k8s 更新应用程序

参考：https://kubernetes.io/docs/tutorials/kubernetes-basics/

更新应用程序

用户希望应用程序始终可用，开发人员每天需要部署几次新版本的应用程序。在Kubernetes中，这是通过滚动更新完成的。滚动更新允许部署的更新在零停机时间的情况下进行，方法是用新实例增量地更新Pods实例。新的PODS将安排在有可用资源的节点上。

步骤1：更新应用程序的版本

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$ kubectl get deployments
NAME                  READY   UP-TO-DATE   AVAILABLE   AGE
kubernetes-bootcamp   4/4     4            4           2m4s
$ kubectl get pods
NAME                                   READY   STATUS    RESTARTS   AGE
kubernetes-bootcamp-6bf84cb898-7fgv8   1/1     Running   0          2m1s
kubernetes-bootcamp-6bf84cb898-t9slq   1/1     Running   0          2m1s
kubernetes-bootcamp-6bf84cb898-tvlw7   1/1     Running   0          2m1s
kubernetes-bootcamp-6bf84cb898-zqfj6   1/1     Running   0          2m
$ kubectl describe pods
Name:               kubernetes-bootcamp-6bf84cb898-7fgv8
Namespace:          default
Priority:           0
PriorityClassName:  <none>
Node:               minikube/172.17.0.54
Start Time:         Tue, 09 Apr 2019 07:12:34 +0000
Labels:             pod-template-hash=6bf84cb898
                    run=kubernetes-bootcamp
Annotations:        <none>
Status:             Running
IP:                 172.18.0.4
Controlled By:      ReplicaSet/kubernetes-bootcamp-6bf84cb898
Containers:
  kubernetes-bootcamp:
    Container ID:   docker://8a63d8f20c262c6ac85509c068b98f3c75074ea51511734310616cc312a23c6d
    Image:          gcr.io/google-samples/kubernetes-bootcamp:v1  #镜像版本
    Image ID:       docker-pullable://jocatalin/kubernetes-bootcamp@sha256:0d6b8ee63bb57c5f5b6156f446b3bc3b3c143d233037f3a2f00e279c8fcc64af
    Port:           8080/TCP
    Host Port:      0/TCP
    State:          Running
      Started:      Tue, 09 Apr 2019 07:12:35 +0000
    Ready:          True
    Restart Count:  0
    Environment:    <none>
    Mounts:
      /var/run/secrets/kubernetes.io/serviceaccount from default-token-6z8g2 (ro)
Conditions:
  Type              Status
  Initialized       True
  Ready             True
  ContainersReady   True
  PodScheduled      True
Volumes:
  default-token-6z8g2:
    Type:        Secret (a volume populated by a Secret)
    SecretName:  default-token-6z8g2
    Optional:    false
QoS Class:       BestEffort
Node-Selectors:  <none>
Tolerations:     node.kubernetes.io/not-ready:NoExecute for 300s
                 node.kubernetes.io/unreachable:NoExecute for 300s
Events:
  Type    Reason     Age    From               Message
  ----    ------     ----   ----               -------
  Normal  Scheduled  2m24s  default-scheduler  Successfully assigned default/kubernetes-bootcamp-6bf84cb898-7fgv8 to minikube
  Normal  Pulled     2m24s  kubelet, minikube  Container image "gcr.io/google-samples/kubernetes-bootcamp:v1" already present on machine
  Normal  Created    2m24s  kubelet, minikube  Created container
  Normal  Started    2m23s  kubelet, minikube  Started container
 
