kubernetes 部署：二进制方式 部署 kubernetes 集群

部署方式：
方式1. minikube
Minikube是一个工具，可以在本地快速运行一个单点的Kubernetes，尝试Kubernetes或日常开发的用户使用。不能用于生产环境。
官方地址：https://kubernetes.io/docs/setup/minikube/

方式2. kubeadm
Kubeadm也是一个工具，提供kubeadm init和kubeadm join，用于快速部署Kubernetes集群。
官方地址：https://kubernetes.io/docs/reference/setup-tools/kubeadm/kubeadm/

方式3. 直接使用epel-release yum源，缺点就是版本较低

方式4. 二进制包
从官方下载发行版的二进制包，手动部署每个组件，组成Kubernetes集群。

官方也提供了一个互动测试环境供大家测试：https://kubernetes.io/zh/docs/tutorials/kubernetes-basics/cluster-interactive/
https://kubernetes.io/docs/tutorials/kubernetes-basics/

二进制方式部署 kubernetes 集群

目标任务

1 Kubernetes集群部署架构规划
2 部署Etcd集群
3 在Node节点安装Docker
4 部署Flannel网络
5 在Master节点部署组件
6 在Node节点部署组件
7 查看集群状态
8 运行一个测试示例
9 部署Dashboard（Web UI）

1. 准备

三台虚拟机
固定IP、改名字、相互解析、关闭防火墙
# systemctl stop firewalld;setenforce 0
# vim /etc/hosts
192.168.1.18 k8s-master
192.168.1.22 k8s-node1
192.168.1.25 k8s-node2

软件版本：
    Docker  18.09.0-ce
    Kubernetes  1.11

服务器角色、IP、组件：
    k8s-master       
        192.168.1.18    kube-apiserver，kube-controller-manager，kube-scheduler，etcd

    k8s-node1           
        192.168.1.22    kubelet，kube-proxy，docker，flannel，etcd

    k8s-node2           
        192.168.1.25    kubelet，kube-proxy，docker，flannel，etcd
因我电脑配置较低 etcd 配置在了三台服务器上，实际生产环境中应该部署在单独的三台服务器

2. 部署Etcd集群

使用cfssl来生成自签证书，任何机器都行，证书这块儿知道怎么生成、怎么用即可，暂且不用过多研究。

#下载cfssl工具
[root@k8s-master k8s]# wget https://pkg.cfssl.org/R1.2/cfssl_linux-amd64
[root@k8s-master k8s]# wget https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64
[root@k8s-master k8s]# wget https://pkg.cfssl.org/R1.2/cfssl-certinfo_linux-amd64
[root@k8s-master k8s]# ls
cfssl-certinfo_linux-amd64  cfssljson_linux-amd64  cfssl_linux-amd64
[root@k8s-master k8s]# chmod +x cfssl*
[root@k8s-master k8s]# mv cfssl_linux-amd64 /usr/local/bin/cfssl
[root@k8s-master k8s]# mv cfssljson_linux-amd64 /usr/local/bin/cfssljson
[root@k8s-master k8s]# mv cfssl-certinfo_linux-amd64 /usr/bin/cfssl-certinfo

#生成Etcd证书
[root@k8s-master k8s]# vim ca-config.json
[root@k8s-master k8s]# cat ca-config.json 
{
  "signing": {
    "default": {
      "expiry": "87600h"
    },
    "profiles": {
      "www": {
         "expiry": "87600h",
         "usages": [
            "signing",
            "key encipherment",
            "server auth",
            "client auth"
        ]
      }
    }
  }
}

[root@k8s-master k8s]# vim ca-csr.json
[root@k8s-master k8s]# cat ca-csr.json
{
    "CN": "etcd CA",
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "L": "Beijing",
            "ST": "Beijing"
        }
    ]
}

[root@k8s-master k8s]# vim server-csr.json
[root@k8s-master k8s]# cat server-csr.json     #IP填写etcd集群的IP
{
    "CN": "etcd",
    "hosts": [
    "192.168.1.18",
    "192.168.1.22",
    "192.168.1.25"
    ],
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "L": "BeiJing",
            "ST": "BeiJing"
        }
    ]
}

#生成证书
[root@k8s-master k8s]# cfssl gencert -initca ca-csr.json | cfssljson -bare ca -
[root@k8s-master k8s]# cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=www server-csr.json | cfssljson -bare server
[root@k8s-master k8s]# ls *pem
ca-key.pem  ca.pem  server-key.pem  server.pem

#安装Etcd，三台都配置
# wget https://github.com/etcd-io/etcd/releases/download/v3.2.12/etcd-v3.2.12-linux-amd64.tar.gz
# mkdir /opt/etcd/{bin,cfg,ssl} -p
# tar zxvf etcd-v3.2.12-linux-amd64.tar.gz
# mv etcd-v3.2.12-linux-amd64/{etcd,etcdctl} /opt/etcd/bin/

