Kubernetes集群部署之五node节点部署详解架构师

部署kubelet:

1.二进制包准备将软件包可执行文件从k8s-master复制到node节点中去。

[[email protected] ~]# cd /usr/local/src/kubernetes/server/bin 
[[email protected]-master bin]# scp kubelet kube-proxy 10.200.3.106:/opt/kubernetes/bin/ 
[[email protected]-master bin]# scp kubelet kube-proxy 10.200.3.107:/opt/kubernetes/bin/

2.创建角色绑定

[[email protected] ~]# cd /usr/local/src/ssl/ 
[[email protected]-master ssl]#  kubectl create clusterrolebinding kubelet-bootstrap / 
  --clusterrole=system:node-bootstrapper / 
  --user=kubelet-bootstrap 
 
clusterrolebinding "kubelet-bootstrap" createdclusterrolebinding.rbac.authorization.k8s.io "kubelet-bootstrap" created

3.创建 kubelet bootstrap.kubeconfig 文件设置集群参数

[[email protected] ssl]#  kubectl config set-cluster kubernetes / 
   --certificate-authority=/opt/kubernetes/ssl/ca.pem / 
   --embed-certs=true / 
   --server=https://10.200.3.105:6443 / 
   --kubeconfig=bootstrap.kubeconfig 
 
Cluster "kubernetes" set.

4.设置客户端认证参数,token值为之前生成的.

[[email protected] ssl]# kubectl config set-credentials kubelet-bootstrap / 
   --token=10a89e49bc403bce8fb134e5a2ae82f1 / 
   --kubeconfig=bootstrap.kubeconfig 
 
User "kubelet-bootstrap" set.

5.设置上下文参数

[[email protected] ssl]# kubectl config set-context default / 
   --cluster=kubernetes / 
   --user=kubelet-bootstrap / 
   --kubeconfig=bootstrap.kubeconfig 
       
Context "default" created.

6.选择默认上下文并向node节点分发在master端生成的bootstrap.kubeconfig文件.

[[email protected] ssl]# kubectl config use-context default --kubeconfig=bootstrap.kubeconfig 
Switched to context "default". 
 
[[email protected]-master ssl]# cp bootstrap.kubeconfig /opt/kubernetes/cfg 
[[email protected]-master ssl]# scp bootstrap.kubeconfig 10.200.3.106:/opt/kubernetes/cfg 
[[email protected]-master ssl]# scp bootstrap.kubeconfig 10.200.3.107:/opt/kubernetes/cfg

部署kubelet(node节点操作).

1.设置CNI支持.

[root@k8s-node-1 ~]# mkdir -p /etc/cni/net.d 
[[email protected]-node-1 ~]# cat > /etc/cni/net.d/10-default.conf <<EOF 
{ 
        "name": "flannel", 
        "type": "flannel", 
        "delegate": { 
            "bridge": "docker0", 
            "isDefaultGateway": true, 
            "mtu": 1400 
        } 
} 
 
EOF

2.创建kubelet目录

[root@k8s-node-1 ~]# mkdir /var/lib/kubelet

3.创建kubelet服务配置

[root@k8s-node-1 ~]# cat > /usr/lib/systemd/system/kubelet.service <<EOF 
[Unit] 
Description=Kubernetes Kubelet 
Documentation=https://github.com/GoogleCloudPlatform/kubernetes 
After=docker.service 
Requires=docker.service 
 
[Service] 
WorkingDirectory=/var/lib/kubelet 
ExecStart=/opt/kubernetes/bin/kubelet / 
  --address=10.200.3.106 / 
  --hostname-override=10.200.3.106 / 
  --pod-infra-container-image=mirrorgooglecontainers/pause-amd64:3.0 / 
  --experimental-bootstrap-kubeconfig=/opt/kubernetes/cfg/bootstrap.kubeconfig / 
  --kubeconfig=/opt/kubernetes/cfg/kubelet.kubeconfig / 
  --cert-dir=/opt/kubernetes/ssl / 
  --network-plugin=cni / 
  --cni-conf-dir=/etc/cni/net.d / 
  --cni-bin-dir=/opt/kubernetes/bin/cni / 
  --cluster-dns=10.1.0.2 / 
  --cluster-domain=cluster.local. / 
  --hairpin-mode hairpin-veth / 
  --allow-privileged=true / 
  --fail-swap-on=false / 
  --logtostderr=true / 
  --v=2 / 
  --logtostderr=false / 
  --log-dir=/opt/kubernetes/log 
Restart=on-failure 
RestartSec=5 
 
EOF

4.启动Kubelet

[root@k8s-node-1 ~]# systemctl daemon-reload 
[[email protected]-node-1 ~]# systemctl enable kubelet 
[[email protected]-node-1 ~]# systemctl start kubelet 
[[email protected]-node-1 ~]# systemctl status kubelet

5.查看csr请求注意是在k8s-maste上执行

[[email protected] ssl]# kubectl get csr 
NAME                                                   AGE       REQUESTOR           CONDITION 
node-csr-exRV4L4JbdyoO62eNEcTnSK7ehYji_47xhkU7e5-L5c   43s       kubelet-bootstrap   Pending

6.批准kubelet 的 TLS 证书请求

[[email protected] ssl]# kubectl get csr|grep 'Pending' | awk 'NR>0{print $1}'| xargs kubectl certificate approve 
certificatesigningrequest.certificates.k8s.io "node-csr-exRV4L4JbdyoO62eNEcTnSK7ehYji_47xhkU7e5-L5c" approved

执行完毕后，查看节点状态如果是Ready的状态就说明一切正常.