 
Name:               kubernetes-bootcamp-6bf84cb898-t9slq
Namespace:          default
Priority:           0
PriorityClassName:  <none>
Node:               minikube/172.17.0.54
Start Time:         Tue, 09 Apr 2019 07:12:34 +0000
Labels:             pod-template-hash=6bf84cb898
                    run=kubernetes-bootcamp
Annotations:        <none>
Status:             Running
IP:                 172.18.0.7
Controlled By:      ReplicaSet/kubernetes-bootcamp-6bf84cb898
Containers:
  kubernetes-bootcamp:
    Container ID:   docker://926024b884fc353705a542dcef5d6b3ddf0c0dd0c43ef32f1e95a95391f65175
    Image:          gcr.io/google-samples/kubernetes-bootcamp:v1
    Image ID:       docker-pullable://jocatalin/kubernetes-bootcamp@sha256:0d6b8ee63bb57c5f5b6156f446b3bc3b3c143d233037f3a2f00e279c8fcc64af
    Port:           8080/TCP
    Host Port:      0/TCP
    State:          Running
      Started:      Tue, 09 Apr 2019 07:12:37 +0000
    Ready:          True
    Restart Count:  0
    Environment:    <none>
    Mounts:
      /var/run/secrets/kubernetes.io/serviceaccount from default-token-6z8g2 (ro)
Conditions:
  Type              Status
  Initialized       True
  Ready             True
  ContainersReady   True
  PodScheduled      True
Volumes:
  default-token-6z8g2:
    Type:        Secret (a volume populated by a Secret)
    SecretName:  default-token-6z8g2
    Optional:    false
QoS Class:       BestEffort
Node-Selectors:  <none>
Tolerations:     node.kubernetes.io/not-ready:NoExecute for 300s
                 node.kubernetes.io/unreachable:NoExecute for 300s
Events:
  Type    Reason     Age    From               Message
  ----    ------     ----   ----               -------
  Normal  Scheduled  2m24s  default-scheduler  Successfully assigned default/kubernetes-bootcamp-6bf84cb898-t9slq to minikube
  Normal  Pulled     2m22s  kubelet, minikube  Container image "gcr.io/google-samples/kubernetes-bootcamp:v1" already present on machine
  Normal  Created    2m22s  kubelet, minikube  Created container
  Normal  Started    2m21s  kubelet, minikube  Started container
 
 
Name:               kubernetes-bootcamp-6bf84cb898-tvlw7
Namespace:          default
Priority:           0
PriorityClassName:  <none>
Node:               minikube/172.17.0.54
Start Time:         Tue, 09 Apr 2019 07:12:34 +0000
Labels:             pod-template-hash=6bf84cb898
                    run=kubernetes-bootcamp
Annotations:        <none>
Status:             Running
IP:                 172.18.0.6
Controlled By:      ReplicaSet/kubernetes-bootcamp-6bf84cb898
Containers:
  kubernetes-bootcamp:
    Container ID:   docker://6e47947b7ce2d7295140e4d431901467a452e6e4fcb5226373cc237215831706
    Image:          gcr.io/google-samples/kubernetes-bootcamp:v1
    Image ID:       docker-pullable://jocatalin/kubernetes-bootcamp@sha256:0d6b8ee63bb57c5f5b6156f446b3bc3b3c143d233037f3a2f00e279c8fcc64af
    Port:           8080/TCP
    Host Port:      0/TCP
    State:          Running
      Started:      Tue, 09 Apr 2019 07:12:37 +0000
    Ready:          True
    Restart Count:  0
    Environment:    <none>
    Mounts:
      /var/run/secrets/kubernetes.io/serviceaccount from default-token-6z8g2 (ro)
Conditions:
  Type              Status
  Initialized       True
  Ready             True
  ContainersReady   True
  PodScheduled      True
Volumes:
  default-token-6z8g2:
    Type:        Secret (a volume populated by a Secret)
    SecretName:  default-token-6z8g2
    Optional:    false
QoS Class:       BestEffort
Node-Selectors:  <none>
Tolerations:     node.kubernetes.io/not-ready:NoExecute for 300s
                 node.kubernetes.io/unreachable:NoExecute for 300s
Events:
  Type    Reason     Age    From               Message
  ----    ------     ----   ----               -------
  Normal  Scheduled  2m25s  default-scheduler  Successfully assigned default/kubernetes-bootcamp-6bf84cb898-tvlw7 to minikube
  Normal  Pulled     2m23s  kubelet, minikube  Container image "gcr.io/google-samples/kubernetes-bootcamp:v1" already present on machine
  Normal  Created    2m22s  kubelet, minikube  Created container
  Normal  Started    2m21s  kubelet, minikube  Started container
 
