基于centos7.9二进制部署kubernetes1.25.4

8、安装Calico

# 以下步骤只在master01执行
[root@k8s-master01 k8s-ha-install]#cd /root/k8s-ha-install/calico/
# 更改calico的网段，主要需要将红色部分的网段，改为自己的Pod网段
[root@k8s-master01 calico]#sed -i "s#POD_CIDR#172.16.0.0/12#g" calico.yaml
# 检查网段是自己的Pod网段， grep "IPV4POOL_CIDR" calico.yaml  -A 1

更改后如下所示:

[root@k8s-master01 calico]# kubectl apply -f calico.yaml

#稍等几分钟，查看pod状态
[root@k8s-master01 k8s-ha-install]# kubectl get pod -n kube-system
NAME                                       READY   STATUS    RESTARTS   AGE
calico-kube-controllers-86d8c4fb68-9wtm4   1/1     Running   0          2m53s
calico-node-kwhrq                          1/1     Running   0          2m52s
calico-node-nm7qs                          1/1     Running   0          2m53s
calico-node-qkzlv                          1/1     Running   0          2m53s
calico-node-tpl5n                          1/1     Running   0          2m53s
calico-typha-768795f74d-bht5m              1/1     Running   0          2m53s

9、安装CoreDNS

# master01

[root@k8s-master01 calico]# cd /root/k8s-ha-install/

# 如果更改了k8s service的网段需要将coredns的serviceIP改成k8s service网段的第十个IP
[root@k8s-master01 k8s-ha-install]# COREDNS_SERVICE_IP=`kubectl get svc | grep kubernetes | awk '{print $3}'`0
[root@k8s-master01 k8s-ha-install]# echo ${COREDNS_SERVICE_IP}
10.96.0.10

[root@k8s-master01 k8s-ha-install]# sed -i "s#KUBEDNS_SERVICE_IP#${COREDNS_SERVICE_IP}#g" CoreDNS/coredns.yaml

# 安装coredns
[root@k8s-master01 k8s-ha-install]# kubectl create -f CoreDNS/coredns.yaml

10、安装Metrics Server

说明：在新版的Kubernetes中系统资源的采集均使用Metrics-server，可以通过Metrics采集节点和Pod的内存、磁盘、CPU和网络的使用率。

# 安装metrics server
[root@k8s-master01 k8s-ha-install]# cd /root/k8s-ha-install/metrics-server
[root@k8s-master01 metrics-server]# ls
comp.yaml

[root@k8s-master01 metrics-server]# kubectl create -f .

[root@k8s-master01 metrics-server]# kubectl get nodes
NAME           STATUS   ROLES    AGE   VERSION
k8s-master01   Ready    <none>   23m   v1.25.4
k8s-master02   Ready    <none>   22m   v1.25.4
k8s-master03   Ready    <none>   65s   v1.25.4
k8s-node01     Ready    <none>   22m   v1.25.4
k8s-node02     Ready    <none>   21m   v1.25.4

11、集群验证

安装busybox
[root@k8s-master01 metrics-server]# cat<<EOF | kubectl apply -f -
apiVersion: v1
kind: Pod
metadata:
  name: busybox
  namespace: default
spec:
  containers:
  - name: busybox
    image: registry.cn-beijing.aliyuncs.com/dotbalo/redis-trib:4.0.10
    command:
      - sleep
      - "3600"
    imagePullPolicy: IfNotPresent
  restartPolicy: Always
EOF
[root@k8s-master01 metrics-server]# kubectl get pod
NAME      READY   STATUS    RESTARTS   AGE
busybox   1/1     Running   0          29s

1.  Pod必须能解析Service
2.  Pod必须能解析跨namespace的Service
3.  每个节点都必须要能访问Kubernetes的kubernetes svc 443和kube-dns的service 53
4.  Pod和Pod之前要能通
a)  同namespace能通信
b)  跨namespace能通信
c)  跨机器能通信

12、安装dashboard

[root@k8s-master01 kubernetes]# cd /root/k8s-ha-install/dashboard/
[root@k8s-master01 dashboard]# kubectl  create -f .

[root@k8s-master01 dashboard]#  kubectl apply -f https://raw.githubusercontent.com/kubernetes/dashboard/v2.0.3/aio/deploy/recommended.yaml

# 创建管理员用户

[root@k8s-master01 dashboard]# vim admin.yaml
apiVersion: v1
kind: ServiceAccount
metadata:
  name: admin-user
  namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding 
metadata: 
  name: admin-user
  annotations:
    rbac.authorization.kubernetes.io/autoupdate: "true"
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: cluster-admin
subjects:
- kind: ServiceAccount
  name: admin-user
  namespace: kube-system

[root@k8s-master01 dashboard]# kubectl apply -f admin.yaml -n kube-system

# 查看token值（注意不要复制到空格）：
[root@k8s-master01 dashboard]# kubectl -n kube-system describe secret $(kubectl -n kube-system get secret | grep admin-user | awk '{print $1}')

# 将ClusterIP更改为NodePort（如果已经为NodePort忽略此步骤）：
kubectl edit svc kubernetes-dashboard -n kubernetes-dashboard

根据自己的实例端口号，通过任意安装了kube-proxy的宿主机的IP+端口即可访问到dashboard：

访问Dashboard：[​​https://192.168.100.156:31703/（请更改31703为自己的端口​​)，选择登录方式为令牌（即token方式）

13、命令补全

[root@k8s-master01 dashboard]# yum install bash-completion -y
[root@k8s-master01 dashboard]# source /usr/share/bash-completion/bash_completion
[root@k8s-master01 dashboard]# source <(kubectl completion bash)
[root@k8s-master01 dashboard]# echo "source <(kubectl completion bash)" >> ~/.bashrc