centos7.9安装k8s集群v1.28.x版本

作者: 我才不是大神 | 来源:发表于2023-09-14 15:48 被阅读0次

一、系统情况

虚拟机版本：pve
系统版本：centos7.9_2009_x86
镜像地址：http://isoredirect.centos.org/centos/7/isos/x86_64/
配置：4核8G（官网最低要求2核2G）

主机	说明
192.168.1.32	master节点
192.168.1.33	node1节点
192.168.1.34	node2节点

二、环境配置

编辑器安装：因为习惯，我使用nano作为编辑器，也可以根据喜好使用vi或vim。

yum install -y nano #安装nano

2.1、所有节点修改防火墙

本次是实验环境，图省事选择关闭防火墙，如果是生产，除非做了公网和内网隔离，还是别关闭吧，做好相关接口开发就行。

systemctl stop firewalld  #停止防火墙
systemctl disable firewalld #设置开机不启动

2.2、所有节点禁用selinux

#修改/etc/selinux/config文件中的SELINUX=permissive
nano /etc/selinux/config
或
# 将 SELinux 设置为 permissive 模式（相当于将其禁用）
sudo setenforce 0
sudo sed -i 's/^SELINUX=enforcing$/SELINUX=permissive/' /etc/selinux/config

禁用selinux

2.3、所有节点关闭swap分区

#永久禁用swap,删除或注释掉/etc/fstab里的swap设备的挂载命令即可
nano /etc/fstab
#/dev/mapper/centos-swap swap                    swap    defaults        0 0

关闭swap分区

修改后重启服务器

reboot

2.4、所有节点时间同步

yum -y install ntp
systemctl start ntpd
systemctl enable ntpd

2.5、开启bridge-nf-call-iptalbes

执行下述指令

cat <<EOF | sudo tee /etc/modules-load.d/k8s.conf
overlay
br_netfilter
EOF

sudo modprobe overlay
sudo modprobe br_netfilter

# 设置所需的 sysctl 参数，参数在重新启动后保持不变
cat <<EOF | sudo tee /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-iptables  = 1
net.bridge.bridge-nf-call-ip6tables = 1
net.ipv4.ip_forward                 = 1
EOF

# 应用 sysctl 参数而不重新启动
sudo sysctl --system

通过运行以下指令确认 `br_netfilter` 和 `overlay` 模块被加载：

lsmod | grep br_netfilter
lsmod | grep overlay

通过运行以下指令确认 net.bridge.bridge-nf-call-iptables、net.bridge.bridge-nf-call-ip6tables 和 net.ipv4.ip_forward 系统变量在你的 sysctl 配置中被设置为 1：

sysctl net.bridge.bridge-nf-call-iptables net.bridge.bridge-nf-call-ip6tables net.ipv4.ip_forward

三、所有节点安装containerd

3.1、安装containerd

yum install -y yum-utils
yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
yum -y install containerd.io

3.2、生成config.toml配置

containerd config default > /etc/containerd/config.toml

3.3、配置 systemd cgroup 驱动

在 /etc/containerd/config.toml 中设置

sed -i 's/SystemdCgroup = false/SystemdCgroup = true/g' /etc/containerd/config.toml

[plugins."io.containerd.grpc.v1.cri".containerd.runtimes.runc]
  ...
  [plugins."io.containerd.grpc.v1.cri".containerd.runtimes.runc.options]
    SystemdCgroup = true

将sandbox_image下载地址改为阿里云地址

  [plugins."io.containerd.grpc.v1.cri"]
    ...
    sandbox_image = "registry.aliyuncs.com/google_containers/pause:3.9"

3.4、启动containerd 并设置开机自启动

systemctl restart containerd && systemctl enable containerd

四、k8s配置阿里云yum源

cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name = Kubernetes
baseurl = https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
enabled = 1
gpgcheck = 0
repo_gpgcheck = 0
gpgkey = https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF

五、yum安装kubeadm、kubelet、kubectl

在所有服务器上都安装kubeadm、kubelet、kubectl

5.1、删除历史版本

如果之前没装过就跳过此步骤

yum -y remove kubelet kubeadm kubectl

5.2、安装kubeadm、kubelet、kubectl

这些说明适用于 Kubernetes 1.28，阿里的yum源，kubelet版本只更新到1.28.0版本，所以下面命令需要加上版本号。

yum install -y kubelet-1.28.0 kubeadm-1.28.0 kubectl-1.28.0 --disableexcludes=kubernetes
systemctl enable kubelet

六、初始化master节点

kubeadm init \
--apiserver-advertise-address=192.168.1.32 \
--image-repository registry.aliyuncs.com/google_containers \
--kubernetes-version v1.28.0 \
--service-cidr=10.96.0.0/12 \
--pod-network-cidr=10.244.0.0/16 \

得到以下内容，就为成功

Your Kubernetes control-plane has initialized successfully!

