Centos7.3 Kubernetes集群部署
时间:2017年11月21日 浏览量:308
一、环境介绍及准备
1.1 物理机操作系统
物理机操作系统采用Centos7.3 64位，细节如下。
[root@localhost ~]# uname -a
Linux localhost.localdomain 3.10.0-514.6.1.el7.x86_64 #1 SMP Wed Jan 18 13:06:36 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
[root@localhost ~]# cat /etc/redhat-release
CentOS Linux release 7.3.1611 (Core)
1.2 主机信息
本文准备了三台机器用于部署k8s的运行环境，细节如下：
1.3 环境准备
1.3.1 主机名修改
Master：
[root@localhost ~]# hostnamectl --static set-hostname k8s-master
Node1:
[root@localhost ~]# hostnamectl --static set-hostname k8s-node1
Node2:
[root@localhost ~]# hostnamectl --static set-hostname k8s-node2
1.3.2 安装docker及iptables
yum install docker iptables-services.x86_64 -y
1.3.3 关闭默认firewalld启动iptables并清除默认规则
systemctl stop firewalld
systemctl disable firewalld
systemctl start iptables
systemctl enable iptables
iptables -F
service iptables save
1.3.4 启动docker并加入开机自启动
systemctl start docker
systemctl enable docker
二、K8S集群部署
MASTER
2.1 master安装kubernetes etcd
[root@k8s-master ~]# yum install kubernetes etcd -y
2.2 配置
etcd
#修改
[root@k8s-master ~]# cd /etc/etcd/
[root@k8s-master etcd]# vim etcd.conf
9:ETCD_LISTEN_CLIENT_URLS="http://0.0.0.0:2379"
20:ETCD_ADVERTISE_CLIENT_URLS="http://0.0.0.0:2379"
#启动并加入开机自启动
[root@k8s-master etcd]# systemctl start etcd
[root@k8s-master etcd]# systemctl enable etcd
kubernetes
#修改
[root@k8s-master ~]# cd /etc/kubernetes/
[root@k8s-master kubernetes]# ll
total 24
-rw-r--r-- 1 root root 767 Jul 3 23:33 apiserver #需要配置
-rw-r--r-- 1 root root 655 Jul 3 23:33 config #需要配置
-rw-r--r-- 1 root root 189 Jul 3 23:33 controller-manager #需要配置
-rw-r--r-- 1 root root 615 Jul 3 23:33 kubelet
-rw-r--r-- 1 root root 103 Jul 3 23:33 proxy
-rw-r--r-- 1 root root 111 Jul 3 23:33 scheduler #需要配置
#配置config
[root@k8s-master kubernetes]# vim config
22:KUBE_MASTER="--master=http://192.168.56.130:8080"
# apiserver
[root@k8s-master kubernetes]# vim apiserver
8:KUBE_API_ADDRESS="--insecure-bind-address=0.0.0.0"
11:KUBE_API_PORT="--port=8080"
14:KUBELET_PORT="--kubelet-port=10250"
17:KUBE_ETCD_SERVERS="--etcd-servers=http://127.0.0.1:2379"
23:KUBE_ADMISSION_CONTROL="--admission-control=NamespaceLifecycle,NamespaceExists,LimitRanger,ResourceQuota"
#controller-manager
[root@k8s-master kubernetes]# vim controller-manager
8:KUBELET_ADDRESSES="--machines=192.168.56.140,192.168.56.150" #增加配置
启动服务并加入开机自启动
[root@k8s-master ~]# systemctl list-unit-files |grep kube
kube-apiserver.service disabled #需要启动
kube-controller-manager.service disabled #需要启动
kube-proxy.service disabled
kube-scheduler.service disabled #需要启动
kubelet.service disabled
#启动
[root@k8s-master ~]# systemctl start kube-apiserver.service kube-controller-manager.service kube-scheduler.service
#查看是否启动
[root@k8s-master ~]# systemctl is-active kube-apiserver.service kube-controller-manager.service kube-scheduler.service
active
active
active
#开机启动
[root@k8s-master ~]# systemctl enable kube-apiserver.service kube-controller-manager.service kube-scheduler.service
注意：启动顺序 etcd-->kubernetes*
SLAVE 两个节点相同
2.3 slave 安装 kubernetes-node
yum install kubernetes-node.x86_64 flannel -y
2.4 slave配置
[root@k8s-node1 ~]# cd /etc/kubernetes/
[root@k8s-node1 kubernetes]# ll
total 12
-rw-r--r-- 1 root root 655 Jul 3 23:33 config #需要配置
-rw-r--r-- 1 root root 615 Jul 3 23:33 kubelet #需要配置
-rw-r--r-- 1 root root 103 Jul 3 23:33 proxy
#config
[root@k8s-node1 kubernetes]# vim config
22:KUBE_MASTER="--master=http://192.168.56.130:8080"
# kubelet
5:KUBELET_ADDRESS="--address=0.0.0.0"
8:KUBELET_PORT="--port=10250"
11:KUBELET_HOSTNAME="--hostname-override=192.168.56.140"
14:KUBELET_API_SERVER="--api-servers=http://192.168.56.130:8080"
启动并加入开机自启动
[root@k8s-node1 ~]# systemctl list-unit-files |grep kube
kube-proxy.service disabled
kubelet.service disabled
[root@k8s-node1 ~]# systemctl start kube-proxy.service kubelet.service
[root@k8s-node1 ~]# systemctl is-active kube-proxy.service kubelet.service
active
active
[root@k8s-node1 ~]# systemctl enable kube-proxy.service kubelet.service
#flannel配置
[root@k8s-node1 kubernetes]# cd /etc/sysconfig/
[root@k8s-node1 sysconfig]# vim flanneld
4:FLANNEL_ETCD_ENDPOINTS="http://192.168.56.130:2379"
启动并加入开机自动：
systemctl start flanneld.service
systemctl enable flanneld.service
#查看flannel状态
[root@k8s-node1 sysconfig]# systemctl is-active flanneld.service
active
注意：此时flannel启动不了，之所以启动不起来是因为etcd里面没有flannel所需要的网络信息，此时我们需要在etcd里面创建flannel所需要的网络信息
master创建 flannel所需要的网络信息：
[root@k8s-master ~]# etcdctl set /atomic.io/network/config '{ "Network": "172.17.0.0/16" }'
{ "Network": "172.17.0.0/16" }
2.5 集群检查
[root@k8s-master ~]# kubectl get node
NAME STATUS AGE
192.168.56.140 Ready 56m
192.168.56.150 Ready 54m
kubernetes集群配置完成！