二进制方式安装搭建k8s集群

使用三台服务器搭建k8s集群，集群服务器地址规划如下：

IP	hostname	备注
192.168.206.128	master	主节点
192.168.206.129	node1	从节点
192.168.206.130	node2	从节点

1.环境配置

1.1 修改主机名

master:

hostnamectl set-hostname master

node1:

hostnamectl set-hostname node1

node2:

hostnamectl set-hostname

1.2 关闭防火墙（all）

systemctl stop firewalld
systemctl disable firewalld

1.3 关闭selinux（all）

setenforce 0 # 临时关闭
sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config # 永久关闭

1.4 关闭swap（all）

swapoff -a # 临时关闭；关闭swap主要是为了性能考虑
sed -ri 's/.*swap.*/#&/' /etc/fstab
free # 查看内存，swap为0则为关闭

1.5 将桥接的IPv4流量传递到iptables的链（all）

cat > /etc/sysctl.d/k8s.conf << EOF
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF

sysctl --system

1.6 添加主机名与IP对应的关系 ( master )

cat >> /etc/hosts << EOF 
192.168.206.128 master
192.168.206.129 node1
192.168.206.130 node2
EOF

2.准备 cfssl 证书生成工具 ( master )

cfssl 是一个开源的证书管理工具，使用 json 文件生成证书，相比 openssl 更方便使用。 找任意一台服务器操作，这里用 Master 节点。

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
chmod +x /usr/bin/cfssl*

2.1 生成 Etcd 证书 （1）自签证书颁发机构（CA） 创建工作目录

mkdir -p ~/TLS/{etcd,k8s}

cd TLS/etcd

2.2 自签CA

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

cat > ca-csr.json << EOF
{
    "CN": "etcd CA",
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "L": "Beijing",
            "ST": "Beijing"
        }
    ]
}
EOF

2.3 生成CA证书

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

[root@master etcd]# ls ca*pem  #查看
ca-key.pem  ca.pem

2.4 使用自签 CA 签发 Etcd HTTPS 证书 创建证书申请文件：(修改对应的master和node的IP地址)

cat > server-csr.json << EOF
{
    "CN": "etcd",
    "hosts": [
    "192.168.206.128",
    "192.168.206.129",
    "192.168.206.130"
    ],
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "L": "BeiJing",
            "ST": "BeiJing"
        }
    ]
}
EOF

2.5 生成SERVER证书

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

[root@master etcd]# ls server*pem  #查看
server-key.pem  server.pem

3.部署etcd集群

3.1 下载

下载地址：https://github.com/etcd-io/etcd/releases
版本：3.4.14

以下在master 上操作，为简化操作，完成后将master 生成的所有文件拷贝到node1 和node2。

3.2 创建工作目录并解压二进制包

mkdir /opt/etcd/{bin,cfg,ssl} -p
tar zxvf etcd-v3.4.14-linux-amd64.tar.gz
mv etcd-v3.4.14-linux-amd64/{etcd,etcdctl} /opt/etcd/bin/

3.3 创建etcd.conf

cat > /opt/etcd/cfg/etcd.conf << EOF
#[Member]
ETCD_NAME="etcd-1"
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://192.168.206.128:2380"
ETCD_LISTEN_CLIENT_URLS="https://192.168.206.128:2379"
#[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.206.128:2380"
ETCD_ADVERTISE_CLIENT_URLS="https://192.168.206.128:2379"
ETCD_INITIAL_CLUSTER="etcd-1=https://192.168.206.128:2380,etcd-2=https://192.168.206.129:2380,etcd-3=https://192.168.206.130:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"
EOF

• ETCD_NAME：节点名称，集群中唯一
• 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

3.4 创建etcd.service

cat > /usr/lib/systemd/system/etcd.service << EOF
[Unit]
Description=Etcd Server
After=network.target
After=network-online.target
Wants=network-online.target
[Service]
Type=notify
EnvironmentFile=/opt/etcd/cfg/etcd.conf
ExecStart=/opt/etcd/bin/etcd \
--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 \
--logger=zap
Restart=on-failure
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
EOF

3.5 拷贝上一步生成的证书到配置路径

cp ~/TLS/etcd/ca*pem ~/TLS/etcd/server*pem /opt/etcd/ssl/

3.6 将master 生成的所有文件拷贝到node1 和node2

scp -r /opt/etcd/ root@192.168.206.129:/opt/
scp /usr/lib/systemd/system/etcd.service root@192.168.206.129:/usr/lib/systemd/system/

scp -r /opt/etcd/ root@192.168.206.130:/opt/
scp /usr/lib/systemd/system/etcd.service root@192.168.206.130:/usr/lib/systemd/system/