 
Name:               kubernetes-bootcamp-6bf84cb898-zqfj6
Namespace:          default
Priority:           0
PriorityClassName:  <none>
Node:               minikube/172.17.0.54
Start Time:         Tue, 09 Apr 2019 07:12:34 +0000
Labels:             pod-template-hash=6bf84cb898
                    run=kubernetes-bootcamp
Annotations:        <none>
Status:             Running
IP:                 172.18.0.5
Controlled By:      ReplicaSet/kubernetes-bootcamp-6bf84cb898
Containers:
  kubernetes-bootcamp:
    Container ID:   docker://00cc46214182153a7eae9046041d5b3687c133799561064b0ee1bbaca7e48b11
    Image:          gcr.io/google-samples/kubernetes-bootcamp:v1  #镜像版本
    Image ID:       docker-pullable://jocatalin/kubernetes-bootcamp@sha256:0d6b8ee63bb57c5f5b6156f446b3bc3b3c143d233037f3a2f00e279c8fcc64af
    Port:           8080/TCP
    Host Port:      0/TCP
    State:          Running
      Started:      Tue, 09 Apr 2019 07:12:37 +0000
    Ready:          True
    Restart Count:  0
    Environment:    <none>
    Mounts:
      /var/run/secrets/kubernetes.io/serviceaccount from default-token-6z8g2 (ro)
Conditions:
  Type              Status
  Initialized       True
  Ready             True
  ContainersReady   True
  PodScheduled      True
Volumes:
  default-token-6z8g2:
    Type:        Secret (a volume populated by a Secret)
    SecretName:  default-token-6z8g2
    Optional:    false
QoS Class:       BestEffort
Node-Selectors:  <none>
Tolerations:     node.kubernetes.io/not-ready:NoExecute for 300s
                 node.kubernetes.io/unreachable:NoExecute for 300s
Events:
  Type    Reason     Age    From               Message
  ----    ------     ----   ----               -------
  Normal  Scheduled  2m24s  default-scheduler  Successfully assigned default/kubernetes-bootcamp-6bf84cb898-zqfj6 to minikube
  Normal  Pulled     2m23s  kubelet, minikube  Container image "gcr.io/google-samples/kubernetes-bootcamp:v1" already present on machine
  Normal  Created    2m22s  kubelet, minikube  Created container
  Normal  Started    2m21s  kubelet, minikube  Started container

若要将应用程序的映像更新为版本2，请使用set image 命令，然后是deployment 名称和 新镜像 版本：

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$ kubectl set image deployments/kubernetes-bootcamp kubernetes-bootcamp=jocatalin/kubernetes-bootcamp:v2
deployment.extensions/kubernetes-bootcamp image updated

该命令通知deployments为您的应用程序使用不同的映像，并启动滚动更新。并使用GET Pods命令查看新Pods的状态，之前的pods已经不存在：

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$ kubectl get pods
NAME                                   READY   STATUS    RESTARTS   AGE
kubernetes-bootcamp-5bf4d5689b-2xcfb   1/1     Running   0          2m2s
kubernetes-bootcamp-5bf4d5689b-mrbb6   1/1     Running   0          2m4s
kubernetes-bootcamp-5bf4d5689b-rjpl6   1/1     Running   0          2m3s
kubernetes-bootcamp-5bf4d5689b-rq62d   1/1     Running   0          2m4s

　　

步骤2：验证更新

首先，让我们检查应用程序是否正在运行。为了找出公开的IP和端口，我们可以使用describe service:

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$ kubectl describe services/kubernetes-bootcamp
Name:                     kubernetes-bootcamp
Namespace:                default
Labels:                   run=kubernetes-bootcamp
Annotations:              <none>
Selector:                 run=kubernetes-bootcamp
Type:                     NodePort
IP:                       10.111.214.229
Port:                     <unset>  8080/TCP
TargetPort:               8080/TCP
NodePort:                 <unset>  32217/TCP
Endpoints:                172.18.0.10:8080,172.18.0.11:8080,172.18.0.8:8080 + 1 more...
Session Affinity:         None
External Traffic Policy:  Cluster
Events:                   <none>

创建一个名为Node_Port的环境变量，该变量的节点端口值为：

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$ export NODE_PORT=$(kubectl get services/kubernetes-bootcamp -o go-template='{{(index .spec.ports 0).nodePort}}')
$ echo NODE_PORT=$NODE_PORT
NODE_PORT=32217