To start using your cluster, you need to run the following as a regular user:

  mkdir -p $HOME/.kube
  sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
  sudo chown $(id -u):$(id -g) $HOME/.kube/config

Alternatively, if you are the root user, you can run:

  export KUBECONFIG=/etc/kubernetes/admin.conf

You should now deploy a pod network to the cluster.
Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at:
  https://kubernetes.io/docs/concepts/cluster-administration/addons/

Then you can join any number of worker nodes by running the following on each as root:

kubeadm join 192.168.1.32:6443 --token ew2io9.4iw5iw110z880t7f \
        --discovery-token-ca-cert-hash sha256:4d7754e0b61037862d8a6c7f07f6467d7c263e7443c38f1f7b57c1eb739d2fe7

然后按照上面提示，一步步执行命令

mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
export KUBECONFIG=/etc/kubernetes/admin.conf

现在可以看到master节点了

kubectl get node

主节点

七、子节点加入master节点

kubeadm join 192.168.1.31:6443 --token bhtq9s.dr8txafrpnncpfj8         --discovery-token-ca-cert-hash sha256:875a3dad7491c653ab7cabcbd1e80cbcc2e91a42263bb09e9703d39cdc490b3c

加入master节点

这里面经常遇到的情况是命令卡住不动，大概率是token过期了，回到master节点，执行

kubeadm token create

创建新的token，替换后重新执行就行
现在可以看到master节点和子节点了

kubectl get node

节点信息

8、部署CNI网络

虽然现在有了master和node节点，但是所有节点状态都是NotReady，这是因为没有cni网络插件。

8.1、下载cni插件

wget https://github.com/containernetworking/plugins/releases/download/v1.3.0/cni-plugins-linux-amd64-v1.3.0.tgz
mkdir -pv /opt/cni/bin
tar zxvf cni-plugins-linux-amd64-v1.3.0.tgz -C /opt/cni/bin/

8.2、master安装flannel

kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml

master安装flannel成功

这时候再看节点状态

节点状态

都已经成为ready了，在master服务器执行

kubectl get pods -n kube-system

查看pod状态，如果是

pod状态

说明可用了。

九、安装dashboard

9.1、下载recommended.yaml文件

kubectl apply -f https://raw.githubusercontent.com/kubernetes/dashboard/v2.7.0/aio/deploy/recommended.yaml

由于外网比较慢，这儿提供我目前用的，和原版唯一不同的，就是以下内容，目的是为了暴露端口，外网直接访问。

spec:
  ports:
    - port: 443
      targetPort: 8443
      name: https  # 原版没有name
      nodePort: 32001 # 原版没有nodePort
   type: NodePort # 原版没有nodePort

kubectl apply -f [你的本地路径]/recommended.yaml

apiVersion: v1
kind: Namespace
metadata:
  name: kubernetes-dashboard

---

apiVersion: v1
kind: ServiceAccount
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kubernetes-dashboard

---

kind: Service
apiVersion: v1
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kubernetes-dashboard
spec:
  ports:
    - port: 443
      targetPort: 8443
      name: https
      nodePort: 32001
  type: NodePort
  selector:
    k8s-app: kubernetes-dashboard

---

apiVersion: v1
kind: Secret
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard-certs
  namespace: kubernetes-dashboard
type: Opaque

---

apiVersion: v1
kind: Secret
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard-csrf
  namespace: kubernetes-dashboard
type: Opaque
data:
  csrf: ""

---

apiVersion: v1
kind: Secret
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard-key-holder
  namespace: kubernetes-dashboard
type: Opaque

---

kind: ConfigMap
apiVersion: v1
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard-settings
  namespace: kubernetes-dashboard

---

kind: Role
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kubernetes-dashboard
rules:
  # Allow Dashboard to get, update and delete Dashboard exclusive secrets.
  - apiGroups: [""]
    resources: ["secrets"]
    resourceNames: ["kubernetes-dashboard-key-holder", "kubernetes-dashboard-certs", "kubernetes-dashboard-csrf"]
    verbs: ["get", "update", "delete"]
    # Allow Dashboard to get and update 'kubernetes-dashboard-settings' config map.
  - apiGroups: [""]
    resources: ["configmaps"]
    resourceNames: ["kubernetes-dashboard-settings"]
    verbs: ["get", "update"]
    # Allow Dashboard to get metrics.
  - apiGroups: [""]
    resources: ["services"]
    resourceNames: ["heapster", "dashboard-metrics-scraper"]
    verbs: ["proxy"]
  - apiGroups: [""]
    resources: ["services/proxy"]
    resourceNames: ["heapster", "http:heapster:", "https:heapster:", "dashboard-metrics-scraper", "http:dashboard-metrics-scraper"]
    verbs: ["get"]

