安装

yum -y install etcd kubernetes

启动

按顺序启动：

etcd
docker
kube-apiserver
kube-controller-manager
kube-scheduler
kubelet
kube-proxy

配置

编写一个定义文件mysql-rc.yaml

apiVersion: v1
kind: ReplicationController
metadata:
  name: mysql
spec:
  replicas: 1
  selector: 
    app: mysql
  template:
    metadata:
      labels:
        app: mysql
    spec:
      containers:
      - name: mysql
        image: mysql
        ports:
        - containerPort: 3306
        env:
        - name: MYSQL_ROOT_PASSWORD
          value: "123456"

创建

kubectl create -f mysql-rc.yaml

查看

kubectl get rc

output

NAME      DESIRED   CURRENT   READY     AGE
mysql     1         1         0         12m

真正运行是运行在pod，所以查看是否在运行

kubectl get pods

output:

NAME          READY     STATUS              RESTARTS   AGE
mysql-mxks6   0/1       ContainerCreating   0          2m

kubectl get pods时 No resources found
解决方法：
1、$ vi /etc/kubernetes/apiserver
2、找到这一行 “KUBE_ADMISSION_CONTROL=”–admission_control=NamespaceLifecycle,NamespaceExists,LimitRanger,SecurityContextDeny,ServiceAccount,ResourceQuota"，去掉ServiceAccount，保存退出。
3、重新启动kube-apiserver服务即可

问题2：

kubectl get pod 一直处于ContainerCreating
使用kubectl describe pod podname
查看event

Events:
  FirstSeen	LastSeen	Count	From			SubObjectPath	Type		Reason		Message
  ---------	--------	-----	----			-------------	--------	------		-------
  4d		19m		1378	{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)"

  4d	16m	31066	{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\""

  16m	10m	6	{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)"

  16m	7m	38	{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\""

  6m	1m	6	{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)"

  6m	5s	26	{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\""

解决办法：

yum reinstall --downloadonly subscription-manager-rhsm-certificates
rpm2cpio /var/cache/yum/x86_64/7/updates/packages/subscription-manager-rhsm-certificates-1.21.10-3.el7.centos.x86_64.rpm | cpio -iv --to-stdout ./etc/rhsm/ca/redhat-uep.pem | tee /etc/rhsm/ca/redhat-uep.pem