kubernetes-1.11.0集群部署之node集群 (三)

kubernetes-1.11.0集群部署之node集群 (三)

Node 配置

 单Node 部分需要部署的组建有docker，calico，kubelet，kube-proxy这几个组件。Node 节点基于nginx 负载API 做Master  HA
在每个node 上启动一个nginx，每个nginx 反向代理所有的api  server；
node 上kubelet kube-proxy 连接本地的nginx 代理端口
当nginx 发现无法链接后端时会自动剔除有问题的api server，从而实现api  server  的HA。

创建kebe-proxy 证书
vim  kube-proxy-csr.json

    {
  "CN": "system:kube-proxy",
  "hosts": [],
  "key": {
      "algo": "rsa",
      "size": 2048
   },
  "names": [
   {
      "C": "CN",
      "ST": "BeiJing",
      "L": "BeiJing",
      "O": "k8s",
      "OU": "System"
    }
  ]
}

生成kube-proxy 证书和私钥 
cfssl gencert -ca=ca.pem  -ca-key=ca-key.pem  -config=config.json  -profile=kubernetes  kube-proxy-csr.json | cfssljson -bare kube-proxy   

拷贝到目录
scp kube-proxy*  [email protected]:/etc/kubernetes/ssl/

创建kube-proxy kubeconfig 文件

#配置集群
kubectl config set-cluster kubernetes  --certificate-authority=/etc/kubernetes/ssl/ca.pem  --embed-certs=true --server=https://127.0.0.1:6443  --kubeconfig=kube-proxy.kubeconfig

#配置客户端认证
kubectl config set-credentials kube-proxy --client-certificate=/etc/kubernetes/ssl/kube-proxy.pem --client-key=/etc/kubernetes/ssl/kube-proxy-key.pem --embed-certs=true --kubeconfig=kube-proxy.kubeconfig

#配置关联
kubectl config set-context default --cluster=kubernetes --user=kube-proxy  --kubeconfig=kube-proxy.kubeconfig

#配置默认关联
kubectl config use-context default --kubeconfig=kube-proxy.kubeconfig

#拷贝到其他机器
scp kube-proxy.kubeconfig [email protected]:/etc/kubernetes/
scp kube-proxy.kubeconfig [email protected]:/etc/kubernetes/

#创建kube-proxy.service 文件
 需要安装ipvsadm  ipset conntrack软件 
 yum install ipset ipvsadm conntrack-tools.x86_64 -y
cd /etc/kubernetes/ 

vim  kube-proxy.config.yaml 
     apiVersion: kubeproxy.config.k8s.io/v1alpha1
      bindAddress: 10.39.10.160
     clientConnection:
       kubeconfig: /etc/kubernetes/kube-proxy.kubeconfig
     clusterCIDR: 10.254.64.0/18
     healthzBindAddress: 10.39.10.160:10256
     hostnameOverride: kubernetes-master-154
     kind: KubeProxyConfiguration
     metricsBindAddress: 10.39.10.160:10249
     mode: "ipvs"

vi /etc/systemd/system/kube-proxy.service
   [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 \
     --logtostderr=true \
   --v=1     
  Restart=on-failure

  RestartSec=5
  LimitNOFILE=65536

  [Install]
  WantedBy=multi-user.target   

  这个目录/var/lib/kube-proxy 启动的如果失败请手动创建 

启动kube-proxy

 systemctl daemon-reload
  systemctl enable kube-proxy
 systemctl start kube-proxy
 systemctl status kube-proxy

 # 发布证书
 scp ca.pem kube-proxy.pem  kube-proxy-key.pem [email protected]:/etc/kubernetes/ssl/ 

 创建nginx 代理

 yum  install epel-release  -y  
 yum  install nginx -y 

 cat << EOF >> /etc/nginx/nginx.conf
        error_log stderr notice;

        worker_processes auto;
        events {
           multi_accept on;
           use epoll;
           worker_connections 1024;
           }

stream {
upstream kube_apiserver {
    least_conn;
    server 10.39.10.154:6443;
    server 10.39.10.156:6443;
    server 10.39.10.159:6443;
}

server {
    listen      0.0.0.0:6443;
    proxy_pass    kube_apiserver;
    proxy_timeout 10m;
    proxy_connect_timeout 1s;
    }
  }
EOF

