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【赵渝强】使用二进制包部署Kubernetes集群

赵渝强老师
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在一些企业的私有环境中可能无法连接外部的网络。如果要在这样的环境中部署Kubernetes集群,可以采集Kubernetes离线安装的方式进行部署。即:使用二进制安装包部署Kubernetes集群,采用的版本是Kubernetes v1.18.20。

下面通过具体的步骤来演示如何使用二进制包部署三个节点的Kubernetes集群。
图片描述

1. 部署ETCD

(1)从GitHub上下载ETCD的二进制安装包“etcd-v3.3.27-linux-amd64.tar.gz”。

(2)从cfssl官方网站上下载所需要的介质,并安装cfssl。

chmod +x cfssl_linux-amd64 cfssljson_linux-amd64
mv cfssl_linux-amd64 /usr/local/bin/cfssl
mv cfssljson_linux-amd64 /usr/local/bin/cfssljson

提示: cfssl是一个命令行工具包,该工具包包含了运行一个认证中心所需要的全部功能。

(3)创建用于生成CA证书和私钥的配置文件,执行下面的命令:

mkdir -p /opt/ssl/etcd
cd /opt/ssl/etcd
cfssl print-defaults config > config.json
cfssl print-defaults csr > csr.json

cat > config.json <<EOF
{
  "signing": {
    "default": {
      "expiry": "87600h"
    },
    "profiles": {
      "kubernetes": {
        "usages": [
            "signing",
            "key encipherment",
            "server auth",
            "client auth"
        ],
        "expiry": "87600h"
      }
    }
  }
}
EOF

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

(4)生成CA证书和私钥。

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

(5)在目录“/opt/ssl/etcd”下添加文件“etcd-csr.json”,该文件用于生成ETCD的证书和私钥,内容如下:

cat > etcd-csr.json <<EOF
{
  "CN": "etcd",
  "hosts": [
    "192.168.79.11"
  ],
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "ST": "BeiJing",
      "L": "BeiJing",
      "O": "etcd",
      "OU": "Etcd Security"
    }
  ]
}
EOF

提示: 这里只部署了一个ETCD的节点。如果是部署ETCD集群,可以修改字段“hosts”添加多个ETCD节点即可。

(6)安装ETCD。

tar -zxvf etcd-v3.3.27-linux-amd64.tar.gz
cd etcd-v3.3.27-linux-amd64
cp etcd* /usr/local/bin
mkdir -p /opt/platform/etcd/

(7)编辑文件“/opt/platform/etcd/etcd.conf”添加ETCD的配置信息,内容如下:

ETCD_NAME=k8s-etcd
ETCD_DATA_DIR="/var/lib/etcd/k8s-etcd"
ETCD_LISTEN_PEER_URLS="http://192.168.79.11:2380"
ETCD_LISTEN_CLIENT_URLS="http://127.0.0.1:2379,http://192.168.79.11:2379"
ETCD_INITIAL_ADVERTISE_PEER_URLS="http://192.168.79.11:2380"
ETCD_INITIAL_CLUSTER="k8s-etcd=http://192.168.79.11:2380"
ETCD_INITIAL_CLUSTER_STATE="new"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-test"
ETCD_ADVERTISE_CLIENT_URLS="http://192.168.79.11:2379"

(8)将ETCD服务加入系统服务中,编辑文件“/usr/lib/systemd/system/etcd.service”内容如下:

[Unit]
Description=Etcd Server
After=network.target
After=network-online.target
Wants=network-online.target

[Service]
Type=notify
EnvironmentFile=/opt/platform/etcd/etcd.conf
ExecStart=/usr/local/bin/etcd \
--cert-file=/opt/ssl/etcd/etcd.pem \
--key-file=/opt/ssl/etcd/etcd-key.pem \
--peer-cert-file=/opt/ssl/etcd/etcd.pem \
--peer-key-file=/opt/ssl/etcd/etcd-key.pem \
--trusted-ca-file=/opt/ssl/etcd/etcd.pem \
--peer-trusted-ca-file=/opt/ssl/etcd/etcd.pem
Restart=on-failure
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target

