Kubernetes二进制安装步骤

程序员文章站 2022-03-12 12:36:36

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Kubernetes二进制安装步骤

部署环境
角色 IP 组件
k8s-master 134.0.84.110 kube-apiserver，kube-controller-manager，kube-scheduler，etcd
k8s-node1 134.0.84.103 kubelet，kube-proxy，docker，flannel，etcd
k8s-node2 134.0.84.104 kubelet，kube-proxy，docker，flannel，etcd

部署Etcd集群

使用cfssl来生成自签证书，先下载cfssl工具：
wget https://pkg.cfssl.org/R1.2/cfssl_linux-amd64
wget https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64
wget https://pkg.cfssl.org/R1.2/cfssl-certinfo_linux-amd64
chmod +x cfssl_linux-amd64 cfssljson_linux-amd64 cfssl-certinfo_linux-amd64
mv cfssl_linux-amd64 /usr/local/bin/cfssl
mv cfssljson_linux-amd64 /usr/local/bin/cfssljson
mv cfssl-certinfo_linux-amd64 /usr/bin/cfssl-certinfo

1.1 生成证书(master生成拷贝到node)
# cat ca-config.json
{
“signing”: {
“default”: {
“expiry”: “87600h”
},
“profiles”: {
“www”: {
“expiry”: “87600h”,
“usages”: [
“signing”,
“key encipherment”,
“server auth”,
“client auth”
]
}
}
}
}
EOF
# cat ca-csr.json
{
“CN”: “etcd CA”,
“key”: {
“algo”: “rsa”,
“size”: 2048
},
“names”: [
{
“C”: “CN”,
“L”: “Beijing”,
“ST”: “Beijing”
}
]
}
```
 # cat server-csr.json
 {
     "CN": "etcd",
     "hosts": [
     "134.0.84.110",
     "134.0.84.103",
     "134.0.84.104"
     ],
     "key": {
         "algo": "rsa",
         "size": 2048
     },
     "names": [
         {
             "C": "CN",
             "L": "BeiJing",
             "ST": "BeiJing"
         }
     ]
 }

 # cfssl gencert -initca ca-csr.json | cfssljson -bare ca -
 # cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=www server-csr.json | cfssljson -bare server
 # ls *pem
 # ca-key.pem  ca.pem  server-key.pem  server.pem
```
1.2 部署Etcd
二进制包下载地址：wget https://github.com/etcd-io/etcd/releases/download/v3.2.12/etcd-v3.2.12-linux-amd64.tar.gz
以下部署步骤在规划的三个etcd节点操作一样，唯一不同的是etcd配置文件中的服务器IP要写当前的：
解压二进制包：
# 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：
# cat /opt/etcd/cfg/etcd
#[Member]
ETCD_NAME=“etcd01” --etcd01，etcd02，etcd03
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS=“https://134.0.84.110:2380”
ETCD_LISTEN_CLIENT_URLS=“https://134.0.84.110:2379”
```
 #[Clustering]
 ETCD_INITIAL_ADVERTISE_PEER_URLS="https://134.0.84.110:2380"
 ETCD_ADVERTISE_CLIENT_URLS="https://134.0.84.110:2379"
 ETCD_INITIAL_CLUSTER="etcd01=https://134.0.84.110:2380,etcd02=https://134.0.84.103:2380,etcd03=https://134.0.84.104:2380"
 ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
 ETCD_INITIAL_CLUSTER_STATE="new"
 
 ETCD_NAME 节点名称
 ETCD_DATA_DIR 数据目录
 ETCD_LISTEN_PEER_URLS 集群通信监听地址
 ETCD_LISTEN_CLIENT_URLS 客户端访问监听地址
 ETCD_INITIAL_ADVERTISE_PEER_URLS 集群通告地址
 ETCD_ADVERTISE_CLIENT_URLS 客户端通告地址
 ETCD_INITIAL_CLUSTER 集群节点地址
 ETCD_INITIAL_CLUSTER_TOKEN 集群Token
 ETCD_INITIAL_CLUSTER_STATE 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：
# cat /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：
# cp capem serverpem /opt/etcd/ssl
启动并设置开启启动：
# systemctl start etcd
# systemctl enable etcd
都部署完成后，检查etcd集群状态：
# /opt/etcd/bin/etcdctl --ca-file=ca.pem --cert-file=server.pem --key-file=server-key.pem --endpoints=“https://134.0.84.110:2379,https://134.0.84.103:2379,https://134.0.84.104:2379” cluster-health
member 18218cfabd4e0dea is healthy: got healthy result from https://134.0.84.110:2379
member 541c1c40994c939b is healthy: got healthy result from https://134.0.84.103:2379
