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文章目录

一、单master节点用二进制部署K8S集群

1、拓扑图与主机分配

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（1）拓扑图介绍

master组件介绍：

kube-apiserver：是集群的统一入口，各个组件的协调者，所有对象资源的增删改查和监听操作都交给APIserver处理，再提交给etcd存储。

kube-controller-manager：处理群集中常规的后台任务，一个资源对应一个控制器，而controller-manager就是负责管理这些控制器。

kube-scheduler：根据调度算法为新创建的pod选择一个node节点，可以任意部署，可以部署同一个节点上，也可以部署在不同节点上

node组件介绍：

kubelet：kube是master在node节点上的Agent，管理本机运行容器的生命周期，比如创建容器、Pod挂载数据卷、下载secret、获取容器和节点状态等工作。kubelet将每个pod转换成一组容器

kube-proxy：在node节点上实现pod网络代理，维护网络规划和四层负载均衡的工作

docker：Docker引擎

flannel：flannel网络

etcd集群介绍：etcd集群在这里分布的部署到了三个节点上

etcd是CoreOS团队于2013年6月发起的开源项目，基于go语言开发，目标是构建一个高可用的分布式键值（key-value）数据库。etcd内部采用raft协议作为一致性算法。

etcd集群数据无中心化集群，有如下特点：

1、简单：安装配置简单，而且提供了HTTP进行交互，使用也很简单

2、安全：支持SSL证书验证

3、快速：根据官方提供的benchmark数据，单实例支持每秒2k+读操作

4、可靠：采用raft算法，实现分布式数据的可用性和一致性

（2）证书规划

部署K8S集群中会用到的自签SSL证书
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二、具体配置

1、实验环境

centos7
k8s1.18

2、环境准备

首先设置防火墙，核心防护

[root@master ~]# setenforce 0
setenforce: SELinux is disabled
[root@master ~]# iptables -F

官网下载软件地址

https://github.com/kubernetes/kubernetes/releases?after=v1.13.1

3、ETCD集群部署

1、master主机创建k8s文件夹并上传etcd脚本，下载cffssl官方证书生成工具

[root@master ~]# mkdir -p k8s/etcd-cert
[root@master ~]# cd k8s/
[root@master k8s]# rz -E	'//上传etcd脚本'
rz waiting to receive.
[root@master k8s]# ls
etcd-cert  etcd-cert.sh  etcd.sh
[root@master k8s]# mv etcd-cert.sh etcd-cert	'//移动到相应目录'
[root@master k8s]# vim cfssl.sh
curl -L https://pkg.cfssl.org/R1.2/cfssl_linux-amd64 -o /usr/local/bin/cfssl
curl -L https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64 -o /usr/local/bin/cfssljson
curl -L https://pkg.cfssl.org/R1.2/cfssl-certinfo_linux-amd64 -o /usr/local/bin/cfssl-certinfo
chmod +x /usr/local/bin/cfssl /usr/local/bin/cfssljson /usr/local/bin/cfssl-certinfo
[root@master k8s]# bash cfssl.sh	'//运行下载工具的脚本'
[root@master k8s]# ls /usr/local/bin/
cfssl  cfssl-certinfo  cfssljson	'//cfssl：生成证书工具、cfssljson：通过传入json文件生成证书、cfssl-certinfo查看证书信息'

2、创建证书

[root@master k8s]# cd etcd-cert/
[root@master etcd-cert]# ls
etcd-cert.sh
[root@master etcd-cert]# vim etcd-cert.sh 
[root@master etcd-cert]# cat > ca-config.json <<EOF	'//定义ca证书配置文件'
> {
>   "signing": {
>     "default": {
>       "expiry": "87600h"	'//有效期10年'
>     },
>     "profiles": {
>       "www": {
>          "expiry": "87600h",
>          "usages": [
>             "signing",
>             "key encipherment",
>             "server auth",
>             "client auth"
>         ]
>       }
>     }
>   }
> }
> EOF
[root@master etcd-cert]# ls
ca-config.json  etcd-cert.sh
[root@master etcd-cert]# cat > ca-csr.json <<EOF	'//实现证书签名'
> {
>     "CN": "etcd CA",
>     "key": {
>         "algo": "rsa",
>         "size": 2048
>     },
>     "names": [
>         {
>             "C": "CN",
>             "L": "Beijing",
>             "ST": "Beijing"
>         }
>     ]
> }
> EOF
[root@master etcd-cert]# ls
ca-config.json  ca-csr.json  etcd-cert.sh
[root@master etcd-cert]# cfssl gencert -initca ca-csr.json | cfssljson -bare ca -	'//生成证书：ca-key.pem、ca.pem'
2020/04/28 17:20:04 [INFO] generating a new CA key and certificate from CSR
2020/04/28 17:20:04 [INFO] generate received request
2020/04/28 17:20:04 [INFO] received CSR
2020/04/28 17:20:04 [INFO] generating key: rsa-2048
2020/04/28 17:20:04 [INFO] encoded CSR
2020/04/28 17:20:04 [INFO] signed certificate with serial number 627688569501939751033650268553951663355426596234
[root@master etcd-cert]# ls
ca-config.json  ca.csr  ca-csr.json  ca-key.pem  ca.pem  etcd-cert.sh

