11.2. 使用 CLI 配置健康检查

要配置就绪度、存活度和启动探测，将一个或多个探测添加到包含要执行健康检查的容器的 pod 规格中

注意

如果要在现有 pod 中添加或编辑健康检查，您必须编辑 pod DeploymentConfig 对象或使用 Web 控制台。您不能使用 CLI 添加或编辑现有 pod 的健康检查。

流程

为容器添加探测：

创建 Pod 对象来添加一个或多个探测：
```
apiVersion: v1
kind: Pod
metadata:
  labels:
    test: health-check
  name: my-application
spec:
  containers:
  - name: my-container 
    args:
    image: registry.k8s.io/goproxy:0.1 
    livenessProbe: 
      tcpSocket:  
        port: 8080 
      initialDelaySeconds: 15 
      periodSeconds: 20 
      timeoutSeconds: 10 
    readinessProbe: 
      httpGet: 
        host: my-host 
        scheme: HTTPS 
        path: /healthz
        port: 8080 
    startupProbe: 
      exec: 
        command: 
        - cat
        - /tmp/healthy
      failureThreshold: 30 
      periodSeconds: 20 
      timeoutSeconds: 10 
```
```
apiVersion: v1
kind: Pod
metadata:
  labels:
    test: health-check
  name: my-application
spec:
  containers:
  - name: my-container 
```
1
```
    args:
    image: registry.k8s.io/goproxy:0.1 
```
2
```
    livenessProbe: 
```
3
```
      tcpSocket:  
```
4
```
        port: 8080 
```
5
```
      initialDelaySeconds: 15 
```
6
```
      periodSeconds: 20 
```
7
```
      timeoutSeconds: 10 
```
8
```
    readinessProbe: 
```
9
```
      httpGet: 
```
10
```
        host: my-host 
```
11
```
        scheme: HTTPS 
```
12
```
        path: /healthz
        port: 8080 
```
13
```
    startupProbe: 
```
14
```
      exec: 
```
15
```
        command: 
```
16
```
        - cat
        - /tmp/healthy
      failureThreshold: 30 
```
17
```
      periodSeconds: 20 
```
18
```
      timeoutSeconds: 10 
```
19
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1
指定容器名称。
2
指定要部署的容器镜像。
3
可选：创建一个存活度探测。
4
指定要执行的测试，这里是一个 TCP 套接字测试。
5
指定容器正在侦听的端口。
6
指定在调度探测前容器需要已启动的时间（以秒为单位）。
7
指定执行这个探测的秒数。默认值为 10。这个值必须大于 timeoutSeconds。
8
指定一个秒数，在不活跃的时间超过这个值时探测被认为是失败的。默认值为 1。这个值必须小于 periodSeconds。
9
可选：创建一个就绪度探测。
10
指定要执行的测试类型，这里是 HTTP 测试。
11
指定主机 IP 地址。如果未定义 host，则使用 PodIP。
12
指定 HTTP 或 HTTPS。如果未定义 scheme，则使用 HTTP 方案。
13
指定容器正在侦听的端口。
14
可选：创建一个启动探测。
15
指定要执行的测试类型，这里是一个容器执行探测。
16
指定要在容器上执行的命令。
17
指定失败后测试探测的次数。
18
指定执行这个探测的秒数。默认值为 10。这个值必须大于 timeoutSeconds。
19
指定一个秒数，在不活跃的时间超过这个值时探测被认为是失败的。默认值为 1。这个值必须小于 periodSeconds。
注意
如果 initialDelaySeconds 的值低于 periodSeconds 值，则第一个就绪度探测会因计时器的问题在两个阶段间进行。
timeoutSeconds 值必须小于 periodSeconds 值。
创建 Pod 对象：
```
oc create -f <file-name>.yaml
```
```
$ oc create -f <file-name>.yaml
```
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验证健康检查 pod 的状态：

oc describe pod my-application

$ oc describe pod my-application

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Toggle word wrap

输出示例

Events:
  Type    Reason     Age   From                                  Message
  ----    ------     ----  ----                                  -------
  Normal  Scheduled  9s    default-scheduler                     Successfully assigned openshift-logging/liveness-exec to ip-10-0-143-40.ec2.internal
  Normal  Pulling    2s    kubelet, ip-10-0-143-40.ec2.internal  pulling image "registry.k8s.io/liveness"
  Normal  Pulled     1s    kubelet, ip-10-0-143-40.ec2.internal  Successfully pulled image "registry.k8s.io/liveness"
  Normal  Created    1s    kubelet, ip-10-0-143-40.ec2.internal  Created container
  Normal  Started    1s    kubelet, ip-10-0-143-40.ec2.internal  Started container