member a342ea2798d20705 is healthy: got healthy result from https://134.0.84.104:2379
cluster is healthy
如果输出上面信息，就说明集群部署成功。如果有问题第一步先看日志：/var/log/message 或 journalctl -u etcd
在Node安装Docker

在两台node节点分别执行：
# yum install -y yum-utils device-mapper-persistent-data lvm2
# yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
# yum install docker-ce -y
# curl -sSL https://get.daocloud.io/daotools/set_mirror.sh | sh -s http://bc437cce.m.daocloud.io
# systemctl start docker
# systemctl enable docker

3，安装flannel
在两台node节点上执行：
写入预定义子网段：
# cd /opt/etcd/ssl/
# /opt/etcd/bin/etcdctl --ca-file=ca.pem --cert-file=server.pem --key-file=server-key.pem --endpoints=“https://134.0.84.110:2379,https://134.0.84.103:2379,https://134.0.84.104:2379” set /coreos.com/network/config ‘{ “Network”: “172.17.0.0/16”, “Backend”: {“Type”: “vxlan”}}’
下载二进制包：
# wget https://github.com/coreos/flannel/releases/download/v0.10.0/flannel-v0.10.0-linux-amd64.tar.gz
# mkdir -p /opt/kubernetes/{bin,cfg,ssl}
# mv flanneld mk-docker-opts.sh /opt/kubernetes/bin
配置Flannel：
# vim /opt/kubernetes/cfg/flanneld
FLANNEL_OPTIONS="–etcd-endpoints=https://134.0.84.110:2379,https://134.0.84.103:2379,https://134.0.84.104:2379 -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：
# vim /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：
        # vim /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
    重启flannel和docker：
         systemctl daemon-reload
         systemctl start flanneld
         systemctl enable flanneld
         systemctl restart docker
    检查是否生效：
        node01网络信息:
            [[email protected] bin]# ifconfig flannel.1
            flannel.1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1450
                    inet 172.17.81.0  netmask 255.255.255.255  broadcast 0.0.0.0
                    inet6 fe80::3c54:39ff:fecd:1acf  prefixlen 64  scopeid 0x20<link>
                    ether 3e:54:39:cd:1a:cf  txqueuelen 0  (Ethernet)
                    RX packets 2  bytes 168 (168.0 B)
                    RX errors 0  dropped 0  overruns 0  frame 0
                    TX packets 2  bytes 228 (228.0 B)
                    TX errors 0  dropped 28 overruns 0  carrier 0  collisions 0

            [[email protected] bin]# ifconfig docker0
            docker0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
                    inet 172.17.81.1  netmask 255.255.255.0  broadcast 172.17.81.255
                    ether 02:42:7d:7e:e4:b3  txqueuelen 0  (Ethernet)
                    RX packets 0  bytes 0 (0.0 B)
                    RX errors 0  dropped 0  overruns 0  frame 0
                    TX packets 0  bytes 0 (0.0 B)
                    TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
        
        node02网络信息:
            [[email protected] bin]# ifconfig flannel.1
            flannel.1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1450
                    inet 172.17.94.0  netmask 255.255.255.255  broadcast 0.0.0.0
                    inet6 fe80::ec47:35ff:fee8:c5ba  prefixlen 64  scopeid 0x20<link>
                    ether ee:47:35:e8:c5:ba  txqueuelen 0  (Ethernet)
                    RX packets 2  bytes 168 (168.0 B)
                    RX errors 0  dropped 0  overruns 0  frame 0
                    TX packets 2  bytes 228 (228.0 B)
                    TX errors 0  dropped 29 overruns 0  carrier 0  collisions 0

