了解如何使用sealos生成和应用Clusterfile，自定义配置Kubernetes集群，实现高效的集群管理。

运行 sealos gen 生成一个 Clusterfile，例如：

$ sealos gen labring/kubernetes:v1.25.0 labring/helm:v3.8.2 labring/calico:v3.24.1 \
   --masters 192.168.0.2,192.168.0.3,192.168.0.4 \
   --nodes 192.168.0.5,192.168.0.6,192.168.0.7 --passwd 'xxx' -o Clusterfile

注意：labring/helm 应当在 labring/calico 之前。

生成的 Clusterfile 如下：

Clusterfile

apiVersion: apps.sealos.io/v1beta1
kind: Cluster
metadata:
  creationTimestamp: null
  name: default
spec:
  hosts:
  - ips:
    - 192.168.0.2:22
    - 192.168.0.3:22
    - 192.168.0.4:22
    roles:
    - master
    - amd64
  - ips:
    - 192.168.0.5:22
    - 192.168.0.6:22
    - 192.168.0.7:22
    roles:
    - node
    - amd64
  image:
  - labring/kubernetes:v1.24.0
  - labring/helm:v3.8.2
  - labring/calico:v3.24.1
  ssh:
    passwd: xxx
    pk: /root/.ssh/id_rsa
    port: 22
    user: root
status: {}

生成 Clusterfile 后，然后更新集群配置。例如，要修改 pods 的 CIDR 范围，就可以修改 networking.podSubnet 和 spec.data.spec.calicoNetwork.ipPools.cidr 字段。最终的 Clusterfile 会像是这样：

Clusterfile

apiVersion: apps.sealos.io/v1beta1
kind: Cluster
metadata:
  creationTimestamp: null
  name: default
spec:
  hosts:
    - ips:
        - 192.168.0.2:22
        - 192.168.0.3:22
        - 192.168.0.4:22
      roles:
        - master
        - amd64
    - ips:
        - 192.168.0.5:22
        - 192.168.0.6:22
        - 192.168.0.7:22
      roles:
        - node
        - amd64
  image:
    - labring/kubernetes:v1.25.0
    - labring/helm:v3.8.2
    - labring/calico:v3.24.1
  ssh:
    passwd: xxx
    pk: /root/.ssh/id_rsa
    port: 22
    user: root
status: {}
---
apiVersion: kubeadm.k8s.io/v1beta2
kind: ClusterConfiguration
networking:
  podSubnet: 10.160.0.0/12
---
apiVersion: apps.sealos.io/v1beta1
kind: Config
metadata:
  name: calico
spec:
  path: charts/calico.values.yaml
  strategy: merge
  data: |
    installation:
      enabled: true
      kubernetesProvider: ""
      calicoNetwork:
        ipPools:
        - blockSize: 26
          cidr: 10.160.0.0/12
          encapsulation: IPIP
          natOutgoing: Enabled
          nodeSelector: all()
        nodeAddressAutodetectionV4:
          interface: "eth.*|en.*"

运行 sealos apply -f Clusterfile 启动集群。集群运行成功后会把 Clusterfile 保存到 .sealos/default/Clusterfile 文件中，可以修改其中字段来重新 apply 对集群进行变更。

注意：

可以参考官方文档或运行 kubeadm config print init-defaults 命令来打印 kubeadm 配置。

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