#创建etcd配置文件，三台都配置：IP要写当前的
[root@k8s-master ~]# vim /opt/etcd/cfg/etcd
[root@k8s-master ~]# cat /opt/etcd/cfg/etcd
#[Member]
ETCD_NAME="etcd01"     #节点名称   修改
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"     #数据目录
ETCD_LISTEN_PEER_URLS="https://192.168.1.18:2380"     #集群通信监听地址   修改
ETCD_LISTEN_CLIENT_URLS="https://192.168.1.18:2379"     #客户端访问监听地址   修改

#[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.1.18:2380"     #集群通告地址   修改
ETCD_ADVERTISE_CLIENT_URLS="https://192.168.1.18:2379"     #客户端通告地址   修改
ETCD_INITIAL_CLUSTER="etcd01=https://192.168.1.18:2380,etcd02=https://192.168.1.22:2380,etcd03=https://192.168.1.25:2380"     #集群节点地址   修改名字和IP对应
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"     #集群Token
ETCD_INITIAL_CLUSTER_STATE="new"     #加入集群的当前状态，new是新集群，existing表示加入已有集群

#systemd管理etcd，三台都配置
[root@k8s-master ~]# vim /usr/lib/systemd/system/etcd.service
[root@k8s-master ~]# cat /usr/lib/systemd/system/etcd.service
[Unit]
Description=Etcd Server
After=network.target
After=network-online.target
Wants=network-online.target

[Service]
Type=notify
EnvironmentFile=/opt/etcd/cfg/etcd
ExecStart=/opt/etcd/bin/etcd \
--name=${ETCD_NAME} \
--data-dir=${ETCD_DATA_DIR} \
--listen-peer-urls=${ETCD_LISTEN_PEER_URLS} \
--listen-client-urls=${ETCD_LISTEN_CLIENT_URLS},http://127.0.0.1:2379 \
--advertise-client-urls=${ETCD_ADVERTISE_CLIENT_URLS} \
--initial-advertise-peer-urls=${ETCD_INITIAL_ADVERTISE_PEER_URLS} \
--initial-cluster=${ETCD_INITIAL_CLUSTER} \
--initial-cluster-token=${ETCD_INITIAL_CLUSTER_TOKEN} \
--initial-cluster-state=new \
--cert-file=/opt/etcd/ssl/server.pem \
--key-file=/opt/etcd/ssl/server-key.pem \
--peer-cert-file=/opt/etcd/ssl/server.pem \
--peer-key-file=/opt/etcd/ssl/server-key.pem \
--trusted-ca-file=/opt/etcd/ssl/ca.pem \
--peer-trusted-ca-file=/opt/etcd/ssl/ca.pem
Restart=on-failure
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target

#把刚才生成的证书拷贝到配置文件中的位置
[root@k8s-master ~]# cp /k8s/*pem /opt/etcd/ssl

#启动并设置开启启动，三台都配置
# systemctl start etcd
# systemctl enable etcd

#检查etcd集群状态
[root@k8s-master ~]# /opt/etcd/bin/etcdctl \
--ca-file=/opt/etcd/ssl/ca.pem --cert-file=/opt/etcd/ssl/server.pem --key-file=/opt/etcd/ssl/server-key.pem \
--endpoints="https://192.168.1.18:2379,https://192.168.1.22:2379,https://192.168.1.25:2379" \
cluster-health

cluster is healthy 输出此行，集群部署成功

3. node节点安装docker

# yum install -y yum-utils device-mapper-persistent-data lvm2

# yum-config-manager --add-repo https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

# yum makecache fast
# yum -y install docker-ce

# systemctl start docker
# systemctl enable docker

# docker -v
Docker version 19.03.8, build afacb8b

4. 部署Flannel网络

工作原理

image.png

#Falnnel要用etcd存储自身一个子网信息，所以要保证能成功连接Etcd，写入预定义子网段，注意修改IP
[root@k8s-master ~]# cd /opt/etcd/ssl/
[root@k8s-master ssl]# ls
ca-key.pem  ca.pem  server-key.pem  server.pem

[root@k8s-master ssl]# /opt/etcd/bin/etcdctl \
> --ca-file=ca.pem --cert-file=server.pem --key-file=server-key.pem \
> --endpoints="https://192.168.1.18:2379,https://192.168.1.22:2379,https://192.168.1.25:2379" \
> set /coreos.com/network/config  '{ "Network": "172.17.0.0/16", "Backend": {"Type": "vxlan"}}'

#安装Flannel，node节点操作
# wget https://github.com/coreos/flannel/releases/download/v0.10.0/flannel-v0.10.0-linux-amd64.tar.gz
# tar xzvf flannel-v0.10.0-linux-amd64.tar.gz
# mkdir -p /opt/kubernetes/bin
# mv flanneld mk-docker-opts.sh /opt/kubernetes/bin