            [[email protected] bin]#  ifconfig docker0
            docker0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
                    inet 172.17.94.1  netmask 255.255.255.0  broadcast 172.17.94.255
                    ether 02:42:08:cb:0b:f2  txqueuelen 0  (Ethernet)
                    RX packets 0  bytes 0 (0.0 B)
                    RX errors 0  dropped 0  overruns 0  frame 0
                    TX packets 0  bytes 0 (0.0 B)
                    TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
    确保docker0与flannel.1在同一网段。测试不同节点互通，在当前节点访问另一个Node节点docker0 IP：
        # ping 172.17.81.0
        # ping 172.17.81.1
        # ping 172.17.94.0
        # ping 172.17.94.1
        如果能通说明Flannel部署成功。如果不通检查下日志：journalctl -u flannel

在Master节点部署组件
4.1 生成证书
创建CA证书：
# cat ca-config.json
{
“signing”: {
“default”: {
“expiry”: “87600h”
},
“profiles”: {
“kubernetes”: {
“expiry”: “87600h”,
“usages”: [
“signing”,
“key encipherment”,
“server auth”,
“client auth”
]
}
}
}
}

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

     # cfssl gencert -initca ca-csr.json | cfssljson -bare ca -
     
 生成apiserver证书：
     # cat server-csr.json

{
“CN”: “kubernetes”,
“hosts”: [
“10.0.0.1”,
“134.0.84.110”,
“134.0.84.103”,
“134.0.84.104”,
“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”
}
]
}

        #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：

        # 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"
            }
          ]
        }

        # cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes kube-proxy-csr.json | cfssljson -bare kube-proxy
    
    最终生成以下证书文件：
        # ls *pem
            ca-key.pem  ca.pem  kube-proxy-key.pem  kube-proxy.pem  server-key.pem  server.pem
        # cp *.pem /opt/kubernetes/ssl/


4.2 部署apiserver组件
    下载二进制包：https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG-1.12.md，下载这个包（kubernetes-server-linux-amd64.tar.gz）就够了，包含了所需的所有组件。
        # mkdir /opt/kubernetes/{bin,cfg,ssl} -p
        # tar zxvf kubernetes-server-linux-amd64.tar.gz
        # cd kubernetes/server/bin
        # cp kube-apiserver kube-scheduler kube-controller-manager kubectl /opt/kubernetes/bin
    创建token文件，用途后面会讲到：
        # 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：
        # cat /opt/kubernetes/cfg/kube-apiserver
            KUBE_APISERVER_OPTS="--logtostderr=true \
            --v=4 \
            --etcd-servers=https://134.0.84.110:2379,https://134.0.84.103:2379,https://134.0.84.104:2379 \
            --bind-address=134.0.84.110 \
            --secure-port=6443 \
            --advertise-address=134.0.84.110 \
            --allow-privileged=true \
            --service-cluster-ip-range=10.0.0.0/24 \
            --enable-admission-plugins=NamespaceLifecycle,LimitRanger,SecurityContextDeny,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：
        # cat /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：
         systemctl daemon-reload
         systemctl enable kube-apiserver
         systemctl restart kube-apiserver

4.3 部署scheduler组件
    创建schduler配置文件：
        # 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：
        # cat /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：
         systemctl daemon-reload
         systemctl enable kube-scheduler
         systemctl restart kube-scheduler
        
