扩展应用

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小牛编辑

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2023-12-01

目的

使用部署配置来部署多个 Pod，并以此扩展缩放应用。

环境

openshift v3.11.16/kubernetes v1.11.0

步骤

创建工程

1. CLI 登录到 OCP

$ oc login https://master.example.com:8443 -u admin -p admin

2. 创建工程

$ oc new-project lab08

创建一个新应用，测试缩放

1. 创建一个应用，导出定义到 scaling.yml

#  oc new-app -o yaml --name=lab08 -i php:7.0 https://github.com/redhat-china/scaling.git > scaling.yml

2. 编辑 scaling.yml，DeploymentConfig 部分 replicas 设为 3

- apiVersion: apps.openshift.io/v1
  kind: DeploymentConfig
  metadata:
    annotations:
      openshift.io/generated-by: OpenShiftNewApp
    creationTimestamp: null
    labels:
      app: lab08
    name: lab08
  spec:
    replicas: 3

3. 创建应用

# oc create -f scaling.yml
imagestream.image.openshift.io/lab08 created
buildconfig.build.openshift.io/lab08 created
deploymentconfig.apps.openshift.io/lab08 created
service/lab08 created

4. 查看创建的 Pod

# oc get pods
NAME            READY     STATUS      RESTARTS   AGE
lab08-1-build   0/1       Completed   0          1m
lab08-1-f654z   1/1       Running     0          32s
lab08-1-n7cgl   1/1       Running     0          32s
lab08-1-wjgqs   1/1       Running     0          32s

5. 创建路由

# oc expose svc lab08 --hostname=lab08.apps.example.com

6. 访问测试

# for i in {1..5}; do curl -s http://lab08.apps.example.com ; done
Server ID: 10.244.4.115
Server ID: 10.244.8.59
Server ID: 10.244.8.60
Server ID: 10.244.4.115
Server ID: 10.244.8.59

扩展到更多节点

1. 查看当前 Replicas 数量

# oc describe dc lab08 | grep Replicas
Replicas:	3
	Replicas:	3 current / 3 desired

3. 扩展到 5 个 Pod

# oc scale --replicas=5 dc lab08
deploymentconfig.apps.openshift.io/lab08 scaled

4. 查看当前运行的 Pod

# oc get pods
NAME            READY     STATUS      RESTARTS   AGE
lab08-1-build   0/1       Completed   0          11m
lab08-1-f654z   1/1       Running     0          10m
lab08-1-lxpj9   1/1       Running     0          1m
lab08-1-n7cgl   1/1       Running     0          10m
lab08-1-vdjzn   1/1       Running     0          1m
lab08-1-wjgqs   1/1       Running     0          10m

5. 访问测试

# for i in {1..5}; do curl -s http://lab08.apps.example.com ; done
Server ID: 10.244.4.115
Server ID: 10.244.8.59
Server ID: 10.244.8.60
Server ID: 10.244.8.61
Server ID: 10.244.8.62