二进制部署kubernetes集群的推荐方式

软件版本：

软件 版本
containerd v1.6.5
etcd v3.5.0
kubernetes v1.24.0

一、系统环境

1.1 环境准备

角色 IP 服务
k8s-master01 192.168.10.10 etcd、containerd、kube-apiserver、kube-scheduler、kube-controller-manager、kubele、kube-proxy
k8s-node01 后续 etcd、containerd、kubele、kube-proxy
k8s-node02 后续 etcd、containerd、kubele、kube-proxy

1.2 环境初始化

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#关闭防火墙和selinux
systemctl stop firewalld
systemctl disable firewalld
sed -i 's/enforcing/disabled/' /etc/selinux/config  
setenforce 0 

#关闭swap
swapoff -a  
sed -ri 's/.*swap.*/#&/' /etc/fstab

#将桥接的IPv4流量传递到iptables的链，lsmod | grep br_netfilter可以查看，sudo modprobe显示加载
sudo modprobe br_netfilter
cat <<EOF | sudo tee /etc/modules-load.d/k8s.conf
br_netfilter
EOF

#将桥接的IPv4流量传递到iptables的链
cat > /etc/sysctl.d/k8s.conf << EOF
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
sysctl --system 

#时间同步
yum install ntpdate -y
ntpdate time.windows.com
clock -w

#安装ipvs
yum install ipset ipvsadm -y 

yum install ipset ipvsadm -y 

# 
cat >> /etc/sysconfig/modules/ipvs.modules << EOF
#!/bin/bash
modprobe -- ip_vs
modprobe -- ip_vs_sh
modprobe -- ip_vs_rr
modprobe -- ip_vs_wrr
modprobe -- nf_conntrack_ipv4
EOF

chmod +x /etc/sysconfig/modules/ipvs.modules

1.3 文件夹初始化

准备文件夹

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mkdir -p /usr/local/k8s-install
mkdir -p /usr/local/k8s-install/cert
mkdir -p /usr/local/k8s-install/tools
mkdir /etc/kubernetes
mkdir /etc/kubernetes/pki
mkdir /etc/kubernetes/manifests

环境文件夹

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mkdir -p /opt/etcd/{bin,ssl,cfg,data,wal}

二、软件下载

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curl -L https://github.com/cloudflare/cfssl/releases/download/v1.5.0/cfssl_1.5.0_linux_amd64 -o cfssl
chmod +x cfssl
curl -L https://github.com/cloudflare/cfssl/releases/download/v1.5.0/cfssljson_1.5.0_linux_amd64 -o cfssljson
chmod +x cfssljson
curl -L https://github.com/cloudflare/cfssl/releases/download/v1.5.0/cfssl-certinfo_1.5.0_linux_amd64 -o cfssl-certinfo
chmod +x cfssl-certinfo
mv {cfssl,cfssljson,cfssl-certinfo} /usr/local/bin

kubernetes：

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k8s二进制包下载
cd /usr/local/k8s-install/tools
wget -c https://dl.k8s.io/v1.24.0/kubernetes-server-linux-amd64.tar.gz

tar -zxf kubernetes-server-linux-amd64.tar.gz
cd kubernetes/server/bin

cp {kube-apiserver,kube-controller-manager,kube-scheduler,kubelet,kube-proxy,kubectl} /usr/local/bin

三、生成证书

3.1 证书签发的配置文件

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cat > /usr/local/k8s-install/cert/ca-config.json <<END
{
  "signing": {
    "default": {
      "expiry": "876000h"
    },
    "profiles": {
      "kubernetes": {
        "usages": [
          "signing",
          "key encipherment",
          "server auth",
          "client auth"
        ],
        "expiry": "876000h"
      },
      "etcd": {
        "usages": [
          "signing",
          "key encipherment",
          "server auth",
          "client auth"
        ],
        "expiry": "876000h"
      }
    }
  }
}
END
cp /usr/local/k8s-install/cert/ca-config.json /etc/kubernetes

3.2 etcd CA证书

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rm -rf /usr/local/k8s-install/cert/etcd/
mkdir /usr/local/k8s-install/cert/etcd/
cd /usr/local/k8s-install/cert/etcd/
cat > etcd-ca-csr.json <<END
{
  "CN": "etcd",
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "ST": "Beijing",
      "L": "Beijing",
      "O": "etcd",
      "OU": "etcd"
    }
  ],
  "ca": {
    "expiry": "87600h"
  }
}
END
cfssl gencert -initca etcd-ca-csr.json | cfssljson -bare ca -

cp {ca.pem,ca-key.pem} /opt/etcd/ssl/

3.3 etcd 证书签发

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cd /usr/local/k8s-install/cert/etcd
cat > etcd-csr.json<< EOF
{
    "CN":"etcd",
    "hosts":[
    	"127.0.0.1",
        "k8s-master01",
        "192.168.10.10"
    ],
    "key":{
        "algo":"rsa",
        "size":2048
    },
    "names":[
        {
            "C":"CN",
            "L":"BeiJing",
            "ST":"BeiJing",
            "O": "Kubernetes",
            "OU": "etcd"
        }
    ]
}
EOF

cfssl gencert -ca=/usr/local/k8s-install/cert/etcd/ca.pem -ca-key=/usr/local/k8s-install/cert/etcd/ca-key.pem -config=/usr/local/k8s-install/cert/ca-config.json -profile=etcd etcd-csr.json | cfssljson -bare etcd

cp {etcd-key.pem,etcd.pem} /opt/etcd/ssl/

3.4 k8s CA证书

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cat > /usr/local/k8s-install/cert/ca-csr.json <<END   
{
  "CN": "kubernetes",
  "key": {      
    "algo": "rsa",     
    "size": 2048
  },             
  "names":[{         
    "C": "CN",     
    "ST": "Beijing",
    "L": "Beijing",          
    "O": "Kubernetes",         
    "OU": "Kubernetes"     
  }]      
}                        
END

cd /usr/local/k8s-install/cert
cfssl gencert -initca ca-csr.json | cfssljson -bare ca
cp {ca.pem,ca-key.pem} /etc/kubernetes/pki