Events:
  Type    Reason     Age   From                                  Message
  ----    ------     ----  ----                                  -------
  Normal  Scheduled  9s    default-scheduler                     Successfully assigned openshift-logging/liveness-exec to ip-10-0-143-40.ec2.internal
  Normal  Pulling    2s    kubelet, ip-10-0-143-40.ec2.internal  pulling image "registry.k8s.io/liveness"
  Normal  Pulled     1s    kubelet, ip-10-0-143-40.ec2.internal  Successfully pulled image "registry.k8s.io/liveness"
  Normal  Created    1s    kubelet, ip-10-0-143-40.ec2.internal  Created container
  Normal  Started    1s    kubelet, ip-10-0-143-40.ec2.internal  Started container

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以下是重启容器失败的探测的输出：

不健康容器存活度检查输出示例

oc describe pod pod1

$ oc describe pod pod1

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Toggle word wrap

输出示例

....

Events:
  Type     Reason          Age                From                                               Message
  ----     ------          ----               ----                                               -------
  Normal   Scheduled       <unknown>                                                             Successfully assigned aaa/liveness-http to ci-ln-37hz77b-f76d1-wdpjv-worker-b-snzrj
  Normal   AddedInterface  47s                multus                                             Add eth0 [10.129.2.11/23]
  Normal   Pulled          46s                kubelet, ci-ln-37hz77b-f76d1-wdpjv-worker-b-snzrj  Successfully pulled image "registry.k8s.io/liveness" in 773.406244ms
  Normal   Pulled          28s                kubelet, ci-ln-37hz77b-f76d1-wdpjv-worker-b-snzrj  Successfully pulled image "registry.k8s.io/liveness" in 233.328564ms
  Normal   Created         10s (x3 over 46s)  kubelet, ci-ln-37hz77b-f76d1-wdpjv-worker-b-snzrj  Created container liveness
  Normal   Started         10s (x3 over 46s)  kubelet, ci-ln-37hz77b-f76d1-wdpjv-worker-b-snzrj  Started container liveness
  Warning  Unhealthy       10s (x6 over 34s)  kubelet, ci-ln-37hz77b-f76d1-wdpjv-worker-b-snzrj  Liveness probe failed: HTTP probe failed with statuscode: 500
  Normal   Killing         10s (x2 over 28s)  kubelet, ci-ln-37hz77b-f76d1-wdpjv-worker-b-snzrj  Container liveness failed liveness probe, will be restarted
  Normal   Pulling         10s (x3 over 47s)  kubelet, ci-ln-37hz77b-f76d1-wdpjv-worker-b-snzrj  Pulling image "registry.k8s.io/liveness"
  Normal   Pulled          10s                kubelet, ci-ln-37hz77b-f76d1-wdpjv-worker-b-snzrj  Successfully pulled image "registry.k8s.io/liveness" in 244.116568ms

....

Events:
  Type     Reason          Age                From                                               Message
  ----     ------          ----               ----                                               -------
  Normal   Scheduled       <unknown>                                                             Successfully assigned aaa/liveness-http to ci-ln-37hz77b-f76d1-wdpjv-worker-b-snzrj
  Normal   AddedInterface  47s                multus                                             Add eth0 [10.129.2.11/23]
  Normal   Pulled          46s                kubelet, ci-ln-37hz77b-f76d1-wdpjv-worker-b-snzrj  Successfully pulled image "registry.k8s.io/liveness" in 773.406244ms
  Normal   Pulled          28s                kubelet, ci-ln-37hz77b-f76d1-wdpjv-worker-b-snzrj  Successfully pulled image "registry.k8s.io/liveness" in 233.328564ms
  Normal   Created         10s (x3 over 46s)  kubelet, ci-ln-37hz77b-f76d1-wdpjv-worker-b-snzrj  Created container liveness
  Normal   Started         10s (x3 over 46s)  kubelet, ci-ln-37hz77b-f76d1-wdpjv-worker-b-snzrj  Started container liveness
  Warning  Unhealthy       10s (x6 over 34s)  kubelet, ci-ln-37hz77b-f76d1-wdpjv-worker-b-snzrj  Liveness probe failed: HTTP probe failed with statuscode: 500
  Normal   Killing         10s (x2 over 28s)  kubelet, ci-ln-37hz77b-f76d1-wdpjv-worker-b-snzrj  Container liveness failed liveness probe, will be restarted
  Normal   Pulling         10s (x3 over 47s)  kubelet, ci-ln-37hz77b-f76d1-wdpjv-worker-b-snzrj  Pulling image "registry.k8s.io/liveness"
  Normal   Pulled          10s                kubelet, ci-ln-37hz77b-f76d1-wdpjv-worker-b-snzrj  Successfully pulled image "registry.k8s.io/liveness" in 244.116568ms

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11.2. 使用 CLI 配置健康检查

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