#配置Flannel，node节点操作
# mkdir -p /opt/kubernetes/cfg/
# vim /opt/kubernetes/cfg/flanneld
# vim /opt/kubernetes/cfg/flanneld
# cat /opt/kubernetes/cfg/flanneld     #注意修改IP
FLANNEL_OPTIONS="--etcd-endpoints=https://192.168.1.18:2379,https://192.168.1.22:2379,https://192.168.1.25:2379 -etcd-cafile=/opt/etcd/ssl/ca.pem -etcd-certfile=/opt/etcd/ssl/server.pem -etcd-keyfile=/opt/etcd/ssl/server-key.pem"

#systemd管理Flannel，node节点操作
# vim /usr/lib/systemd/system/flanneld.service
# cat /usr/lib/systemd/system/flanneld.service
[Unit]
Description=Flanneld overlay address etcd agent
After=network-online.target network.target
Before=docker.service

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

[Install]
WantedBy=multi-user.target

#配置Docker启动指定子网段，node节点操作
# vim /usr/lib/systemd/system/docker.service
# cat /usr/lib/systemd/system/docker.service
[Unit]
Description=Docker Application Container Engine
Documentation=https://docs.docker.com
After=network-online.target firewalld.service
Wants=network-online.target

[Service]
Type=notify
EnvironmentFile=/run/flannel/subnet.env
ExecStart=/usr/bin/dockerd $DOCKER_NETWORK_OPTIONS
ExecReload=/bin/kill -s HUP $MAINPID
LimitNOFILE=infinity
LimitNPROC=infinity
LimitCORE=infinity
TimeoutStartSec=0
Delegate=yes
KillMode=process
Restart=on-failure
StartLimitBurst=3
StartLimitInterval=60s

[Install]
WantedBy=multi-user.target

#将证书拷贝到node节点
[root@k8s-master ~]# scp /k8s/*pem k8s-node1:/opt/etcd/ssl
[root@k8s-master ~]# scp /k8s/*pem k8s-node2:/opt/etcd/ssl

#重启flannel和docker，node节点操作
# systemctl daemon-reload
# systemctl start flanneld
# systemctl enable flanneld
# systemctl restart docker

#检查是否生效，node节点操作
[root@k8s-node1 ~]# ps -ef |grep docker
root      12103      1  2 18:07 ?        00:00:00 /usr/bin/dockerd --bip=172.17.90.1/24 --ip-masq=false --mtu=1450
root      12240  10550  0 18:07 pts/0    00:00:00 grep --color=auto docker

[root@k8s-node2 ~]# ps -ef |grep docker
root      12112      1  1 18:07 ?        00:00:00 /usr/bin/dockerd --bip=172.17.96.1/24 --ip-masq=false --mtu=1450
root      12267   1314  0 18:08 pts/0    00:00:00 grep --color=auto docker

#确保node节点的docker0与flannel.1在同一网段，node节点网段互相不一样
[root@k8s-node1 ~]# ifconfig docker0 | grep inet | head -n 1 | awk '{print $2}' 
172.17.90.1
[root@k8s-node1 ~]# ifconfig flannel.1 | grep inet | head -n 1 | awk '{print $2}' 
172.17.90.0

[root@k8s-node2 ~]# ifconfig docker0 | grep inet | head -n 1 | awk '{print $2}' 
172.17.96.1
[root@k8s-node2 ~]# ifconfig flannel.1 | grep inet | head -n 1 | awk '{print $2}' 
172.17.96.0

#node节点互相ping测试
[root@k8s-node1 ~]# ping 172.17.96.1
[root@k8s-node2 ~]# ping 172.17.90.1

#ping通Flannel部署成功

5. 在Master节点部署组件

在部署Kubernetes之前一定要确保etcd、flannel、docker是正常工作的。

5.1 生成证书

[root@k8s-master ~]# cd /k8s/
[root@k8s-master k8s]# ls
ca-config.json  ca.csr  ca-csr.json  ca-key.pem  ca.pem  server.csr  server-csr.json  server-key.pem  server.pem
[root@k8s-master k8s]# mkdir etcdsslbk
[root@k8s-master k8s]# mv * etcdsslbk/
mv: 无法将目录"etcdsslbk" 移动至自身的子目录"etcdsslbk/etcdsslbk" 下
[root@k8s-master k8s]# ls
etcdsslbk
[root@k8s-master k8s]# ls etcdsslbk/
ca-config.json  ca.csr  ca-csr.json  ca-key.pem  ca.pem  server.csr  server-csr.json  server-key.pem  server.pem

[root@k8s-master k8s]# vim ca-config.json
[root@k8s-master k8s]# cat ca-config.json
{
  "signing": {
    "default": {
      "expiry": "87600h"
    },
    "profiles": {
      "kubernetes": {
         "expiry": "87600h",
         "usages": [
            "signing",
            "key encipherment",
            "server auth",
            "client auth"
        ]
      }
    }
  }
}