4.4 部署controller-manager组件
    创建controller-manager配置文件：
        # 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=10.0.0.0/24 \
            --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：
        # cat /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：
         systemctl daemon-reload
         systemctl enable kube-controller-manager
         systemctl restart kube-controller-manager

所有组件都已经启动成功，通过kubectl工具查看当前集群组件状态：
# /opt/kubernetes/bin/kubectl get cs
NAME STATUS MESSAGE ERROR
controller-manager Healthy ok
etcd-1 Healthy {“health”: “true”}
etcd-2 Healthy {“health”: “true”}
scheduler Healthy ok
etcd-0 Healthy {“health”: “true”}
如上输出说明组件都正常。

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。

将kubernetes命令添加到系统变量
# vim /etc/profile
PATH=$PATH:/opt/kubernetes/bin/
# source /etc/profile

5.1 在master执行：将kubelet-bootstrap 用户绑定到系统集群角色
kubectl create clusterrolebinding kubelet-bootstrap --clusterrole=system:node-bootstrapper --user=kubelet-bootstrap
5.2 创建kubeconfig生成脚本
# cd /opt/kubernetes/ssl/
# vim kubeconfig.sh
# 创建kubelet bootstrapping kubeconfig
BOOTSTRAP_TOKEN=674c457d4dcf2eefe4920d7dbb6b0ddc
KUBE_APISERVER=“https://134.0.84.110:6443”

     # 设置集群参数
     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
     kubectl config set-credentials kubelet-bootstrap \
       --token=${BOOTSTRAP_TOKEN} \
       --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=./ca.pem \
       --embed-certs=true \
       --server=${KUBE_APISERVER} \
       --kubeconfig=kube-proxy.kubeconfig

     kubectl config set-credentials kube-proxy \
       --client-certificate=./kube-proxy.pem \
       --client-key=./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
 
 执行脚本
     [[email protected] kubernetesssl]# sh kubeconfig.sh
         Cluster "kubernetes" set.
         User "kubelet-bootstrap" set.
         Context "default" created.
         Switched to context "default".
         Cluster "kubernetes" set.
         User "kube-proxy" set.
         Context "default" created.
         Switched to context "default".
 将bootstrap.kubeconfig  kube-proxy.kubeconfig这两个文件拷贝到Node节点/opt/kubernetes/cfg目录下
     # scp bootstrap.kubeconfig kube-proxy.kubeconfig 134.0.84.103:/opt/kubernetes/cfg/
     # scp bootstrap.kubeconfig kube-proxy.kubeconfig 134.0.84.104:/opt/kubernetes/cfg/

5.2 部署kubelet组件

 在master服务器，将前下载的二进制包中的kubelet和kube-proxy拷贝到node服务器的/opt/kubernetes/bin目录下。
     # cd /opt/kubernetes/kubernetes/server/bin
     # scp kube-proxy kubelet 134.0.84.103:/opt/kubernetes/bin/
     # scp kube-proxy kubelet 134.0.84.104:/opt/kubernetes/bin/
 创建kubelet配置文件：
     [email protected]:/opt/kubernetes/cfg# cat /opt/kubernetes/cfg/kubelet
     KUBELET_OPTS="--logtostderr=true \
     --v=4 \
     --address=134.0.84.103 \
     --hostname-override=134.0.84.103 \
     --kubeconfig=/opt/kubernetes/cfg/kubelet.kubeconfig \
     --experimental-bootstrap-kubeconfig=/opt/kubernetes/cfg/bootstrap.kubeconfig \
     --cert-dir=/opt/kubernetes/ssl \
     --allow-privileged=true \
     --cluster-dns=8.8.8.8 \
     --cluster-domain=cluster.local \
     --fail-swap-on=false \
     --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
     # cat /opt/kubernetes/cfg/kubelet.config
 systemd管理kubelet组件：
     # cat /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：
      systemctl daemon-reload
      systemctl enable kubelet
