k8s kubeadm单机器安装

最后编辑时间：2024/3/26

单节点配置

检查是否已经安装kubectl, kubelet, kubeadm直接输入命令确定，如果提示没有该指令则正确
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```
kubectl
kubelet
kubeadm
```
如果安装，使用apt remove和snap remove删除
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```
sudo apt remove kubectl kubelet kubeadm
sudo snap remove kubectl kubelet kubeadm
```
关闭防火墙

查看防火墙状态 inactive说明是未激活
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```
sudo ufw status
```
开机不启动防火墙，重启即可生效
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```
sudo ufw disable
```

确保docker已经安装，并正确配置cgroup管理器，例如

配置docker

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sudo mkdir -p /etc/docker
sudo vi /etc/docker/daemon.json

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#{
#  "registry-mirrors": ["https://2m9jza5s.mirror.aliyuncs.com"],
#  "insecure-registries": ["localhost:32000"],
#  "exec-opts": [ "native.cgroupdriver=systemd" ],
#  "data-root": "/data/wzh/docker/image",
#  "default-runtime": "nvidia",
#    "runtimes": {
#        "nvidia": {
#            "path": "/usr/bin/nvidia-container-runtime",
#            "runtimeArgs": []
#        }
#    }
#}
{
  "registry-mirrors": ["https://2m9jza5s.mirror.aliyuncs.com"],  # 必要
  "insecure-registries": ["localhost:32000"],  
  "exec-opts": [ "native.cgroupdriver=systemd" ],  # 必要
  "data-root": "/data/wzh/docker/image",  # 配置镜像目录
}

"https://???.mirror.aliyuncs.com"配成自己的，见链接。

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systemctl restart docker
systemctl restart kubelet

安装kubectl, kubelet, kubeadm

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# 检查这个kubernetes-cni
sudo apt install -y kubelet=1.22.7-00 kubectl=1.22.7-00 kubeadm=1.22.7-00
# apt list kubernetes-cni -a，可以查找有什么版本
# sudo journalctl -u kubelet # 查看kubelet状态
# systemctl status kubelet # 查看kubelet状态

禁用swap

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vim /etc/default/kubelet
# 添加下面这行
KUBELET_EXTRA_ARGS="--fail-swap-on=false"
systemctl daemon-reload && systemctl restart kubelet

