kubernetes创建yaml，pod服务一直处于 ContainerCreating状态的原因查找与解决

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本文记录了使用Kubernetes创建容器时遇到的ContainerCreating状态问题及其解决过程。通过查看日志定位到镜像拉取失败的原因，并通过安装相关组件解决了问题。

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最近刚刚入手研究kubernetes，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：

kubectl -f create redis.yaml

kubectl get pod redis

NAME READY STATUS RESTARTS AGE
redis-master-6jgsl 0/1 ContainerCreating 0 12s

一直处于ContainerCreating，没有处于running状态

查看相关日志

kubectl describe pod redis-6jgsl

Name:       redis-master-6jgsl
Namespace:   default
Node:       127.0.0.1/127.0.0.1
Start Time:   Wed, 20 Sep 2017 09:07:39 +0800
Labels:       name=redis-master
Status:       Pending
IP:
Controllers:   ReplicationController/redis-master
Containers:
master:
    Container ID:
    Image:           kubeguide/redis-master
    Image ID:
    Port:           6379/TCP
    State:           Waiting
      Reason:           ContainerCreating
    Ready:           False
    Restart Count:       0
    Volume Mounts:       <none>
    Environment Variables:   <none>
Conditions:
Type       Status
Initialized    True
Ready    False
PodScheduled    True
No volumes.
QoS Class:   BestEffort
Tolerations:   <none>
Events:
FirstSeen   LastSeen   Count   From           SubObjectPath   Type       Reason       Message
---------   --------   -----   ----           -------------   --------   ------       -------
1m       1m       1   {default-scheduler }           Normal       Scheduled   Successfully assigned redis-master-6jgsl to 127.0.0.1
1m       47s       3   {kubelet 127.0.0.1}           Warning       FailedSync   Error syncing pod, skipping: failed to "StartContainer" for "POD" with ErrImagePull: "image pull failed for registry.access.redhat.com/rhel7/pod-infrastructure:latest, this may be because there are no credentials on this request. details: (open /etc/docker/certs.d/registry.access.redhat.com/redhat-ca.crt: no such file or directory)"

1m   10s   4   {kubelet 127.0.0.1}       Warning   FailedSync   Error syncing pod, skipping: failed to "StartContainer" for "POD" with ImagePullBackOff: "Back-off pulling image \"registry.access.redhat.com/rhel7/pod-infrastructure:latest\""

看到registry.access.redhat.com/rhel7/pod-infrastructure:latest感觉很奇怪，我设置的仓库是grc.io，为什么去拉取这个镜像，怀疑是不是什么没有安装好。尝试运行docker pull registry.access.redhat.com/rhel7/pod-infrastructure:latest，提示redhat-ca.crt: no such file or directory。ls查看改文件是个软连接，链接目标是/etc/rhsm，查看没有rhsm，尝试安装yum install *rhsm*，出现相关软件，感觉比较符合，所以安装查看产生了/etc/rhsm文件夹。

再次运行kubectl get pods

NAME READY STATUS RESTARTS AGE
redis-master-qhd12 1/1 Running 0 13m