分别修改 etcd.conf 配置文件中的节点名称和当前服务器 IP：(node1改为 etcd-2，node2 改为 etcd-3)

3.7 启动并设置开机启动

# 三台同时执行
systemctl daemon-reload
systemctl start etcd
systemctl enable etcd

查看状态：

/opt/etcd/bin/etcdctl --cacert=/opt/etcd/ssl/ca.pem --cert=/opt/etcd/ssl/server.pem --key=/opt/etcd/ssl/server-key.pem --endpoints="https://192.168.206.128:2379,https://192.168.206.129:2379,https://192.168.206.130:2379" endpoint health
#可视化展示
/opt/etcd/bin/etcdctl --cacert=/opt/etcd/ssl/ca.pem --cert=/opt/etcd/ssl/server.pem --key=/opt/etcd/ssl/server-key.pem --endpoints="https://192.168.206.128:2379,https://192.168.206.129:2379,https://192.168.206.130:2379" endpoint status --write-out=table

4.安装docker（all）

4.1 下载

下载地址：https://download.docker.com/linux/static/stable/x86_64/
版本：19.03.9

4.2 解压及安装

tar zxvf docker-19.03.9.tgz 
mv docker/* /usr/bin

4.3 systemd 管理 docker

cat > /usr/lib/systemd/system/docker.service << EOF
[Unit]
Description=Docker Application Container Engine
Documentation=https://docs.docker.com
After=network-online.target firewalld.service
Wants=network-online.target
[Service]
Type=notify
ExecStart=/usr/bin/dockerd
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
EOF

4.4 配置阿里云加速

mkdir /etc/docker
cat > /etc/docker/daemon.json << EOF
{
  "registry-mirrors": ["https://b9pmyelo.mirror.aliyuncs.com"]
}
EOF

4.5 启动并设置开机启动

systemctl daemon-reload
systemctl start docker
systemctl enable docker

4.6 查询是否安装成功

[root@master etcd]# docker -v
Docker version 19.03.9, build 9d988398e7

5.部署Master Node（master）

5.1 生成 kube-apiserver 证书 自签证书颁发机构（CA）

cd TLS/k8s

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

5.2 生成CA证书

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

[root@master k8s]# ls ca*pem  #查看
ca-key.pem  ca.pem

5.3 使用自签 CA 签发 kube-apiserver HTTPS 证书 创建证书申请文件

cat > server-csr.json << EOF
{
    "CN": "kubernetes",
    "hosts": [
      "10.0.0.1",
      "127.0.0.1",
      "192.168.206.128",
      "192.168.206.129",
      "192.168.206.130",
      "192.168.206.131",
      "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

注：192.168.206.131为预留出的IP。

5.4 生成SERVER证书

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

[root@master k8s]# ls server*pem  #查看
server-key.pem  server.pem

5.5 下载k8s安装包并解压

下载地址：https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG/CHANGELOG-1.18.md#server-binaries
版本：1.18.20 (压缩包名：kubernetes-server-linux-amd64.tar.gz)

mkdir -p /opt/kubernetes/{bin,cfg,ssl,logs}
tar zxvf kubernetes-server-linux-amd64.tar.gz
cd kubernetes/server/bin
cp kube-apiserver kube-scheduler kube-controller-manager /opt/kubernetes/bin
cp kubectl /usr/bin/

5.6 部署kube-apiserver

cat > /opt/kubernetes/cfg/kube-apiserver.conf << EOF
KUBE_APISERVER_OPTS="--logtostderr=false \\
--v=2 \\
--log-dir=/opt/kubernetes/logs \\
--etcd-servers=https://192.168.206.128:2379,https://192.168.206.129:2379,https://192.168.206.130:2379 \\
--bind-address=192.168.206.128 \\
--secure-port=6443 \\
--advertise-address=192.168.206.128 \\
--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/etcd/ssl/ca.pem \\
--etcd-certfile=/opt/etcd/ssl/server.pem \\
--etcd-keyfile=/opt/etcd/ssl/server-key.pem \\
--audit-log-maxage=30 \\
--audit-log-maxbackup=3 \\
--audit-log-maxsize=100 \\
--audit-log-path=/opt/kubernetes/logs/k8s-audit.log"
EOF

上面两个\ \ 第一个是转义符，第二个是换行符，使用转义符是为了使用 EOF 保留换行符。

• –logtostderr：启用日志
• —v：日志等级
• –log-dir：日志目录
• –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 机制
• –token-auth-file：bootstrap token 文件
• –service-node-port-range：Service nodeport 类型默认分配端口范围
• –kubelet-client-xxx：apiserver 访问 kubelet 客户端证书
• –tls-xxx-file：apiserver https 证书
• –etcd-xxxfile：连接 Etcd 集群证书
• –audit-log-xxx：审计日志

