k8s 安装

1.1 k8s的架构

除了核心组件，还有一些推荐的Add-ons：

组件名称	说明
kube-dns	负责为整个集群提供DNS服务
Ingress Controller	为服务提供外网入口
Heapster	提供资源监控
Dashboard	提供GUI
Federation	提供跨可用区的集群
Fluentd-elasticsearch	提供集群日志采集、存储与查询

1.2 修改ip地址，主机和host解析

10.0.0.11 k8s-master
10.0.0.12 k8s-node1
10.0.0.13 k8s-node2

所有界定啊需要做hosts解析

1.3 master 节点安装etcd

yum instanll etcd -y

修改配置文件
vim /etc/etcd/etcd.conf
第六行：ETCD_LISTEN_CLIENT_URLS="http://0.0.0.0:2379"
第二十一行：ETCD_ADVERTISE_CLIENT_URLS="http://10.0.0.11:2379"

启动服务
systemctl start etcd.service
systemctl enable etcd.service

测试key是否正常
生成key
etcdctl set testdir/testkey0 0
测试key，查看是否能取到值
etcdctl get testdir/testkey0

远程测试key能否取值
etcdctl -C http://10.0.0.11:2379 cluster-health

1.4 master节点安装kubernetes

yum install kubernetes-master.x86_64 -y

修改配置文件
vim /etc/kubernetes/apiserver
8行:  KUBE_API_ADDRESS="--insecure-bind-address=0.0.0.0"
11行：KUBE_API_PORT="--port=8080"
14行: KUBELET_PORT="--kubelet-port=10250"
17行：KUBE_ETCD_SERVERS="--etcd-servers=http://10.0.0.11:2379"

删除第23行的ServiceAccount
23行：KUBE_ADMISSION_CONTROL="--admission-control=NamespaceLifecycle,NamespaceExists,LimitRanger,SecurityContextDeny,ResourceQuota"

修改第二个配置文件
vim /etc/kubernetes/config

22行：KUBE_MASTER="--master=http://10.0.0.11:8080"

重启服务
systemctl enable kube-apiserver.service
systemctl restart kube-apiserver.service
systemctl enable kube-controller-manager.service
systemctl restart kube-controller-manager.service
systemctl enable kube-scheduler.service
systemctl restart kube-scheduler.service

检查服务是否安装正常

[root@k8s-master ~]# kubectl get componentstatus

NAME                 STATUS    MESSAGE             ERROR
scheduler            Healthy   ok                 
controller-manager   Healthy   ok                 
etcd-0               Healthy   {"health":"true"} 

1.5 node节点安装kubernetes

yum install kubernetes-node.x86_64 -y

编辑配置文件，让任意节点都能找到api服务
vim /etc/kubernetes/config 
22行：KUBE_MASTER="--master=http://10.0.0.11:8080"

vim /etc/kubernetes/kubelet
5行：KUBELET_ADDRESS="--address=0.0.0.0"    #修改kubelet监听地址
8行：KUBELET_PORT="--port=10250"            #监听端口
11行：KUBELET_HOSTNAME="--hostname-override=10.0.0.12"    #node节点的唯一标识
14行：KUBELET_API_SERVER="--api-servers=http://10.0.0.11:8080"    #apiserver地址

启动服务，并加入开机自启
systemctl enable docker
systemctl enable kubelet.service
systemctl restart kubelet.service
systemctl enable kube-proxy.service
systemctl restart kube-proxy.service

在master 节点检查，node节点是否启动成功

[root@k8s-master ~]# kubectl get nodes
NAME        STATUS    AGE
10.0.0.12   Ready     6m
10.0.0.13   Ready     3s

1.6 所有节点配置flannel网络

yum install flannel -y

修改配置文件,etcd地址
sed -i 's#http://127.0.0.1:2379#http://10.0.0.11:2379#g' /etc/sysconfig/flanneld

##master节点：
设定key，规划key的网段
etcdctl mk /atomic.io/network/config   '{ "Network": "172.18.0.0/16" }'

安装docker ，启动服务
yum install docker -y
systemctl enable flanneld.service 
systemctl restart flanneld.service 
systemctl  restart  docker
systemctl  enable  docker
systemctl restart kube-apiserver.service
systemctl restart kube-controller-manager.service
systemctl restart kube-scheduler.service


##node节点：
systemctl enable flanneld.service 
systemctl restart flanneld.service 
systemctl  restart  docker
systemctl restart kubelet.service
systemctl restart kube-proxy.service
vim /usr/lib/systemd/system/docker.service

#在[Service]区域下增加一行
ExecStartPost=/usr/sbin/iptables -P FORWARD ACCEPT       #使容器能和外界网络ping通

重启服务
systemctl daemon-reload 
systemctl restart docker

1.7 配置master为镜像仓库

#所有节点,配置镜像加速，以及镜像仓库地址http
vi /etc/docker/daemon.json
{
"registry-mirrors": ["https://registry.docker-cn.com"],
"insecure-registries": ["10.0.0.11:5000"]
}


##master节点
使用master节点安装镜像仓库

docker run -d -p 5000:5000 --restart=always --name registry -v /opt/myregistry:/var/lib/registry  registry

通过registry镜像生成仓库，没有镜像，默认会去官网下载，先下载registry镜像时间比较短