在centos 7中安装配置k8s集群的步骤详解
时间：2021-01-19 12:05:38|栏目：Linux|点击： 次
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
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.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
vi /etc/hosts 10.135.163.237 k8s_master
添加网络
systemctl enable etcd.service
systemctl start etcd.service
etcdctl 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-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
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
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/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
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
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
总结
