2019-08-01 kubernetes 入门

CentOS 7

1. 安装 etcd & kubernetes

yum -y install etcd kubernetes

2.所有防火墙与 SELinux 已关闭：

systemctl stop firewalld && systemctl disable firewalld
vi /etc/sysconfig/selinux
SELINUX=disabled

3. 启动相关服务

systemctl start docker

systemctl start kube-apiserver
systemctl start kube-controller-manager
systemctl start kube-scheduler
systemctl start kubelet
systemctl start kube-proxy

4. 准备文件

mytomcat-rc.yaml

apiVersion: v1
kind: ReplicationController
metadata:
  name: mytomcat
spec:
  replicas: 2
  selector:
    app: mytomcat
  template:
    metadata:
      labels:
        app: mytomcat
    spec:
      containers:
      - name: mytomcat
        image: tomcat
        ports:
        - containerPort: 8080

mytomcat-svc.yaml

apiVersion: v1
kind: Service
metadata:
  name: mytomcat
spec:
  type: NodePort
  ports:
    - port: 8080
      nodePort: 30001
  selector:
    app: mytomcat

5. 启动

kubectl create -f mytomcat-rc.yaml
kubectl create -f mytomcat-svc.yaml

6.查看

kubectl get pods
kubectl get svc

kubectl get pods 获取不到问题解决：

vi /etc/kubernetes/spiserver
找到
KUBE_ADMISSION_CONTROL="--admission-control=NamespaceLifecycle,NamespaceExists,LimitRanger,SecurityContextDeny,ServiceAccount,ResourceQuota"
去掉 ServiceAccount 并重启 apiserver 服务
systemctl restart kube-apiserver

参考https://www.bilibili.com/video/av58290452/?p=3