3.5 apiserver证书签发

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rm -rf /usr/local/k8s-install/cert/apiserver
mkdir /usr/local/k8s-install/cert/apiserver
cd /usr/local/k8s-install/cert/apiserver

cat > server-csr.json << END
{
  "CN": "kubernetes",
  "hosts": [
    "127.0.0.1",
    "10.0.0.1",
    "192.168.10.10",
    "k8s-master01",
    "kubernetes",
    "kubernetes.default",
    "kubernetes.default.svc",
    "kubernetes.default.svc.cluster",
    "kubernetes.default.svc.cluster.local"
  ],
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [{
    "C": "CN",
    "ST": "Beijing",
    "L": "Beijing",
    "O": "Kubernetes",
    "OU": "Kubernetes"
  }]
}
END

cfssl gencert -ca=/etc/kubernetes/pki/ca.pem -ca-key=/etc/kubernetes/pki/ca-key.pem  --config=/usr/local/k8s-install/cert/ca-config.json -profile=kubernetes  server-csr.json | cfssljson -bare server

cp -r {server.pem,server-key.pem} /etc/kubernetes/pki

3.6 front-proxy证书签发

官方文档：配置聚合层 | Kubernetes

ca证书生成：

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rm -rf /usr/local/k8s-install/cert/font-proxy
mkdir /usr/local/k8s-install/cert/font-proxy
cd /usr/local/k8s-install/cert/font-proxy
cat > front-proxy-ca-csr.json  << EOF 
{
  "CN": "kubernetes",
  "key": {
     "algo": "rsa",
     "size": 2048
  }
}
EOF

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

证书签发

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cd /usr/local/k8s-install/cert/font-proxy
cat > front-proxy-client-csr.json  << EOF 
{
  "CN": "front-proxy-client",
  "key": {
     "algo": "rsa",
     "size": 2048
  }
}
EOF

cfssl gencert   -ca=front-proxy-ca.pem   -ca-key=front-proxy-ca-key.pem   -config=/usr/local/k8s-install/cert/ca-config.json   -profile=kubernetes   front-proxy-client-csr.json | cfssljson -bare front-proxy-client

cp {front-proxy-ca.pem,front-proxy-ca-key.pem,front-proxy-client-key.pem,front-proxy-client.pem} /etc/kubernetes/pki

3.7 kube-controller-manager证书签发

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rm -rf /usr/local/k8s-install/cert/kube-controller-manager
mkdir /usr/local/k8s-install/cert/kube-controller-manager
cd /usr/local/k8s-install/cert/kube-controller-manager
cat > kube-controller-manager-csr.json << EOF
{
  "CN": "system:kube-controller-manager",
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "L": "BeiJing", 
      "ST": "BeiJing",
      "O": "system:masters",
      "OU": "Kubernetes"
    }
  ]
}
EOF

cfssl gencert -ca=/etc/kubernetes/pki/ca.pem -ca-key=/etc/kubernetes/pki/ca-key.pem -config=/usr/local/k8s-install/cert/ca-config.json -profile=kubernetes kube-controller-manager-csr.json | cfssljson -bare kube-controller-manager
cp {kube-controller-manager.pem,kube-controller-manager-key.pem} /etc/kubernetes/pki

3.8 scheduler证书签发

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rm -rf /usr/local/k8s-install/cert/kube-scheduler
mkdir /usr/local/k8s-install/cert/kube-scheduler
cd /usr/local/k8s-install/cert/kube-scheduler
cat > kube-scheduler-csr.json << EOF
{
  "CN": "system:kube-scheduler",
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "L": "BeiJing",
      "ST": "BeiJing",
      "O": "system:kube-scheduler",
      "OU": "Kubernetes"
    }
  ]
}
EOF

cfssl gencert -ca=/etc/kubernetes/pki/ca.pem -ca-key=/etc/kubernetes/pki/ca-key.pem -config=/usr/local/k8s-install/cert/ca-config.json -profile=kubernetes kube-scheduler-csr.json | cfssljson -bare kube-scheduler
cp {kube-scheduler.pem,kube-scheduler-key.pem} /etc/kubernetes/pki

3.9 admin证书签发

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rm -rf /usr/local/k8s-install/cert/admin
mkdir /usr/local/k8s-install/cert/admin
cd /usr/local/k8s-install/cert/admin
cat > admin-csr.json <<EOF
{
  "CN": "admin",
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "L": "BeiJing",
      "ST": "BeiJing",
      "O": "system:masters",
      "OU": "Kubernetes"
    }
  ]
}
EOF

cfssl gencert -ca=/etc/kubernetes/pki/ca.pem -ca-key=/etc/kubernetes/pki/ca-key.pem -config=/etc/kubernetes/ca-config.json -profile=kubernetes admin-csr.json | cfssljson -bare admin
cp {admin.pem,admin-key.pem} /etc/kubernetes/pki

