Centos7.3 Kubernetes集群部署

下午抽空整了下Kubernetes环境，限于资源的原因，这个环境比较简单：一台master，两台node。搞起！

环境介绍及准备

物理机操作系统

物理机操作系统采用CentOS7.4 64位，细节如下。

[root@opstrip.com ~]# uname -a
Linux opstrip.com 3.10.0-693.2.2.el7.x86_64 #1 SMP Tue Sep 12 22:26:13 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
[root@opstrip.com ~]# cat /etc/redhat-release 
CentOS Linux release 7.4.1708 (Core)

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：

HostName	IP	Node/function
K8s-master	172.31.12.12	kubernetes, etcd
K8s-node1	172.31.12.13	kubernetes-node, flannel
K8s-node1	172.31.12.14	kubernetes-node, flannel

环境准备

主机名修改

Master ：

[root@ip-172-31-12-12 ~]#  hostnamectl --static set-hostname  k8s-master

Node1 :

[root@ip-172-31-12-13 ~]#  hostnamectl --static set-hostname  k8s-node1

Node2 :

[root@ip-172-31-12-14 ~]#  hostnamectl --static set-hostname  k8s-node2

安装docker及iptables

yum install docker iptables-services.x86_64 -y

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

启动docker并加入开机自启动

systemctl start docker
systemctl enable docker

K8S集群部署

MASTER

master安装kubernetes，etcd

[root@k8s-master ~]# yum install kubernetes etcd -y

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://172.31.12.12:8080"
    
# 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=172.31.12.13,172.31.12.14"  #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

slave 安装 kubernetes-node

yum install kubernetes-node.x86_64 flannel -y

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://172.31.12.12:8080"
    
# kubelet
5:KUBELET_ADDRESS="--address=0.0.0.0"
8:KUBELET_PORT="--port=10250"
11:KUBELET_HOSTNAME="--hostname-override=172.31.12.13"
14:KUBELET_API_SERVER="--api-servers=http://172.31.12.12:8080"
    
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://172.31.12.12:2379"
    
# 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" }

集群检查

[root@k8s-master ~]# kubectl get node
NAME             STATUS    AGE
172.31.12.13   Ready     56m
172.31.12.14   Ready     54m

kubernetes集群配置完成！

赏

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