在centos 7中安装配置k8s集群的步骤详解

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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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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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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kubectl create -f a.yaml --validate

kubectl create -f b.yaml --validate

删除服务

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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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kubectl get node

重启服务(重新加入集群)

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systemctl restart kube-apiserver.service

删除节点

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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/

本文链接:https://my.lmcjl.com/post/18758.html

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