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
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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
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修改host
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vi /etc/hosts
10.135.163.237 k8s_master
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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"}'
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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 ;
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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
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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
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创建服务
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kubectl create -f a.yaml --validate
kubectl create -f b.yaml --validate
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删除服务
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kubectl delete -f a.yaml
kubectl delete -f b.yaml
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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
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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
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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 ;
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在主服务器查看节点
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kubectl get node
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重启服务(重新加入集群)
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systemctl restart kube-apiserver.service
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删除节点
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kubectl delete node 节点ip
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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/
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