      systemctl restart kubelet
     
 在Master审批Node加入集群：启动后还没加入到集群中，需要手动允许该节点才可以。在Master节点查看请求签名的Node：
     # kubectl get csr
         NAME                                                   AGE   REQUESTOR           CONDITION
         node-csr-5ekUr22JHk_mdPJiiuf8EOiTwDto1yuqxakXi4UYDyw   68s   kubelet-bootstrap   Pending

     # kubectl certificate approve node-csr-5ekUr22JHk_mdPJiiuf8EOiTwDto1yuqxakXi4UYDyw
     # kubectl get node
         NAME         STATUS   ROLES    AGE   VERSION
         134.0.84.103   Ready    <none>   15s   v1.12.1


 第二个节点做相同的操作，最终结果：
     [[email protected] bin]# kubectl get node
         NAME         STATUS   ROLES    AGE     VERSION
         134.0.84.103   Ready    <none>   7m37s   v1.12.1
         134.0.84.104   Ready    <none>   14s     v1.12.1

5.3 部署kube-proxy组件
创建kube-proxy配置文件：
# cat /opt/kubernetes/cfg/kube-proxy
KUBE_PROXY_OPTS="–logtostderr=true
–v=4
–hostname-override=134.0.84.103
–cluster-cidr=10.0.0.0/24
–kubeconfig=/opt/kubernetes/cfg/kube-proxy.kubeconfig"

systemd管理kube-proxy组件：
    # cat /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：
         systemctl daemon-reload
         systemctl enable kube-proxy
         systemctl restart kube-proxy

查看集群状态
[[email protected] ~]# kubectl get node
NAME STATUS ROLES AGE VERSION
134.0.84.103 Ready 14m v1.12.1
134.0.84.104 Ready 7m26s v1.12.1
[[email protected] ~]# kubectl get node
NAME STATUS ROLES AGE VERSION
134.0.84.103 Ready 14m v1.12.1
134.0.84.104 Ready 7m29s v1.12.1
[[email protected] ~]# kubectl get cs
NAME STATUS MESSAGE ERROR
controller-manager Healthy ok
scheduler Healthy ok
etcd-1 Healthy {“health”: “true”}
etcd-2 Healthy {“health”: “true”}
etcd-0 Healthy {“health”: “true”}
运行一个测试示例
创建一个Nginx Web，测试集群是否正常工作：
[[email protected] ~]# kubectl run nginx --image=nginx --replicas=3
kubectl run --generator=deployment/apps.v1beta1 is DEPRECATED and will be removed in a future version. Use kubectl create instead.
deployment.apps/nginx created
[[email protected] ~]# kubectl expose deployment nginx --port=88 --target-port=80 --type=NodePort
service/nginx exposed
[[email protected] ~]# kubectl get pods
NAME READY STATUS RESTARTS AGE
nginx-dbddb74b8-7bm6j 0/1 ContainerCreating 0 17s
nginx-dbddb74b8-qw7sv 0/1 ContainerCreating 0 17s
nginx-dbddb74b8-w77q8 0/1 ContainerCreating 0 17s

[[email protected] ~]# kubectl get pods
NAME READY STATUS RESTARTS AGE
nginx-dbddb74b8-7bm6j 1/1 Running 0 51s
nginx-dbddb74b8-qw7sv 1/1 Running 0 51s
nginx-dbddb74b8-w77q8 1/1 Running 0 51s

[[email protected] ~]# kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.0.0.1 443/TCP 102m
nginx NodePort 10.0.0.215 88:48603/TCP 68s

访问集群中部署的Nginx，打开浏览器输入：http://134.0.84.104:48603/
无法查看pod运行日志

[[email protected] ~]# kubectl logs nginx-dbddb74b8-7bm6j
Error from server (Forbidden): Forbidden (user=system:anonymous, verb=get, resource=nodes, subresource=proxy) ( pods/log nginx-dbddb74b8-7bm6j)

解决方法：
# kubectl create clusterrolebinding cluster-system-anonymous --clusterrole=cluster-admin --user=system:anonymous
问题解决：
[[email protected] ~]# kubectl logs nginx-dbddb74b8-7bm6j
172.17.94.0 - - [19/Apr/2019:08:16:19 +0000] “GET / HTTP/1.1” 200 612 “-” “Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.92 Safari/537.36” “-”
