接下来用yaml来做
开始在子节点查看pod时一直报错
原来需要和master关联

yaml格式问题

格式1

sudo scp -r /etc/kubernetes/admin.conf ubuntu@170.106.50.78:/etc/kubernetes/admin.conf
echo “export KUBECONFIG=/etc/kubernetes/admin.conf” >> ~/.bash_profile
#source ~/.bash_profile
#source ~/.bashrc
source /etc/profile

执行kubectl create -f 报错

error: error validating "nginx-deployment.yaml": error validating data: [ValidationError(Deployment.spec.template.metadata.labels): invalid type for io.k8s.apimachinery.pkg.apis.meta.v1.ObjectMeta.labels: got "string", expected "map"

是因为我们yaml里没有写空格，没空格会成为string

app: nginx

格式2

error: error validating "nginx-deployment.yaml": error validating data: [ValidationError(Deployment.spec.template.spec.containers[1].ports): invalid type for io.k8s.api.core.v1.Container.ports: got "map", expected "array"

原因为如下，前者正确，后者错误。

ports:
- containerPort: 80
ports:
  containerPort: 80

格式3

error: error validating "nginx-deployment.yaml": error validating data: ValidationError(Deployment.spec.template.spec.containers[1]): missing required field "name" in io.k8s.api.core.v1.Container; if you choose to ignore these errors, turn validation off with --validate=false

name 和 image是同级的，我开始写错了（下图正确）

  - name: nginx
    image: nginx:1.7.9
    ports:
    - containerPort: 80

可算起来了

root@VM-0-7-ubuntu:~# kubectl get pods -l app=nginx
NAME                                READY   STATUS    RESTARTS   AGE
nginx-deployment-5d59d67564-rtjdg   1/1     Running   0          2m
nginx-deployment-5d59d67564-stt9v   1/1     Running   0          2m

这个是看系统下pod的状态。

root@VM-0-12-ubuntu:~# kubectl get pods -n kube-system
NAME                                     READY   STATUS    RESTARTS   AGE
coredns-74ff55c5b-9dq5n                  1/1     Running   0          6h28m
coredns-74ff55c5b-g44sh                  1/1     Running   0          6h28m
etcd-vm-0-12-ubuntu                      1/1     Running   0          6h28m
kube-apiserver-vm-0-12-ubuntu            1/1     Running   0          6h28m
kube-controller-manager-vm-0-12-ubuntu   1/1     Running   0          6h28m
kube-proxy-2z68q                         1/1     Running   0          6h28m
kube-proxy-brnlv                         1/1     Running   0          6h2m
kube-scheduler-vm-0-12-ubuntu            1/1     Running   0          6h28m
weave-net-7gnc5                          2/2     Running   1          6h16m
weave-net-szg6g                          2/2     Running   0          6h2m

看下pod具体信息，还有event来做debug

kubectl describe pod nginx-deployment-5d59d67564-stt9v

我尝试换了个nginx版本，在yaml里，结果貌似没这个版本，pull不到。

就是这点小心思：

root@VM-0-7-ubuntu:~# kubectl get pods -l app=nginx
NAME                                READY   STATUS         RESTARTS   AGE
nginx-deployment-5d59d67564-rtjdg   1/1     Running        0          13m
nginx-deployment-5d59d67564-stt9v   1/1     Running        0          13m
nginx-deployment-5dcb78cd58-zg8wl   0/1     ErrImagePull   0          12s
root@VM-0-7-ubuntu:~# kubectl get pods -l app=nginx
NAME                                READY   STATUS              RESTARTS   AGE
nginx-deployment-5d59d67564-rtjdg   1/1     Running             0          15m
nginx-deployment-5d59d67564-stt9v   1/1     Running             0          15m
nginx-deployment-64c9d67564-ld5bz   0/1     ContainerCreating   0          5s
root@VM-0-7-ubuntu:~# kubectl get pods -l app=nginx
NAME                                READY   STATUS              RESTARTS   AGE
nginx-deployment-5d59d67564-rtjdg   1/1     Terminating         0          15m
nginx-deployment-5d59d67564-stt9v   1/1     Running             0          15m
nginx-deployment-64c9d67564-ld5bz   1/1     Running             0          11s
nginx-deployment-64c9d67564-mtsz4   0/1     ContainerCreating   0          1s
root@VM-0-7-ubuntu:~# kubectl get pods -l app=nginx
NAME                                READY   STATUS              RESTARTS   AGE
nginx-deployment-5d59d67564-rtjdg   0/1     Terminating         0          15m
nginx-deployment-5d59d67564-stt9v   1/1     Running             0          15m
nginx-deployment-64c9d67564-ld5bz   1/1     Running             0          12s
nginx-deployment-64c9d67564-mtsz4   0/1     ContainerCreating   0          2s
root@VM-0-7-ubuntu:~# kubectl get pods -l app=nginx
NAME                                READY   STATUS              RESTARTS   AGE
nginx-deployment-5d59d67564-rtjdg   0/1     Terminating         0          15m
nginx-deployment-5d59d67564-stt9v   1/1     Running             0          15m
nginx-deployment-64c9d67564-ld5bz   1/1     Running             0          15s
nginx-deployment-64c9d67564-mtsz4   0/1     ContainerCreating   0          5s

接下来修改volumn
Pod 中的容器，使用的是 volumeMounts 字段来声明自己要挂载哪个 Volume，并通过 mountPath 字段来定义容器内的 Volume 目录，比如：/usr/share/nginx/html。
隐式 Volume, 不显式声明宿主机目录的 Volume: spec.volumes.emptyDir: {}
显示 Volume: 宿主机挂载目录
spec.volumes.hostPath.path: “/var/data”

进去看看，然后删了deployment。

kubectl exec -it nginx-deployment-748c6fff66-8nllh -- /bin/bash
kubectl delete -f nginx-deployment.yaml