[root@k8s-master k8s]# vim ca-csr.json
[root@k8s-master k8s]# cat ca-csr.json
{
    "CN": "kubernetes",
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "L": "Beijing",
            "ST": "Beijing",
            "O": "k8s",
            "OU": "System"
        }
    ]
}

[root@k8s-master k8s]# cfssl gencert -initca ca-csr.json | cfssljson -bare ca -

#生成apiserver证书
[root@k8s-master k8s]# vim server-csr.json
[root@k8s-master k8s]# cat server-csr.json
{
    "CN": "kubernetes",
    "hosts": [
      "192.168.1.1",     #这个是后边dns要用的虚拟网络的网关
      "127.0.0.1",
      "192.168.1.18",     #k8s集群IP
      "192.168.1.22",     #k8s集群IP
      "192.168.1.25",     #k8s集群IP
      "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"
        }
    ]
}

[root@k8s-master k8s]# cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes server-csr.json | cfssljson -bare server

#生成kube-proxy证书
[root@k8s-master k8s]# vim kube-proxy-csr.json
[root@k8s-master k8s]# cat kube-proxy-csr.json
{
  "CN": "system:kube-proxy",
  "hosts": [],
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "L": "BeiJing",
      "ST": "BeiJing",
      "O": "k8s",
      "OU": "System"
    }
  ]
}

[root@k8s-master k8s]# cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes kube-proxy-csr.json | cfssljson -bare kube-proxy

[root@k8s-master k8s]# ls *.pem
ca-key.pem  ca.pem  kube-proxy-key.pem  kube-proxy.pem  server-key.pem  server.pem

5.2 部署apiserver组件

浏览器访问此链接下载包，传到服务器（https://dl.k8s.io/v1.11.0/kubernetes-server-linux-amd64.tar.gz）

[root@k8s-master ~]# mkdir /opt/kubernetes/{bin,cfg,ssl} -p
[root@k8s-master ~]# tar zxvf kubernetes-server-linux-amd64.tar.gz
[root@k8s-master ~]# cd kubernetes/server/bin
[root@k8s-master bin]# cp kube-apiserver kube-scheduler kube-controller-manager kubectl /opt/kubernetes/bin

#将生成的证书拷贝到master对应目录
[root@k8s-master ~]# cd /k8s/
[root@k8s-master k8s]# cp server.pem  server-key.pem ca.pem ca-key.pem /opt/kubernetes/ssl/

#创建token文件
[root@k8s-master k8s]# vim /opt/kubernetes/cfg/token.csv
[root@k8s-master k8s]# cat /opt/kubernetes/cfg/token.csv
674c457d4dcf2eefe4920d7dbb6b0ddc,kubelet-bootstrap,10001,"system:kubelet-bootstrap"
#第一列：随机字符串，自己可生成，第二列：用户名，第三列：UID，第四列：用户组。

#创建apiserver配置文件
[root@k8s-master k8s]# vim /opt/kubernetes/cfg/kube-apiserver
[root@k8s-master k8s]# cat /opt/kubernetes/cfg/kube-apiserver
KUBE_APISERVER_OPTS="--logtostderr=true \
--v=4 \
--etcd-servers=https://192.168.1.18:2379,https://192.168.1.22:2379,https://192.168.1.25:2379 \
--bind-address=192.168.1.18 \
--secure-port=6443 \
--advertise-address=192.168.1.18 \
--allow-privileged=true \
--service-cluster-ip-range=192.168.1.0/24 \
--enable-admission-plugins=NamespaceLifecycle,LimitRanger,ServiceAccount,ResourceQuota,NodeRestriction \
--authorization-mode=RBAC,Node \
--enable-bootstrap-token-auth \
--token-auth-file=/opt/kubernetes/cfg/token.csv \
--service-node-port-range=30000-50000 \
--tls-cert-file=/opt/kubernetes/ssl/server.pem  \
--tls-private-key-file=/opt/kubernetes/ssl/server-key.pem \
--client-ca-file=/opt/kubernetes/ssl/ca.pem \
--service-account-key-file=/opt/kubernetes/ssl/ca-key.pem \
--etcd-cafile=/opt/etcd/ssl/ca.pem \
--etcd-certfile=/opt/etcd/ssl/server.pem \
--etcd-keyfile=/opt/etcd/ssl/server-key.pem"

#参数说明：
--logtostderr 启用日志
--v 日志等级
--etcd-servers etcd集群地址
--bind-address 监听地址
--secure-port https安全端口
--advertise-address 集群通告地址
--allow-privileged 启用授权
--service-cluster-ip-range Service虚拟IP地址段
--enable-admission-plugins 准入控制模块
--authorization-mode 认证授权，启用RBAC授权和节点自管理
--enable-bootstrap-token-auth 启用TLS bootstrap功能，后面会讲到
--token-auth-file token文件
--service-node-port-range Service Node类型默认分配端口范围