3.10 ServiceAccount Key生成

k8s每创建一个ServiceAccount，都会分配一个Secret，而Secret里面的秘钥就是sa生成的。

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mkdir /usr/local/k8s-install/cert/sa
cd /usr/local/k8s-install/cert/sa
openssl genrsa -out sa.key 2048
openssl rsa -in sa.key -pubout -out sa.pub
cp {sa.key,sa.pub} /etc/kubernetes/pki

3.11 kube-proxy证书签发

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rm -rf /usr/local/k8s-install/cert/kube-proxy
mkdir /usr/local/k8s-install/cert/kube-proxy
cd /usr/local/k8s-install/cert/kube-proxy
cat > kube-proxy-csr.json << END
{
  "CN": "system:kube-proxy",
  "hosts": [],
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [{
    "C": "CN",
    "ST": "Beijing",
    "L": "Beijing",
    "O": "Kubernetes",
    "OU": "System"
  }]
}
END

cfssl gencert -ca=/etc/kubernetes/pki/ca.pem -ca-key=/etc/kubernetes/pki/ca-key.pem  --config=/etc/kubernetes/ca-config.json -profile=kubernetes   kube-proxy-csr.json | cfssljson -bare kube-proxy

cp -r {kube-proxy.pem,kube-proxy-key.pem} /etc/kubernetes/pki

四、部署containerd

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#安装containerd
wget -c https://github.com/containerd/containerd/releases/download/v1.6.5/cri-containerd-cni-1.6.5-linux-amd64.tar.gz
tar -zxf cri-containerd-cni-1.6.5-linux-amd64.tar.gz  -C /

#安装libseccomp
wget http://rpmfind.net/linux/centos/8-stream/BaseOS/x86_64/os/Packages/libseccomp-2.5.1-1.el8.x86_64.rpm
rpm -ivh libseccomp-2.5.1-1.el8.x86_64.rpm

#开机启动
systemctl enable containerd --now

五、部署etcd

5.1 安装

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wget -c https://github.com/etcd-io/etcd/releases/download/v3.5.0/etcd-v3.5.0-linux-amd64.tar.gz
tar -zxf etcd-v3.5.0-linux-amd64.tar.gz
cd etcd-v3.5.0-linux-amd64
mv {etcd,etcdctl,etcdutl} /opt/etcd/bin/

#环境变量
echo "PATH=\$PATH:/opt/etcd/bin" >> /etc/profile
source /etc/profile

5.2 证书准备

证书文件在3.3已经准备了

5.3 配置文件

/opt/etcd/cfg/etcd.yaml 配置文件：etcd/etcd.conf.yml.sample at main · etcd-io/etcd · GitHub

192.168.10.10

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name: "etcd-1"
data-dir: "/opt/etcd/data"
wal-dir: "/opt/etcd/wal"
# 用于侦听对等流量的逗号分隔的url列表。
listen-peer-urls: https://192.168.10.10:2380
# 用于侦听客户机通信的逗号分隔的url列表。
listen-client-urls: https://192.168.10.10:2379
# 这个成员的对等url的列表，以通告给集群的其他成员。url需要是逗号分隔的列表。
initial-advertise-peer-urls: https://192.168.10.10:2380
#这个成员的对等url的列表，以通告给集群的其他成员。url需要是逗号分隔的列表。
advertise-client-urls: https://192.168.10.10:2379
# Initial cluster configuration for bootstrapping.
initial-cluster: 'etcd-1=https://192.168.10.10:2380,etcd-2=https://192.168.66.41:2380,etcd-3=https://192.168.66.42:2380'
# Initial cluster token for the etcd cluster during bootstrap.
initial-cluster-token: 'etcd-cluster'
# Initial cluster state ('new' or 'existing').
initial-cluster-state: 'new'
client-transport-security:
  # Path to the client server TLS cert file.
  cert-file: /opt/etcd/ssl/etcd.pem

  # Path to the client server TLS key file.
  key-file: /opt/etcd/ssl/etcd-key.pem
  # Path to the client server TLS trusted CA cert file.
  trusted-ca-file: /opt/etcd/ssl/ca.pem
peer-transport-security:
  # Path to the peer server TLS cert file.
  cert-file: /opt/etcd/ssl/etcd.pem

  # Path to the peer server TLS key file.
  key-file: /opt/etcd/ssl/etcd-key.pem

  # Path to the peer server TLS trusted CA cert file.
  trusted-ca-file: /opt/etcd/ssl/ca.pem

192.168.66.41

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name: "etcd-2"
listen-peer-urls: https://192.168.66.41:2380
# 用于侦听客户机通信的逗号分隔的url列表。
listen-client-urls: https://192.168.66.41:2379
# 这个成员的对等url的列表，以通告给集群的其他成员。url需要是逗号分隔的列表。
initial-advertise-peer-urls: https://192.168.66.41:2380
#这个成员的对等url的列表，以通告给集群的其他成员。url需要是逗号分隔的列表。
advertise-client-urls: https://192.168.66.41:2379

192.168.66.42

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name: "etcd-2"
listen-peer-urls: https://192.168.66.42:2380
# 用于侦听客户机通信的逗号分隔的url列表。
listen-client-urls: https://192.168.66.42:2379
# 这个成员的对等url的列表，以通告给集群的其他成员。url需要是逗号分隔的列表。
initial-advertise-peer-urls: https://192.168.66.42:2380
#这个成员的对等url的列表，以通告给集群的其他成员。url需要是逗号分隔的列表。
advertise-client-urls: https://192.168.66.42:2379

