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这篇文章给大家介绍CentOS7中怎么搭建kubernetes集群环境,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。
一、服务器环境准备
192.168.247.128 : k8s-master、etcd、registry
192.168.247.129 : k8s-nodeA
192.168.247.130 : k8s-nodeB
注:安装lsb_release命令:yum install redhat-lsb -y
三台机器配置相同
安装好相同版本的docker:
[root@localhost ~]# docker -v
Docker version 1.12.6, build 85d7426/1.12.6
三台机器上分别修改hostname:
master上运行:
[root@localhost ~]# hostnamectl --static set-hostname k8s-master
nodeA上运行:
[root@localhost ~]# hostnamectl --static set-hostname k8s-nodeA
nodeB上运行:
[root@localhost ~]# hostnamectl --static set-hostname k8s-nodeB
三台机器上分别配置hosts, 执行如下命令修改hosts文件:
echo '192.168.247.128 k8s-master 192.168.247.128 etcd 192.168.247.128 registry 192.168.247.129 k8s-nodeA 192.168.247.130 k8s-nodeB' >> /etc/hosts
关闭三台机器的防火墙, 三台机器上分别执行:
[root@localhost ~]# systemctl stop firewalld
注:防火墙相关命令:
查看防火墙状态: systemctl status firewalld
关闭防火墙:systemctl stop firewalld
开启防火墙:systemctl start firewalld
关闭前:
关闭后:
二、安装etcd
k8s运行依赖etcd,需要先安装etcd, yum方式安装etcd:
在k8s-master上运行:
yum install etcd -y
安装完成后编辑配置文件 , yum安装的etcd默认配置文件在/etc/etcd/etcd.conf
修改如下三个参数值:
执行如下命令,启动etcd, 并验证状态是否正确 :
[root@localhost ~]# systemctl start etcd
[root@localhost ~]# etcdctl set developer xiejunbo
xiejunbo
[root@localhost ~]# etcdctl get developer
xiejunbo
[root@localhost ~]# etcdctl -C http://etcd:4001 cluster-health
member 8e9e05c52164694d is healthy: got healthy result from http://etcd:2379
cluster is healthy
[root@localhost ~]# etcdctl -C http://etcd:2379 cluster-health
member 8e9e05c52164694d is healthy: got healthy result from http://etcd:2379
cluster is healthy
说明ectd状态健康,可以正常使用。
三、部署k8s-master
安装docker:
yum install docker
修改docker配置文件:vi /etc/sysconfig/docker
设置docker开机自启动,然后开启docker服务:
[root@localhost ~]# chkconfig docker on
[root@localhost ~]# service docker start
安装kubernetes :
使用yum方式安装kubernetes: yum install kubernetes
kubernetes安装成功后, 配置并启动kubernetes :
在kubernetes master 上运行需要以下组件:
1.kubernetes api server
2.kubernetes controller manager
3.kubernetes scheduler
需要修改相对应的配置文件 :
/etc/kubernetes/apiserver: 修改四个参数:
/etc/kubernetes/config: 修改一个参数:
修改完成后,启动服务,然后设置开机自启动:
[root@localhost ~]# systemctl enable kube-apiserver.service
Created symlink from /etc/systemd/system/multi-user.target.wants/kube-apiserver.service to /usr/lib/systemd/system/kube-apiserver.service.
[root@localhost ~]# systemctl start kube-apiserver.service
[root@localhost ~]# systemctl enable kube-controller-manager.service
Created symlink from /etc/systemd/system/multi-user.target.wants/kube-controller-manager.service to /usr/lib/systemd/system/kube-controller-manager.service.
[root@localhost ~]# systemctl start kube-controller-manager.service
[root@localhost ~]# systemctl enable kube-scheduler.service
Created symlink from /etc/systemd/system/multi-user.target.wants/kube-scheduler.service to /usr/lib/systemd/system/kube-scheduler.service.
[root@localhost ~]# systemctl start kube-scheduler.service
四、部署k8s-node
1.安装docker略
2.nodeA节点安装kubernetes: yum install kubernetes
配置并启动kubernetes:
在k8s-node上需要运行以下组件:
1.kubelet
2.kubernetes proxy
需要对应修改两个配置文件 :
修改/etc/kubernetes/config中的kube_master地址参数:
修改/etc/kubernetes/kubelet中的三个参数:
修改完成后,启动服务并设置开机自动启动:
[root@localhost ~]# systemctl enable kubelet.service
Created symlink from /etc/systemd/system/multi-user.target.wants/kubelet.service to /usr/lib/systemd/system/kubelet.service.
[root@localhost ~]# systemctl start kubelet.service
[root@localhost ~]# systemctl enable kube-proxy.service
Created symlink from /etc/systemd/system/multi-user.target.wants/kube-proxy.service to /usr/lib/systemd/system/kube-proxy.service.
[root@localhost ~]# systemctl start kube-proxy.service
节点启动后,在master上查看状态是否正常:
[root@localhost ~]# kubectl -s http://k8s-master:8080 get node
NAME STATUS AGE
k8s-nodea Ready 2m
[root@localhost ~]# kubectl get nodes
NAME STATUS AGE
k8s-nodea Ready 7m
在节点k8s-nodeB上按nodeA操作,同样安装kubernetes:
安装kubernetes 成功后, 按k8s-nodeA修改配置:
修改完配置后,启动服务并设置开机自启动:
[root@localhost ~]# systemctl enable kubelet.service
Created symlink from /etc/systemd/system/multi-user.target.wants/kubelet.service to /usr/lib/systemd/system/kubelet.service.
[root@localhost ~]# systemctl start kubelet.service
[root@localhost ~]# systemctl enable kube-proxy.service
Created symlink from /etc/systemd/system/multi-user.target.wants/kube-proxy.service to /usr/lib/systemd/system/kube-proxy.service.
[root@localhost ~]# systemctl start kube-proxy.service
在master上查看集群中节点及节点状态:
五、创建Flannel网络
在k8s-master、k8s-nodeA、k8s-nodeB上均安装Flannel, 执行命令:
yum install flannel
安装成功后,k8s-master、k8s-nodeA、k8s-nodeB上均修改配置文件为 :/etc/sysconfig/flanneld
k8s-master中配置etcd中关于flannel的key:
[root@localhost ~]# etcdctl mk /atomic.io/network/config '{"Network":"192.0.0.0/16"}'
{"Network":"192.0.0.0/16"}
特别注意:Flannel使用Etcd进行配置,来保证多个Flannel实例之间的配置一致性,所以需要在etcd上进行如下配置:(‘/atomic.io/network/config’这个key与上文/etc/sysconfig/flannel中的配置项FLANNEL_ETCD_PREFIX是相对应的,错误的话启动就会出错)
启动Flannel之后,需要依次重启docker、kubernete:
在master执行:
systemctl enable flanneld.service systemctl start flanneld.service service docker restart systemctl restart kube-apiserver.service systemctl restart kube-controller-manager.service systemctl restart kube-scheduler.service
在node上执行:
systemctl enable flanneld.service systemctl start flanneld.service service docker restart systemctl restart kubelet.service systemctl restart kube-proxy.service
安装配置完成
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检查K8S版本:
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