#systemd管理apiserver
[root@k8s-master k8s]# vim /usr/lib/systemd/system/kube-apiserver.service
[root@k8s-master k8s]# cat /usr/lib/systemd/system/kube-apiserver.service
[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/kubernetes/kubernetes

[Service]
EnvironmentFile=-/opt/kubernetes/cfg/kube-apiserver
ExecStart=/opt/kubernetes/bin/kube-apiserver $KUBE_APISERVER_OPTS
Restart=on-failure

[Install]
WantedBy=multi-user.target

#启动apiserver
[root@k8s-master k8s]# systemctl daemon-reload
[root@k8s-master k8s]# systemctl start kube-apiserver
[root@k8s-master k8s]# systemctl enable kube-apiserver

5.3 部署schduler组件

[root@k8s-master k8s]# vim /opt/kubernetes/cfg/kube-scheduler
[root@k8s-master k8s]# cat /opt/kubernetes/cfg/kube-scheduler
KUBE_SCHEDULER_OPTS="--logtostderr=true \
--v=4 \
--master=127.0.0.1:8080 \
--leader-elect"

#参数说明：
--master 连接本地apiserver
--leader-elect 当该组件启动多个时，自动选举（HA）

#systemd管理schduler组件
[root@k8s-master k8s]# vim /usr/lib/systemd/system/kube-scheduler.service
[root@k8s-master k8s]# cat /usr/lib/systemd/system/kube-scheduler.service
[Unit]
Description=Kubernetes Scheduler
Documentation=https://github.com/kubernetes/kubernetes

[Service]
EnvironmentFile=-/opt/kubernetes/cfg/kube-scheduler
ExecStart=/opt/kubernetes/bin/kube-scheduler $KUBE_SCHEDULER_OPTS
Restart=on-failure

[Install]
WantedBy=multi-user.target

#启动
[root@k8s-master k8s]# systemctl daemon-reload
[root@k8s-master k8s]# systemctl start kube-scheduler
[root@k8s-master k8s]# systemctl enable kube-scheduler

5.4 部署controller-manager组件

[root@k8s-master k8s]# vim /opt/kubernetes/cfg/kube-controller-manager
[root@k8s-master k8s]# cat /opt/kubernetes/cfg/kube-controller-manager
KUBE_CONTROLLER_MANAGER_OPTS="--logtostderr=true \
--v=4 \
--master=127.0.0.1:8080 \
--leader-elect=true \
--address=127.0.0.1 \
--service-cluster-ip-range=192.168.1.0/24 \
--cluster-name=kubernetes \
--cluster-signing-cert-file=/opt/kubernetes/ssl/ca.pem \
--cluster-signing-key-file=/opt/kubernetes/ssl/ca-key.pem  \
--root-ca-file=/opt/kubernetes/ssl/ca.pem \
--service-account-private-key-file=/opt/kubernetes/ssl/ca-key.pem"

#systemd管理controller-manager组件
[root@k8s-master k8s]# vim /usr/lib/systemd/system/kube-controller-manager.service
[root@k8s-master k8s]# cat /usr/lib/systemd/system/kube-controller-manager.service
[Unit]
Description=Kubernetes Controller Manager
Documentation=https://github.com/kubernetes/kubernetes

[Service]
EnvironmentFile=-/opt/kubernetes/cfg/kube-controller-manager
ExecStart=/opt/kubernetes/bin/kube-controller-manager $KUBE_CONTROLLER_MANAGER_OPTS
Restart=on-failure

[Install]
WantedBy=multi-user.target

#启动
[root@k8s-master k8s]# systemctl daemon-reload
[root@k8s-master k8s]# systemctl start kube-controller-manager
[root@k8s-master k8s]# systemctl enable kube-controller-manager

5.5 通过kubectl工具查看当前集群组件状态

[root@k8s-master k8s]# /opt/kubernetes/bin/kubectl get cs
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"}   

如上输出说明组件都正常

6. 在Node节点部署组件

Master apiserver启用TLS认证后，Node节点kubelet组件想要加入集群，必须使用CA签发的有效证书才能与apiserver通信，当Node节点很多时，签署证书是一件很繁琐的事情，因此有了TLS Bootstrapping机制，kubelet会以一个低权限用户自动向apiserver申请证书，kubelet的证书由apiserver动态签署。

6.1 master节点操作

#将kubelet-bootstrap用户绑定到系统集群角色
[root@k8s-master k8s]# /opt/kubernetes/bin/kubectl create clusterrolebinding kubelet-bootstrap \
   --clusterrole=system:node-bootstrapper \
   --user=kubelet-bootstrap

