43.5. 测试自动扩展

流程

1. 创建 scale-up.yaml 文件，其中包含用于测试自动扩展的部署配置：

   apiVersion: apps/v1
   kind: Deployment
   metadata:
     name: scale-up
     labels:
       app: scale-up
   spec:
     replicas: 20 

   1

   
     selector:
       matchLabels:
         app: scale-up
     template:
       metadata:
         labels:
           app: scale-up
       spec:
         containers:
         - name: origin-base
           image: openshift/origin-base
           resources:
             requests:
               memory: 2Gi
           command:
           - /bin/sh
           - "-c"
           - "echo 'this should be in the logs' && sleep 86400"
         terminationGracePeriodSeconds: 0

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   1

   此部署指定 20 个副本，但集群的初始大小在没有首先增加计算节点数量的情况下无法运行所有 pod。

2. 为部署创建一个命名空间：

   $ oc apply -f - <<EOF
   apiVersion: v1
   kind: Namespace
   metadata:
     name: autoscaler-demo
   EOF

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3. 部署配置：

   $ oc apply -n autoscaler-demo -f scale-up.yaml

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4. 查看命名空间中的 pod：

   1. 查看在命名空间中运行的 pod:

      $ oc get pods -n autoscaler-demo | grep Running
      cluster-autoscaler-5485644d46-ggvn5   1/1       Running   0          1d
      scale-up-79684ff956-45sbg             1/1       Running   0          31s
      scale-up-79684ff956-4kzjv             1/1       Running   0          31s
      scale-up-79684ff956-859d2             1/1       Running   0          31s
      scale-up-79684ff956-h47gv             1/1       Running   0          31s
      scale-up-79684ff956-htjth             1/1       Running   0          31s
      scale-up-79684ff956-m996k             1/1       Running   0          31s
      scale-up-79684ff956-pvvrm             1/1       Running   0          31s
      scale-up-79684ff956-qs9pp             1/1       Running   0          31s
      scale-up-79684ff956-zwdpr             1/1       Running   0          31s

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   2. 查看命名空间中的待处理 pod：

      $ oc get pods -n autoscaler-demo | grep Pending
      scale-up-79684ff956-5jdnj             0/1       Pending   0          40s
      scale-up-79684ff956-794d6             0/1       Pending   0          40s
      scale-up-79684ff956-7rlm2             0/1       Pending   0          40s
      scale-up-79684ff956-9m2jc             0/1       Pending   0          40s
      scale-up-79684ff956-9m5fn             0/1       Pending   0          40s
      scale-up-79684ff956-fr62m             0/1       Pending   0          40s
      scale-up-79684ff956-q255w             0/1       Pending   0          40s
      scale-up-79684ff956-qc2cn             0/1       Pending   0          40s
      scale-up-79684ff956-qjn7z             0/1       Pending   0          40s
      scale-up-79684ff956-tdmqt             0/1       Pending   0          40s
      scale-up-79684ff956-xnjhw             0/1       Pending   0          40s

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      在集群自动扩展自动置备新计算节点以运行 pod 前，这些待处理的 pod 无法运行。节点可以在几分钟内，处于 Ready 状态。

5. 几分钟后，检查节点列表以查看新节点是否就绪：

   $ oc get nodes
   NAME                            STATUS    ROLES     AGE       VERSION
   ip-172-31-49-172.ec2.internal   Ready     infra     1d        v1.11.0+d4cacc0
   ip-172-31-53-217.ec2.internal   Ready     compute   7m        v1.11.0+d4cacc0
   ip-172-31-55-89.ec2.internal    Ready     compute   9h        v1.11.0+d4cacc0
   ip-172-31-56-21.ec2.internal    Ready     compute   7m        v1.11.0+d4cacc0
   ip-172-31-56-71.ec2.internal    Ready     compute   7m        v1.11.0+d4cacc0
   ip-172-31-63-234.ec2.internal   Ready     master    1d        v1.11.0+d4cacc0

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6. 当更多节点就绪时，再次查看在命名空间中运行的 pod:

   $ oc get pods -n autoscaler-demo
   NAME                                  READY     STATUS    RESTARTS   AGE
   cluster-autoscaler-5485644d46-ggvn5   1/1       Running   0          1d
   scale-up-79684ff956-45sbg             1/1       Running   0          8m
   scale-up-79684ff956-4kzjv             1/1       Running   0          8m
   scale-up-79684ff956-5jdnj             1/1       Running   0          8m
   scale-up-79684ff956-794d6             1/1       Running   0          8m
   scale-up-79684ff956-7rlm2             1/1       Running   0          8m
   scale-up-79684ff956-859d2             1/1       Running   0          8m
   scale-up-79684ff956-9m2jc             1/1       Running   0          8m
   scale-up-79684ff956-9m5fn             1/1       Running   0          8m
   scale-up-79684ff956-fr62m             1/1       Running   0          8m
   scale-up-79684ff956-h47gv             1/1       Running   0          8m
   scale-up-79684ff956-htjth             1/1       Running   0          8m
   scale-up-79684ff956-m996k             1/1       Running   0          8m
   scale-up-79684ff956-pvvrm             1/1       Running   0          8m
   scale-up-79684ff956-q255w             1/1       Running   0          8m
   scale-up-79684ff956-qc2cn             1/1       Running   0          8m
   scale-up-79684ff956-qjn7z             1/1       Running   0          8m
   scale-up-79684ff956-qs9pp             1/1       Running   0          8m
   scale-up-79684ff956-tdmqt             1/1       Running   0          8m
   scale-up-79684ff956-xnjhw             1/1       Running   0          8m
   scale-up-79684ff956-zwdpr             1/1       Running   0          8m
   ...

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