1. k8s集群的安装
目录
Kubernetes借鉴了Borg的设计理念，比如Pod、Service、Labels和单Pod单IP等。Kubernetes的整体架构跟Borg非常像，如下图所示：
1、架构:
除了核心组件，还有一些推荐的Add-ons：
2、环境准备
3台主机,IP地址、主机名的host解析分别如下(最好再做一下SSH免秘钥的登录,实验环境方便操作!)
10.0.0.11 k8s-master
10.0.0.12 k8s-node-1
10.0.0.13 k8s-node-2
3、master节点安装etcd
1. 安装 etcd
yum install etcd -y
2. 编辑配置文件
6行：ETCD_LISTEN_CLIENT_URLS="http://0.0.0.0:2379"
21行：ETCD_ADVERTISE_CLIENT_URLS="http://10.0.0.11:2379"
3. 启动并自启服务
systemctl start etcd.service
systemctl enable etcd.service
----------------------------------------------------------
etcdctl set testdir/testkey0 0
etcdctl get testdir/testkey0
etcdctl -C http://10.0.0.11:2379 cluster-health
注: etcd原生支持做集群，etcd服务可以安装在其他服务器做成etcd集群,通过kubernets连接
4、 master节点安装kubernetes
1. 安装kubernetes
yum install kubernetes-master.x86_64 -y
2. 编辑配置
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"
23行：KUBE_ADMISSION_CONTROL="--admission-control=NamespaceLifecycle,NamespaceExists,LimitRanger,SecurityContextDeny,ResourceQuota"
vim /etc/kubernetes/config
22行：KUBE_MASTER="--master=http://10.0.0.11:8080"
3. 重启并自启k8s
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"}
5、node节点安装kubernetes
#1. 安装kubernetes-node
yum install kubernetes-node.x86_64 -y
#2. 编辑配置
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"
8行：KUBELET_PORT="--port=10250"
11行：KUBELET_HOSTNAME="--hostname-override=10.0.0.12"
14行：KUBELET_API_SERVER="--api-servers=http://10.0.0.11:8080"
#3. 启动并自启服务
systemctl enable kubelet.service
systemctl restart kubelet.service
systemctl enable kube-proxy.service
systemctl restart kube-proxy.service
systemctl enable docker
在master节点检查验证:
[root@k8s-master /etc/kubernetes ]#: kubectl get nodes
NAME STATUS AGE
10.0.0.12 Ready 2m
10.0.0.13 Ready 5s
6、所有节点配置flannel网络
flannel和overlay网络类似需要数据库,flannel需要etcd数据库
yum install flannel -y
sed -i 's#http://127.0.0.1:2379#http://10.0.0.11:2379#g' /etc/sysconfig/flanneld
##master节点：
etcdctl mk /atomic.io/network/config '{ "Network": "172.18.0.0/16","Backend": {"Type": "vxlan"} }'
#所有节点执行
systemctl enable flanneld.service
systemctl restart flanneld.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
systemctl daemon-reload
systemctl restart docker
systemd中有这样功能的配置:
1) ExexStart
2) ExexStartPost
最后在master节点验证结果如下:
7、配置master为镜像仓库
#所有节点执行
##1. 配置镜像加速
vi /etc/docker/daemon.json
{
"registry-mirrors": ["https://registry.docker-cn.com"],
"insecure-registries": ["10.0.0.11:5000"]
}
##2. 重载docker
systemctl restart docker
#master节点
yum install docker -y
systemctl enable docker
systemctl start docker
docker run -d -p 5000:5000 --restart=always --name registry -v /opt/myregistry:/var/lib/registry registry