#创建kubeconfig文件，在生成kubernetes证书的目录下执行以下命令生成kubeconfig文件：
#指定apiserver 内网负载均衡地址
[root@k8s-master k8s]# KUBE_APISERVER="https://192.168.1.18:6443"
[root@k8s-master k8s]# BOOTSTRAP_TOKEN=674c457d4dcf2eefe4920d7dbb6b0ddc

#设置集群参数
[root@k8s-master k8s]# /opt/kubernetes/bin/kubectl config set-cluster kubernetes \
  --certificate-authority=./ca.pem \
  --embed-certs=true \
  --server=${KUBE_APISERVER} \
  --kubeconfig=bootstrap.kubeconfig

#设置客户端认证参数
[root@k8s-master k8s]# /opt/kubernetes/bin/kubectl config set-credentials kubelet-bootstrap \
  --token=${BOOTSTRAP_TOKEN} \
  --kubeconfig=bootstrap.kubeconfig

#设置上下文参数
[root@k8s-master k8s]# /opt/kubernetes/bin/kubectl config set-context default \
  --cluster=kubernetes \
  --user=kubelet-bootstrap \
  --kubeconfig=bootstrap.kubeconfig

#设置默认上下文
[root@k8s-master k8s]# /opt/kubernetes/bin/kubectl config use-context default --kubeconfig=bootstrap.kubeconfig


#创建kube-proxy kubeconfig文件
[root@k8s-master k8s]# /opt/kubernetes/bin/kubectl config set-cluster kubernetes \
  --certificate-authority=./ca.pem \
  --embed-certs=true \
  --server=${KUBE_APISERVER} \
  --kubeconfig=kube-proxy.kubeconfig

[root@k8s-master k8s]# /opt/kubernetes/bin/kubectl config set-credentials kube-proxy \
  --client-certificate=./kube-proxy.pem \
  --client-key=./kube-proxy-key.pem \
  --embed-certs=true \
  --kubeconfig=kube-proxy.kubeconfig

[root@k8s-master k8s]# /opt/kubernetes/bin/kubectl config set-context default \
  --cluster=kubernetes \
  --user=kube-proxy \
  --kubeconfig=kube-proxy.kubeconfig

[root@k8s-master k8s]# /opt/kubernetes/bin/kubectl config use-context default --kubeconfig=kube-proxy.kubeconfig


#将这两个文件拷贝到Node节点/opt/kubernetes/cfg/目录下。
[root@k8s-master k8s]# scp bootstrap.kubeconfig kube-proxy.kubeconfig k8s-node1:/opt/kubernetes/cfg/
[root@k8s-master k8s]# scp bootstrap.kubeconfig kube-proxy.kubeconfig k8s-node2:/opt/kubernetes/cfg/


#部署kubelet组件，将前面下载的二进制包中的kubelet和kube-proxy拷贝到Node节点/opt/kubernetes/bin目录下。
[root@k8s-master k8s]# cd /root/kubernetes/server/bin/
[root@k8s-master bin]# scp kubelet kube-proxy k8s-node1:/opt/kubernetes/bin/
[root@k8s-master bin]# scp kubelet kube-proxy k8s-node2:/opt/kubernetes/bin/

6.2 部署kubelet组件

所有node节点操作

#创建kubelet配置文件
[root@k8s-node1 ~]# vim /opt/kubernetes/cfg/kubelet
[root@k8s-node1 ~]# cat /opt/kubernetes/cfg/kubelet
KUBELET_OPTS="--logtostderr=true \
--v=4 \
--hostname-override=192.168.1.22 \     #修改为本机为IP
--kubeconfig=/opt/kubernetes/cfg/kubelet.kubeconfig \
--bootstrap-kubeconfig=/opt/kubernetes/cfg/bootstrap.kubeconfig \
--config=/opt/kubernetes/cfg/kubelet.config \
--cert-dir=/opt/kubernetes/ssl \
--pod-infra-container-image=registry.cn-hangzhou.aliyuncs.com/google-containers/pause-amd64:3.0"

#参数说明：
--hostname-override 在集群中显示的主机名
--kubeconfig 指定kubeconfig文件位置，会自动生成
--bootstrap-kubeconfig 指定刚才生成的bootstrap.kubeconfig文件
--cert-dir 颁发证书存放位置
--pod-infra-container-image 管理Pod网络的镜像

#其中/opt/kubernetes/cfg/kubelet.config配置文件如下
[root@k8s-node1 ~]# vim /opt/kubernetes/cfg/kubelet.config
[root@k8s-node1 ~]# cat /opt/kubernetes/cfg/kubelet.config
kind: KubeletConfiguration
apiVersion: kubelet.config.k8s.io/v1beta1
address: 192.168.1.22     #修改为本机为IP
port: 10250
readOnlyPort: 10255
cgroupDriver: cgroupfs
clusterDNS: ["192.168.1.2"]
clusterDomain: cluster.local.
failSwapOn: false
authentication:
  anonymous:
    enabled: true 
  webhook:
    enabled: false