5.4 服务配置

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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 
ExecStart=/opt/etcd/bin/etcd  --config-file /opt/etcd/cfg/etcd.yml 
Restart=on-failure 
LimitNOFILE=65536 
[Install] 
WantedBy=multi-user.target 
EOF

5.5 启动服务

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systemctl enable etcd --now

5.6 集群状态查看

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[root@k8s-master01 k8s]# etcdctl --cacert=/opt/etcd/ssl/ca.pem --cert=/opt/etcd/ssl/etcd.pem --key=/opt/etcd/ssl/etcd-key.pem --endpoints="https://192.168.10.10:2379,https://192.168.66.41:2379,https://192.168.66.42:2379" endpoint status --write-out=table
+------------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
|        ENDPOINT        |        ID        | VERSION | DB SIZE | IS LEADER | IS LEARNER | RAFT TERM | RAFT INDEX | RAFT APPLIED INDEX | ERRORS |
+------------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
| https://192.168.10.10:2379 | 1f46bee47a4f04aa |   3.5.0 |   20 kB |     false |      false |        15 |         68 |                 68 |        |
| https://192.168.66.41:2379 |   b3e5838df5f510 |   3.5.0 |   20 kB |     false |      false |        15 |         68 |                 68 |        |
| https://192.168.66.42:2379 | a437554da4f2a14c |   3.5.0 |   25 kB |      true |      false |        15 |         68 |                 68 |        |
+------------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+

六、用户环境配置

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rm -rf /root/.kube
mkdir /root/.kube
KUBE_CONFIG="/root/.kube/config"
KUBE_APISERVER="https://192.168.10.10:6443"

#设置集群参数
kubectl config set-cluster kubernetes \
  --certificate-authority=/etc/kubernetes/pki/ca.pem \
  --embed-certs=true \
  --server=${KUBE_APISERVER} \
  --kubeconfig=${KUBE_CONFIG}
#设置客户端认证参数
kubectl config set-credentials kubernetes-admin \
  --client-certificate=/etc/kubernetes/pki/admin.pem \
  --client-key=/etc/kubernetes/pki/admin-key.pem \
  --embed-certs=true \
  --kubeconfig=${KUBE_CONFIG}
#设置上下文参数
kubectl config set-context kubernetes-admin@kubernetes \
  --cluster=kubernetes \
  --user=kubernetes-admin \
  --kubeconfig=${KUBE_CONFIG}
#设置默认上下文
kubectl config use-context kubernetes-admin@kubernetes --kubeconfig=${KUBE_CONFIG}

七、部署kube-apiserver

7.1 kube-apiserver 服务配置

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cat > /usr/lib/systemd/system/kube-apiserver.service << EOF 
[Unit] 
Description=Kubernetes API Server 
Documentation=https://github.com/kubernetes/kubernetes 
[Service] 
ExecStart=/usr/local/bin/kube-apiserver --v=2  \
--logtostderr=true  \
--advertise-address=192.168.10.10 \
--bind-address=192.168.10.10 \
--service-node-port-range=30000-32767  \
--allow-privileged=true  \
--authorization-mode=RBAC,Node  \
--client-ca-file=/etc/kubernetes/pki/ca.pem  \
--enable-admission-plugins=NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,DefaultTolerationSeconds,NodeRestriction,ResourceQuota   \
--enable-bootstrap-token-auth=true  \
--etcd-cafile=/opt/etcd/ssl/ca.pem  \
--etcd-certfile=/opt/etcd/ssl/etcd.pem  \
--etcd-keyfile=/opt/etcd/ssl/etcd-key.pem  \
--etcd-servers=https://192.168.10.10:12379,https://192.168.10.10:22379,https://192.168.10.10:32379 \
--kubelet-client-certificate=/etc/kubernetes/pki/server.pem  \
--kubelet-client-key=/etc/kubernetes/pki/server-key.pem  \
--kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname \
--proxy-client-cert-file=/etc/kubernetes/pki/front-proxy-client.pem \
--proxy-client-key-file=/etc/kubernetes/pki/front-proxy-client-key.pem \
--requestheader-allowed-names=kube-proxy \
--requestheader-client-ca-file=/etc/kubernetes/pki/front-proxy-ca.pem \
--requestheader-extra-headers-prefix=X-Remote-Extra- \
--requestheader-group-headers=X-Remote-Group \
--requestheader-username-headers=X-Remote-User \
--secure-port=6443  \
--service-account-issuer=https://kubernetes.default.svc.cluster.local \
--service-account-signing-key-file=/etc/kubernetes/pki/sa.key \
--service-account-key-file=/etc/kubernetes/pki/sa.pub  \
--service-cluster-ip-range=10.0.0.0/24  \
--tls-cert-file=/etc/kubernetes/pki/server.pem  \
--tls-private-key-file=/etc/kubernetes/pki/server-key.pem \
--runtime-config=settings.k8s.io/v1alpha1=true 

Restart=on-failure 
RestartSec=10s
LimitNOFILE=65535
[Install] 
WantedBy=multi-user.target 
EOF

说明：

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-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-account-issuer 此参数可作为服务账户令牌发放者的身份标识
–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 
--enable-aggregator-routing=true如果你未在运行 API 服务器的主机上运行 kube-proxy，则必须确保使用以下 kube-apiserver 标志启用系统
–etcd-xxxfile：连接 Etcd 集群证书 
–audit-log-xxx：审计日志

