAMESPACE -f - <<EOF
   apiVersion: v1
   kind: Service
   metadata:
     name: nginx
   spec:
     ports:
     - port: 81
       targetPort: 8080
     selector:
       app: nginx
     type: LoadBalancer
   EOF

   注意

   您必须确保 port 参数是一个没有被其他 LoadBalancer 服务或 MicroShift 组件占用的主机端口。

5. 运行以下命令，验证服务文件是否存在，是否正确分配了外部 IP 地址，并且外部 IP 与节点 IP 相同：

   $ oc get svc -n $NAMESPACE

   输出示例

   NAME    TYPE           CLUSTER-IP      EXTERNAL-IP     PORT(S)        AGE
   nginx   LoadBalancer   10.43.183.104   192.168.1.241   81:32434/TCP   2m