3、指定etcd三个节点之间的通信验证

[root@master etcd-cert]# cat > server-csr.json <<EOF	'//配置服务器端的签名文件'
> {
>     "CN": "etcd",
>     "hosts": [
>     "192.168.233.131",
>     "192.168.233.132",
>     "192.168.233.133"
>     ],
>     "key": {
>         "algo": "rsa",
>         "size": 2048
>     },
>     "names": [
>         {
>             "C": "CN",
>             "L": "BeiJing",
>             "ST": "BeiJing"
>         }
>     ]
> }
> EOF
[root@master etcd-cert]# ls
ca-config.json  ca.csr  ca-csr.json  ca-key.pem  ca.pem  etcd-cert.sh  server-csr.json
[root@master etcd-cert]# cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=www server-csr.json | cfssljson -bare server	'//服务器端使用签名文件生成ETCD证书，生成server-key.pem和server.pem证书'
2020/04/28 17:26:08 [INFO] generate received request
2020/04/28 17:26:08 [INFO] received CSR
2020/04/28 17:26:08 [INFO] generating key: rsa-2048
2020/04/28 17:26:08 [INFO] encoded CSR
2020/04/28 17:26:08 [INFO] signed certificate with serial number 104231949478288171020459643652243317335608475999
2020/04/28 17:26:08 [WARNING] This certificate lacks a "hosts" field. This makes it unsuitable for
websites. For more information see the Baseline Requirements for the Issuance and Management
of Publicly-Trusted Certificates, v.1.1.6, from the CA/Browser Forum (https://cabforum.org);
specifically, section 10.2.3 ("Information Requirements").
[root@master etcd-cert]# ls
ca-config.json  ca-csr.json  ca.pem        server.csr       server-key.pem
ca.csr          ca-key.pem   etcd-cert.sh  server-csr.json  server.pem

4、下载并解压ETCD二进制包，下载地址：https://github.com/etcd-io/etcd/releases

[root@master etcd-cert]# cd ..
[root@master k8s]# rz -E	'//我已经下载好了，直接上传，还有flannel和kubernetes-server的软件也一起上传'
rz waiting to receive.
[root@master k8s]# ls
cfssl.sh   etcd.sh                          flannel-v0.10.0-linux-amd64.tar.gz
etcd-cert  etcd-v3.3.10-linux-amd64.tar.gz  kubernetes-server-linux-amd64.tar.gz
[root@master k8s]# tar zxvf etcd-v3.3.10-linux-amd64.tar.gz 	'//解压软件'

5、创建命令，配置文件和证书的文件夹，并移动相应文件到相应目录

[root@master k8s]# mkdir -p /opt/etcd/{cfg,bin,ssl}
[root@master k8s]# ls /opt/etcd/
bin  cfg  ssl
[root@master k8s]# ls etcd-v3.3.10-linux-amd64
Documentation  etcd  etcdctl  README-etcdctl.md  README.md  READMEv2-etcdctl.md
[root@master k8s]# mv etcd-v3.3.10-linux-amd64/etcd* /opt/etcd/bin	'//移动命令到刚刚创建的 bin目录'
[root@master k8s]# ls /opt/etcd/bin/
etcd  etcdctl
[root@master k8s]# cp etcd-cert/*.pem /opt/etcd/ssl	'//将证书文件复制到刚刚创建的ssl目录'
[root@master k8s]# ls /opt/etcd/ssl
ca-key.pem  ca.pem  server-key.pem  server.pem
[root@master k8s]# vim etcd.sh	'//查看配置文件'
    ...省略内容
ETCD_LISTEN_PEER_URLS="https://${ETCD_IP}:2380"		'//2380端口是etcd内部通信端口'
ETCD_LISTEN_CLIENT_URLS="https://${ETCD_IP}:2379"	'//2379是单个etcd对外提供的端口'
 ...省略内容

6、主节点执行脚本并声明本地节点名称和地址，此时会进入监控状态，等待其他节点加入，等待时间2分钟

[root@master k8s]# ls /opt/etcd/cfg/	'//此时查看这个目录是没有文件的'
[root@master k8s]# bash etcd.sh etcd01 192.168.233.131 etcd02=https://192.168.233.132:2380,etcd03=https://192.168.233.133:2380	'//执行命令进入监控状态'
Created symlink from /etc/systemd/system/multi-user.target.wants/etcd.service to /usr/lib/systemd/system/etcd.service.
[root@master k8s]# ls /opt/etcd/cfg/	'//此时重新打开终端，发现已经生成了文件'
etcd

