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。
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| [root@opstrip.com ~]# uname -a
Linux opstrip.com 3.10.0-693.2.2.el7.x86_64
[root@opstrip.com ~]# cat /etc/redhat-release
CentOS Linux release 7.4.1708 (Core)
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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：
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| [root@ip-172-31-12-12 ~]# hostnamectl --static set-hostname k8s-master
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Node1:
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| [root@ip-172-31-12-13 ~]# hostnamectl --static set-hostname k8s-node1
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Node2:
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| [root@ip-172-31-12-14 ~]# hostnamectl --static set-hostname k8s-node2
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安装docker及iptables
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| yum install docker iptables-services.x86_64 -y
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关闭默认firewalld启动iptables并清除默认规则
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| systemctl stop firewalld
systemctl disable firewalld
systemctl start iptables
systemctl enable iptables
iptables -F
service iptables save
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启动docker并加入开机自启动
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| systemctl start docker
systemctl enable docker
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K8S集群部署
MASTER
master安装kubernetes，etcd
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| [root@k8s-master ~]# yum install kubernetes etcd -y
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配置
etcd
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[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"
[root@k8s-master etcd]# systemctl start etcd
[root@k8s-master etcd]# systemctl enable etcd
kubernetes
[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
-rw-r--r-- 1 root root 655 Jul 3 23:33 config
-rw-r--r-- 1 root root 189 Jul 3 23:33 controller-manager
-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
[root@k8s-master kubernetes]# vim config
22:KUBE_MASTER="--master=http://172.31.12.12:8080"
[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"
[root@k8s-master kubernetes]# vim controller-manager
8:KUBELET_ADDRESSES="--machines=172.31.12.13,172.31.12.14"
[root@k8s-master ~]# systemctl list-unit-files |grep kube
kube-apiserver.service disabled
kube-controller-manager.service disabled
kube-proxy.service disabled
kube-scheduler.service disabled
kubelet.service disabled
[root@k8s-master ~]# systemctl start kube-apiserver.service kube-controller-manager.service kube-scheduler.service
[root@k8s-master ~]# systemctl is-active kube-apiserver.service kube-controller-manager.service kube-scheduler.service
active
active
active
[root@k8s-master ~]# systemctl enable kube-apiserver.service kube-controller-manager.service kube-scheduler.service
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注意：启动顺序 etcd-->kubernetes*
** SLAVE 两个节点相同 **
slave 安装 kubernetes-node
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| yum install kubernetes-node.x86_64 flannel -y
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slave配置
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| [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
-rw-r--r-- 1 root root 615 Jul 3 23:33 kubelet
-rw-r--r-- 1 root root 103 Jul 3 23:33 proxy
[root@k8s-node1 kubernetes]# vim config
22:KUBE_MASTER="--master=http://172.31.12.12:8080"
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
[root@k8s-node1 kubernetes]# cd /etc/sysconfig/
[root@k8s-node1 sysconfig]# vim flanneld
4:FLANNEL_ETCD_ENDPOINTS="http://172.31.12.12:2379"
systemctl start flanneld.service
systemctl enable flanneld.service
[root@k8s-node1 sysconfig]# systemctl is-active flanneld.service
active
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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：
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| [root@k8s-master ~]# etcdctl set /atomic.io/network/config '{ "Network": "172.17.0.0/16" }'
{ "Network": "172.17.0.0/16" }
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集群检查
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| [root@k8s-master ~]# kubectl get node
NAME STATUS AGE
172.31.12.13 Ready 56m
172.31.12.14 Ready 54m
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kubernetes集群配置完成！
