怎么在centos 7系统中安装配置k8s集群

这篇文章给大家介绍怎么在centos 7系统中安装配置k8s集群，内容非常详细，感兴趣的小伙伴们可以参考借鉴，希望对大家能有所帮助。

配置背景介绍

kubernetes是google开源的容器集群管理系统，提供应用部署、维护、扩展机制等功能，利用kubernetes能方便管理跨集群运行容器化的应用，简称：k8s（k与s之间有8个字母）

实验环境

• centos7.3 64位
  

安装

yum-config-manager --add-repo https://docs.docker.com/v1.13/engine/installation/linux/repo_files/centos/docker.repo yum makecache fast yum -y install docker-engine-1.13.1 yum install epel-release -y yum remove -y docker-engine* yum install -y kubernetes etcd docker flannel

修改配置文件

注意下面的10.135.163.237换成自己服务器ip

sed -i "s/localhost:2379/10.135.163.237:2379/g" /etc/etcd/etcd.confsed -i "s/localhost:2380/10.135.163.237:2380/g" /etc/etcd/etcd.confsed -i "s/10.135.163.237:2379/10.135.163.237:2379,http:\/\/127.0.0.1:2379/g" /etc/etcd/etcd.confsed -i "s/127.0.0.1:2379/10.135.163.237:2379/g" /etc/kubernetes/apiserversed -i "s/--insecure-bind-address=127.0.0.1/--insecure-bind-address=0.0.0.0/g" /etc/kubernetes/apiserversed -i "s/--admission-control=NamespaceLifecycle,NamespaceExists,LimitRanger,SecurityContextDeny,ServiceAccount,ResourceQuota/--admission_control=NamespaceLifecycle,NamespaceExists,LimitRanger,ResourceQuota/g" /etc/kubernetes/apiserversed -i "s/--hostname-override=127.0.0.1/--hostname-override=10.135.163.237/g" /etc/kubernetes/kubeletsed -i "s/127.0.0.1:8080/10.135.163.237:8080/g" /etc/kubernetes/kubeletsed -i "s/--address=127.0.0.1/--address=0.0.0.0/g" /etc/kubernetes/kubeletsed -i "s/127.0.0.1:8080/10.135.163.237:8080/g" /etc/kubernetes/configsed -i "s/127.0.0.1:2379/10.135.163.237:2379/g" /etc/sysconfig/flanneld

修改host

vi /etc/hosts 10.135.163.237 k8s_master

添加网络

systemctl enable etcd.servicesystemctl start etcd.serviceetcdctl mk //atomic.io/network/config '{"Network":"172.17.0.0/16"}'

启动服务

service docker start for SERVICES in etcd kube-apiserver kube-controller-manager kube-scheduler kube-proxy kubelet docker flanneld ; do systemctl restart $SERVICES; systemctl enable $SERVICES; systemctl status $SERVICES; done;

第一个demo

编写文件a.yaml

apiVersion: extensions/v1beta1 kind: Deployment metadata:  name: my-appspec:  replicas: 2 template: metadata: labels: app: my-app spec: containers: - name: my-app image: registry.alauda.cn/yubang/paas_base_test ports: - containerPort: 80 command: ["/bin/bash", "/var/start.sh"]  resources:   limits:   cpu: 0.5   memory: 64Mi

编写文件b.yaml

apiVersion: v1 kind: Service metadata:  name: my-app-svc labels: app: my-appspec:  ports: - port: 80 targetPort: 80 nodePort: 30964 type: NodePort selector: app: my-app

创建服务

kubectl create -f a.yaml --validate kubectl create -f b.yaml --validate

删除服务

kubectl delete -f a.yaml kubectl delete -f b.yaml

增加子节点

安装软件

yum-config-manager --add-repo https://docs.docker.com/v1.13/engine/installation/linux/repo_files/centos/docker.repo yum makecache fast yum -y install docker-engine-1.13.1 yum install epel-release -y yum remove -y docker-engine* yum install -y kubernetes docker flannel

修改配置文件（10.135.163.237为主节点ip，139.199.0.29为当前节点ip）

sed -i "s/--hostname-override=127.0.0.1/--hostname-override=139.199.0.29/g" /etc/kubernetes/kubeletsed -i "s/127.0.0.1:8080/10.135.163.237:8080/g" /etc/kubernetes/kubeletsed -i "s/--address=127.0.0.1/--address=0.0.0.0/g" /etc/kubernetes/kubeletsed -i "s/127.0.0.1:8080/10.135.163.237:8080/g" /etc/kubernetes/configsed -i "s/127.0.0.1:2379/10.135.163.237:2379/g" /etc/sysconfig/flanneldsed -i "s/--admission-control=NamespaceLifecycle,NamespaceExists,LimitRanger,SecurityContextDeny,ServiceAccount,ResourceQuota/--admission_control=NamespaceLifecycle,NamespaceExists,LimitRanger,ResourceQuota/g" /etc/kubernetes/apiserver

启动服务

service docker startfor SERVICES in kube-proxy kubelet docker flanneld; do   systemctl restart $SERVICES  systemctl enable $SERVICES  systemctl status $SERVICES done;

在主服务器查看节点

kubectl get node

重启服务（重新加入集群）

systemctl restart kube-apiserver.service

删除节点

kubectl delete node 节点ip

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