5.7 把生成的证书拷贝到配置文件中的路径

cp ~/TLS/k8s/ca*pem ~/TLS/k8s/server*pem /opt/kubernetes/ssl/

5.8 创建上述配置文件中 token 文件

cat > /opt/kubernetes/cfg/token.csv << EOF
c47ffb939f5ca36231d9e3121a252940,kubelet-bootstrap,10001,"system:node-bootstrapper"
EOF

格式：token，用户名，UID，用户组 token 也可自行生成替换：

head -c 16 /dev/urandom | od -An -t x | tr -d ' '

5.9 systemd 管理 apiserver

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

启动并设置开机启动

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

5.10 授权 kubelet-bootstrap 用户允许请求证书

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

5.11 部署 kube-controller-manager

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

• –master：通过本地非安全本地端口 8080 连接 apiserver

• –leader-elect：当该组件启动多个时，自动选举（HA）

• –cluster-signing-cert-file/–cluster-signing-key-file：自动为 kubelet 颁发证书的 CA，与 apiserver 保持一致

5.12 systemd 管理 controller-manager

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

启动并设置开机启动

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

5.13 部署 kube-scheduler

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

–master：通过本地非安全本地端口 8080 连接 apiserver

–leader-elect：当该组件启动多个时，自动选举（HA）

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

启动并设置开机启动

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

5.14 查看集群状态

kubectl get cs

6.部署Worker Node（两个node同步执行）

6.1k8s安装包解压安装

mkdir -p /opt/kubernetes/{bin,cfg,ssl,logs}
tar zxvf kubernetes-server-linux-amd64.tar.gz
cd kubernetes/server/bin
cp kubelet kube-proxy /opt/kubernetes/bin
cp kubectl /usr/bin/

6.2 配置kubelet

cat > /opt/kubernetes/cfg/kubelet.conf << EOF
KUBELET_OPTS="--logtostderr=false \\
--v=2 \\
--log-dir=/opt/kubernetes/logs \\
--hostname-override=m1 \\
--network-plugin=cni \\
--kubeconfig=/opt/kubernetes/cfg/kubelet.kubeconfig \\
--bootstrap-kubeconfig=/opt/kubernetes/cfg/bootstrap.kubeconfig \\
--config=/opt/kubernetes/cfg/kubelet-config.yml \\
--cert-dir=/opt/kubernetes/ssl \\
--pod-infra-container-image=lizhenliang/pause-amd64:3.0"
EOF

• –hostname-override：显示名称，集群中唯一
• –network-plugin：启用CNI
• –kubeconfig：空路径，会自动生成，后面用于连接apiserver
• –bootstrap-kubeconfig：首次启动向apiserver申请证书
• –config：配置参数文件
• –cert-dir：kubelet证书生成目录
• –pod-infra-container-image：管理Pod网络容器的镜像

cat > /opt/kubernetes/cfg/kubelet-config.yml << EOF
kind: KubeletConfiguration
apiVersion: kubelet.config.k8s.io/v1beta1
address: 0.0.0.0
port: 10250
readOnlyPort: 10255
cgroupDriver: cgroupfs
clusterDNS:
- 10.0.0.2
clusterDomain: cluster.local 
failSwapOn: false
authentication:
  anonymous:
    enabled: false
  webhook:
    cacheTTL: 2m0s
    enabled: true
  x509:
    clientCAFile: /opt/kubernetes/ssl/ca.pem 
authorization:
  mode: Webhook
  webhook:
    cacheAuthorizedTTL: 5m0s
    cacheUnauthorizedTTL: 30s
evictionHard:
  imagefs.available: 15%
  memory.available: 100Mi
  nodefs.available: 10%
  nodefs.inodesFree: 5%
maxOpenFiles: 1000000
maxPods: 110
EOF

6.3 将master一些配置文件拷贝到node节点上

scp -r /opt/kubernetes/ssl root@192.168.206.129:/opt/kubernetes
scp -r /opt/kubernetes/ssl root@192.168.206.130:/opt/kubernetes

6.4 生成bootstrap.kubeconfig文件

KUBE_APISERVER="https://192.168.206.128:6443"  # apiserver IP:PORT
TOKEN="c47ffb939f5ca36231d9e3121a252940"  # 与token.csv里保持一致