7、拷贝证书和启动脚本到两个工作节点

[root@master k8s]# scp -r /opt/etcd/ root@192.168.233.132:/opt
[root@master k8s]# scp -r /opt/etcd/ root@192.168.233.133:/opt
[root@master k8s]# scp /usr/lib/systemd/system/etcd.service root@192.168.233.132:/usr/lib/systemd/system
[root@master k8s]# scp /usr/lib/systemd/system/etcd.service root@192.168.233.133:/usr/lib/systemd/system

node01和node02两个工作节点修改修改etcd配置文件，修改相应的名称和IP地址

[root@node01 ~]# vim /opt/etcd/cfg/etcd	'//两个节点相同方法修改，此处指展示node01的修改'

先开启主节点的集群脚本，然后两个节点启动etcd

[root@master k8s]# bash etcd.sh etcd01 192.168.233.131 etcd02=https://192.168.233.132:2380,etcd03=https://192.168.233.133:2380	'//master节点开启集群脚本'
[root@node01 ~]# systemctl start etcd	'//然后两个节点启动etcd'
[root@node01 ~]# systemctl status etcd
[root@node02 ~]# systemctl starts etcd
[root@node02 ~]# systemctl status etcd

检查集群状态：注意相对路径

[root@master k8s]# cd /opt/etcd/ssl/
[root@master ssl]# ls
ca-key.pem  ca.pem  server-key.pem  server.pem
[root@master ssl]# /opt/etcd/bin/etcdctl --ca-file=ca.pem --cert-file=server.pem --key-file=server-key.pem --endpoints="https://192.168.233.131:2379,https://192.168.233.132:2379,https://192.168.233.133:2379" cluster-health
member a577d40b7d081aae is healthy: got healthy result from https://192.168.233.132:2379
member b5d01bc42d3df1bf is healthy: got healthy result from https://192.168.233.133:2379
member bd998b98e5e1b417 is healthy: got healthy result from https://192.168.233.131:2379
cluster is healthy	'//集群是健康的，没问题'

4、部署Docker

两个node节点部署Docker，不在赘述，如有疑问，可参阅我之前的博客：

5、flannel容器集群网络部署

flannel网络理论介绍
Overlay Network：覆盖网络，在基础网络上叠加的一种虚拟化网络技术模式，该网络中的主机通过虚拟链路连接起来
VXLAN：将源数据包封装到UDP中，并使用基础网络的IP/MAC作为外层报文头进行封装，然后在以太网上进行传输，到达目的地后由隧道端点解封装并将数据发送给目标地址
Flannel：是Overlay网络的一种，也是将源数据包封装在另一种网络包里面进行路由转发和通信，目前已经支持UDP、VXLAN、AWS VPC和GCE路由等数据转发方式
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Flannel是CoreOS团队针对 Kubernetes设计的一个网络规划服务，简单来说，它的功能是让集群中的不同节点主机创建的 Docker容器都具有全集群唯一的虚拟IP地址。而且它还能在这些IP地址之间建立一个覆盖网络（overlay Network），通过这个覆盖网络，将数据包原封不动地传递到目标容器内
ETCD在这里的作用：为Flannel提供说明
存储管理 Flannel可分配的IP地址段资源
监控ETCD中每个Pod的实际地址，并在内存中建立维护Pod节点路由表

部署flannel（两个node）
1、master节点写入分配的子网段到ETCD中，供flannel使用

[root@master ssl]# /opt/etcd/bin/etcdctl --ca-file=ca.pem --cert-file=server.pem --key-file=server-key.pem 
--endpoints="https://192.168.233.131:2379,https://192.168.233.132:2379,https://192.168.233.133:2379" set /coreos.com/network/config '{"Network": "172.17.0.0/16","Backend":{"Type":"vxlan"}}'	'//写入分配的网段'
{"Network": "172.17.0.0/16","Backend":{"Type":"vxlan"}}
[root@master ssl]# /opt/etcd/bin/etcdctl --ca-file=ca.pem --cert-file=server.pem --key-file=server-key.pem --endpoints="https://192.168.233.131:2379,https://192.168.233.132:2379,https://192.168.233.133:2379" get /coreos.com/network/config 	'//查看写入的网段'
{"Network": "172.17.0.0/16","Backend":{"Type":"vxlan"}}