接下来，我们将对公开的IP和端口进行curl：

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$ curl $(minikube ip):$NODE_PORT
Hello Kubernetes bootcamp! | Running on: kubernetes-bootcamp-5bf4d5689b-mrbb6 | v=2

我们使用每个请求访问不同的Pod，我们看到所有的Pods都在运行最新版本(V2)。

 

还可以通过运行滚出状态命令来确认更新：

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$ kubectl rollout status deployments/kubernetes-bootcamp
deployment "kubernetes-bootcamp" successfully rolled out

　　

若要查看该应用程序的当前图像版本，请对Pods运行描述命令：

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$ kubectl describe pods
Name:               kubernetes-bootcamp-5bf4d5689b-2xcfb
Namespace:          default
Priority:           0
PriorityClassName:  <none>
Node:               minikube/172.17.0.54
Start Time:         Tue, 09 Apr 2019 07:18:44 +0000
Labels:             pod-template-hash=5bf4d5689b
                    run=kubernetes-bootcamp
Annotations:        <none>
Status:             Running
IP:                 172.18.0.11
Controlled By:      ReplicaSet/kubernetes-bootcamp-5bf4d5689b
Containers:
  kubernetes-bootcamp:
    Container ID:   docker://7adbc5afbaa8d7763f17529f0b54731c003b7c114e2b0e6936a17b9b6406993a
    Image:          jocatalin/kubernetes-bootcamp:v2
    Image ID:       docker-pullable://jocatalin/kubernetes-bootcamp@sha256:fb1a3ced00cecfc1f83f18ab5cd14199e30adc1b49aa4244f5d65ad3f5feb2a5
    Port:           8080/TCP
    Host Port:      0/TCP
    State:          Running
      Started:      Tue, 09 Apr 2019 07:18:45 +0000
    Ready:          True
    Restart Count:  0
    Environment:    <none>
    Mounts:
      /var/run/secrets/kubernetes.io/serviceaccount from default-token-6z8g2 (ro)
Conditions:
  Type              Status
  Initialized       True
  Ready             True
  ContainersReady   True
  PodScheduled      True
Volumes:
  default-token-6z8g2:
    Type:        Secret (a volume populated by a Secret)
    SecretName:  default-token-6z8g2
    Optional:    false
QoS Class:       BestEffort
Node-Selectors:  <none>
Tolerations:     node.kubernetes.io/not-ready:NoExecute for 300s
                 node.kubernetes.io/unreachable:NoExecute for 300s
Events:
  Type    Reason     Age   From               Message
  ----    ------     ----  ----               -------
  Normal  Scheduled  10m   default-scheduler  Successfully assigned default/kubernetes-bootcamp-5bf4d5689b-2xcfb to minikube
  Normal  Pulled     10m   kubelet, minikube  Container image "jocatalin/kubernetes-bootcamp:v2" already present on machine
  Normal  Created    10m   kubelet, minikube  Created container
  Normal  Started    10m   kubelet, minikube  Started container
 
 
Name:               kubernetes-bootcamp-5bf4d5689b-mrbb6
Namespace:          default
Priority:           0
PriorityClassName:  <none>
Node:               minikube/172.17.0.54
Start Time:         Tue, 09 Apr 2019 07:18:42 +0000
Labels:             pod-template-hash=5bf4d5689b
                    run=kubernetes-bootcamp
Annotations:        <none>
Status:             Running
IP:                 172.18.0.9
Controlled By:      ReplicaSet/kubernetes-bootcamp-5bf4d5689b
Containers:
  kubernetes-bootcamp:
    Container ID:   docker://49a606c599140f370953d2c5ecdfd56fe2149497635eaf650977376727fd1334
    Image:          jocatalin/kubernetes-bootcamp:v2
    Image ID:       docker-pullable://jocatalin/kubernetes-bootcamp@sha256:fb1a3ced00cecfc1f83f18ab5cd14199e30adc1b49aa4244f5d65ad3f5feb2a5
    Port:           8080/TCP
    Host Port:      0/TCP
    State:          Running
      Started:      Tue, 09 Apr 2019 07:18:43 +0000
    Ready:          True
    Restart Count:  0
    Environment:    <none>
    Mounts:
      /var/run/secrets/kubernetes.io/serviceaccount from default-token-6z8g2 (ro)
Conditions:
  Type              Status
  Initialized       True
  Ready             True
  ContainersReady   True
  PodScheduled      True
Volumes:
  default-token-6z8g2:
    Type:        Secret (a volume populated by a Secret)
    SecretName:  default-token-6z8g2
    Optional:    false
QoS Class:       BestEffort
Node-Selectors:  <none>
Tolerations:     node.kubernetes.io/not-ready:NoExecute for 300s
                 node.kubernetes.io/unreachable:NoExecute for 300s
Events:
  Type    Reason     Age   From               Message
  ----    ------     ----  ----               -------
  Normal  Scheduled  10m   default-scheduler  Successfully assigned default/kubernetes-bootcamp-5bf4d5689b-mrbb6 to minikube
  Normal  Pulled     10m   kubelet, minikube  Container image "jocatalin/kubernetes-bootcamp:v2" already present on machine
  Normal  Created    10m   kubelet, minikube  Created container
  Normal  Started    10m   kubelet, minikube  Started container
 
