Kubernetes实战(九)——Node节点部署

1.部署kubelet

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/

2.创建角色绑定

#kubectl启动的时候需要访问api-server动态获取证书
[root@linux-node1 bin]# kubectl create clusterrolebinding kubelet-bootstrap --clusterrole=system:node-bootstrapper --user=kubelet-bootstrap
clusterrolebinding.rbac.authorization.k8s.io "kubelet-bootstrap" created

3.创建 kubelet bootstrapping kubeconfig 文件，设置集群参数

4.设置客户端认证参数

[root@linux-node1 ssl]# kubectl config set-credentials kubelet-bootstrap \
--token=ad6d5bb607a186796d8861557df0d17f \
--kubeconfig=bootstrap.kubeconfig
User "kubelet-bootstrap" set.
[root@linux-node1 ssl]# ll bootstrap.kubeconfig
-rw------- 1 root root 2086 Sep 23 15:30 bootstrap.kubeconfig

5.设置上下文参数

[root@linux-node1 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

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

7.部署kubelet 1.设置CNI(k8s网络接口插件)支持

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

8.创建kubelet目录

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

9.创建kubelet服务配置

[root@k8s-node2 ~]# 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=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
EOF

10.启动Kubelet

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

11.查看服务状态

[root@linux-node2 kubernetes]# systemctl status kubelet

12.查看csr请求注意是在linux-node1上执行。

[root@linux-node1 kubernetes]# systemctl status kubelet

13.批准kubelet 的 TLS 证书请求

[root@linux-node1 ssl]# kubectl get csr|grep 'Pending' | awk 'NR>0{print $1}'| xargs kubectl certificate approve
certificatesigningrequest.certificates.k8s.io "node-csr-s0I6Fq1DFbi-CY6KtmXsKKR8npGpnVYz5TFQIjF97JI" approved
certificatesigningrequest.certificates.k8s.io "node-csr-sd1_Wsb15BbETUbi5XrAOVVyHs5uFyEce2jNR0ZVEOs" approved
查看可发现多了kubelet-client.crt这个证书
[root@linux-node2 ssl]# ll /opt/kubernetes/ssl/kubelet-client.crt
-rw-r--r-- 1 root root 1046 Sep 23 15:41 /opt/kubernetes/ssl/kubelet-client.crt

执行完毕后，查看节点状态已经是Ready的状态了

[root@linux-node1 ssl]# kubectl get node
NAME            STATUS    ROLES     AGE       VERSION
192.168.56.12   Ready     <none>    29s       v1.10.1
192.168.56.13   Ready     <none>    13s       v1.10.1

2.部署Kubernetes Proxy

1.配置kube-proxy使用LVS

[root@linux-node2 ~]# yum install -y ipvsadm ipset conntrack

2.创建 kube-proxy 证书请求

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

[root@linux-node1 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

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 192.168.56.12:/opt/kubernetes/ssl/

5.创建kube-proxy配置文件

[root@linux-node1 ssl]# 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-node1 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.

[root@linux-node1 ssl]# kubectl config set-context default \
   --cluster=kubernetes \
   --user=kube-proxy \
   --kubeconfig=kube-proxy.kubeconfig
Context "default" created.

[root@linux-node1 ssl]# kubectl config use-context default --kubeconfig=kube-proxy.kubeconfig
Switched to context "default".

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/

7.创建kube-proxy服务配置

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

[root@k8s-node2 ~]# 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=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
EOF

8.启动Kubernetes Proxy

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

9.查看服务状态查看kube-proxy服务状态

[root@linux-node2 ssl]# systemctl status kube-proxy

检查LVS状态
[root@linux-node2 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-node1 ssl]# kubectl get node
NAME            STATUS    ROLES     AGE       VERSION
192.168.56.12   Ready     <none>    11m       v1.10.1
192.168.56.13   Ready     <none>    10m       v1.10.1

linux-node3节点请自行部署，只需修改启动文件里节点IP其余配置与node2相同。

CHEGVA

让我们面对现实让我们忠于理想

Kubernetes实战(九)——Node节点部署

1.部署kubelet

2.部署Kubernetes Proxy

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1.部署kubelet

2.部署Kubernetes Proxy

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