使用kubernetes创建容器一直处于ContainerCreating状态的原因查找与解决

运行容器的时候，发现一直处于ContainerCreating状态，悲了个催，刚入手就遇到了点麻烦，下面来讲讲如何查找问题及解决的

运行容器命令：

[root@master- ~]# kubectl run my-alpine --image=alpine --replicas= ping www.baidu.com

查看pods状态

 [root@master- ~]# kubectl get pods
 NAME                         READY     STATUS              RESTARTS   AGE
 my-alpine--knzcx   /       ContainerCreating             6m
 my-alpine--lmvv5   /       ContainerCreating             6m

一直处于ContainerCreating状态，开始查找原因
执行如下命令：

 [root@master- ~]# kubectl describe pod my-alpine
 Name:        my-alpine--knzcx
 Namespace:    default
 Node:        node-/192.168.10.150
 Start Time:    Sat,  Nov  :: +
 Labels:        pod-template-hash=,run=my-alpine
 Status:        Pending
 IP:
 Controllers:    ReplicaSet/my-alpine-
 Containers:
   my-alpine:
     Container ID:
     Image:        alpine
     Image ID:
     Port:
     Args:
       ping
       www.baidu.com
     QoS Tier:
       cpu:        BestEffort
       memory:        BestEffort
     State:        Waiting
       Reason:        ContainerCreating
     Ready:        False
     Restart Count:
     Environment Variables:
 Conditions:
   Type        Status
   Ready     False
 No volumes.
 Events:
   FirstSeen    LastSeen    Count    From            SubobjectPath    Type        Reason        Message
   ---------    --------    -----    ----            -------------    --------    ------        -------
   7m        7m            {default-scheduler }            Normal        Scheduled    Successfully assigned my-alpine--knzcx to node-
   6m        6m            {kubelet node-}            Warning        FailedSync    Error syncing pod, skipping: failed to "StartContainer" for "POD" with ErrImagePull: "image pull failed for gcr.io/google_containers/pause:2.0, this may be because there are no credentials on this request.  details: (unable to ping registry endpoint https://gcr.io/v0/\nv2 ping attempt failed with error: Get https://gcr.io/v2/: dial tcp 64.233.189.82:443: getsockopt: connection refused\n v1 ping attempt failed with error: Get https://gcr.io/v1/_ping: dial tcp 64.233.189.82:443: getsockopt: connection refused)"

   4m    47s        {kubelet node-}        Warning    FailedSync    Error syncing pod, skipping: failed to "StartContainer" for "POD" with ErrImagePull: "image pull failed for gcr.io/google_containers/pause:2.0, this may be because there are no credentials on this request.  details: (unable to ping registry endpoint https://gcr.io/v0/\nv2 ping attempt failed with error: Get https://gcr.io/v2/: dial tcp 74.125.204.82:443: getsockopt: connection refused\n v1 ping attempt failed with error: Get https://gcr.io/v1/_ping: dial tcp 74.125.204.82:443: getsockopt: connection refused)"

   4m    8s        {kubelet node-}        Warning    FailedSync    Error syncing pod, skipping: failed to "StartContainer" for "POD" with ImagePullBackOff: "Back-off pulling image \"gcr.io/google_containers/pause:2.0\""

 Name:        my-alpine--lmvv5
 Namespace:    default
 Node:        node-/192.168.10.150
 Start Time:    Sat,  Nov  :: +
 Labels:        pod-template-hash=,run=my-alpine
 Status:        Pending
 IP:
 Controllers:    ReplicaSet/my-alpine-
 Containers:
   my-alpine:
     Container ID:
     Image:        alpine
     Image ID:
     Port:
     Args:
       ping
       www.baidu.com
     QoS Tier:
       cpu:        BestEffort
       memory:        BestEffort
     State:        Waiting
       Reason:        ContainerCreating
     Ready:        False
     Restart Count:
     Environment Variables:
 Conditions:
   Type        Status
   Ready     False
 No volumes.
 Events:
   FirstSeen    LastSeen    Count    From            SubobjectPath    Type        Reason        Message
   ---------    --------    -----    ----            -------------    --------    ------        -------
   7m        7m            {default-scheduler }            Normal        Scheduled    Successfully assigned my-alpine--lmvv5 to node-
   5m        1m            {kubelet node-}            Warning        FailedSync    Error syncing pod, skipping: failed to "StartContainer" for "POD" with ErrImagePull: "image pull failed for gcr.io/google_containers/pause:2.0, this may be because there are no credentials on this request.  details: (unable to ping registry endpoint https://gcr.io/v0/\nv2 ping attempt failed with error: Get https://gcr.io/v2/: dial tcp 74.125.204.82:443: getsockopt: connection refused\n v1 ping attempt failed with error: Get https://gcr.io/v1/_ping: dial tcp 74.125.204.82:443: getsockopt: connection refused)"

   3m    1m        {kubelet node-}        Warning    FailedSync    Error syncing pod, skipping: failed to "StartContainer" for "POD" with ImagePullBackOff: "Back-off pulling image \"gcr.io/google_containers/pause:2.0\""
 其中：

 Error syncing pod, skipping: failed to "StartContainer" for "POD" with ErrImagePull: "image pull failed for gcr.io/google_containers/pause:2.0, this may be because there are no credentials on this request.  details: (unable to ping registry endpoint https://gcr.io/v0/\nv2 ping attempt failed with error: Get https://gcr.io/v2/: dial tcp 74.125.204.82:443: getsockopt: connection refused\n v1 ping attempt failed with error: Get https://gcr.io/v1/_ping: dial tcp 74.125.204.82:443: getsockopt: connection refused)

不难看出，无法访问到gcr.io
有如下解决办法：

1. 翻墙
2. 修改hosts文件（这里我用的是“61.91.161.217  gcr.io”，但是可能会失效）
3. 从其他源下载容器“pause:2.0”，然后打tag为“gcr.io/google_containers/pause:2.0”