 
Name:               kubernetes-bootcamp-5bf4d5689b-rjpl6
Namespace:          default
Priority:           0
PriorityClassName:  <none>
Node:               minikube/172.17.0.54
Start Time:         Tue, 09 Apr 2019 07:18:43 +0000
Labels:             pod-template-hash=5bf4d5689b
                    run=kubernetes-bootcamp
Annotations:        <none>
Status:             Running
IP:                 172.18.0.10
Controlled By:      ReplicaSet/kubernetes-bootcamp-5bf4d5689b
Containers:
  kubernetes-bootcamp:
    Container ID:   docker://147bc6dec7d9e8036e4d23c0eaad891216d1c67921052c7c3ee30263c0116c55
    Image:          jocatalin/kubernetes-bootcamp:v2
    Image ID:       docker-pullable://jocatalin/kubernetes-bootcamp@sha256:fb1a3ced00cecfc1f83f18ab5cd14199e30adc1b49aa4244f5d65ad3f5feb2a5
    Port:           8080/TCP
    Host Port:      0/TCP
    State:          Running
      Started:      Tue, 09 Apr 2019 07:18:43 +0000
    Ready:          True
    Restart Count:  0
    Environment:    <none>
    Mounts:
      /var/run/secrets/kubernetes.io/serviceaccount from default-token-6z8g2 (ro)
Conditions:
  Type              Status
  Initialized       True
  Ready             True
  ContainersReady   True
  PodScheduled      True
Volumes:
  default-token-6z8g2:
    Type:        Secret (a volume populated by a Secret)
    SecretName:  default-token-6z8g2
    Optional:    false
QoS Class:       BestEffort
Node-Selectors:  <none>
Tolerations:     node.kubernetes.io/not-ready:NoExecute for 300s
                 node.kubernetes.io/unreachable:NoExecute for 300s
Events:
  Type    Reason     Age   From               Message
  ----    ------     ----  ----               -------
  Normal  Scheduled  10m   default-scheduler  Successfully assigned default/kubernetes-bootcamp-5bf4d5689b-rjpl6 to minikube
  Normal  Pulled     10m   kubelet, minikube  Container image "jocatalin/kubernetes-bootcamp:v2" already present on machine
  Normal  Created    10m   kubelet, minikube  Created container
  Normal  Started    10m   kubelet, minikube  Started container
 