如果你未在运行 API 服务器的主机上运行 kube-proxy，则必须确保使用以下 kube-apiserver 标志启用系统：

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--enable-aggregator-routing=true

7.2 设置开机启动

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systemctl daemon-reload 
systemctl enable kube-apiserver --now

八、kube-controller-manager

8.1 kubeconfig配置

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rm -rf /etc/kubernetes/controller-manager.conf
KUBE_CONFIG="/etc/kubernetes/controller-manager.conf"
KUBE_APISERVER="https://192.168.10.10:6443"

# 设置一个集群项
kubectl config set-cluster kubernetes \
  --certificate-authority=/etc/kubernetes/pki/ca.pem \
  --embed-certs=true \
  --server=${KUBE_APISERVER} \
  --kubeconfig=${KUBE_CONFIG}
# 设置一个环境项，一个上下文
kubectl config set-context system:kube-controller-manager@kubernetes \
    --cluster=kubernetes \
    --user=system:kube-controller-manager \
    --kubeconfig=${KUBE_CONFIG}
# 设置一个证书
kubectl config set-credentials system:kube-controller-manager \
  --client-certificate=/etc/kubernetes/pki/kube-controller-manager.pem \
  --client-key=/etc/kubernetes/pki/kube-controller-manager-key.pem \
  --embed-certs=true \
  --kubeconfig=${KUBE_CONFIG}

kubectl config use-context system:kube-controller-manager@kubernetes --kubeconfig=${KUBE_CONFIG}

8.2 服务配置

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cat > /usr/lib/systemd/system/kube-controller-manager.service << END
[Unit] 
Description=Kubernetes Controller Manager 
Documentation=https://github.com/kubernetes/kubernetes 
[Service] 
ExecStart=/usr/local/bin/kube-controller-manager  \
--v=2 \
--logtostderr=true \
--bind-address=127.0.0.1   \
--root-ca-file=/etc/kubernetes/pki/ca.pem \
--cluster-signing-cert-file=/etc/kubernetes/pki/ca.pem   \
--cluster-signing-key-file=/etc/kubernetes/pki/ca-key.pem  \
--service-account-private-key-file=/etc/kubernetes/pki/sa.key  \
--kubeconfig=/etc/kubernetes/controller-manager.conf \
--leader-elect=true  \
--use-service-account-credentials=true \
--node-monitor-grace-period=40s \
--node-monitor-period=5s \
--pod-eviction-timeout=2m0s \
--controllers=*,bootstrapsigner,tokencleaner \
--allocate-node-cidrs=true \
--cluster-cidr=10.244.0.0/16   \
--requestheader-client-ca-file=/etc/kubernetes/pki/front-proxy-ca.pem \
--node-cidr-mask-size=24

Restart=always
RestartSec=10s
[Install] 
WantedBy=multi-user.target
END
参数 说明
–cluster-cidr string 集群中 Pod 的 CIDR 范围。要求 --allocate-node-cidrs 标志为 true。
–service-cluster-ip-range 集群中 Service 对象的 CIDR 范围。要求 --allocate-node-cidrs 标志为 true。
-v, –v int 日志级别详细程度取值。
–kubeconfig Kubernetes 认证文件
–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

8.3 启动并设置开机启动

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

九、部署kube-scheduler

9.1 kubeconfig配置

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rm -rf /etc/kubernetes/kube-scheduler.conf
KUBE_CONFIG="/etc/kubernetes/kube-scheduler.conf"
KUBE_APISERVER="https://192.168.10.10:6443"

kubectl config set-cluster kubernetes \
  --certificate-authority=/etc/kubernetes/pki/ca.pem \
  --embed-certs=true \
  --server=${KUBE_APISERVER} \
  --kubeconfig=${KUBE_CONFIG}
kubectl config set-credentials system:kube-scheduler \
  --client-certificate=/etc/kubernetes/pki/kube-scheduler.pem \
  --client-key=/etc/kubernetes/pki/kube-scheduler-key.pem \
  --embed-certs=true \
  --kubeconfig=${KUBE_CONFIG}
kubectl config set-context system:kube-scheduler@kubernetes \
  --cluster=kubernetes \
  --user=system:kube-scheduler \
  --kubeconfig=${KUBE_CONFIG}
kubectl config use-context system:kube-scheduler@kubernetes --kubeconfig=${KUBE_CONFIG}

9.2 服务配置

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cat > /usr/lib/systemd/system/kube-scheduler.service  << END
[Unit] 
Description=Kubernetes Scheduler 
Documentation=https://github.com/kubernetes/kubernetes
[Service] 
ExecStart=/usr/local/bin/kube-scheduler \
--v=2 \
--logtostderr=true \
--bind-address=127.0.0.1 \
--leader-elect=true \
--kubeconfig=/etc/kubernetes/kube-scheduler.conf

Restart=always
RestartSec=10s
[Install] 
WantedBy=multi-user.target 
END

9.3 启动并设置开机启动

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systemctl daemon-reload 
systemctl enable kube-scheduler --now

十、TLS Bootstrapping配置

启用 TLS Bootstrapping 机制 TLS Bootstraping：Master apiserver 启用 TLS 认证后，Node 节点 kubelet 和 kube- proxy 要与 kube-apiserver 进行通信，必须使用 CA 签发的有效证书才可以，当 Node 节点很多时，这种客户端证书颁发需要大量工作，同样也会增加集群扩展复杂度。为了简化流程，Kubernetes 引入了 TLS bootstraping 机制来自动颁发客户端证书，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。
所以强烈建议在 Node 上使用这种方式，目前主要用于 kubelet，kube-proxy 还是由我们统一颁发一个证书。