(9)创建ETCD的数据存储目录,然后启动ETCD服务。

mkdir -p /opt/platform/etcd/data
chmod 755 /opt/platform/etcd/data
systemctl daemon-reload
systemctl enable etcd.service
systemctl start etcd.service

(10)验证ETCD的状态。

etcdctl cluster-health

输出信息如下:

member fd4d0bd2446259d9 is healthy: 
got healthy result from http://192.168.79.11:2379
cluster is healthy

(11)查看ETCD的成员列表。

etcdctl member list

输出的信息如下:

fd4d0bd2446259d9: name=k8s-etcd peerURLs=http://192.168.79.11:2380 clientURLs=http://192.168.79.11:2379 isLeader=true

提示: 由于是单节点的ETCD,因此这里只有一个成员信息。

(12)将ETCD的证书文件拷贝的node1和node2节点上。

cd /opt
scp -r ssl/ root@node1:/opt
scp -r ssl/ root@node2:/opt

2. 部署Flannel网络

(1)在master节点上写入分配的子网段到ETCD中供Flannel使用,执行命令:

etcdctl set /coreos.com/network/config '{ "Network": "172.17.0.0/16", "Backend": {"Type": "vxlan"}}'

(2)在master节点上查看写的Flannel子网信息,执行命令:

etcdctl get /coreos.com/network/config

输出的信息如下:

{ "Network": "172.17.0.0/16", "Backend": {"Type": "vxlan"}}

(3)在node1上解压flannel-v0.10.0-linux-amd64.tar.gz安装包,执行命令:

tar -zxvf flannel-v0.10.0-linux-amd64.tar.gz

(4)在node1上创建Kubernetes工作目录。

mkdir -p /opt/kubernetes/{cfg,bin,ssl}
mv mk-docker-opts.sh flanneld /opt/kubernetes/bin/

(5)在node1上定义Flannel脚本文件“flannel.sh”,输入下面的内容:

#!/bin/bash
ETCD_ENDPOINTS=${1}

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

cat <<EOF >/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
EOF

systemctl daemon-reload
systemctl enable flanneld
systemctl restart flanneld

(6)在node1节点上开启Flannel网络功能,执行命令:

bash flannel.sh http://192.168.79.11:2379

提示: 这里指定了在master节点上部署的ETCD地址。

(7)在node1节点上查看Flannel网络的状态,执行命令:

systemctl status flanneld

输出的信息如下:

flanneld.service - Flanneld overlay address etcd agent
 Loaded: loaded (/usr/lib/systemd/system/flanneld.service; enabled; vendor preset: disabled)
 Active: active (running) since Tue 2022-02-08 22:30:46 CST; 6s ago

(8)在node1节点上修改文件“/usr/lib/systemd/system/docker.service”配置node1节点上的Docker连接Flannel网络,在文件中增加下面的一行:

... ...
EnvironmentFile=/run/flannel/subnet.env
... ...

(9)在node1节点上重启Docker服务。

systemctl daemon-reload 
systemctl restart docker.service 

(10)查看node1节点上的Flannel网络信息,如图13-3所示:

ifconfig

在这里插入图片描述

(11)在node2节点上配置Flannel网络,重复第3步到第10步。

3. 部署Master节点

(1)创建Kubernetes集群证书目录。

mkdir -p /opt/ssl/k8s
cd /opt/ssl/k8s

(2)创建脚本文件“k8s-cert.sh”用于生成Kubernetes集群的证书,在脚本中输入下面的内容:

cat > ca-config.json <<EOF
{
  "signing": {
    "default": {
      "expiry": "87600h"
    },
    "profiles": {
      "kubernetes": {
        "usages": [
            "signing",
            "key encipherment",
            "server auth",
            "client auth"
        ],
        "expiry": "87600h"
      }
    }
  }
}
EOF

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

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

cat >server-csr.json<<EOF
{
  "CN": "kubernetes",
  "hosts": [
     "192.168.79.11",
     "127.0.0.1",
     "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": "system:masters",
      "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