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vi /etc/fstab

注释掉带 /swap.img的那行

kubeadm版本不应该超过1.25.0，因为1.25.0之后k8s使用了containerd，因此注意以后不要使用apt upgrade，否则上面需要重新来一遍。
出错后首先重置：
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```
sudo kubeadm reset
```

init

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sudo kubeadm init --kubernetes-version=v1.22.7 --image-repository registry.aliyuncs.com/google_containers --pod-network-cidr=10.24.0.0/16 --ignore-preflight-errors=Swap --apiserver-advertise-address=0.0.0.0

init成功后，提示如下，表示成功了，如果卡住了，去查上述步骤有没有跟着做：

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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 10.181.8.94:6443 --token 0desqq.a4oq0rwqyursqah9 \
        --discovery-token-ca-cert-hash sha256:7e181cd0f0a435adf7746b17b09b10dba5c9d83936e92fffdc1e67cbf4a9cc06

配置登录选项

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

init成功后，检查kubectl

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 $ kubectl get pod -A

此时仍有两个没有打开

需要配置网络

创建文件flannel.yaml，内容如下，

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---
kind: Namespace
apiVersion: v1
metadata:
  name: kube-flannel
  labels:
    k8s-app: flannel
    pod-security.kubernetes.io/enforce: privileged
---
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  labels:
    k8s-app: flannel
  name: flannel
rules:
- apiGroups:
  - ""
  resources:
  - pods
  verbs:
  - get
- apiGroups:
  - ""
  resources:
  - nodes
  verbs:
  - get
  - list
  - watch
- apiGroups:
  - ""
  resources:
  - nodes/status
  verbs:
  - patch
- apiGroups:
  - networking.k8s.io
  resources:
  - clustercidrs
  verbs:
  - list
  - watch
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  labels:
    k8s-app: flannel
  name: flannel
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: flannel
subjects:
- kind: ServiceAccount
  name: flannel
  namespace: kube-flannel
---
apiVersion: v1
kind: ServiceAccount
metadata:
  labels:
    k8s-app: flannel
  name: flannel
  namespace: kube-flannel
---
kind: ConfigMap
apiVersion: v1
metadata:
  name: kube-flannel-cfg
  namespace: kube-flannel
  labels:
    tier: node
    k8s-app: flannel
    app: flannel
data:
  cni-conf.json: |
    {
      "name": "cbr0",
      "cniVersion": "0.3.1",
      "plugins": [
        {
          "type": "flannel",
          "delegate": {
            "hairpinMode": true,
            "isDefaultGateway": true
          }
        },
        {
          "type": "portmap",
          "capabilities": {
            "portMappings": true
          }
        }
      ]
    }
  net-conf.json: |
    {
      "Network": "10.244.0.0/16",
      "Backend": {
        "Type": "vxlan"
      }
    }
---
apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: kube-flannel-ds
  namespace: kube-flannel
  labels:
    tier: node
    app: flannel
    k8s-app: flannel
spec:
  selector:
    matchLabels:
      app: flannel
  template:
    metadata:
      labels:
        tier: node
        app: flannel
    spec:
      affinity:
        nodeAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            nodeSelectorTerms:
            - matchExpressions:
              - key: kubernetes.io/os
                operator: In
                values:
                - linux
      hostNetwork: true
      priorityClassName: system-node-critical
      tolerations:
      - operator: Exists
        effect: NoSchedule
      serviceAccountName: flannel
      initContainers:
      - name: install-cni-plugin
        image: rancher/mirrored-flannelcni-flannel-cni-plugin:v1.0.0
       #image: docker.io/rancher/mirrored-flannelcni-flannel-cni-plugin:v1.1.2
        command:
        - cp
        args:
        - -f
        - /flannel
        - /opt/cni/bin/flannel
        volumeMounts:
        - name: cni-plugin
          mountPath: /opt/cni/bin
      - name: install-cni
        image: lizhenliang/flannel:v0.11.0-amd64
       #image: docker.io/rancher/mirrored-flannelcni-flannel:v0.21.5
        command:
        - cp
        args:
        - -f
        - /etc/kube-flannel/cni-conf.json
        - /etc/cni/net.d/10-flannel.conflist
        volumeMounts:
        - name: cni
          mountPath: /etc/cni/net.d
        - name: flannel-cfg
          mountPath: /etc/kube-flannel/
      containers:
      - name: kube-flannel
        image: lizhenliang/flannel:v0.11.0-amd64
       #image: docker.io/rancher/mirrored-flannelcni-flannel:v0.21.5
        command:
        - /opt/bin/flanneld
        args:
        - --ip-masq
        - --kube-subnet-mgr
        resources:
          requests:
            cpu: "100m"
            memory: "50Mi"
        securityContext:
          privileged: false
          capabilities:
            add: ["NET_ADMIN", "NET_RAW"]
        env:
        - name: POD_NAME
          valueFrom:
            fieldRef:
              fieldPath: metadata.name
        - name: POD_NAMESPACE
          valueFrom:
            fieldRef:
              fieldPath: metadata.namespace
        - name: EVENT_QUEUE_DEPTH
          value: "5000"
        volumeMounts:
        - name: run
          mountPath: /run/flannel
        - name: flannel-cfg
          mountPath: /etc/kube-flannel/
        - name: xtables-lock
          mountPath: /run/xtables.lock
      volumes:
      - name: run
        hostPath:
          path: /run/flannel
      - name: cni-plugin
        hostPath:
          path: /opt/cni/bin
      - name: cni
        hostPath:
          path: /etc/cni/net.d
      - name: flannel-cfg
        configMap:
          name: kube-flannel-cfg
      - name: xtables-lock
        hostPath:
          path: /run/xtables.lock
          type: FileOrCreate

创建完成后执行kubectl apply -f flannel.yaml，执行很快，但是需要等待一会才会启动，一会会出现

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wzh@chen:~$ kubectl get pod -A
NAMESPACE      NAME                           READY   STATUS    RESTARTS   AGE
kube-flannel   kube-flannel-ds-xqpqb          1/1     Running   0          11h
kube-system    coredns-7f6cbbb7b8-w5lp8       1/1     Running   0          12h
kube-system    coredns-7f6cbbb7b8-xmps6       1/1     Running   0          12h
kube-system    etcd-chen                      1/1     Running   0          12h
kube-system    kube-apiserver-chen            1/1     Running   0          12h
kube-system    kube-controller-manager-chen   1/1     Running   0          12h
kube-system    kube-proxy-c5tks               1/1     Running   0          12h
kube-system    kube-scheduler-chen            1/1     Running   0          12h
wzh@chen:~$ kubectl get nodes
NAME   STATUS   ROLES                  AGE   VERSION
chen   Ready    control-plane,master   13h   v1.22.7

现在master可以在去除所有污点后执行(":..." -> "-" )，以下未去除污点操作，可以使用kubectl describe进行查看是否有污点：

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$ kubectl taint nodes --all node-role.kubernetes.io/master-
$ kubectl taint nodes --all foo-