TLS bootstraping 工作流程：

1659365157408

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#随机token，但是只需要16个字符
head -c 16 /dev/urandom | od -An -t x | tr -d ' '
# 值如下： 737b177d9823531a433e368fcdb16f5f

# 生成16个字符的
head -c 8 /dev/urandom | od -An -t x | tr -d ' '
# d683399b7a553977

生成16个字符的

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[root@k8s-master01 ~]# head -c 8 /dev/urandom | od -An -t x | tr -d ' '
271c0f7e7a3bd6cd

创建kubelet上下文信息

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KUBE_CONFIG="/etc/kubernetes/bootstrap-kubelet.conf"
KUBE_APISERVER="https://192.168.10.10:6443"
TOKEN_ID="2678ad"
TOKEN="271c0f7e7a3bd6cd"

kubectl config set-cluster kubernetes \
  --certificate-authority=/etc/kubernetes/pki/ca.pem \
  --embed-certs=true \
  --server=${KUBE_APISERVER} \
  --kubeconfig=${KUBE_CONFIG}
kubectl config set-credentials kubelet-bootstrap \
  --token=${TOKEN_ID}.${TOKEN} \
  --kubeconfig=${KUBE_CONFIG}
kubectl config set-context kubelet-bootstrap@kubernetes \
  --cluster=kubernetes \
  --user=kubelet-bootstrap \
  --kubeconfig=${KUBE_CONFIG}
kubectl config use-context kubelet-bootstrap@kubernetes --kubeconfig=${KUBE_CONFIG}

创建集群引导权限文件：

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TOKEN_ID="2678ad"
TOKEN="271c0f7e7a3bd6cd"

cat > /usr/local/k8s-install/yaml/bootstrap.secret.yaml << END
apiVersion: v1
kind: Secret
metadata:
  name: bootstrap-token-${TOKEN_ID}
  namespace: kube-system
type: bootstrap.kubernetes.io/token
stringData:
  description: "The default bootstrap token generated by 'kubelet '."
  token-id: ${TOKEN_ID}
  token-secret: ${TOKEN}
  usage-bootstrap-authentication: "true"
  usage-bootstrap-signing: "true"
  auth-extra-groups:  system:bootstrappers:default-node-token,system:bootstrappers:worker,system:bootstrappers:ingress
 
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: kubelet-bootstrap
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: system:node-bootstrapper
subjects:
- apiGroup: rbac.authorization.k8s.io
  kind: Group
  name: system:bootstrappers:default-node-token
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: node-autoapprove-bootstrap
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: system:certificates.k8s.io:certificatesigningrequests:nodeclient
subjects:
- apiGroup: rbac.authorization.k8s.io
  kind: Group
  name: system:bootstrappers:default-node-token
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: node-autoapprove-certificate-rotation
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: system:certificates.k8s.io:certificatesigningrequests:selfnodeclient
subjects:
- apiGroup: rbac.authorization.k8s.io
  kind: Group
  name: system:nodes
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  annotations:
    rbac.authorization.kubernetes.io/autoupdate: "true"
  labels:
    kubernetes.io/bootstrapping: rbac-defaults
  name: system:kube-apiserver-to-kubelet
rules:
  - apiGroups:
      - ""
    resources:
      - nodes/proxy
      - nodes/stats
      - nodes/log
      - nodes/spec
      - nodes/metrics
    verbs:
      - "*"
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: system:kube-apiserver
  namespace: ""
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: system:kube-apiserver-to-kubelet
subjects:
  - apiGroup: rbac.authorization.k8s.io
    kind: User
    name: kube-apiserver
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: system:kubernetes
  namespace: ""
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: system:kube-apiserver-to-kubelet
subjects:
  - apiGroup: rbac.authorization.k8s.io
    kind: User
    name: kubernetes
END

kubectl create -f /usr/local/k8s-install/yaml/bootstrap.secret.yaml

十一、部署kubelet

11.1 KubeletConfiguration配置

x509参考文章：https://kubernetes.io/search/?q=x509

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cat > /etc/kubernetes/kubelet-conf.yml <<END
apiVersion: kubelet.config.k8s.io/v1beta1
kind: KubeletConfiguration
address: 0.0.0.0
port: 10250
readOnlyPort: 10255
authentication:
  anonymous:
    enabled: false
  webhook:
    cacheTTL: 2m0s
    enabled: true
  x509:
    clientCAFile: /etc/kubernetes/pki/ca.pem
authorization:
  mode: Webhook
  webhook:
    cacheAuthorizedTTL: 5m0s
    cacheUnauthorizedTTL: 30s
cgroupDriver: systemd
cgroupsPerQOS: true
clusterDNS:
- 10.0.0.2
clusterDomain: cluster.local
featureGates:
  IPv6DualStack: true
containerLogMaxFiles: 5
containerLogMaxSize: 10Mi
contentType: application/vnd.kubernetes.protobuf
cpuCFSQuota: true
cpuManagerPolicy: none
cpuManagerReconcilePeriod: 10s
enableControllerAttachDetach: true
enableDebuggingHandlers: true
enforceNodeAllocatable:
- pods
eventBurst: 10
eventRecordQPS: 5
evictionHard:
  imagefs.available: 15%
  memory.available: 100Mi
  nodefs.available: 10%
  nodefs.inodesFree: 5%
evictionPressureTransitionPeriod: 5m0s  
failSwapOn: true
fileCheckFrequency: 20s
hairpinMode: promiscuous-bridge
healthzBindAddress: 127.0.0.1
healthzPort: 10248
httpCheckFrequency: 20s
imageGCHighThresholdPercent: 85
imageGCLowThresholdPercent: 80
imageMinimumGCAge: 2m0s
iptablesDropBit: 15
iptablesMasqueradeBit: 14
kubeAPIBurst: 10
kubeAPIQPS: 5
makeIPTablesUtilChains: true
maxOpenFiles: 1000000
maxPods: 110
nodeStatusUpdateFrequency: 10s
oomScoreAdj: -999
podPidsLimit: -1
registryBurst: 10
registryPullQPS: 5
resolvConf: /etc/resolv.conf
rotateCertificates: true
runtimeRequestTimeout: 2m0s
serializeImagePulls: true
staticPodPath: /etc/kubernetes/manifests
streamingConnectionIdleTimeout: 4h0m0s
syncFrequency: 1m0s
volumeStatsAggPeriod: 1m0s