2、在两个node节点部署flannel

[root@master ssl]# cd /root/k8s/
[root@master k8s]# scp flannel-v0.10.0-linux-amd64.tar.gz root@192.168.233.132:/opt
[root@master k8s]# scp flannel-v0.10.0-linux-amd64.tar.gz root@192.168.233.133:/opt
[root@node01 ~]# cd /opt
[root@node01 opt]# ls
containerd  etcd  flannel-v0.10.0-linux-amd64.tar.gz
[root@node01 opt]# tar zxvf flannel-v0.10.0-linux-amd64.tar.gz 	'//node02也要解压，不在赘述'
flanneld
mk-docker-opts.sh
README.md
'//谁需要跑pod，谁就需要安装flannel网络'

3、node节点创建k8s工作目录，将两个脚本移动到对应工作目录

[root@node01 opt]# mkdir -p /opt/k8s/{cfg,bin,ssl}	'//创建对应配置文件，命令和证书目录'
[root@node01 opt]# mv mk-docker-opts.sh flanneld ./k8s/bin/	'//移动flannel脚本命令到相应目录'
[root@node01 opt]# ls k8s/bin/
mk-docker-opts.sh

4、两个node节点都编辑flannel.sh脚本：创建配置文件与启动脚本，定义的端口是2379，节点对外提供的端口

[root@node01 opt]# vim flannel.sh
#!/bin/bash

ETCD_ENDPOINTS=${1:-"http://127.0.0.1:2379"}

cat <<EOF >/opt/k8s/cfg/flanneld
FLANNEL_OPTIONS="--etcd-endpoints=${ETCD_ENDPOINTS} \
-etcd-cafile=/opt/etcd/ssl/ca.pem \
-etcd-certfile=/opt/etcd/ssl/server.pem \
-etcd-keyfile=/opt/etcd/ssl/server-key.pem \"

EOF

cat <<EOF >/usr/lib/systemd/system/flanneld.service
[Unit]
Description=Flanneld overlay address etcd agent
After=network.target
After=network-online.target
Before=docker.service

[Service]
Type=notify
EnvironmentFile=/opt/k8s/cfg/flanneld
ExecStart=/opt/k8s/bin/flanneld --ip-masq \$FLANNEL_OPTIONS
ExecStartPost=/opt/k8s/bin/mk-docker-opts.sh -k DOCKER_NETWORK_OPTIONS -d /run/flannel/subnet.env
Restart=on-failure

[Install]
WantedBy=multi-user.target

EOF

systemctl daemon-reload
systemctl enable flanneld
systemctl restart flanneld

5、执行脚本，开启flannel网络功能

[root@node01 opt]# bash flannel.sh https://192.168.233.131:2379,https://192.168.233.132：2379,https://192.168.233.133:2379	'//两个node节点都开启'
Created symlink from /etc/systemd/system/multi-user.target.wants/flanneld.service to /usr/lib/systemd/system/flanneld.service.
[root@node02 opt]# systemctl status flanneld	'//查看flanneld服务是否正常开启'

6、配置docker连接flannel网络

[root@node01 opt]# vim /usr/lib/systemd/system/docker.service
EnvironmentFile=/run/flannel/subnet.env
ExecStart=/usr/bin/dockerd -H fd:// $DOCKER_NETWORK_OPTIONS --containerd=/run/containerd/containerd.sock
ExecReload=/bin/kill -s HUP $MAINPID

7、查看flannel分配给docker的IP地址

[root@node01 opt]# cat /run/flannel/subnet.env	'//node01节点分配的地址'
DOCKER_OPT_BIP="--bip=172.17.26.1/24"
DOCKER_OPT_IPMASQ="--ip-masq=false"
DOCKER_OPT_MTU="--mtu=1450"
DOCKER_NETWORK_OPTIONS=" --bip=172.17.26.1/24 --ip-masq=false --mtu=1450"	'//bip指定启动时的子网'
[root@node02 opt]# cat /run/flannel/subnet.env	'//node02节点分配的地址'
DOCKER_OPT_BIP="--bip=172.17.4.1/24"
DOCKER_OPT_IPMASQ="--ip-masq=false"
DOCKER_OPT_MTU="--mtu=1450"
DOCKER_NETWORK_OPTIONS=" --bip=172.17.4.1/24 --ip-masq=false --mtu=1450"

8、重启Docker服务，再次查看flannel网络是否有变化

[root@node02 opt]# systemctl daemon-reload
[root@node02 opt]# systemctl restart docker
[root@node02 opt]# ip addr	'//两个节点应该能查看到各自对应的flannel网络的网段'