 
Name:               kubernetes-bootcamp-5bf4d5689b-rq62d
Namespace:          default
Priority:           0
PriorityClassName:  <none>
Node:               minikube/172.17.0.54
Start Time:         Tue, 09 Apr 2019 07:18:42 +0000
Labels:             pod-template-hash=5bf4d5689b
                    run=kubernetes-bootcamp
Annotations:        <none>
Status:             Running
IP:                 172.18.0.8
Controlled By:      ReplicaSet/kubernetes-bootcamp-5bf4d5689b
Containers:
  kubernetes-bootcamp:
    Container ID:   docker://ba622412c3b9350df9212c3b677d1560e1b7e37cb909c262ce73153e7ff99b2c
    Image:          jocatalin/kubernetes-bootcamp:v2
    Image ID:       docker-pullable://jocatalin/kubernetes-bootcamp@sha256:fb1a3ced00cecfc1f83f18ab5cd14199e30adc1b49aa4244f5d65ad3f5feb2a5
    Port:           8080/TCP
    Host Port:      0/TCP
    State:          Running
      Started:      Tue, 09 Apr 2019 07:18:43 +0000
    Ready:          True
    Restart Count:  0
    Environment:    <none>
    Mounts:
      /var/run/secrets/kubernetes.io/serviceaccount from default-token-6z8g2 (ro)
Conditions:
  Type              Status
  Initialized       True
  Ready             True
  ContainersReady   True
  PodScheduled      True
Volumes:
  default-token-6z8g2:
    Type:        Secret (a volume populated by a Secret)
    SecretName:  default-token-6z8g2
    Optional:    false
QoS Class:       BestEffort
Node-Selectors:  <none>
Tolerations:     node.kubernetes.io/not-ready:NoExecute for 300s
                 node.kubernetes.io/unreachable:NoExecute for 300s
Events:
  Type    Reason     Age   From               Message
  ----    ------     ----  ----               -------
  Normal  Scheduled  10m   default-scheduler  Successfully assigned default/kubernetes-bootcamp-5bf4d5689b-rq62d to minikube
  Normal  Pulled     10m   kubelet, minikube  Container image "jocatalin/kubernetes-bootcamp:v2" already present on machine
  Normal  Created    10m   kubelet, minikube  Created container
  Normal  Started    10m   kubelet, minikube  Started container

 

步骤3：回滚更新

查看deployments的状态：

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$ kubectl get deployments
NAME                  READY   UP-TO-DATE   AVAILABLE   AGE
kubernetes-bootcamp   3/4     2            3           23m

出了点问题…我们没有所需数量（available状态）的pods。再次列出Pods：

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$ kubectl get pods
NAME                                   READY   STATUS             RESTARTS   AGE
kubernetes-bootcamp-597cfc5b76-bc46g   0/1     ImagePullBackOff   0          8m25s　　#状态：镜像拉回，让我们把镜像还原回原来的版本。
kubernetes-bootcamp-597cfc5b76-gh76q   0/1     ImagePullBackOff   0          8m25s
kubernetes-bootcamp-5bf4d5689b-mrbb6   1/1     Running            0          21m
kubernetes-bootcamp-5bf4d5689b-rjpl6   1/1     Running            0          21m
kubernetes-bootcamp-5bf4d5689b-rq62d   1/1     Running            0          21m

存储库中没有名为V10的映像。让我们回到我们以前的工作版本。我们将使用rollout命令

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$ kubectl rollout undo deployments/kubernetes-bootcamp
deployment.extensions/kubernetes-bootcamp rolled back

ROLLOUT命令将部署恢复到以前的已知状态(映像的v2版本)。更新是版本化的，您可以恢复到任何以前知道的部署状态。再次列出Pods：

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$ kubectl get pods
NAME                                   READY   STATUS    RESTARTS   AGE
kubernetes-bootcamp-5bf4d5689b-j54m4   1/1     Running   0          3m10s
kubernetes-bootcamp-5bf4d5689b-mrbb6   1/1     Running   0          27m
kubernetes-bootcamp-5bf4d5689b-rjpl6   1/1     Running   0          27m
kubernetes-bootcamp-5bf4d5689b-rq62d   1/1     Running   0          27m

四个pods在运行。再次检查它们的映像：

 