上面两个变量需要根据自己情况设置，赋到脚本对应位置执行：

kubectl config set-cluster kubernetes \
  --certificate-authority=/opt/kubernetes/ssl/ca.pem \
  --embed-certs=true \
  --server=${KUBE_APISERVER} \
  --kubeconfig=bootstrap.kubeconfig
kubectl config set-credentials "kubelet-bootstrap" \
  --token=${TOKEN} \
  --kubeconfig=bootstrap.kubeconfig
kubectl config set-context default \
  --cluster=kubernetes \
  --user="kubelet-bootstrap" \
  --kubeconfig=bootstrap.kubeconfig
kubectl config use-context default --kubeconfig=bootstrap.kubeconfig

mv bootstrap.kubeconfig /opt/kubernetes/cfg

6.5 systemd管理kubelet

cat > /usr/lib/systemd/system/kubelet.service << EOF
[Unit]
Description=Kubernetes Kubelet
After=docker.service
[Service]
EnvironmentFile=/opt/kubernetes/cfg/kubelet.conf
ExecStart=/opt/kubernetes/bin/kubelet \$KUBELET_OPTS
Restart=on-failure
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
EOF

启动并设置开机启动

systemctl daemon-reload
systemctl start kubelet
systemctl enable kubelet

6.7 批准kubelet证书申请并加入集群（master执行）

# 查看kubelet证书请求
kubectl get csr
NAME                                                   AGE    SIGNERNAME                                    REQUESTOR           CONDITION
node-csr-uCEGPOIiDdlLODKts8J658HrFq9CZ--K6M4G7bjhk8A   6m3s   kubernetes.io/kube-apiserver-client-kubelet   kubelet-bootstrap   Pending
node-csr-***
# 批准申请
kubectl certificate approve node-csr-uCEGPOIiDdlLODKts8J658HrFq9CZ--K6M4G7bjhk8A
kubectl certificate approve node-csr-***
# 查看节点
kubectl get node

由于网络插件还没有部署，节点会没有准备就绪 NotReady。

6.8 部署kube-proxy

cat > /opt/kubernetes/cfg/kube-proxy.conf << EOF
KUBE_PROXY_OPTS="--logtostderr=false \\
--v=2 \\
--log-dir=/opt/kubernetes/logs \\
--config=/opt/kubernetes/cfg/kube-proxy-config.yml"
EOF

cat > /opt/kubernetes/cfg/kube-proxy-config.yml << EOF
kind: KubeProxyConfiguration
apiVersion: kubeproxy.config.k8s.io/v1alpha1
bindAddress: 0.0.0.0
metricsBindAddress: 0.0.0.0:10249
clientConnection:
  kubeconfig: /opt/kubernetes/cfg/kube-proxy.kubeconfig
hostnameOverride: node1
clusterCIDR: 10.0.0.0/24
EOF

hostnameOverride设置对应node机器的hostname。

6.9 生成kube-proxy.kubeconfig文件（master生成传到node）

# 切换工作目录
cd TLS/k8s

# 创建证书请求文件
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

# 生成证书
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@master k8s]# ls kube-proxy*pem
kube-proxy-key.pem  kube-proxy.pem

将master生成的证书传输到node

scp /root/TLS/k8s/kube-proxy*pem root@192.168.206.129:/opt/kubernetes/ssl
scp /root/TLS/k8s/kube-proxy*pem root@192.168.206.130:/opt/kubernetes/ssl

6.10 生成kubeconfig文件

KUBE_APISERVER="https://192.168.206.128:6443"  # apiserver IP:PORT

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

6.11 systemd管理kube-proxy

cat > /usr/lib/systemd/system/kube-proxy.service << EOF
[Unit]
Description=Kubernetes Proxy
After=network.target
[Service]
EnvironmentFile=/opt/kubernetes/cfg/kube-proxy.conf
ExecStart=/opt/kubernetes/bin/kube-proxy \$KUBE_PROXY_OPTS
Restart=on-failure
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
EOF

启动并设置开机启动：

systemctl daemon-reload
systemctl start kube-proxy
systemctl enable kube-proxy

7.部署CNI网络

下载安装

下载地址：https://github.com/containernetworking/plugins/releases
版本：v0.8.6（安装包名：cni-plugins-linux-amd64-v0.8.6.tgz）

node节点操作：

mkdir /opt/cni/bin
tar zxvf cni-plugins-linux-amd64-v0.8.6.tgz -C /opt/cni/bin

master节点操作：

wget --no-check-certificate https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
kubectl apply -f kube-flannel.yml

参考：

1. 【尚硅谷】Kubernetes（k8s）入门到实战教程丨全新升级完整版

2. k8s集群 (二进制安装方式)