9、创建容器测试两个node节点是否可以互联互通

[root@node01 opt]# docker run -it centos:7 /bin/bash	'//两个节点都创建并运行容器'
[root@8ffe415fb35e /]# yum -y install net-tools	'//两个容器中都安装网络工具'
[root@8ffe415fb35e /]# ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1450
        inet 172.17.26.2  netmask 255.255.255.0  broadcast 172.17.26.255
...省略内容	'//经过查看，node01节点容器的IP地址是172.17.26.2，node02节点容器的IP地址是172.17.4.2 '
[root@8ffe415fb35e /]# ping 172.17.4.2 	'//node01节点的容器ping node02节点的容器成功'
PING 172.17.4.2 (172.17.4.2) 56(84) bytes of data.
64 bytes from 172.17.4.2: icmp_seq=1 ttl=62 time=0.477 ms
64 bytes from 172.17.4.2: icmp_seq=2 ttl=62 time=0.697 ms
64 bytes from 172.17.4.2: icmp_seq=3 ttl=62 time=0.705 ms
^C
--- 172.17.4.2 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2002ms
rtt min/avg/max/mdev = 0.477/0.626/0.705/0.107 ms
[root@e8e969f37720 /]# ping 172.17.26.2	'//node02 ping node01容器'
PING 172.17.26.2 (172.17.26.2) 56(84) bytes of data.
64 bytes from 172.17.26.2: icmp_seq=1 ttl=62 time=0.813 ms
64 bytes from 172.17.26.2: icmp_seq=2 ttl=62 time=1.02 ms
64 bytes from 172.17.26.2: icmp_seq=3 ttl=62 time=0.513 ms
^C
--- 172.17.26.2 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2003ms
rtt min/avg/max/mdev = 0.513/0.785/1.029/0.211 ms
'//证明flannel网络部署成功'

6、部署master组件

下图是node节点的kubectl启动的流程图，根据此流程图，我们需要在master节点将kubelet-bootstrap用户绑定到集群，然后部署一些证书认证使node节点能够被master节点检测到并且成功连接。
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1、master节点操作，api-server生成证书

[root@master k8s]# mkdir -p /opt/kubernetes/{cfg,bin,ssl}	'//创建k8s工作目录'
[root@master k8s]# mkdir k8s-cert	'//创建k8s证书目录'
[root@master k8s]# unzip master.zip -d /opt/kubernetes/	'//解压 maste.zip'
[root@master k8s]# ls /opt/k8s/
apiserver.sh  bin  cfg  controller-manager.sh  scheduler.sh  ssl	'//发现controller-manager.sh 没有执行权限'
[root@master k8s]# chmod +x /opt/kubernetes/controller-manager.sh 	'//给执行权限'
[root@master k8s]# cd k8s-cert/
[root@master k8s-cert]# vim k8s-cert.sh
cat > ca-config.json <<EOF
{
  "signing": {
    "default": {
      "expiry": "87600h"
    },
    "profiles": {
      "kubernetes": {
         "expiry": "87600h",
         "usages": [
            "signing",
            "key encipherment",
            "server auth",
            "client auth"
        ]
      }
    }
  }
}
EOF

cat > ca-csr.json <<EOF
{
    "CN": "kubernetes",
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "L": "Beijing",
            "ST": "Beijing",
      	    "O": "k8s",
            "OU": "System"
        }
    ]
}
EOF

cfssl gencert -initca ca-csr.json | cfssljson -bare ca -

#-----------------------

cat > server-csr.json <<EOF
{
    "CN": "kubernetes",
    "hosts": [
      "10.0.0.1",
      "127.0.0.1",
      "192.168.233.131",	'//master1，配置文件中要删除此类注释'
      "192.168.233.130",	'//master2'
      "192.168.233.100",	'//VIP'
      "192.168.233.128",	'//nginx代理master'
      "192.168.233.129",	'//nginx代理backup'
      "kubernetes",
      "kubernetes.default",
      "kubernetes.default.svc",
      "kubernetes.default.svc.cluster",
      "kubernetes.default.svc.cluster.local"
    ],
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "L": "BeiJing",
            "ST": "BeiJing",
            "O": "k8s",
            "OU": "System"
        }
    ]
}
EOF

cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes server-csr.json | cfssljson -bare server

#-----------------------

cat > admin-csr.json <<EOF
{
  "CN": "admin",
  "hosts": [],
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "L": "BeiJing",
      "ST": "BeiJing",
      "O": "system:masters",
      "OU": "System"
    }
  ]
}
EOF

cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes admin-csr.json | cfssljson -bare admin

#-----------------------

cat > kube-proxy-csr.json <<EOF
{
  "CN": "system:kube-proxy",
  "hosts": [],
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "L": "BeiJing",
      "ST": "BeiJing",
      "O": "k8s",
      "OU": "System"
    }
  ]
}
EOF

cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes kube-proxy-csr.json | cfssljson -bare kube-proxy
'//为什么没有写node节点的IP地址？因为如果写了node节点IP地址，后期增加或者删除node节点的时候会非常麻烦'

