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08.部署 kube-proxy 组件.md

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8.部署 kube-proxy 组件

创建 kube-proxy 证书签名请求

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

生成证书和私钥

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

创建和分发 kubeconfig 文件

export NODE_NAMES=(k8s-m01 k8s-m02 k8s-m03 k8s-n01 k8s-n02)
export MASTER_VIP=192.168.133.200
export KUBE_APISERVER="https://${MASTER_VIP}:8443"

kubectl config set-cluster kubernetes \
  --certificate-authority=/etc/kubernetes/ssl/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

分发文件

for node_name in ${NODE_NAMES[@]}
  do
    echo ">>> ${node_name}"
    scp kube-proxy.kubeconfig ${node_name}:/etc/kubernetes/
  done

创建 kube-proxy 配置文件

export CLUSTER_CIDR="172.30.0.0/16"

cat >kube-proxy.config.yaml.template <<EOF
apiVersion: kubeproxy.config.k8s.io/v1alpha1
bindAddress: ##NODE_IP##
clientConnection:
  kubeconfig: /etc/kubernetes/kube-proxy.kubeconfig
clusterCIDR: ${CLUSTER_CIDR}
healthzBindAddress: ##NODE_IP##:10256
hostnameOverride: ##NODE_NAME##
kind: KubeProxyConfiguration
metricsBindAddress: ##NODE_IP##:10249
mode: "ipvs"
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；

为各节点创建和分发 kube-proxy 配置文件：

export NODE_NAMES=(k8s-m01 k8s-m02 k8s-m03 k8s-n01 k8s-n02)
for (( i=0; i < 5; i++ ))
  do 
    echo ">>> ${NODE_NAMES[i]}"
    sed -e "s/##NODE_NAME##/${NODE_NAMES[i]}/" -e "s/##NODE_IP##/${NODE_IPS[i]}/" kube-proxy.config.yaml.template > kube-proxy-${NODE_NAMES[i]}.config.yaml
    scp kube-proxy-${NODE_NAMES[i]}.config.yaml root@${NODE_NAMES[i]}:/etc/kubernetes/kube-proxy.config.yaml
  done

创建和分发 kube-proxy systemd unit 文件

cat > kube-proxy.service <<EOF
[Unit]
Description=Kubernetes Kube-Proxy Server
Documentation=https://github.com/GoogleCloudPlatform/kubernetes
After=network.target

[Service]
WorkingDirectory=/var/lib/kube-proxy
ExecStart=/usr/local/bin/kube-proxy \\
  --config=/etc/kubernetes/kube-proxy.config.yaml \\
  --alsologtostderr=true \\
  --logtostderr=false \\
  --log-dir=/var/log/kubernetes \\
  --v=2
Restart=on-failure
RestartSec=5
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target
EOF

分发 kube-proxy systemd unit 文件：

export NODE_NAMES=(k8s-m01 k8s-m02 k8s-m03 k8s-n01 k8s-n02)
for node_name in ${NODE_NAMES[@]}
  do 
    echo ">>> ${node_name}"
    scp kube-proxy.service root@${node_name}:/usr/lib/systemd/system/
  done

启动 kube-proxy 服务

mkdir -p /var/lib/kube-proxy
mkdir -p /var/log/kubernetes
systemctl daemon-reload && systemctl enable kube-proxy && systemctl restart kube-proxy

查看 ipvs 路由规则

export NODE_IPS=(192.168.133.128 192.168.133.129 192.168.133.130 192.168.133.131 192.168.133.132)
for node_ip in ${NODE_IPS[@]}
  do
    echo ">>> ${node_ip}"
    ssh root@${node_ip} "/usr/sbin/ipvsadm -ln"
  done

可见将所有到 kubernetes cluster ip 443 端口的请求都转发到 kube-apiserver 的 6443 端口；