二進制安裝kubernetes v1.11.2 (第十四章 kube-proxy部署)
阿新 • • 發佈:2018-11-06
scheduler ntc ips kubecon .json done ecs rest sna
繼續前一章的部署。
部署 kube-proxy 組件
14.1 下載和分發二進制文件,參考 第三章
分發到各節點
source /opt/k8s/bin/environment.sh for node_name in ${NODE_NAMES[@]} do echo ">>> ${node_name}" scp k8s/v1.11.2/server/kubernetes/server/bin/{kube-proxy,kubelet} k8s@${node_name}:/opt/k8s/bin/ ssh k8s@${node_name} "chmod 755 /opt/k8s/bin/{kube-proxy,kubelet}" done
14.2 安裝依賴包,參考 第十一章
14.3 創建 kube-proxy 證書
cd /opt/k8s/cert
cat > kube-proxy-csr.json <<EOF { "CN": "system:kube-proxy", "key": { "algo": "rsa", "size": 2048 }, "names": [ { "C": "CN", "ST": "BeiJing", "L": "BeiJing", "O": "k8s", "OU": "4Paradigm" } ] } EOF
- CN:指定該證書的 User 為 system:kube-proxy;
- 預定義的 RoleBinding system:node-proxier 將User system:kube-proxy 與 Role system:node-proxier 綁定,該 Role 授予了調用 kube-apiserver Proxy 相關 API 的權限;
- 該證書只會被 kube-proxy 當做 client 證書使用,所以 hosts 字段為空;
生成證書和私鑰:
cfssl gencert -ca=/etc/kubernetes/cert/ca.pem -ca-key=/etc/kubernetes/cert/ca-key.pem-config=/etc/kubernetes/cert/ca-config.json -profile=kubernetes kube-proxy-csr.json | cfssljson -bare kube-proxy
創建和分發 kubeconfig 文件
source /opt/k8s/bin/environment.sh kubectl config set-cluster kubernetes --certificate-authority=/etc/kubernetes/cert/ca.pem --embed-certs=true --server=${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 將 ca.pem和admin.pem 證書內容嵌入到生成的 kubectl-proxy.kubeconfig 文件中(不加時,寫入的是證書文件的路徑)
分發 kubeconfig 文件
source /opt/k8s/bin/environment.sh for node_name in ${NODE_NAMES[@]} do echo ">>> ${node_name}" scp kube-proxy.kubeconfig k8s@${node_name}:/etc/kubernetes/ done
14.3 創建 kube-proxy 配置文件
從 v1.10開始,kube-proxy 部分參數可以在配置文件中配置,可以使用 --write-config-to 選項生成該配置文件,或者參考 kubeproxyconfig 的類型定義源文件:
https://github.com/kubernetes/kubernetes/blob/master/pkg/proxy/apis/kubeproxyconfig/types.go
創建 kube-proxy config 文件模板:
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 監聽地址
- clientConnect.kubeconfig 連接 apiserver 的 kubeconfig 文件
- clusterCIDR kube-proxy 根據 --cluster-cidr 判斷集群內部和外部流量,指定 --cluster-cidr 或 --masquerade-all 選項後 kube-proxy 才會對訪問 Service IP 的請求做 SNAT
- hostnameOverride 參數值必須與 kubelet 的值一致,否則 kube-proxy 啟動後會找不到該 Node ,從而不會創建任何 ipvs 規則
- mode 使用 ipvs 模式
為各節點創建和分發 kube-proxy 配置文件
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##/${NODE_IPS[i]}/" kube-proxy.config.yaml.template > kube-proxy-${NODE_NAMES[i]}.config.yaml scp kube-proxy-${NODE_NAMES[i]}.config.yaml root@${NODE_NAMES[i]}:/etc/kubernetes/kube-proxy.config.yaml done
替換後的 kube-proxy.config.yaml如下
