前言

kube-proxy运行在所有worker节点上，它监听apiserver中service和endpoint的变化情况，创建路由规则提供服务IP和负载均衡功能。这里使用ipvs模式的kube-proxy进行部署

在各个节点需要安装ipvsadm和ipset命令，加载ip_vs内核模块

创建kube-proxy证书签名请求

cd /opt/k8s/work
cat > kube-proxy-csr.json <<EOF
{
  "CN": "system:kube-proxy",
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "ST": "BeiJing",
      "L": "BeiJing",
      "O": "k8s",
      "OU": "4Paradigm"
    }
  ]
}
EOF

• CN：指定该证书的 User 为 system:kube-proxy；
• 预定义的 RoleBinding system:node-proxier 将User system:kube-proxy 与 Role system:node-proxier 绑定，该 Role 授予了调用 kube-apiserver Proxy 相关 API 的权限；
• 该证书只会被 kube-proxy 当做 client 证书使用，所以 hosts 字段为空；

生成证书和私钥：

cd /opt/k8s/work
cfssl gencert -ca=/opt/k8s/work/ca.pem   -ca-key=/opt/k8s/work/ca-key.pem   -config=/opt/k8s/work/ca-config.json   -profile=kubernetes  kube-proxy-csr.json | cfssljson -bare kube-proxy
ls kube-proxy*

创建和分发 kubeconfig 文件

cd /opt/k8s/work
source /opt/k8s/bin/environment.sh
kubectl config set-cluster kubernetes   --certificate-authority=/opt/k8s/work/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

• –embed-certs=true：将 ca.pem 和 admin.pem 证书内容嵌入到生成的kubectl-proxy.kubeconfig文件中(不加时，写入的是证书文件路径)；

分发 kubeconfig 文件：

cd /opt/k8s/work
source /opt/k8s/bin/environment.sh
for node_name in ${NODE_NAMES[@]}
  do
    echo ">>> ${node_name}"
    scp kube-proxy.kubeconfig root@${node_name}:/etc/kubernetes/
  done

创建kube-proxy配置文件

从v1.10开始，kube-proxy部分参数可以配置在文件中，可以使用–write-config-to选项生成该配置文件

cd /opt/k8s/work
cat > kube-proxy-config.yaml.template <<EOF
kind: KubeProxyConfiguration
apiVersion: kubeproxy.config.k8s.io/v1alpha1
clientConnection:
  burst: 200
  kubeconfig: "/etc/kubernetes/kube-proxy.kubeconfig"
  qps: 100
bindAddress: ##NODE_IP##
healthzBindAddress: ##NODE_IP##:10256
metricsBindAddress: ##NODE_IP##:10249
enableProfiling: true
clusterCIDR: ${CLUSTER_CIDR}
hostnameOverride: ##NODE_NAME##
mode: "ipvs"
portRange: ""
kubeProxyIPTablesConfiguration:
  masqueradeAll: false
kubeProxyIPVSConfiguration:
  scheduler: rr
  excludeCIDRs: []
EOF

• bindAddress: 监听地址；
• clientConnection.kubeconfig: 连接 apiserver 的 kubeconfig 文件；
• -clusterCIDR: kube-proxy 根据 –cluster-cidr判断集群内部和外部流量，指定 –cluster-cidr 或 –masquerade-all 选项后 kube-proxy 才会对访问 Service IP 的请求做 SNAT；
• hostnameOverride: 参数值必须与 kubelet 的值一致，否则 kube-proxy * 启动后会找不到该 Node，从而不会创建任何 ipvs 规则；
• mode: 使用 ipvs 模式；

分发和创建kube-proxy配置文件

cd /opt/k8s/work
source /opt/k8s/bin/environment.sh
for (( i=0; i < 4; i++ ))
  do 
    echo ">>> ${NODE_NAMES[i]}"
    sed -e "s/##NODE_NAME##/${NODE_NAMES[i]}/" -e "s/##NODE_IP##/${NODE_IPS[i]}/" kube-proxy-config.yaml.template > kube-proxy-config-${NODE_NAMES[i]}.yaml.template
    scp kube-proxy-config-${NODE_NAMES[i]}.yaml.template root@${NODE_NAMES[i]}:/etc/kubernetes/kube-proxy-config.yaml
  done

 #我这里一共有4个节点要运行，所以这里写4，这是整个集群的node节点的数量！ 这里一定要注意修改！！

创建和分发 kube-proxy systemd unit 文件

cd /opt/k8s/work
source /opt/k8s/bin/environment.sh
cat > kube-proxy.service <<EOF
[Unit]
Description=Kubernetes Kube-Proxy Server
Documentation=https://github.com/GoogleCloudPlatform/kubernetes
After=network.target
[Service]
WorkingDirectory=${K8S_DIR}/kube-proxy
ExecStart=/opt/k8s/bin/kube-proxy \  --config=/etc/kubernetes/kube-proxy-config.yaml \  --logtostderr=true \  --v=2
Restart=on-failure
RestartSec=5
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
EOF

分发 kube-proxy systemd unit 文件：

cd /opt/k8s/work
source /opt/k8s/bin/environment.sh
for node_name in ${NODE_NAMES[@]}
  do 
    echo ">>> ${node_name}"
    scp kube-proxy.service root@${node_name}:/etc/systemd/system/
  done

启动 kube-proxy 服务

cd /opt/k8s/work
source /opt/k8s/bin/environment.sh
for node_ip in ${NODE_IPS[@]}
  do
    echo ">>> ${node_ip}"
    ssh root@${node_ip} "mkdir -p ${K8S_DIR}/kube-proxy"
    ssh root@${node_ip} "modprobe ip_vs_rr"
    ssh root@${node_ip} "systemctl daemon-reload && systemctl enable kube-proxy && systemctl restart kube-proxy"
  done

检查启动结果

source /opt/k8s/bin/environment.sh
for node_ip in ${NODE_IPS[@]}
  do
    echo ">>> ${node_ip}"
    ssh root@${node_ip} "systemctl status kube-proxy|grep Active"
  done

检查监听端口

source /opt/k8s/bin/environment.sh
for node_ip in ${NODE_IPS[@]}
  do
    echo ">>> ${node_ip}"
    ssh root@${node_ip} "netstat -lnpt|grep kube-prox"
  done

查看ipvs路由规则

source /opt/k8s/bin/environment.sh
for node_ip in ${NODE_IPS[@]}
  do
    echo ">>> ${node_ip}"
    ssh root@${node_ip} "/usr/sbin/ipvsadm -ln"
  done

部署kube-proxy组件

原文：https://www.cnblogs.com/winstom/p/11992172.html