END

11.2 服务配置

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cat > /usr/lib/systemd/system/kubelet.service <<END
[Unit]
Description=Kubernetes Kubelet
Documentation=https://github.com/kubernetes/kubernetes
After=containerd.service
Requires=containerd.service

[Service]
ExecStart=/usr/local/bin/kubelet \
    --bootstrap-kubeconfig=/etc/kubernetes/bootstrap-kubelet.conf  \
    --kubeconfig=/etc/kubernetes/kubelet.conf \
    --config=/etc/kubernetes/kubelet-conf.yml \
    --container-runtime=remote \
    --container-runtime-endpoint=unix:///run/containerd/containerd.sock  \
    --node-labels=node.kubernetes.io/node= 

Restart=always
StartLimitInterval=0
RestartSec=10

[Install]
WantedBy=multi-user.target
END

11.3 启动服务及开机设置

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systemctl daemon-reload 
systemctl enable kubelet --now

11.4 批准 kubelet 证书申请并加入集群(这里不需要)

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# 查看 kubelet 证书请求 
[root@k8s-master01 k8s-install]# kubectl get csr
NAME                                                   AGE     SIGNERNAME                                    REQUESTOR           REQUESTEDDURATION   CONDITION
node-csr-NrSNw-Gx8kR7VerABxUgHoM1mu71VbB8x598UXWOwM0   4m12s   kubernetes.io/kube-apiserver-client-kubelet   kubelet-bootstrap   <none>              Pending
# 批准申请 
[root@k8s-master01 k8s-install]# kubectl certificate approve node-csr-NrSNw-Gx8kR7VerABxUgHoM1mu71VbB8x598UXWOwM0
certificatesigningrequest.certificates.k8s.io/node-csr-NrSNw-Gx8kR7VerABxUgHoM1mu71VbB8x598UXWOwM0 approved
# 查看节点 
[root@k8s-master01 k8s-install]# kubectl get node
NAME     STATUS   ROLES    AGE   VERSION
node01   Ready    <none>   19s   v1.24.0

十二、部署kube-proxy

12.1 创建ServiceAccount

非常重要：kubernetes v1.24.0 更新之后进行创建 ServiceAccount 不会自动生成 Secret 需要对其手动创建 

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#创建kube-proxy的sa 
kubectl -n kube-system create serviceaccount kube-proxy

cat<<EOF | kubectl apply -f -
apiVersion: v1
kind: Secret
type: kubernetes.io/service-account-token
metadata:
  name: kube-proxy-token
  namespace: kube-system
  annotations:
    kubernetes.io/service-account.name: "kube-proxy"
EOF

#创建角色绑定
kubectl create clusterrolebinding system:kube-proxy \
--clusterrole system:node-proxier \
--serviceaccount kube-system:kube-proxy

12.2 kubeconfig 配置

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JWT_TOKEN=$(kubectl -n kube-system get secret/kube-proxy-token --output=jsonpath='{.data.token}' | base64 -d)
KUBE_CONFIG="/etc/kubernetes/kube-proxy.conf"
KUBE_APISERVER="https://192.168.10.10:6443"

kubectl config set-cluster kubernetes \
--certificate-authority=/etc/kubernetes/pki/ca.pem \
--embed-certs=true \
--server=${KUBE_APISERVER} \
--kubeconfig=${KUBE_CONFIG}

kubectl config set-credentials kubernetes \
--token=${JWT_TOKEN} \
--kubeconfig=${KUBE_CONFIG}

kubectl config set-context kubernetes \
--cluster=kubernetes \
--user=kubernetes \
--kubeconfig=${KUBE_CONFIG}

kubectl config use-context kubernetes \
--kubeconfig=${KUBE_CONFIG}

12.3 kube-proxy yaml配置

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cat > /etc/kubernetes/kube-proxy.yaml <<END
apiVersion: kubeproxy.config.k8s.io/v1alpha1
bindAddress: 0.0.0.0
clientConnection:
  acceptContentTypes: ""
  burst: 10
  contentType: application/vnd.kubernetes.protobuf
  kubeconfig: /etc/kubernetes/kube-proxy.conf  
  qps: 5
clusterCIDR: 10.244.0.0/16  
configSyncPeriod: 15m0s
conntrack:
  maxPerCore: 32768
  min: 131072
  tcpCloseWaitTimeout: 1h0m0s
  tcpEstablishedTimeout: 24h0m0s
enableProfiling: false
healthzBindAddress: 0.0.0.0:10256
hostnameOverride: ""
iptables:
  masqueradeAll: false
  masqueradeBit: 14
  minSyncPeriod: 0s
  syncPeriod: 30s
ipvs:
  minSyncPeriod: 5s
  scheduler: "rr"
  syncPeriod: 30s
kind: KubeProxyConfiguration
metricsBindAddress: 127.0.0.1:10249
mode: "ipvs"
nodePortAddresses: null
oomScoreAdj: -999
portRange: ""
udpIdleTimeout: 250ms
END

