kubernetes Node节点部署（四）

一、部署kubelet

1.1、二进制包准备将软件包从linux-node1复制到linux-node2中去

[root@linux-node1 ~]# cd /usr/local/src/kubernetes/server/bin/
[root@linux-node1 bin]# cp kubelet kube-proxy /opt/kubernetes/bin/
[root@linux-node1 bin]# scp kubelet kube-proxy 192.168.56.12:/opt/kubernetes/bin/
[root@linux-node1 bin]# scp kubelet kube-proxy 192.168.56.13:/opt/kubernetes/bin/

1.2、创建角色绑定

[root@linux-node1 ~]# kubectl create clusterrolebinding kubelet-bootstrap --clusterrole=system:node-bootstrapper --user=kubelet-bootstrap
clusterrolebinding "kubelet-bootstrap" created

1.3、创建 kubelet bootstrapping kubeconfig 文件设置集群参数

[root@linux-node1 ~]# kubectl config set-cluster kubernetes 
   --certificate-authority=/opt/kubernetes/ssl/ca.pem 
   --embed-certs=true 
   --server=https://192.168.56.11:6443 
   --kubeconfig=bootstrap.kubeconfig
Cluster "kubernetes" set.

1.4、设置客户端认证参数

[root@linux ssl]# kubectl config set-credentials kubelet-bootstrap 
>    --token=d192434528f7576911ac9d333a982d93 
>    --kubeconfig=bootstrap.kubeconfig   
User "kubelet-bootstrap" set.

注：d192434528f7576911ac9d333a982d93 根据实际情况填写，可以通过cat /opt/kubernetes/ssl/bootstrap-token.csv 查看

1.5、设置上下文参数

[root@linux-node1 ~]# kubectl config set-context default 
   --cluster=kubernetes 
   --user=kubelet-bootstrap 
   --kubeconfig=bootstrap.kubeconfig
Context "default" created.

1.6、选择默认上下文

[root@linux-node1 ~]# kubectl config use-context default --kubeconfig=bootstrap.kubeconfig
Switched to context "default".
[root@linux-node1 kubernetes]# cp bootstrap.kubeconfig /opt/kubernetes/cfg
[root@linux-node1 kubernetes]# scp bootstrap.kubeconfig 192.168.56.12:/opt/kubernetes/cfg
[root@linux-node1 kubernetes]# scp bootstrap.kubeconfig 192.168.56.13:/opt/kubernetes/cfg

1.7、部署kubelet 1.设置CNI支持（所有节点执行）

[root@linux-node2 ~]# mkdir -p /etc/cni/net.d
[root@linux-node2 ~]# vim /etc/cni/net.d/10-default.conf
{
        "name": "flannel",
        "type": "flannel",
        "delegate": {
            "bridge": "docker0",
            "isDefaultGateway": true,
            "mtu": 1400
        }
}

[root@linux ssl]# scp /etc/cni/net.d/10-default.conf 192.168.56.12:/etc/cni/net.d/
[root@linux ssl]# scp /etc/cni/net.d/10-default.conf 192.168.56.13:/etc/cni/net.d/

1.8、创建kubelet目录（所有节点执行）

[root@linux-node2 ~]# mkdir /var/lib/kubelet

1.9、创建kubelet服务配置（每个节点执行）

[root@k8s-node2 ~]# vim /usr/lib/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=/opt/kubernetes/bin/kubelet 
  --address=192.168.56.12 
  --hostname-override=192.168.56.12 
  --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

注：修改每个节点对应的ip

1.10.启动Kubelet

[root@linux-node2 ~]# systemctl daemon-reload
[root@linux-node2 ~]# systemctl enable kubelet
[root@linux-node2 ~]# systemctl start kubelet

只在node节点上启动，master不用启动

1.11、查看csr请求注意是在linux-node1上执行。

[root@linux ssl]# kubectl get csr
NAME                                                   AGE       REQUESTOR           CONDITION
node-csr-JvaaEZ211tAksrMkeWzInQroN1O4s8rKqqwT9RC4ubA   1m        kubelet-bootstrap   Pending
node-csr-lcMGqB_XHi4lQIKZr2oRdseQ4_IVn-lZx3_SmLLd1i0   1m        kubelet-bootstrap   Pending

1.12、批准kubelet 的 TLS 证书请求

kubectl get csr|grep 'Pending' | awk 'NR>0{print $1}'| xargs kubectl certificate approve

执行完毕后，查看节点状态已经是Ready的状态了

[root@linux ssl]# kubectl get node
NAME            STATUS    ROLES     AGE       VERSION
192.168.56.12   Ready     <none>    3m        v1.10.1
192.168.56.13   Ready     <none>    3m        v1.10.1

二、Kubernetes Proxy

2.1、配置kube-proxy使用LVS（每个节点安装）

yum install -y ipvsadm ipset conntrack

2.2、在master节点上创建 kube-proxy 证书请求

[root@linux-node1 ~]# cd /usr/local/src/ssl/
[root@linux-node1 ~]# 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"
    }
  ]
}

2.3、生成证书

[root@linux-node1~]# 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

2.4、分发证书到所有Node节点

[root@linux-node1 ssl]# cp kube-proxy*.pem /opt/kubernetes/ssl/
[root@linux-node1 ssl]# scp kube-proxy*.pem 192.168.56.12:/opt/kubernetes/ssl/
[root@linux-node1 ssl]# scp kube-proxy*.pem 192.168.56.13:/opt/kubernetes/ssl/

2.5、创建kube-proxy配置文件

[root@linux-node2 ~]# kubectl config set-cluster kubernetes 
   --certificate-authority=/opt/kubernetes/ssl/ca.pem 
   --embed-certs=true 
   --server=https://192.168.56.11:6443 
   --kubeconfig=kube-proxy.kubeconfig
Cluster "kubernetes" set.

[root@linux-node2 ~]# 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.

[root@linux-node2 ~]# kubectl config set-context default 
   --cluster=kubernetes 
   --user=kube-proxy 
   --kubeconfig=kube-proxy.kubeconfig
Context "default" created.

[root@linux-node2 ~]# kubectl config use-context default --kubeconfig=kube-proxy.kubeconfig
Switched to context "default".

2.6、分发kubeconfig配置文件

[root@linux-node1 ssl]# cp kube-proxy.kubeconfig /opt/kubernetes/cfg/
[root@linux-node1 ~]# scp kube-proxy.kubeconfig 192.168.56.12:/opt/kubernetes/cfg/
[root@linux-node1 ~]# scp kube-proxy.kubeconfig 192.168.56.13:/opt/kubernetes/cfg/

2.7、创建kube-proxy服务配置（每个节点执行）

[root@linux-node2 bin]# mkdir /var/lib/kube-proxy

[root@k8s-node2 ~]# vim /usr/lib/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=/opt/kubernetes/bin/kube-proxy 
  --bind-address=192.168.56.12 
  --hostname-override=192.168.56.12 
  --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

注：修改对应节点的ip

2.8、启动

[root@linux-node2 ~]# systemctl daemon-reload
[root@linux-node2 ~]# systemctl enable kube-proxy
[root@linux-node2 ~]# systemctl start kube-proxy

2.9、检查lvs状态

[root@linux ssl]# 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
  -> 192.168.56.11:6443           Masq    1      0          0

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：

[root@linux ssl]# kubectl get node
NAME            STATUS    ROLES     AGE       VERSION
192.168.56.12   Ready     <none>    22m       v1.10.1
192.168.56.13   Ready     <none>    22m       v1.10.1