2、生成证书

[root@master k8s-cert]# bash k8s-cert.sh 	'//生成证书'
[root@master k8s-cert]# ls
admin.csr       admin.pem       ca-csr.json  k8s-cert.sh          kube-proxy-key.pem  server-csr.json
admin-csr.json  ca-config.json  ca-key.pem   kube-proxy.csr       kube-proxy.pem      server-key.pem
admin-key.pem   ca.csr          ca.pem       kube-proxy-csr.json  server.csr          server.pem
[root@master k8s-cert]# ls *.pem
admin-key.pem  ca-key.pem  kube-proxy-key.pem  server-key.pem
admin.pem      ca.pem      kube-proxy.pem      server.pem
[root@master k8s-cert]# cp ca*.pem server*.pem /opt/kubernets/ssl/	'//复制证书到工作目录'
[root@master k8s-cert]# ls /opt/kubernets/ssl/
ca-key.pem  ca.pem  server-key.pem  server.pem

3、解压k8s服务器端压缩包

[root@master k8s-cert]# cd ..
[root@master k8s]# ls
cfssl.sh   etcd-v3.3.10-linux-amd64            k8s-cert
etcd-cert  etcd-v3.3.10-linux-amd64.tar.gz     kubernetes-server-linux-amd64.tar.gz
etcd.sh    flannel-v0.10.0-linux-amd64.tar.gz  master.zip
[root@master k8s]# tar zxvf kubernetes-server-linux-amd64.tar.gz

4、复制服务器端关键命令到k8s工作目录中

[root@master k8s]# cd kubernetes/server/bin/
[root@master bin]# cp kube-controller-manager kube-scheduler kubectl kube-apiserver /opt/kubernets/bin/
[root@master bin]# ls /opt/kubernetes/bin/
kube-apiserver  kube-controller-manager  kubectl  kube-scheduler

5、编辑令牌并绑定角色kubelet-bootstrap

[root@master bin]# cd /root/k8s/
[root@master k8s]# head -c 16 /dev/urandom | od -An -t x | tr -d ''	'//随机生成序列号'
 7ea8f86b 157225fd 4b927376 5e88a3ca
[root@master k8s]# vim /opt/kubernets/cfg/token.csv
7ea8f86b157225fd4b9273765e88a3ca,kubelet-bootstrap,10001,"system:kubelet-bootstrap"
'//序列号，用户名，id，角色，这个用户是master用来管理node节点的'

6、开启apiserver，将数据存放在etcd集群中并检查kube状态

[root@master kubernetes]# bash apiserver.sh 192.168.233.131 https://192.168.233.131:2379,https://192.168.233.132:2379,https://192.168.233.133:2379
[root@master kubernetes]# ls /opt/kubernetes/cfg/
kube-apiserver  token.csv
[root@master kubernetes]# netstat -ntap |grep kube
[root@master kubernetes]# ps aux |grep kube
[root@master kubernetes]# vim /opt/kubernetes/cfg/kube-apiserver 
    ...省略内容
--secure-port=6443 \	'//其实就是443，https协议通信端口'
...省略内容
[root@master kubernetes]# netstat -ntap |grep 6443
tcp        0      0 192.168.233.131:6443    0.0.0.0:*               LISTEN      12636/kube-apiserve 
tcp        0      0 192.168.233.131:40686   192.168.233.131:6443    ESTABLISHED 12636/kube-apiserve 
tcp        0      0 192.168.233.131:6443    192.168.233.131:40686   ESTABLISHED 12636/kube-apiserve

7、启动scheduler服务

[root@master kubernetes]# ./scheduler.sh 127.0.0.1
Created symlink from /etc/systemd/system/multi-user.target.wants/kube-scheduler.service to /usr/lib/systemd/system/kube-scheduler.service.
[root@master kubernetes]# systemctl status kube-scheduler

8、启动controller-manager

[root@master kubernetes]# ./controller-manager.sh 127.0.0.1
Created symlink from /etc/systemd/system/multi-user.target.wants/kube-controller-manager.service to /usr/lib/systemd/system/kube-controller-manager.service.
[root@master kubernetes]# systemctl status kube-controller-manager

9、查看master节点状态

[root@master kubernetes]# /opt/kubernetes/bin/kubectl get cs	'//发现是正常的，没问题'
NAME                 STATUS    MESSAGE             ERROR
controller-manager   Healthy   ok                  
scheduler            Healthy   ok                  
etcd-2               Healthy   {"health":"true"}   
etcd-1               Healthy   {"health":"true"}   
etcd-0               Healthy   {"health":"true"}

7、node01节点部署

1、master节点上将kubectl和kube-proxy拷贝到node节点

[root@master kubernetes]# cd /root/k8s/kubernetes/server/bin/
[root@master bin]# ls
apiextensions-apiserver              kube-apiserver.docker_tag           kube-proxy
cloud-controller-manager             kube-apiserver.tar                  kube-proxy.docker_tag
cloud-controller-manager.docker_tag  kube-controller-manager             kube-proxy.tar
cloud-controller-manager.tar         kube-controller-manager.docker_tag  kube-scheduler
hyperkube                            kube-controller-manager.tar         kube-scheduler.docker_tag
kubeadm                              kubectl                             kube-scheduler.tar
kube-apiserver                       kubelet  
[root@master bin]# scp kubelet kube-proxy root@192.168.233.132:/opt/k8s/bin
[root@master bin]# scp kubelet kube-proxy root@192.168.233.133:/opt/k8s/bin