12.4 服务配置

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cat > /usr/lib/systemd/system/kube-proxy.service <<END
[Unit]
Description=Kubernetes Kube Proxy
Documentation=https://github.com/kubernetes/kubernetes
After=network.target

[Service]
ExecStart=/usr/local/bin/kube-proxy \
  --config=/etc/kubernetes/kube-proxy.yaml \
  --v=2

Restart=always
RestartSec=10s

[Install]
WantedBy=multi-user.target
END

12.5 启动并设置开机启动

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systemctl daemon-reload 
systemctl enable kube-proxy --now

十三、部署 CNI 网络

13.1 下载安装

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cd /usr/local/k8s-install/yaml
wget https://docs.projectcalico.org/manifests/calico.yaml --no-check-certificate
# 修改CALICO_IPV4POOL_CIDR  10.244.0.0/16
kubectl apply -f calico.yaml

13.2 查看

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kubectl get pods -n kube-system 
kubectl get node

十四、部署CoreDNS

14.1 保持配置

在前面配置中：

/usr/lib/systemd/system/kube-apiserver.service：

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--service-cluster-ip-range=10.0.0.0/24

/etc/kubernetes/kubelet-conf.yml中指定

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clusterDNS:
- 10.0.0.2
clusterDomain: cluster.local

安装CoreDNS：（所以安装dns时指定-r 10.0.0.0/24 -i 10.0.0.2及domain cluster.local）

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#jq支持
yum install -y epel-release
yum install -y jq

cd /usr/local/k8s-install/tools/
yum install git -y 
git clone https://github.com/coredns/deployment.git
cd deployment/kubernetes
./deploy.sh -r 10.0.0.0/24 -i 10.0.0.2 -d cluster.local  >  coredns.yaml
kubectl create -f coredns.yaml

十五、新增加 Worker Node

拷贝kubelet和kubeproxy配置及证书，因为在实体机中部署，现在只有单台服务器留到后续更新。。。。

十六、部署nginx测试部署

16.1 部署nginx

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kubectl create deployment nginx --image=nginx
kubectl expose deployment nginx --port=80 --type=NodePort

16.2 查看

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[root@k8s-master01 kubernetes]# kubectl get pod,svc -o wide    
NAME                        READY   STATUS    RESTARTS   AGE     IP              NODE           NOMINATED NODE   READINESS GATES
pod/nginx-8f458dc5b-f7cnd   1/1     Running   0          3m48s   172.16.32.130   k8s-master01   <none>           <none>

NAME                 TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)        AGE     SELECTOR
service/kubernetes   ClusterIP   10.0.0.1     <none>        443/TCP        114m    <none>
service/nginx        NodePort    10.0.0.47    <none>        80:30824/TCP   3m47s   app=nginx

[root@k8s-master01 kubernetes]# ipvsadm -Ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  172.16.32.128:30824 rr
  -> 172.16.32.130:80             Masq    1      0          0         
TCP  192.168.10.10:30824 rr
  -> 172.16.32.130:80             Masq    1      0          1         
TCP  192.168.100.101:30824 rr
  -> 172.16.32.130:80             Masq    1      0          0         
TCP  10.0.0.1:443 rr
  -> 192.168.10.10:6443            Masq    1      6          0         
TCP  10.0.0.2:53 rr
  -> 172.16.32.129:53             Masq    1      0          0         
TCP  10.0.0.2:9153 rr
  -> 172.16.32.129:9153           Masq    1      0          0         
TCP  10.0.0.47:80 rr
  -> 172.16.32.130:80             Masq    1      0          0         
TCP  10.88.0.1:30824 rr
  -> 172.16.32.130:80             Masq    1      0          0         
UDP  10.0.0.2:53 rr
  -> 172.16.32.129:53             Masq    1      0          0

网络转发分析：

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192.168.10.10:30824->172.16.32.130:80

16.3 http访问

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[root@k8s-master01 kubernetes]# curl http://192.168.10.10:30824/
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
html { color-scheme: light dark; }
body { width: 35em; margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif; }
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>

<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>

<p><em>Thank you for using nginx.</em></p>
</body>
</html>

注意：网上文章大多时各种抄袭，可能都没有验证

参考文章：

https://cby-chen.github.io/2022/06/15/2022-06-15-%E4%BA%8C%E8%BF%9B%E5%88%B6%E5%AE%89%E8%A3%85Kubernetes%EF%BC%88k8s%EF%BC%89_v1.23.7_IPv4_IPv6%E5%8F%8C%E6%A0%88/

https://zhuanlan.zhihu.com/p/547498632

PKI 证书和要求 | Kubernetes

服务器 > k8s
#kubernetes #k8s
二进制部署kubernetes集群的推荐方式
https://leellun.github.io/2022/11/02/k8s/集群/二进制部署傻逼教程/
作者
leellun
发布于
2022年11月2日
许可协议