Kubernetes 错误同步 pod答案

【问题标题】：Kubernetes error syncing podKubernetes 错误同步 pod
【发布时间】：2016-09-20 02:28:46
【问题描述】：

我安装了Kubernetes，但是在创建pod的时候报错了，不知道问题出在哪里，希望大家帮帮我

我用centos7，用yum安装Kubernetes。

[root@k8s-master ~]# rpm -qa |grep -i kube
kubernetes-master-1.2.0-0.11.git738b760.el7.x86_64
kubernetes-client-1.2.0-0.11.git738b760.el7.x86_64

[root@k8s-master ~]# kubectl run   my-nginx01 --image=192.168.10.58:5002/test111/nginx  --port=80
deployment "my-nginx01" created

[root@k8s-master ~]# kubectl get pods
NAME                          READY     STATUS              RESTARTS   AGE
my-nginx01-3752101197-v34jm   0/1       ContainerCreating   0          3s

[root@k8s-master ~]# kubectl describe pod my-nginx01-3752101197-v34jm

Events:
  FirstSeen LastSeen    Count   From            SubobjectPath           Type        Reason          Message
  --------- --------    -----   ----            -------------           --------    ------          -------
  22s       22s     1   {default-scheduler }                    Normal      Scheduled       Successfully assigned my-nginx01-3752101197-v34jm to 192.168.6.133
  20s       20s     1   {kubelet 192.168.6.133} spec.containers{my-nginx01} Normal      Started         Started container with docker id 3e18486078c2
  20s       20s     1   {kubelet 192.168.6.133} spec.containers{my-nginx01} Normal      Created         Created container with docker id 3e18486078c2
  21s       17s     2   {kubelet 192.168.6.133} spec.containers{my-nginx01} Normal      Pulling         pulling image "192.168.10.58:5002/test111/nginx"
  20s       16s     2   {kubelet 192.168.6.133} spec.containers{my-nginx01} Normal      Pulled          Successfully pulled image "192.168.10.58:5002/test111/nginx"
  22s       16s     3   {kubelet 192.168.6.133}                 Warning     MissingClusterDNS   kubelet does not have ClusterDNS IP configured and cannot create Pod using "ClusterFirst" policy. Falling back to DNSDefault policy.
  16s       16s     1   {kubelet 192.168.6.133} spec.containers{my-nginx01} Normal      Created         Created container with docker id 0c5c9fdd19ca
  15s       15s     1   {kubelet 192.168.6.133} spec.containers{my-nginx01} Normal      Started         Started container with docker id 0c5c9fdd19ca
  11s       11s     1   {kubelet 192.168.6.133}                 Warning     FailedSync      **Error syncing pod, skipping: failed to "StartContainer" for "my-nginx01" with CrashLoopBackOff: "Back-off 10s restarting failed container=my-nginx01 pod=my-nginx01-3752101197-v34jm_default(b4f373b3-20c3-11e6-81d6-000c294bd99a)"**

  11s   11s 1   {kubelet 192.168.6.133} spec.containers{my-nginx01} Warning BackOff Back-off restarting failed docker container

【问题讨论】：

日志说明了什么？ kubectl logs -f my-nginx01-3752101197-v34jm
CrashLoopBackoff 通常表示应用程序错误，因此您的答案就在该容器的日志中。
> 可能与 [stackoverflow.com/questions/49974003/… 重复

标签： ruby-on-rails docker debugging kubernetes warnings

【解决方案1】：

docker 容器在“启动”过程完成后立即退出的问题。添加一个永远运行的命令，它可能会起作用。比如重新创建docker镜像：

#Dockerfile
[...]
CMD exec /bin/bash -c "trap : TERM INT; sleep infinity & wait"

【讨论】：