2、node节点解压node.zip

[root@node01 ~]# rz -E
rz waiting to receive.
[root@node01 ~]# ls
anaconda-ks.cfg  flannel-v0.10.0-linux-amd64.tar.gz  node.zip
[root@node01 ~]# unzip node.zip
[root@node01 ~]# ls
anaconda-ks.cfg  flannel-v0.10.0-linux-amd64.tar.gz  kubelet.sh  node.zip  proxy.sh

3、master节点创建kubeconfig目录

[root@master bin]# cd /root/k8s/
[root@master k8s]# mkdir kubeconfig
[root@master k8s]# cd kubeconfig/
[root@master kubeconfig]# vim kubeconfig

APISERVER=$1
SSL_DIR=$2


# 创建kubelet bootstrapping kubeconfig 
export KUBE_APISERVER="https://$APISERVER:6443"

# 设置集群参数
kubectl config set-cluster kubernetes \
  --certificate-authority=$SSL_DIR/ca.pem \
  --embed-certs=true \
  --server=${KUBE_APISERVER} \
  --kubeconfig=bootstrap.kubeconfig

# 设置客户端认证参数
kubectl config set-credentials kubelet-bootstrap \
  --token=7ea8f86b157225fd4b9273765e88a3ca \	'//此token序列号就是之前/opt/kubernetes/cfg/token.csv 文件中使用的的'
  --kubeconfig=bootstrap.kubeconfig

# 设置上下文参数
kubectl config set-context default \
  --cluster=kubernetes \
  --user=kubelet-bootstrap \
  --kubeconfig=bootstrap.kubeconfig

# 设置默认上下文
kubectl config use-context default --kubeconfig=bootstrap.kubeconfig

#----------------------

# 创建kube-proxy kubeconfig文件

kubectl config set-cluster kubernetes \
  --certificate-authority=$SSL_DIR/ca.pem \
  --embed-certs=true \
  --server=${KUBE_APISERVER} \
  --kubeconfig=kube-proxy.kubeconfig

kubectl config set-credentials kube-proxy \
  --client-certificate=$SSL_DIR/kube-proxy.pem \
  --client-key=$SSL_DIR/kube-proxy-key.pem \
  --embed-certs=true \
  --kubeconfig=kube-proxy.kubeconfig

kubectl config set-context default \
  --cluster=kubernetes \
  --user=kube-proxy \
  --kubeconfig=kube-proxy.kubeconfig

kubectl config use-context default --kubeconfig=kube-proxy.kubeconfig
[root@master kubeconfig]# export PATH=$PATH://opt/kubernetes/bin	'//设置环境变量（可以写入到/etc/prlfile中）'

4、生成配置文件并拷贝到node节点

[root@master kubeconfig]# bash kubeconfig 192.168.233.131 /root/k8s/k8s-cert/
[root@master kubeconfig]# ls
bootstrap.kubeconfig  kubeconfig  kube-proxy.kubeconfig
[root@master kubeconfig]# scp bootstrap.kubeconfig kube-proxy.kubeconfig root@192.168.233.132:/opt/k8s/cfg
[root@master kubeconfig]# scp bootstrap.kubeconfig kube-proxy.kubeconfig root@192.168.233.133:/opt/k8s/cfg

5、创建bootstrap角色并赋予权限用于连接apiserver请求签名

[root@master kubeconfig]# kubectl create clusterrolebinding kubelet-bootstrap --clusterrole=system:node-bootstrapper --user=kubelet-bootstrap
clusterrolebinding.rbac.authorization.k8s.io/kubelet-bootstrap created

6、node01节点操作生成kubelet kubelet.config配置文件

[root@node01 ~]# vim kubelet.sh 	
'//将/opt/kubernetes路径都修改为/opt/k8s'
[root@node01 ~]# bash kubelet.sh 192.168.233.132
Created symlink from /etc/systemd/system/multi-user.target.wants/kubelet.service to /usr/lib/systemd/system/kubelet.service.
[root@node01 ~]# ls /opt/k8s/cfg/
bootstrap.kubeconfig  flanneld  kubelet  kubelet.config  kube-proxy.kubeconfig
[root@node01 ~]# systemctl status kubelet