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$ kubectl describe pods
Name:               kubernetes-bootcamp-5bf4d5689b-j54m4
Namespace:          default
Priority:           0
PriorityClassName:  <none>
Node:               minikube/172.17.0.54
Start Time:         Tue, 09 Apr 2019 07:43:21 +0000
Labels:             pod-template-hash=5bf4d5689b
                    run=kubernetes-bootcamp
Annotations:        <none>
Status:             Running
IP:                 172.18.0.6
Controlled By:      ReplicaSet/kubernetes-bootcamp-5bf4d5689b
Containers:
  kubernetes-bootcamp:
    Container ID:   docker://8a6566c1233f5333585c7ca905509b754f7ac93e8b7eed4a2c0a699159486606
    Image:          jocatalin/kubernetes-bootcamp:v2
    Image ID:       docker-pullable://jocatalin/kubernetes-bootcamp@sha256:fb1a3ced00cecfc1f83f18ab5cd14199e30adc1b49aa4244f5d65ad3f5feb2a5
    Port:           8080/TCP
    Host Port:      0/TCP
    State:          Running
      Started:      Tue, 09 Apr 2019 07:43:22 +0000
    Ready:          True
    Restart Count:  0
    Environment:    <none>
    Mounts:
      /var/run/secrets/kubernetes.io/serviceaccount from default-token-6z8g2 (ro)
Conditions:
  Type              Status
  Initialized       True
  Ready             True
  ContainersReady   True
  PodScheduled      True
Volumes:
  default-token-6z8g2:
    Type:        Secret (a volume populated by a Secret)
    SecretName:  default-token-6z8g2
    Optional:    false
QoS Class:       BestEffort
Node-Selectors:  <none>
Tolerations:     node.kubernetes.io/not-ready:NoExecute for 300s
                 node.kubernetes.io/unreachable:NoExecute for 300s
Events:
  Type    Reason     Age    From               Message
  ----    ------     ----   ----               -------
  Normal  Scheduled  3m16s  default-scheduler  Successfully assigned default/kubernetes-bootcamp-5bf4d5689b-j54m4 to minikube
  Normal  Pulled     3m15s  kubelet, minikube  Container image "jocatalin/kubernetes-bootcamp:v2" already present on machine
  Normal  Created    3m15s  kubelet, minikube  Created container
  Normal  Started    3m15s  kubelet, minikube  Started container
 
 
Name:               kubernetes-bootcamp-5bf4d5689b-mrbb6
Namespace:          default
Priority:           0
PriorityClassName:  <none>
Node:               minikube/172.17.0.54
Start Time:         Tue, 09 Apr 2019 07:18:42 +0000
Labels:             pod-template-hash=5bf4d5689b
                    run=kubernetes-bootcamp
Annotations:        <none>
Status:             Running
IP:                 172.18.0.9
Controlled By:      ReplicaSet/kubernetes-bootcamp-5bf4d5689b
Containers:
  kubernetes-bootcamp:
    Container ID:   docker://49a606c599140f370953d2c5ecdfd56fe2149497635eaf650977376727fd1334
    Image:          jocatalin/kubernetes-bootcamp:v2
    Image ID:       docker-pullable://jocatalin/kubernetes-bootcamp@sha256:fb1a3ced00cecfc1f83f18ab5cd14199e30adc1b49aa4244f5d65ad3f5feb2a5
    Port:           8080/TCP
    Host Port:      0/TCP
    State:          Running
      Started:      Tue, 09 Apr 2019 07:18:43 +0000
    Ready:          True
    Restart Count:  0
    Environment:    <none>
    Mounts:
      /var/run/secrets/kubernetes.io/serviceaccount from default-token-6z8g2 (ro)
Conditions:
  Type              Status
  Initialized       True
  Ready             True
  ContainersReady   True
  PodScheduled      True
Volumes:
  default-token-6z8g2:
    Type:        Secret (a volume populated by a Secret)
    SecretName:  default-token-6z8g2
    Optional:    false
QoS Class:       BestEffort
Node-Selectors:  <none>
Tolerations:     node.kubernetes.io/not-ready:NoExecute for 300s
                 node.kubernetes.io/unreachable:NoExecute for 300s
Events:
  Type    Reason     Age   From               Message
  ----    ------     ----  ----               -------
  Normal  Scheduled  27m   default-scheduler  Successfully assigned default/kubernetes-bootcamp-5bf4d5689b-mrbb6 to minikube
  Normal  Pulled     27m   kubelet, minikube  Container image "jocatalin/kubernetes-bootcamp:v2" already present on machine
  Normal  Created    27m   kubelet, minikube  Created container
  Normal  Started    27m   kubelet, minikube  Started container
 
