Kubernetes集群部署之五node节点部署

时间：2021-09-07 05:16:17

Node节点是Kubernetes集群中的工作负载节点.每个node都会被master分配一些工作负载,每个node节点都运行以下关键服务进程.
Kubelet :负责pod对应的容器的创建、启停等任务，同时与master节点密切协作，实现集群管理的基本功能.
Kube-proxy: 实现kubernetes service的通信与负载均衡机制的重要组件.

Docker Engine(docker): Docker引擎，负责本机的容器创建和管理工作.

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。

[root@k8s-master ~]# cd /usr/local/src/kubernetes/server/bin

[root@k8s-master bin]# scp kubelet kube-proxy 10.200.3.106:/opt/kubernetes/bin/

[root@k8s-master bin]# scp kubelet kube-proxy 10.200.3.107:/opt/kubernetes/bin/

2.创建角色绑定

[root@k8s-master ~]# cd /usr/local/src/ssl/

[root@k8s-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

[root@k8s-master 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.

[root@k8s-master ssl]# kubectl config set-credentials kubelet-bootstrap \

   --token=10a89e49bc403bce8fb134e5a2ae82f1 \

   --kubeconfig=bootstrap.kubeconfig

User "kubelet-bootstrap" set.

5.设置上下文参数

[root@k8s-master 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.

[root@k8s-master ssl]# kubectl config use-context default --kubeconfig=bootstrap.kubeconfig

Switched to context "default".

[root@k8s-master ssl]# cp bootstrap.kubeconfig /opt/kubernetes/cfg

[root@k8s-master ssl]# scp bootstrap.kubeconfig 10.200.3.106:/opt/kubernetes/cfg

[root@k8s-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- ~]# mkdir -p /etc/cni/net.d

[root@k8s-node- ~]# cat > /etc/cni/net.d/-default.conf <<EOF

{

        "name": "flannel",

        "type": "flannel",

        "delegate": {

            "bridge": "docker0",

            "isDefaultGateway": true,

            "mtu":

        }

}

EOF

2.创建kubelet目录

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

3.创建kubelet服务配置

[root@k8s-node- ~]# 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= \

  --logtostderr=false \

  --log-dir=/opt/kubernetes/log

Restart=on-failure

RestartSec=

EOF

4.启动Kubelet

[root@k8s-node- ~]# systemctl daemon-reload

[root@k8s-node- ~]# systemctl enable kubelet

[root@k8s-node- ~]# systemctl start kubelet

[root@k8s-node- ~]# systemctl status kubelet

5.查看csr请求 注意是在k8s-maste上执行

[root@k8s-master 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

[root@k8s-master 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.

[root@k8s-master ~]# 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

[root@v0-k8s-node-1]# yum install -y ipvsadm ipset conntrack

2.创建 kube-proxy 证书请求

[root@k8s-master ~]# cd /usr/local/src/ssl/

[root@k8s-master ssl]# cat > kube-proxy-csr.json <<EOF

{

  "CN": "system:kube-proxy",

  "hosts": [],

  "key": {

    "algo": "rsa",

    "size":

  },

  "names": [

    {

      "C": "CN",

      "ST": "BeiJing",

      "L": "BeiJing",

      "O": "k8s",

      "OU": "System"

    }

  ]

}

EOF

3.生成证书，并分发至node节点.

[root@k8s-master 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

[root@k8s-master ssl]# cp kube-proxy*.pem /opt/kubernetes/ssl/

[root@k8s-master ssl]# scp kube-proxy*.pem 10.200.3.106:/opt/kubernetes/ssl/

[root@k8s-master ssl]# scp kube-proxy*.pem 10.200.3.107:/opt/kubernetes/ssl/

4.创建kube-proxy配置文件

[root@k8s-master 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.

[root@k8s-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.

[root@k8s-master ssl]#kubectl config set-context default \

   --cluster=kubernetes \

   --user=kube-proxy \

   --kubeconfig=kube-proxy.kubeconfig

Context "default" created.

[root@k8s-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.

[root@k8s-master ssl]# cp kube-proxy.kubeconfig /opt/kubernetes/cfg/

[root@k8s-master ssl]# scp kube-proxy.kubeconfig 10.200.3.106:/opt/kubernetes/cfg/

[root@k8s-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- ~]# mkdir /var/lib/kube-proxy

[root@k8s-node- ~]# 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= \

  --logtostderr=false \

  --log-dir=/opt/kubernetes/log

Restart=on-failure

RestartSec=

LimitNOFILE=

[Install]

WantedBy=multi-user.target

EOF

8.启动Kubernetes Proxy

[root@k8s-node- ~]# systemctl daemon-reload

[root@k8s-node- ~]# systemctl enable kube-proxy

[root@k8s-node- ~]# systemctl start kube-proxy

[root@k8s-node- ~]# systemctl status kube-proxy

9.检查LVS状态

[root@k8s-node- ~]# ipvsadm -L -n

IP Virtual Server version 1.2. (size=)

Prot LocalAddress:Port Scheduler Flags

  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn

TCP  10.1.0.1: rr persistent

  -> 10.200.3.105:            Masq

[root@k8s-node- ~]#

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@k8s-master ~]# 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

参考文档：https://github.com/unixhot/salt-kubernetes/blob/master/docs/node.md

相关文章