(3)执行脚本文件“k8s-cert.sh”。

bash k8s-cert.sh

(4)拷贝证书。

mkdir -p /opt/kubernetes/ssl/
mkdir -p /opt/kubernetes/logs/
cp ca*pem server*pem /opt/kubernetes/ssl/

(5))解压kubernetes压缩包

tar -zxvf kubernetes-server-linux-amd64.tar.gz 

(6)复制关键命令文件

mkdir -p /opt/kubernetes/bin/
cd kubernetes/server/bin/
cp kube-apiserver kube-scheduler kube-controller-manager \
   /opt/kubernetes/bin
cp kubectl /usr/local/bin/

(7)随机生成序列号。

mkdir -p /opt/kubernetes/cfg
head -c 16 /dev/urandom | od -An -t x | tr -d ' '

输出内容如下:

05cd8031b0c415de2f062503b0cd4ee6

(8)创建“/opt/kubernetes/cfg/token.csv”文件,输入下面的内容:

05cd8031b0c415de2f062503b0cd4ee6,kubelet-bootstrap,10001,"system:node-bootstrapper"

(9)创建API Server的配置文件“/opt/kubernetes/cfg/kube-apiserver.conf”,输入下面的内容:

KUBE_APISERVER_OPTS="--logtostderr=false \
--v=2 \
--log-dir=/opt/kubernetes/logs \
--etcd-servers=http://192.168.79.11:2379 \
--bind-address=192.168.79.11 \
--secure-port=6443 \
--advertise-address=192.168.79.11 \
--allow-privileged=true \
--service-cluster-ip-range=10.0.0.0/24 \
--enable-admission-plugins=NamespaceLifecycle,LimitRanger,ServiceAccount,ResourceQuota,NodeRestriction \
--authorization-mode=RBAC,Node \
--enable-bootstrap-token-auth=true \
--token-auth-file=/opt/kubernetes/cfg/token.csv \
--service-node-port-range=30000-32767 \
--kubelet-client-certificate=/opt/kubernetes/ssl/server.pem \
--kubelet-client-key=/opt/kubernetes/ssl/server-key.pem \
--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/ssl/etcd/etcd.pem \
--etcd-certfile=/opt/ssl/etcd/etcd.pem \
--etcd-keyfile=/opt/ssl/etcd/etcd-key.pem \
--audit-log-maxage=30 \
--audit-log-maxbackup=3 \
--audit-log-maxsize=100 \
--audit-log-path=/opt/kubernetes/logs/k8s-audit.log"

(10)使用系统的systemd来管理API Server,执行命令:

cat > /usr/lib/systemd/system/kube-apiserver.service << EOF
[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/kubernetes/kubernetes
[Service]
EnvironmentFile=/opt/kubernetes/cfg/kube-apiserver.conf
ExecStart=/opt/kubernetes/bin/kube-apiserver \$KUBE_APISERVER_OPTS
Restart=on-failure
[Install]
WantedBy=multi-user.target
EOF

(11)启动API Server。

systemctl daemon-reload
systemctl start kube-apiserver
systemctl enable kube-apiserver

(12)查看API Server的状态。

systemctl status kube-apiserver.service

输出的信息如下:

kube-apiserver.service - Kubernetes API Server
Loaded: loaded (/usr/lib/systemd/system/kube-apiserver.service; enabled; vendor preset: disabled)
Active: active (running) since Tue 2022-02-08 21:11:47 CST; 24min ago

(13)查看监听的端口6433和端口8080信息,如图13-4所示。

netstat -ntap | grep 6443
netstat -ntap | grep 8080

在这里插入图片描述

(14)授权kubelet-bootstrap用户允许请求证书。

kubectl create clusterrolebinding kubelet-bootstrap \
--clusterrole=system:node-bootstrapper \
--user=kubelet-bootstrap