 
Name:               kubernetes-bootcamp-5bf4d5689b-rjpl6
Namespace:          default
Priority:           0
PriorityClassName:  <none>
Node:               minikube/172.17.0.54
Start Time:         Tue, 09 Apr 2019 07:18:43 +0000
Labels:             pod-template-hash=5bf4d5689b
                    run=kubernetes-bootcamp
Annotations:        <none>
Status:             Running
IP:                 172.18.0.10
Controlled By:      ReplicaSet/kubernetes-bootcamp-5bf4d5689b
Containers:
  kubernetes-bootcamp:
    Container ID:   docker://147bc6dec7d9e8036e4d23c0eaad891216d1c67921052c7c3ee30263c0116c55
    Image:          jocatalin/kubernetes-bootcamp:v2
    Image ID:       docker-pullable://jocatalin/kubernetes-bootcamp@sha256:fb1a3ced00cecfc1f83f18ab5cd14199e30adc1b49aa4244f5d65ad3f5feb2a5
    Port:           8080/TCP
    Host Port:      0/TCP
    State:          Running
      Started:      Tue, 09 Apr 2019 07:18:43 +0000
    Ready:          True
    Restart Count:  0
    Environment:    <none>
    Mounts:
      /var/run/secrets/kubernetes.io/serviceaccount from default-token-6z8g2 (ro)
Conditions:
  Type              Status
  Initialized       True
  Ready             True
  ContainersReady   True
  PodScheduled      True
Volumes:
  default-token-6z8g2:
    Type:        Secret (a volume populated by a Secret)
    SecretName:  default-token-6z8g2
    Optional:    false
QoS Class:       BestEffort
Node-Selectors:  <none>
Tolerations:     node.kubernetes.io/not-ready:NoExecute for 300s
                 node.kubernetes.io/unreachable:NoExecute for 300s
Events:
  Type    Reason     Age   From               Message
  ----    ------     ----  ----               -------
  Normal  Scheduled  27m   default-scheduler  Successfully assigned default/kubernetes-bootcamp-5bf4d5689b-rjpl6 to minikube
  Normal  Pulled     27m   kubelet, minikube  Container image "jocatalin/kubernetes-bootcamp:v2" already present on machine
  Normal  Created    27m   kubelet, minikube  Created container
  Normal  Started    27m   kubelet, minikube  Started container
 
 
Name:               kubernetes-bootcamp-5bf4d5689b-rq62d
Namespace:          default
Priority:           0
PriorityClassName:  <none>
Node:               minikube/172.17.0.54
Start Time:         Tue, 09 Apr 2019 07:18:42 +0000
Labels:             pod-template-hash=5bf4d5689b
                    run=kubernetes-bootcamp
Annotations:        <none>
Status:             Running
IP:                 172.18.0.8
Controlled By:      ReplicaSet/kubernetes-bootcamp-5bf4d5689b
Containers:
  kubernetes-bootcamp:
    Container ID:   docker://ba622412c3b9350df9212c3b677d1560e1b7e37cb909c262ce73153e7ff99b2c
    Image:          jocatalin/kubernetes-bootcamp:v2
    Image ID:       docker-pullable://jocatalin/kubernetes-bootcamp@sha256:fb1a3ced00cecfc1f83f18ab5cd14199e30adc1b49aa4244f5d65ad3f5feb2a5
    Port:           8080/TCP
    Host Port:      0/TCP
    State:          Running
      Started:      Tue, 09 Apr 2019 07:18:43 +0000
    Ready:          True
    Restart Count:  0
    Environment:    <none>
    Mounts:
      /var/run/secrets/kubernetes.io/serviceaccount from default-token-6z8g2 (ro)
Conditions:
  Type              Status
  Initialized       True
  Ready             True
  ContainersReady   True
  PodScheduled      True
Volumes:
  default-token-6z8g2:
    Type:        Secret (a volume populated by a Secret)
    SecretName:  default-token-6z8g2
    Optional:    false
QoS Class:       BestEffort
Node-Selectors:  <none>
Tolerations:     node.kubernetes.io/not-ready:NoExecute for 300s
                 node.kubernetes.io/unreachable:NoExecute for 300s
Events:
  Type    Reason     Age   From               Message
  ----    ------     ----  ----               -------
  Normal  Scheduled  27m   default-scheduler  Successfully assigned default/kubernetes-bootcamp-5bf4d5689b-rq62d to minikube
  Normal  Pulled     27m   kubelet, minikube  Container image "jocatalin/kubernetes-bootcamp:v2" already present on machine
  Normal  Created    27m   kubelet, minikube  Created container
  Normal  Started    27m   kubelet, minikube  Started container

我们看到部署使用的是应用程序的稳定版本(V2)。回滚是成功的。

 

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