# 配置nginx 基于docker 进程，然后配置systemd来启动

 vim /etc/systemd/system/nginx-proxy.service    
 [Unit]
 Description=kubernetes apiserver docker wrapper
 Wants=docker.socket
 After=docker.service

[Service]
User=root
PermissionsStartOnly=true
ExecStart=/usr/bin/docker run -p 127.0.0.1:6443:6443 \
                          -v /etc/nginx:/etc/nginx \
                          --name nginx-proxy \
                          --net=host \
                          --restart=on-failure:5 \
                          --memory=512M \
                          nginx:1.13.7-alpine
ExecStartPre=-/usr/bin/docker rm -f nginx-proxy
ExecStop=/usr/bin/docker stop nginx-proxy
Restart=always
RestartSec=15s
TimeoutStartSec=30s

[Install]
WantedBy=multi-user.target

# 启动nginx
systemctl daemon-reload
 systemctl start nginx-proxy
systemctl enable nginx-proxy
systemctl status nginx-proxy

配置kubelet.service 文件

vi /etc/systemd/system/kubelet.service
   [Unit]
    Description=Kubernetes Kubelet
   Documentation=https://github.com/GoogleCloudPlatform/kubernetes
   After=docker.service
   Requires=docker.service

  [Service]
  WorkingDirectory=/var/lib/kubelet
  ExecStart=/usr/local/bin/kubelet \
    --hostname-override=kubernetes-64 \
    --pod-infra-container-image=harbor.enncloud.cn/enncloud/pause-amd64:3.1 \
    --bootstrap-kubeconfig=/etc/kubernetes/bootstrap.kubeconfig \
    --kubeconfig=/etc/kubernetes/kubelet.kubeconfig \
    --config=/etc/kubernetes/kubelet.config.json \
    --cert-dir=/etc/kubernetes/ssl \
    --logtostderr=true \
    --v=2

 [Install]
 WantedBy=multi-user.target

#创建kubelet config 配置文件
 {
      "kind": "KubeletConfiguration",
      "apiVersion": "kubelet.config.k8s.io/v1beta1",
      "authentication": {
        "x509": {
          "clientCAFile": "/etc/kubernetes/ssl/ca.pem"
        },
        "webhook": {
          "enabled": true,
          "cacheTTL": "2m0s"
        },
        "anonymous": {
          "enabled": false
        }
      },
      "authorization": {
        "mode": "Webhook",
        "webhook": {
          "cacheAuthorizedTTL": "5m0s",
          "cacheUnauthorizedTTL": "30s"
        }
      },
      "address": "172.16.1.66",
      "port": 10250,
      "readOnlyPort": 0,
      "cgroupDriver": "cgroupfs",
      "hairpinMode": "promiscuous-bridge",
      "serializeImagePulls": false,
      "featureGates": {
        "RotateKubeletClientCertificate": true,
        "RotateKubeletServerCertificate": true
      },
      "MaxPods": "512",
      "failSwapOn": false,
      "containerLogMaxSize": "10Mi",
      "containerLogMaxFiles": 5,
      "clusterDomain": "cluster.local.",
      "clusterDNS": ["10.254.0.2"]
    }    

#添加node的token(master操作)  
  kubeadm token create --description kubelet-bootstrap-token --groups system:bootstrappers:kubernetes-node-160 --kubeconfig ~/.kube/config

 #配置集群参数
 kubectl config set-cluster kubernetes   --certificate-authority=/etc/kubernetes/ssl/ca.pem  --embed-certs=true  --server=https://127.0.0.1:6443 --kubeconfig=kubernetes-node-160-bootstrap.kubeconfig

#配置客户端认证
kubectl config set-credentials  kubelet-bootstrap  --token=ap4lcp.3yai1to1f98sfray   --kubeconfig=kubernetes-node-160-bootstrap.kubeconfig

#配置关键
kubectl config set-context default  --cluster=kubernetes  --user=kubelet-bootstrap  --kubeconfig=kubernetes-node-160-bootstrap.kubeconfig

