Lighting@刘迎光

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：

[root@master-149 ~]# kubectl run my-alpine --image=alpine --replicas=2 ping www.baidu.com

查看pods状态

[root@master-149 ~]# kubectl get pods
NAME                         READY     STATUS              RESTARTS   AGE
my-alpine-2150523991-knzcx   0/1       ContainerCreating   0          6m
my-alpine-2150523991-lmvv5   0/1       ContainerCreating   0          6m

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

[root@master-149 ~]# kubectl describe pod my-alpine
Name:       my-alpine-2150523991-knzcx
Namespace:  default
Node:       node-150/192.168.10.150
Start Time: Sat, 19 Nov 2016 18:20:52 +0800
Labels:     pod-template-hash=2150523991,run=my-alpine
Status:     Pending
IP:     
Controllers:    ReplicaSet/my-alpine-2150523991
Containers:
  my-alpine:
    Container ID:   
    Image:      alpine
    Image ID:       
    Port:       
    Args:
      ping
      w

某些特殊情况下，需要将某些服务固定在一台宿主机上，K8S也适应这种方式，下面以mongo为例，来看看如何实现的：

kubectl label nodes kube-node node=kube-node
kubectl get node -a -l "node=kube-node"

pod或者rc的配置项中添加如下配置：

     nodeSelector: 
       node: kube-node4

如mongo启动的rc文件

apiVersion: v1
kind: ReplicationController
metadata:
 name: mongo
spec:
 replicas: 1 
 template:
   metadata:
     labels:
       run: mongo
   spec:
     containers:
     - name: mongo
       image: daocloud.io/library/mongo:3.2.4
       ports:
         - containerPort: 27017
       volumeMounts:
         - mountPath: /data/db
           name: mongo
     volumes: [{"name":"mongo","hostPath":{"path":"/root/volumes/mongo"}}]
     nodeSelector: 
       node: kube-node4

by 刘迎光@萤火虫工作室
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