2019/04/19 08:16:19 [error] 6#6: *2 open() “/usr/share/nginx/html/favicon.ico” failed (2: No such file or directory), client: 172.17.94.0, server: localhost, request: “GET /favicon.ico HTTP/1.1”, host: “134.0.84.104:48603”, referrer: “http://134.0.84.104:48603/”
172.17.94.0 - - [19/Apr/2019:08:16:19 +0000] “GET /favicon.ico HTTP/1.1” 404 556 “http://134.0.84.104:48603/” “Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.92 Safari/537.36” “-”

部署kubernetes-dashboard
下载dashboard.yaml文件
wget https://raw.githubusercontent.com/kubernetes/dashboard/master/aio/deploy/recommended/kubernetes-dashboard.yaml

修改配置文件：

kubernetes-dashboard.yaml

 1，修改nodePort，修改后如下：
     # ------------------- Dashboard Service ------------------- #
     kind: Service
     apiVersion: v1
     metadata:
       labels:
         k8s-app: kubernetes-dashboard
       name: kubernetes-dashboard
       namespace: kube-system
     spec:
       type: NodePort
       ports:
         - port: 443
           targetPort: 8443
           nodePort: 30001
       selector:
         k8s-app: kubernetes-dashboard
 2，修改镜像地址：image: registry.cn-beijing.aliyuncs.com/mine-k8s/kubernetes-dashboard-amd64:v1.10.1   默认为国外地址，无法访问。

安装kubernetes-dashboard
# kubectl create -f kubernetes-dashboard.yaml

默认kubernetes-dashboard用户权限非常低，登录时会报错：需要创建一个高权限的用户
warning
configmaps is forbidden: User “system:serviceaccount:kube-system:kubernetes-dashboard” cannot list configmaps in the namespace “default”
close
warning
persistentvolumeclaims is forbidden: User “system:serviceaccount:kube-system:kubernetes-dashboard” cannot list persistentvolumeclaims in the namespace “default”
close
warning
secrets is forbidden: User “system:serviceaccount:kube-system:kubernetes-dashboard” cannot list secrets in the namespace “default”
close
warning
……
解决办法：
1.添加serviceaccount账户，设置并使其可登陆
apiVersion: v1
kind: ServiceAccount
metadata:
name: aks-dashboard-admin
namespace: kube-system
—
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: aks-dashboard-admin
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: cluster-admin
subjects:
- kind: ServiceAccount
name: aks-dashboard-admin
namespace: kube-system
2.创建完全管理权限
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRoleBinding
metadata:
name: kubernetes-dashboard
labels:
k8s-app: kubernetes-dashboard
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: cluster-admin
subjects:
- kind: ServiceAccount
name: kubernetes-dashboard
namespace: kube-system

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

查看tocken
# kubectl -n kube-system describe secret $(kubectl -n kube-system get secret | grep admin-user | awk ‘{print $1}’)

 用户名：
     aks-dashboard-admin-token-wdkj6
 token：
     eyJhbGciOiJSUzI1NiIsImtpZCI6IiJ9.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.yBDoEskovx1nnw9wbsI8_W4AxRtEW_jcnSqI2R2R1asOWFZxbv2MUrB_z_fhsfZ4Xf44p8ZVE8Y6ELRYRT6U_OF00owxB_SntGiqetpzBWVWknVmruMazeJUyAjgFaFvkI_rL1yMbogvhhJlNNzLqU-nzQ40iXdzL8-fig_7EqtnA7XJa5s9Suo_vZGM-ypdUVMc120m8qINb1-y2NUu_ipLa-sKaJMLLnxx7mNeQZqI44uFicynSqfOwkwSlljCLyl8O9rt-OiIRLh6rIAKkzEosrlKVUbds1tC2KZ_g7DiUM9O5prKtKlIVkpNWivNS-VPb_6E9mgvZbZRQavAiw

打开登录页面；
注意：谷歌新版本浏览器无法打开kubernetes-dashboard的WEB-UI。需要使用火狐浏览器。
https://134.0.84.103:30001
输入上一步查到的tocken，即可登录

其它命令：

查看pod日志
    # kubectl -n kube-system logs kubernetes-dashboard-7dcf6b77f7-mbnxc
删除pod
    [[email protected] dashboard]# kubectl delete -f dashboard-controller.yaml

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