[root@k8s-n2 kubernetes]# cat /etc/kubernetes/kube-proxy.config.yaml apiVersion: kubeproxy.config.k8s.io/v1alpha1 bindAddress: 192.168.56.31 clientConnection: kubeconfig: /etc/kubernetes/kube-proxy.kubeconfig clusterCIDR: 172.30.0.0/16 healthzBindAddress: 192.168.56.31:10256 hostnameOverride: k8s-n2 kind: KubeProxyConfiguration metricsBindAddress: 192.168.56.31:10249 mode: "ipvs"
14.4 創建和分發 kube-proxy systemd unit 文件
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=/var/lib/kube-proxy ExecStart=/opt/k8s/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
分發 kube-proxy systemd unit 文件
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
14.5 啟動 kube-proxy 服務
source /opt/k8s/bin/environment.sh for node_ip in ${NODE_IPS[@]} do echo ">>> ${node_ip}" ssh root@${node_ip} "mkdir -p /var/lib/kube-proxy" ssh root@${node_ip} "mkdir -p /var/log/kubernetes && chown -R k8s /var/log/kubernetes" ssh root@${node_ip} "systemctl daemon-reload && systemctl enable kube-proxy && systemctl restart kube-proxy" done
檢查啟動結果:
source /opt/k8s/bin/environment.sh for node_ip in ${NODE_IPS[@]} do echo ">>> ${node_ip}" ssh k8s@${node_ip} "systemctl status kube-proxy|grep Active" done
- 確保服務是 Active: active (running) 狀態
- 查看日誌: journalctl -u kube-proxy
查看監聽端口和 metrics
[k8s@k8s-m1 template]$ sudo netstat -lnpt|grep kube-prox tcp 0 0 192.168.56.20:10249 0.0.0.0:* LISTEN 729/kube-proxy tcp 0 0 192.168.56.20:10256 0.0.0.0:* LISTEN 729/kube-proxy
- 10249:http prometheus metrics port;
- 10256:http healthz port;
查看 ipvs 路由規則
[k8s@k8s-m1 template]$ source /opt/k8s/bin/environment.sh [k8s@k8s-m1 template]$ for node_ip in ${NODE_IPS[@]} > do > echo ">>> ${node_ip}" > ssh root@${node_ip} "/usr/sbin/ipvsadm -ln" > done >>> 192.168.56.20 IP Virtual Server version 1.2.1 (size=4096) Prot LocalAddress:Port Scheduler Flags -> RemoteAddress:Port Forward Weight ActiveConn InActConn TCP 10.254.0.1:443 rr -> 192.168.56.20:6443 Masq 1 0 0 -> 192.168.56.21:6443 Masq 1 0 0 >>> 192.168.56.21 IP Virtual Server version 1.2.1 (size=4096) Prot LocalAddress:Port Scheduler Flags -> RemoteAddress:Port Forward Weight ActiveConn InActConn TCP 10.254.0.1:443 rr -> 192.168.56.20:6443 Masq 1 0 0 -> 192.168.56.21:6443 Masq 1 0 0 >>> 192.168.56.30 IP Virtual Server version 1.2.1 (size=4096) Prot LocalAddress:Port Scheduler Flags -> RemoteAddress:Port Forward Weight ActiveConn InActConn TCP 10.254.0.1:443 rr -> 192.168.56.20:6443 Masq 1 0 0 -> 192.168.56.21:6443 Masq 1 0 0 >>> 192.168.56.31 IP Virtual Server version 1.2.1 (size=4096) Prot LocalAddress:Port Scheduler Flags -> RemoteAddress:Port Forward Weight ActiveConn InActConn TCP 10.254.0.1:443 rr -> 192.168.56.20:6443 Masq 1 0 0 -> 192.168.56.21:6443 Masq 1 0 0
可以看到,將所有到 kubernetes cluster ip 443 端口的請求都轉發到了 kube-apiserver 的 6443 端口
二進制安裝kubernetes v1.11.2 (第十四章 kube-proxy部署)