---

kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
rules:
  # Allow Metrics Scraper to get metrics from the Metrics server
  - apiGroups: ["metrics.k8s.io"]
    resources: ["pods", "nodes"]
    verbs: ["get", "list", "watch"]

---

apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kubernetes-dashboard
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: Role
  name: kubernetes-dashboard
subjects:
  - kind: ServiceAccount
    name: kubernetes-dashboard
    namespace: kubernetes-dashboard

---

apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: kubernetes-dashboard
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: kubernetes-dashboard
subjects:
  - kind: ServiceAccount
    name: kubernetes-dashboard
    namespace: kubernetes-dashboard

---

kind: Deployment
apiVersion: apps/v1
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kubernetes-dashboard
spec:
  replicas: 1
  revisionHistoryLimit: 10
  selector:
    matchLabels:
      k8s-app: kubernetes-dashboard
  template:
    metadata:
      labels:
        k8s-app: kubernetes-dashboard
    spec:
      securityContext:
        seccompProfile:
          type: RuntimeDefault
      containers:
        - name: kubernetes-dashboard
          image: kubernetesui/dashboard:v2.7.0
          imagePullPolicy: Always
          ports:
            - containerPort: 8443
              protocol: TCP
          args:
            - --auto-generate-certificates
            - --namespace=kubernetes-dashboard
            # Uncomment the following line to manually specify Kubernetes API server Host
            # If not specified, Dashboard will attempt to auto discover the API server and connect
            # to it. Uncomment only if the default does not work.
            # - --apiserver-host=http://my-address:port
          volumeMounts:
            - name: kubernetes-dashboard-certs
              mountPath: /certs
              # Create on-disk volume to store exec logs
            - mountPath: /tmp
              name: tmp-volume
          livenessProbe:
            httpGet:
              scheme: HTTPS
              path: /
              port: 8443
            initialDelaySeconds: 30
            timeoutSeconds: 30
          securityContext:
            allowPrivilegeEscalation: false
            readOnlyRootFilesystem: true
            runAsUser: 1001
            runAsGroup: 2001
      volumes:
        - name: kubernetes-dashboard-certs
          secret:
            secretName: kubernetes-dashboard-certs
        - name: tmp-volume
          emptyDir: {}
      serviceAccountName: kubernetes-dashboard
      nodeSelector:
        "kubernetes.io/os": linux
      # Comment the following tolerations if Dashboard must not be deployed on master
      tolerations:
        - key: node-role.kubernetes.io/master
          effect: NoSchedule

---

kind: Service
apiVersion: v1
metadata:
  labels:
    k8s-app: dashboard-metrics-scraper
  name: dashboard-metrics-scraper
  namespace: kubernetes-dashboard
spec:
  ports:
    - port: 8000
      targetPort: 8000
  selector:
    k8s-app: dashboard-metrics-scraper

---

kind: Deployment
apiVersion: apps/v1
metadata:
  labels:
    k8s-app: dashboard-metrics-scraper
  name: dashboard-metrics-scraper
  namespace: kubernetes-dashboard
spec:
  replicas: 1
  revisionHistoryLimit: 10
  selector:
    matchLabels:
      k8s-app: dashboard-metrics-scraper
  template:
    metadata:
      labels:
        k8s-app: dashboard-metrics-scraper
    spec:
      securityContext:
        seccompProfile:
          type: RuntimeDefault
      containers:
        - name: dashboard-metrics-scraper
          image: kubernetesui/metrics-scraper:v1.0.8
          ports:
            - containerPort: 8000
              protocol: TCP
          livenessProbe:
            httpGet:
              scheme: HTTP
              path: /
              port: 8000
            initialDelaySeconds: 30
            timeoutSeconds: 30
          volumeMounts:
          - mountPath: /tmp
            name: tmp-volume
          securityContext:
            allowPrivilegeEscalation: false
            readOnlyRootFilesystem: true
            runAsUser: 1001
            runAsGroup: 2001
      serviceAccountName: kubernetes-dashboard
      nodeSelector:
        "kubernetes.io/os": linux
      # Comment the following tolerations if Dashboard must not be deployed on master
      tolerations:
        - key: node-role.kubernetes.io/master
          effect: NoSchedule
      volumes:
        - name: tmp-volume
          emptyDir: {}

9.2、创建用户示例

本地创建dashboard-adminuser.yaml

apiVersion: v1
kind: ServiceAccount
metadata:
  name: admin-user
  namespace: kubernetes-dashboard
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: admin-user
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: cluster-admin
subjects:
- kind: ServiceAccount
  name: admin-user
  namespace: kubernetes-dashboard

kubectl apply -f [你的文件路径]/dashboard-adminuser.yaml
kubectl -n kubernetes-dashboard create token admin-user

token

输入token

首页

至此，安装完成！