#systemd管理kubelet组件
[root@k8s-node1 ~]# vim /usr/lib/systemd/system/kubelet.service
[root@k8s-node1 ~]# cat /usr/lib/systemd/system/kubelet.service
[Unit]
Description=Kubernetes Kubelet
After=docker.service
Requires=docker.service

[Service]
EnvironmentFile=/opt/kubernetes/cfg/kubelet
ExecStart=/opt/kubernetes/bin/kubelet $KUBELET_OPTS
Restart=on-failure
KillMode=process

[Install]
WantedBy=multi-user.target

#启动
[root@k8s-node1 ~]# systemctl daemon-reload
[root@k8s-node1 ~]# systemctl start kubelet
[root@k8s-node1 ~]# systemctl enable kubelet

#在Master审批Node加入集群
[root@k8s-master bin]# /opt/kubernetes/bin/kubectl get csr
NAME                                                   AGE       REQUESTOR           CONDITION
node-csr-Oecfo2IVLnnCGoYqhQ3f6q7FbN0C2Dr7c0o8j-6v2rI   2m        kubelet-bootstrap   Pending
node-csr-tRpwDHVhxW-9DxLkW_hu2XErEs1LBveGaah9_cREJrE   2m        kubelet-bootstrap   Pending

[root@k8s-master bin]# /opt/kubernetes/bin/kubectl certificate approve node-csr-Oecfo2IVLnnCGoYqhQ3f6q7FbN0C2Dr7c0o8j-6v2rI

[root@k8s-master bin]# /opt/kubernetes/bin/kubectl certificate approve node-csr-tRpwDHVhxW-9DxLkW_hu2XErEs1LBveGaah9_cREJrE

[root@k8s-master bin]# /opt/kubernetes/bin/kubectl get csr
NAME                                                   AGE       REQUESTOR           CONDITION
node-csr-Oecfo2IVLnnCGoYqhQ3f6q7FbN0C2Dr7c0o8j-6v2rI   3m        kubelet-bootstrap   Approved,Issued
node-csr-tRpwDHVhxW-9DxLkW_hu2XErEs1LBveGaah9_cREJrE   2m        kubelet-bootstrap   Approved,Issued

[root@k8s-master bin]# /opt/kubernetes/bin/kubectl get node
NAME           STATUS    ROLES     AGE       VERSION
192.168.1.22   Ready         6s        v1.11.0
192.168.1.25   Ready         13s       v1.11.0

6.3 部署kube-proxy组件

所有node节点操作

#创建kube-proxy配置文件
[root@k8s-node1 ~]# vim /opt/kubernetes/cfg/kube-proxy
[root@k8s-node1 ~]# cat /opt/kubernetes/cfg/kube-proxy
KUBE_PROXY_OPTS="--logtostderr=true \
--v=4 \
--hostname-override=192.168.1.22 \     #修改为本机IP
--cluster-cidr=192.168.1.0/24 \
--kubeconfig=/opt/kubernetes/cfg/kube-proxy.kubeconfig"

#systemd管理kube-proxy组件
[root@k8s-node1 ~]# vim /usr/lib/systemd/system/kube-proxy.service
[root@k8s-node1 ~]# cat /usr/lib/systemd/system/kube-proxy.service
[Unit]
Description=Kubernetes Proxy
After=network.target

[Service]
EnvironmentFile=-/opt/kubernetes/cfg/kube-proxy
ExecStart=/opt/kubernetes/bin/kube-proxy $KUBE_PROXY_OPTS
Restart=on-failure

[Install]
WantedBy=multi-user.target

#启动
[root@k8s-node1 ~]# systemctl daemon-reload
[root@k8s-node1 ~]# systemctl start kube-proxy
[root@k8s-node1 ~]# systemctl enable kube-proxy

7. 查看集群状态

master查看

[root@k8s-master bin]# /opt/kubernetes/bin/kubectl get node
NAME           STATUS    ROLES     AGE       VERSION
192.168.1.22   Ready         8m        v1.11.0
192.168.1.25   Ready         8m        v1.11.0

[root@k8s-master bin]# /opt/kubernetes/bin/kubectl get cs
NAME                 STATUS    MESSAGE              ERROR
scheduler            Healthy   ok                   
controller-manager   Healthy   ok                   
etcd-1               Healthy   {"health": "true"}   
etcd-2               Healthy   {"health": "true"}   
etcd-0               Healthy   {"health": "true"}

8. 运行一个测试示例

创建一个Nginx Web，判断集群是否正常工作

[root@k8s-master bin]# /opt/kubernetes/bin/kubectl run nginx --image=nginx --replicas=3

[root@k8s-master bin]# /opt/kubernetes/bin/kubectl expose deployment nginx --port=88 --target-port=80 --type=NodePort

