在centos 7中安装配置k8s集群的步骤详解

雷学国

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）

为什么要用kubernetes这么复杂的docker集群管理工具呢？一开始接触了docker内置的swarm，这个工具非常简单快捷的完成docker集群功能。但是在使用docker1.13内置的swarm做集群的时候遇到vip负载均衡没有正确映射端口到外网，或者出现地址被占用的情况，这对高可用性的需求是不利的，然而又没找到一个解决方案，只能转投k8s。

实验环境

• 腾讯云
• centos7.3 64位

安装

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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

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

修改host

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1 2	vi /etc/hosts 10.135.163.237 k8s_master

添加网络

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

启动服务

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1 2	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

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apiVersion: extensions/v1beta1 kind: Deployment metadata:  name: my-app spec:  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

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

创建服务

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1 2	kubectl create -f a.yaml --validate kubectl create -f b.yaml --validate

删除服务

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1 2	kubectl delete -f a.yaml kubectl delete -f b.yaml

增加子节点

安装软件

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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）

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

启动服务

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service docker start   for 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

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1	kubectl get node

重启服务（重新加入集群）

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1	systemctl restart kube-apiserver.service

删除节点

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1	kubectl delete node 节点ip

总结

以上就是这篇文章的全部内容了，希望本文的内容对大家的学习或者工作具有一定的参考学习价值，如果有疑问大家可以留言交流，谢谢大家对服务器之家的支持。

原文链接：http://blog.yubangweb.com/k8sshi-jian-bi-ji/