(15)创建kube-controller-manager的配置文件,执行命令:

cat > /opt/kubernetes/cfg/kube-controller-manager.conf << EOF
KUBE_CONTROLLER_MANAGER_OPTS="--logtostderr=false \
--v=2 \
--log-dir=/opt/kubernetes/logs \
--leader-elect=true \
--master=127.0.0.1:8080 \
--bind-address=127.0.0.1 \
--allocate-node-cidrs=true \
--cluster-cidr=10.244.0.0/16 \
--service-cluster-ip-range=10.0.0.0/24 \
--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 \
--experimental-cluster-signing-duration=87600h0m0s"
EOF

(16)使用systemd服务来管理kube-controller-manager,执行命令

cat > /usr/lib/systemd/system/kube-controller-manager.service << EOF
[Unit]
Description=Kubernetes Controller Manager
Documentation=https://github.com/kubernetes/kubernetes
[Service]
EnvironmentFile=/opt/kubernetes/cfg/kube-controller-manager.conf
ExecStart=/opt/kubernetes/bin/kube-controller-manager \$KUBE_CONTROLLER_MANAGER_OPTS
Restart=on-failure
[Install]
WantedBy=multi-user.target
EOF

(17)启动kube-controller-manager。

systemctl daemon-reload
systemctl start kube-controller-manager
systemctl enable kube-controller-manager

(18)查看kube-controller-manager的状态。

systemctl status kube-controller-manager

输出的信息如下:

kube-controller-manager.service - Kubernetes Controller Manager
Loaded: loaded (/usr/lib/systemd/system/kube-controller-manager.service; enabled; vendor preset: disabled)
Active: active (running) since Tue 2022-02-08 20:42:08 CST; 1h 2min ago

(19)创建kube-scheduler的配置文件,执行命令:

cat > /opt/kubernetes/cfg/kube-scheduler.conf << EOF
KUBE_SCHEDULER_OPTS="--logtostderr=false \
--v=2 \
--log-dir=/opt/kubernetes/logs \
--leader-elect \
--master=127.0.0.1:8080 \
--bind-address=127.0.0.1"
EOF

(20)使用systemd服务来管理kube-scheduler,执行命令:

cat > /usr/lib/systemd/system/kube-scheduler.service << EOF
[Unit]
Description=Kubernetes Scheduler
Documentation=https://github.com/kubernetes/kubernetes
[Service]
EnvironmentFile=/opt/kubernetes/cfg/kube-scheduler.conf
ExecStart=/opt/kubernetes/bin/kube-scheduler \$KUBE_SCHEDULER_OPTS
Restart=on-failure
[Install]
WantedBy=multi-user.target
EOF

(21)启动kube-scheduler。

systemctl daemon-reload
systemctl start kube-scheduler
systemctl enable kube-scheduler

(22)查看kube-scheduler的状态。

systemctl status kube-scheduler.service

输出的信息如下:

kube-scheduler.service - Kubernetes Scheduler
 Loaded: loaded (/usr/lib/systemd/system/kube-scheduler.service; enabled; vendor preset: disabled)
 Active: active (running) since Tue 2022-02-08 20:43:01 CST; 1h 8min ago

(23)查看master节点的状态信息。

kubectl get cs

输出的信息如下:

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

4. 部署Node节点

(1)在master节点上创建脚本文件“kubeconfig”,输入下面的内容:

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
# 注意这里的token ID需要与token.csv文件中的ID一致。
kubectl config set-credentials kubelet-bootstrap \
  --token=05cd8031b0c415de2f062503b0cd4ee6 \
  --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

(2)执行脚本文件“kubeconfig”。

bash kubeconfig 192.168.79.11 /opt/ssl/k8s/

输出的信息如下:

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".

(3)将master节点上生成的配置文件拷贝到node1节点和node2节点。

scp bootstrap.kubeconfig kube-proxy.kubeconfig \
root@node1:/opt/kubernetes/cfg/

scp bootstrap.kubeconfig kube-proxy.kubeconfig \
root@node2:/opt/kubernetes/cfg/

(4)在node1节点上解压文件“kubernetes-node-linux-amd64.tar.gz”。

tar -zxvf kubernetes-node-linux-amd64.tar.gz

(5)在node1节点上将kubelet和kube-proxy复制到目录“/opt/kubernetes/bin/”下。

cd kubernetes/node/bin/
cp kubelet kube-proxy /opt/kubernetes/bin/

(6)在node1节点上创建脚本文件“kubelet.sh”,输入下面的内容:

#!/bin/bash

NODE_ADDRESS=$1
DNS_SERVER_IP=${2:-"10.0.0.2"}

cat <<EOF >/opt/kubernetes/cfg/kubelet

KUBELET_OPTS="--logtostderr=true \\
--v=4 \\
--hostname-override=${NODE_ADDRESS} \\
--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"

EOF

cat <<EOF >/opt/kubernetes/cfg/kubelet.config

kind: KubeletConfiguration
apiVersion: kubelet.config.k8s.io/v1beta1
address: ${NODE_ADDRESS}
port: 10250
readOnlyPort: 10255
cgroupDriver: systemd
clusterDNS:
- ${DNS_SERVER_IP} 
clusterDomain: cluster.local.
failSwapOn: false
authentication:
  anonymous:
    enabled: true
EOF

cat <<EOF >/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
EOF

systemctl daemon-reload
systemctl enable kubelet
systemctl restart kubelet

(7)在node1节点上执行脚本文件“kubelet.sh”。

bash kubelet.sh 192.168.79.12

提示: 这里指定的node1节点的IP地址。

(8)在node1节点上查看Kubelet的状态。

systemctl status kubelet

输出的信息如下:

kubelet.service - Kubernetes Kubelet Loaded: loaded
(/usr/lib/systemd/system/kubelet.service; enabled; vendor preset:
disabled) Active: active (running) since Tue 2022-02-08 23:23:52 CST;
3min 18s ago

(9)在node1节点上创建脚本文件“proxy.sh”,输入下面的内容

#!/bin/bash

NODE_ADDRESS=$1

cat <<EOF >/opt/kubernetes/cfg/kube-proxy

KUBE_PROXY_OPTS="--logtostderr=true \\
--v=4 \\
--hostname-override=${NODE_ADDRESS} \\
--cluster-cidr=10.0.0.0/24 \\
--proxy-mode=ipvs \\
--kubeconfig=/opt/kubernetes/cfg/kube-proxy.kubeconfig"

EOF

cat <<EOF >/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
EOF

systemctl daemon-reload
systemctl enable kube-proxy
systemctl restart kube-proxy

(10)在node1节点上执行脚本文件“proxy.sh”。

bash proxy.sh 192.168.79.12

(11)在node1节点上查看kube-proxy的状态。

systemctl status kube-proxy.service

输出的信息如下:

kube-proxy.service - Kubernetes Proxy
 Loaded: loaded (/usr/lib/systemd/system/kube-proxy.service; enabled; vendor preset: disabled)
 Active: active (running) since Tue 2022-02-08 23:30:51 CST; 9s ago

(12)在master节点上检查node1节点加入集群的请求信息,执行命令:

kubectl get csr

输出的信息如下:

NAME                                                 ... CONDITION
node-csr-Qc2wKIo6AIWh6AXKW6tNwAvUqpxEIXFPHkkIe1jzSBE ... Pending

(13)在master节点上批准node1节点的请求,执行命令:

kubectl certificate approve \
node-csr-Qc2wKIo6AIWh6AXKW6tNwAvUqpxEIXFPHkkIe1jzSBE

(14)在master节点上查看Kubernetes集群中的节点信息,执行命令:

kubectl get node

输出的信息如下:

NAME            STATUS   ROLES    AGE   VERSION
192.168.79.12   Ready    <none>   85s   v1.18.20

提示: 这时候node1节点已经成功加入了Kubernetes集群中。

(15)在node2节点上重复第4步到第14步,按照同样的方法把node2节点加入集群。
(16)在master节点上查看Kubernetes集群中的节点信息,执行命令:

kubectl get node

输出的信息如下:

NAME             STATUS   ROLES     AGE     VERSION
192.168.79.12   Ready    <none>   5m47s   v1.18.20
192.168.79.13   Ready    <none>   11s     v1.18.20

至此便成功使用二进制包部署了三个节点的Kubernetes集群。

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