#配置默认关联
 kubectl config use-context default  --kubeconfig=kubernetes-node-160-bootstrap.kubeconfig

拷贝scp kubernetes-node-160-bootstrap.kubeconfig [email protected]:/etc/kubernetes/bootstrap.kubeconfig  

 systemctl    restart  kubelet   

## 如果注册master失败，因为配置写错或者其他原因，需要重新注册的，需要删除原有的一些文件，比如
/etc/kubernetes/ssl 目录下删除kubelet相关的证书和key, 删除/etc/kubernetes下的     kubelet.kubeconfig 文件, 重新启动kubelet 即可，重新生成这些文件

#配置kube-proxy.service 
 vim /etc/kubernetes/kube-proxy.config.yaml 
      apiVersion: kubeproxy.config.k8s.io/v1alpha1
        bindAddress: 10.39.10.160
        clientConnection:
          kubeconfig: /etc/kubernetes/kube-proxy.kubeconfig
        clusterCIDR: 10.254.64.0/18
        healthzBindAddress: 10.39.10.160:10256
        hostnameOverride: kubernetes-node-160
        kind: KubeProxyConfiguration
        metricsBindAddress: 10.39.10.160:10249
        mode: "ipvs"  

#创建kube-proxy目录 
   [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 \
      --logtostderr=true \
      --v=1
    Restart=on-failure
    RestartSec=5
    LimitNOFILE=65536

    [Install]
    WantedBy=multi-user.target  

  #启动
  systemctl start kube-proxy
 systemctl status kube-proxy

验证nodes

 kubectl get nodes

 查看kubelet 生成文件

#配置calico 网络

[https://docs.projectcalico.org/v3.2/getting-started/kubernetes/]()

 1.安装calico 的RBAC角色
  kubectl apply -f \
https://docs.projectcalico.org/v3.2/getting-started/kubernetes/installation/rbac.yaml

 2.安装calico 需要修改配置内容
  kubectl apply -f \
https://docs.projectcalico.org/v3.2/getting-started/kubernetes/installation/hosted/calico.yaml

  修改calico.yaml 
  etcd_endpoints: 这里填写etcd 集群信息
    etcd_ca:   "/calico-secrets/etcd-ca"
    etcd_cert:  "/calico-secrets/etcd-cert"
    etcd_key:   "/calico-secrets/etcd-key"

data:
 # Populate the following files with etcd TLS configuration if desired, but leave blank if
 # not using TLS for etcd.
 # This self-hosted install expects three files with the following names.  The value
  # should be base64 encoded strings of the entire contents of each file.
在这里讲证书编码为base64位然后填写在这里

calico 常用命令

安装calicoctl  
curl -O -L https://github.com/projectcalico/calicoctl/releases/download/v3.2.1/calicoctl   /usr/local/bin/
chmod +x calicoctl

[https://docs.projectcalico.org/v3.1/usage/calicoctl/configure/etcd]()

 创建calicoctl.cfg文件
 vim /etc/calico/calicoctl.cfg 
    apiVersion: projectcalico.org/v3
     kind: CalicoAPIConfig
     metadata:
   spec:
   etcdEndpoints: https://10.39.10.154:2379,https://10.39.10.156:2379,https://10.39.10.160:2379
   etcdKeyFile: /etc/kubernetes/ssl/etcd-key.pem
   etcdCertFile: /etc/kubernetes/ssl/etcd.pem
   etcdCACertFile: /etc/kubernetes/ssl/ca.pem

 就可以执行calicoctl node status 

部署DNS

[wget https://raw.githubusercontent.com/kubernetes/kubernetes/release-1.11/cluster/addons/dns/kube-dns/kube-dns.yaml.base]()

 mv kube-dns.yaml.base   kube-dns.yaml  
 vim  kube-dns.yaml 
      clusterIP: 10.254.0.2
      --domain=cluster.local
      --probe=kubedns,127.0.0.1:10053,kubernetes.default.svc.cluster.local,5,SRV          
      --probe=dnsmasq,127.0.0.1:53,kubernetes.default.svc.cluster.local,5,SRV

 kubectl apply -f kube-dns.yaml