查看Pod，Service：
[root@k8s-master bin]# /opt/kubernetes/bin/kubectl get pods
NAME                     READY     STATUS             RESTARTS   AGE
nginx-64f497f8fd-fjgt2   1/1       Running            0          3m
nginx-64f497f8fd-gmstq   1/1       Running            0          3m
nginx-64f497f8fd-q6wk9   1/1       Running            0          3m

查看pod详细信息：
[root@k8s-master bin]# /opt/kubernetes/bin/kubectl describe pod nginx-64f497f8fd-fjgt2

[root@k8s-master bin]# /opt/kubernetes/bin/kubectl get svc
NAME         TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)        AGE
kubernetes   ClusterIP   192.168.1.1             443/TCP        3m
nginx        NodePort    192.168.1.175           88:38696/TCP   3m


[root@k8s-master bin]# curl -I 192.168.1.22:38696
或者
浏览器访问：http://192.168.1.22:38696 测试

image.png

9. 部署Dashboard（Web UI）

部署UI有三个文件：
* dashboard-deployment.yaml           // 部署Pod，提供Web服务
* dashboard-rbac.yaml                 // 授权访问apiserver获取信息
* dashboard-service.yaml              // 发布服务，提供对外访问

[root@k8s-master ~]# mkdir /k8s/dashboard
[root@k8s-master ~]# cd /k8s/dashboard
[root@k8s-master dashboard]# vim dashboard-deployment.yaml
[root@k8s-master dashboard]# cat dashboard-deployment.yaml
apiVersion: apps/v1beta2
kind: Deployment
metadata:
  name: kubernetes-dashboard
  namespace: kube-system
  labels:
    k8s-app: kubernetes-dashboard
    kubernetes.io/cluster-service: "true"
    addonmanager.kubernetes.io/mode: Reconcile
spec:
  selector:
    matchLabels:
      k8s-app: kubernetes-dashboard
  template:
    metadata:
      labels:
        k8s-app: kubernetes-dashboard
      annotations:
        scheduler.alpha.kubernetes.io/critical-pod: ''
    spec:
      serviceAccountName: kubernetes-dashboard
      containers:
      - name: kubernetes-dashboard
        image: registry.cn-hangzhou.aliyuncs.com/kube_containers/kubernetes-dashboard-amd64:v1.8.1 
        resources:
          limits:
            cpu: 100m
            memory: 300Mi
          requests:
            cpu: 100m
            memory: 100Mi
        ports:
        - containerPort: 9090
          protocol: TCP
        livenessProbe:
          httpGet:
            scheme: HTTP
            path: /
            port: 9090
          initialDelaySeconds: 30
          timeoutSeconds: 30
      tolerations:
      - key: "CriticalAddonsOnly"
        operator: "Exists"

[root@k8s-master dashboard]# vim dashboard-rbac.yaml
[root@k8s-master dashboard]# cat dashboard-rbac.yaml
apiVersion: v1
kind: ServiceAccount
metadata:
  labels:
    k8s-app: kubernetes-dashboard
    addonmanager.kubernetes.io/mode: Reconcile
  name: kubernetes-dashboard
  namespace: kube-system
---

kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
  name: kubernetes-dashboard-minimal
  namespace: kube-system
  labels:
    k8s-app: kubernetes-dashboard
    addonmanager.kubernetes.io/mode: Reconcile
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: cluster-admin
subjects:
  - kind: ServiceAccount
    name: kubernetes-dashboard
    namespace: kube-system

[root@k8s-master dashboard]# vim dashboard-service.yaml
[root@k8s-master dashboard]# cat dashboard-service.yaml
apiVersion: v1
kind: Service
metadata:
  name: kubernetes-dashboard
  namespace: kube-system
  labels:
    k8s-app: kubernetes-dashboard
    kubernetes.io/cluster-service: "true"
    addonmanager.kubernetes.io/mode: Reconcile
spec:
  type: NodePort
  selector:
    k8s-app: kubernetes-dashboard
  ports:
  - port: 80
    targetPort: 9090

#创建
[root@k8s-master dashboard]# /opt/kubernetes/bin/kubectl create -f dashboard-rbac.yaml
[root@k8s-master dashboard]# /opt/kubernetes/bin/kubectl create -f dashboard-deployment.yaml
[root@k8s-master dashboard]# /opt/kubernetes/bin/kubectl create -f dashboard-service.yaml

#等待数分钟，查看资源状态
[root@k8s-master dashboard]# /opt/kubernetes/bin/kubectl get all -n kube-system

#查看访问端口
[root@k8s-master dashboard]# /opt/kubernetes/bin/kubectl get svc -n kube-system
NAME                   TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)         AGE
kubernetes-dashboard   NodePort    192.168.1.100           443:31209/TCP   1m

浏览器访192.168.1.22:31209测试