[[email protected] ~]# kubectl get node 
NAME           STATUS    ROLES     AGE       VERSION 
10.200.3.106   Ready     <none>    1d        v1.10.1

部署Kubernetes Proxy

1.配置kube-proxy使用LVS

# yum install -y ipvsadm ipset conntrack

2.创建 kube-proxy 证书请求

[[email protected] ~]# cd /usr/local/src/ssl/ 
[[email protected]-master ssl]# cat > kube-proxy-csr.json <<EOF 
 
{ 
  "CN": "system:kube-proxy", 
  "hosts": [], 
  "key": { 
    "algo": "rsa", 
    "size": 2048 
  }, 
  "names": [ 
    { 
      "C": "CN", 
      "ST": "BeiJing", 
      "L": "BeiJing", 
      "O": "k8s", 
      "OU": "System" 
    } 
  ] 
} 
 
EOF

3.生成证书，并分发至node节点.

[[email protected] ssl]#cfssl gencert -ca=/opt/kubernetes/ssl/ca.pem / 
   -ca-key=/opt/kubernetes/ssl/ca-key.pem / 
   -config=/opt/kubernetes/ssl/ca-config.json / 
   -profile=kubernetes  kube-proxy-csr.json | cfssljson -bare kube-proxy 
    
[[email protected]-master ssl]# cp kube-proxy*.pem /opt/kubernetes/ssl/ 
[[email protected]-master ssl]# scp kube-proxy*.pem 10.200.3.106:/opt/kubernetes/ssl/ 
[[email protected]-master ssl]# scp kube-proxy*.pem 10.200.3.107:/opt/kubernetes/ssl/

4.创建kube-proxy配置文件

[[email protected] ssl]# kubectl config set-cluster kubernetes / 
   --certificate-authority=/opt/kubernetes/ssl/ca.pem / 
   --embed-certs=true / 
   --server=https://10.200.3.105:6443 / 
   --kubeconfig=kube-proxy.kubeconfig 
    
Cluster "kubernetes" set. 
 
[[email protected]-master ssl]#kubectl config set-credentials kube-proxy / 
   --client-certificate=/opt/kubernetes/ssl/kube-proxy.pem / 
   --client-key=/opt/kubernetes/ssl/kube-proxy-key.pem / 
   --embed-certs=true / 
   --kubeconfig=kube-proxy.kubeconfig 
 
User "kube-proxy" set. 
 
[[email protected]-master ssl]#kubectl config set-context default / 
   --cluster=kubernetes / 
   --user=kube-proxy / 
   --kubeconfig=kube-proxy.kubeconfig 
Context "default" created. 
 
[[email protected]-master ssl]# kubectl config use-context default --kubeconfig=kube-proxy.kubeconfig 
Switched to context "default".

6.分发kubeconfig配置文件到各节点.

[[email protected] ssl]# cp kube-proxy.kubeconfig /opt/kubernetes/cfg/ 
[[email protected]-master ssl]# scp kube-proxy.kubeconfig 10.200.3.106:/opt/kubernetes/cfg/ 
[[email protected]-master ssl]# scp kube-proxy.kubeconfig 10.200.3.107:/opt/kubernetes/cfg/

7.创建kube-proxy服务配置

[root@k8s-node-1 ~]# mkdir /var/lib/kube-proxy 
[[email protected]-node-1 ~]# cat > /usr/lib/systemd/system/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/kubernetes/bin/kube-proxy / 
  --bind-address=10.200.3.106 / 
  --hostname-override=10.200.3.106 / 
  --kubeconfig=/opt/kubernetes/cfg/kube-proxy.kubeconfig / 
--masquerade-all / 
  --feature-gates=SupportIPVSProxyMode=true / 
  --proxy-mode=ipvs / 
  --ipvs-min-sync-period=5s / 
  --ipvs-sync-period=5s / 
  --ipvs-scheduler=rr / 
  --logtostderr=true / 
  --v=2 / 
  --logtostderr=false / 
  --log-dir=/opt/kubernetes/log 
 
Restart=on-failure 
RestartSec=5 
LimitNOFILE=65536 
 
[Install] 
WantedBy=multi-user.target 
 
EOF

8.启动Kubernetes Proxy

[root@k8s-node-1 ~]# systemctl daemon-reload 
[[email protected]-node-1 ~]# systemctl enable kube-proxy 
[[email protected]-node-1 ~]# systemctl start kube-proxy 
[[email protected]-node-1 ~]# systemctl status kube-proxy

9.检查LVS状态

[root@k8s-node-1 ~]# ipvsadm -L -n 
IP Virtual Server version 1.2.1 (size=4096) 
Prot LocalAddress:Port Scheduler Flags 
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn 
TCP  10.1.0.1:443 rr persistent 10800 
  -> 10.200.3.105:6443            Masq    1      0          0          
[[email protected]-node-1 ~]#

如果你在两台实验机器都安装了kubelet和proxy服务，使用下面的命令可以检查状态：

[[email protected] ~]# kubectl get nodes 
 
NAME           STATUS    ROLES     AGE       VERSION 
10.200.3.106   Ready     <none>    3h        v1.10.1 
10.200.3.107   Ready     <none>    29m       v1.10.1

原创文章，作者：奋斗，如若转载，请注明出处：https://blog.ytso.com/6895.html

Kubernetes集群部署之五node节点部署详解架构师

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