suse 12 二进制部署 Kubernetets 1.19.7 - 第10章 - 部署kube-proxy组件

1.10、部署kube-proxy

• kube-proxy运行在所有node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ipset命令，加载ip_vs内核模块

k8s-02:~ # zypper in ipset
k8s-02:~ # modprobe ip_vs_rr

1.10.0、创建kube-proxy证书

k8s-01:~ # cd /opt/k8s/ssl/
k8s-01:/opt/k8s/ssl # cat > kube-proxy-csr.json <<EOF
{
    
    
  "CN": "system:kube-proxy",
  "key": {
    
    
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
    
    
      "C": "CN",
      "ST": "ShangHai",
      "L": "ShangHai",
      "O": "k8s",
      "OU": "bandian"
    }
  ]
}
EOF

1.10.1、生成kube-proxy证书和秘钥

k8s-01:/opt/k8s/ssl # cfssl gencert -ca=/opt/k8s/ssl/ca.pem \
-ca-key=/opt/k8s/ssl/ca-key.pem \
-config=/opt/k8s/ssl/ca-config.json \
-profile=kubernetes  kube-proxy-csr.json | cfssljson -bare kube-proxy

1.10.2、创建kube-proxy的kubeconfig文件

k8s-01:/opt/k8s/ssl # source /opt/k8s/bin/k8s-env.sh

"设置集群参数"
k8s-01:/opt/k8s/ssl # kubectl config set-cluster kubernetes \
--certificate-authority=/opt/k8s/ssl/ca.pem \
--embed-certs=true \
--server=${KUBE_APISERVER} \
--kubeconfig=kube-proxy.kubeconfig

"设置客户端认证参数"
k8s-01:/opt/k8s/ssl # kubectl config set-credentials kube-proxy \
--client-certificate=kube-proxy.pem \
--client-key=kube-proxy-key.pem \
--embed-certs=true \
--kubeconfig=kube-proxy.kubeconfig

"设置上下文参数"
k8s-01:/opt/k8s/ssl # kubectl config set-context default \
--cluster=kubernetes \
--user=kube-proxy \
--kubeconfig=kube-proxy.kubeconfig

"设置默认上下文"
k8s-01:/opt/k8s/ssl # kubectl config use-context default --kubeconfig=kube-proxy.kubeconfig

1.10.3、创建kube-proxy配置文件

k8s-01:~ # cd /opt/k8s/conf/
k8s-01:/opt/k8s/conf # source /opt/k8s/bin/k8s-env.sh
k8s-01:/opt/k8s/conf # cat > kube-proxy-config.yaml.template <<EOF
apiVersion: kubeproxy.config.k8s.io/v1alpha1
kind: KubeProxyConfiguration
clientConnection:
  burst: 200
  kubeconfig: "/etc/kubernetes/cert/kube-proxy.kubeconfig"
  qps: 100
bindAddress: ##NODE_IP##
healthzBindAddress: ##NODE_IP##:10256
metricsBindAddress: ##NODE_IP##:10249
enableProfiling: true
clusterCIDR: ${CLUSTER_CIDR}
mode: "ipvs"
portRange: ""
EOF

• 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

1.10.4、配置kube-proxy为systemctl启动

k8s-01:~ # cd /opt/k8s/conf/
k8s-01:/opt/k8s/conf # source /opt/k8s/bin/k8s-env.sh
k8s-01:/opt/k8s/conf # cat > kube-proxy.service.template <<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 \\
  --hostname-override=##NODE_IP## \\
  --config=/etc/kubernetes/kube-proxy-config.yaml \\
  --logtostderr=true \\
  --v=2
Restart=on-failure
RestartSec=5
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
EOF

1.10.5、分发kube-proxy证书和文件到其他节点

#!/usr/bin/env bash
source /opt/k8s/bin/k8s-env.sh

for (( i=0; i < 5; i++ ))
do
    sed -e "s/##NODE_IP##/${NODE_IPS[i]}/" /opt/k8s/conf/kube-proxy.service.template > \
           /opt/k8s/conf/kube-proxy-${NODE_IPS[i]}.service
    sed -e "s/##NODE_NAME##/${NODE_NAMES[i]}/" -e "s/##NODE_IP##/${NODE_IPS[i]}/" \
    /opt/k8s/conf/kube-proxy-config.yaml.template > /opt/k8s/conf/kube-proxy-config-${NODE_IPS[i]}.yaml.template
done

for host in ${NODE_IPS[@]}
do
    printf "\e[1;34m${host}\e[0m\n"
    scp /opt/k8s/ssl/kube-proxy.kubeconfig ${host}:/etc/kubernetes/cert
    scp /opt/k8s/conf/kube-proxy-${host}.service ${host}:/etc/systemd/system/kube-proxy.service
    scp /opt/k8s/conf/kube-proxy-config-${host}.yaml.template \
        ${host}:/etc/kubernetes/kube-proxy-config.yaml
    scp /opt/k8s/packages/conntrack ${host}:/opt/k8s/bin/
    ssh root@${host} "chmod +x /opt/k8s/bin/*"
done

kube-proxy 需要 conntrack 
suse 编译比较麻烦
可以找一个 centos 执行 yum -y install conntrack 
从 /usr/sbin 目录下获取 conntrack 二进制文件，复制到 suse 内使用（如果有下载了前面提供的百度云的连接，里面已经包含了conntrack 二进制）

1.10.6、启动kube-proxy服务

#!/usr/bin/env bash
source /opt/k8s/bin/k8s-env.sh

for host in ${NODE_IPS[@]}
do
    printf "\e[1;34m${host}\e[0m\n"
    ssh root@${host} "mkdir -p ${K8S_DIR}/kube-proxy"
	ssh root@${host} "modprobe ip_vs_rr"
    ssh root@${host} "systemctl daemon-reload && \
                      systemctl enable kube-proxy --now && \
                      systemctl status kube-proxy | grep Active"
done

1.10.7、查看kube-proxy端口

k8s-01:~ # ss -nltp | grep kube-proxy
LISTEN     0      128    192.168.72.25:10249                    *:*                   users:(("kube-proxy",pid=103283,fd=12))
LISTEN     0      128    192.168.72.25:10256                    *:*                   users:(("kube-proxy",pid=103283,fd=13))