7、master上检查到node01节点的请求，查看证书状态

[root@master kubeconfig]# kubectl get csr
NAME                                                   AGE   REQUESTOR           CONDITION
node-csr-xmi9gQiUIFuyZ9KAIKFIyf4JiQOuPN1tACjVzu_SH6s   71s   kubelet-bootstrap   Pending
'//pending：等待集群给该节点办法证书'

8、颁发证书，再次查看证书状态

[root@master kubeconfig]# kubectl certificate approve node-csr-xmi9gQiUIFuyZ9KAIKFIyf4JiQOuPN1tACjVzu_SH6s
certificatesigningrequest.certificates.k8s.io/node-csr-xmi9gQiUIFuyZ9KAIKFIyf4JiQOuPN1tACjVzu_SH6s approved
[root@master kubeconfig]# kubectl get csr
NAME                                                   AGE    REQUESTOR           CONDITION
node-csr-xmi9gQiUIFuyZ9KAIKFIyf4JiQOuPN1tACjVzu_SH6s   3m9s   kubelet-bootstrap   Approved,Issued	'//已经被允许加入集群'

9、查看集群状态并启动proxy服务

[root@master kubeconfig]# kubectl get node	'//如果有一个节点noready，检查kubelet，如果很多节点noready，那就检查apiserver，如果没问题再检查VIP地址，keepalived'
NAME              STATUS   ROLES    AGE   VERSION
192.168.233.132   Ready    <none>   92s   v1.12.3
[root@node01 ~]# vim proxy.sh 	'//修改配置文件，将/opt/kubernetes路径换成/opt/k8s'
[root@node01 ~]# bash proxy.sh 192.168.233.132
Created symlink from /etc/systemd/system/multi-user.target.wants/kube-proxy.service to /usr/lib/systemd/system/kube-proxy.service.
[root@node01 ~]# systemctl status kube-proxy.service	'//发现服务是running状态'

1.8：node02节点部署
1、将node01之前生成的配置文件直接复制到node02

[root@node01 ~]# scp -r /opt/k8s/cfg/ root@192.168.233.133:/opt/k8s/cfg/
[root@node01 ~]# scp /usr/lib/systemd/system/{kubelet,kube-proxy}.service root@192.168.233.133:/usr/lib/systemd/system	'//复制启动脚本过去'

2、修改三个配置文件的IP地址

[root@node02 ~]# cd /opt/k8s/cfg/
[root@node02 cfg]# vim kubelet
--hostname-override=192.168.233.133 \	'//修改为自己的IP地址'
[root@node02 cfg]# vim kubelet.config 
address: 192.168.233.133
[root@node02 cfg]# vim kube-proxy
--hostname-override=192.168.233.133 \

3、启动服务并查看状态

[root@node02 cfg]# systemctl start kubelet
[root@node02 cfg]# systemctl enable kubelet
Created symlink from /etc/systemd/system/multi-user.target.wants/kubelet.service to /usr/lib/systemd/system/kubelet.service.
[root@node02 cfg]# systemctl status kubelet
[root@node02 cfg]# systemctl start kube-proxy
[root@node02 cfg]# systemctl enable kube-proxy
Created symlink from /etc/systemd/system/multi-user.target.wants/kube-proxy.service to /usr/lib/systemd/system/kube-proxy.service.
[root@node02 cfg]# systemctl status kube-proxy

master上操作查看请求并同意node02证书

[root@master kubeconfig]# kubectl get csr
NAME                                                   AGE   REQUESTOR           CONDITION
node-csr-A8BX2W67HKODPGvn0Q0dZ8Lr5Q8_2fXFt1O0STzZdis   74s   kubelet-bootstrap   Pending
node-csr-xmi9gQiUIFuyZ9KAIKFIyf4JiQOuPN1tACjVzu_SH6s   21m   kubelet-bootstrap   Approved,Issued
[root@master kubeconfig]# kubectl certificate approve node-csr-A8BX2W67HKODPGvn0Q0dZ8Lr5Q8_2fXFt1O0STzZdis	'//同意证书'
certificatesigningrequest.certificates.k8s.io/node-csr-A8BX2W67HKODPGvn0Q0dZ8Lr5Q8_2fXFt1O0STzZdis approved	
[root@master kubeconfig]# kubectl get csr
NAME                                                   AGE   REQUESTOR           CONDITION
node-csr-A8BX2W67HKODPGvn0Q0dZ8Lr5Q8_2fXFt1O0STzZdis   99s   kubelet-bootstrap   Approved,Issued
node-csr-xmi9gQiUIFuyZ9KAIKFIyf4JiQOuPN1tACjVzu_SH6s   21m   kubelet-bootstrap   Approved,Issued
[root@master kubeconfig]# kubectl get node
NAME              STATUS   ROLES    AGE   VERSION
192.168.233.132   Ready    <none>   19m   v1.12.3
192.168.233.133   Ready    <none>   44s   v1.12.3
# docker # kubernetes # linux
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