Rancher系列文章-Rancher v2.6使用脚本实现导入集群

概述

最近在玩 Rancher, 先从最基本的功能玩起, 目前有几个已经搭建好的 K8S 集群, 需要批量导入, 发现官网已经有批量导入的文档了. 根据 Rancher v2.6 进行验证微调后总结经验.

1. Rancher UI 获取创建集群参数

访问Rancher_URL/v3/clusters/，单击右上角“Create”，创建导入集群：
在参数填写页面中，修改以下参数:
- dockerRootDir 默认为/var/lib/docker,如果 dockerroot 路径有修改，需要修改此配置路径；
- enableClusterAlerting(可选) 根据需要选择是否默认开启集群告警；
- enableClusterMonitoring(可选) 根据需要选择是否默认开启集群监控；
- name(必填) 设置集群名称，名称具有唯一性，不能与现有集群名称相同；
配置好参数后单击Show Request；
在弹出的窗口中，复制API Request中HTTP Request:的{}中的内容，此内容即为创建的集群的 API 参数；

#!/bin/bash

api_url='https://rancher-demo.example.com'
api_token='token-dbkgj:7pqf5rrjmlxxxxxxxxxxxxxxxxxxxxxxxtrnfljwtxh'
cluster_name=$1

create_cluster_data()
{
  cat <<EOF
{
 "agentEnvVars": [ ],
 "aksConfig": null,
 "aliyunEngineConfig": null,
 "amazonElasticContainerServiceConfig": null,
 "answers": null,
 "azureKubernetesServiceConfig": null,
 "clusterTemplateRevisionId": "",
 "defaultClusterRoleForProjectMembers": "",
 "defaultPodSecurityPolicyTemplateId": "",
 "dockerRootDir": "/var/lib/docker",
 "eksConfig": null,
 "enableClusterAlerting": false,
 "enableClusterMonitoring": false,
 "gkeConfig": null,
 "googleKubernetesEngineConfig": null,
 "huaweiEngineConfig": null,
 "k3sConfig": null,
 "localClusterAuthEndpoint": null,
 "name": "$cluster_name",
 "rancherKubernetesEngineConfig": null,
 "rke2Config": null,
 "scheduledClusterScan": null,
 "windowsPreferedCluster": false
}
EOF
}

curl -k -X POST \
    -H "Authorization: Bearer ${api_token}" \
    -H "Content-Type: application/json" \
    -d "$(create_cluster_data)" $api_url/v3/clusters

2. 创建集群

保存以上代码为脚本文件，最后执行脚本。
```
./rancher_import_cluster.sh <your-cluster-name>
```
脚本执行完成后，集群状态如下所示，其状态为Provisioning;

3. 创建注册命令

这一步可能不需要, 创建集群时就会自动生成 clusterregistrationtokens

这里又生成了一遍, 会导致有多条 clusterregistrationtokens

4. 获取主机注册命令

复制并保存以下内容为脚本文件，修改前三行api_url、token、cluster_name，然后执行脚本。

#!/bin/bash

api_url='https://rancher-demo.example.com'
api_token='token-dbkgj:7pqf5rrjmlbgtssssssssssssssssssssssssssssnfljwtxh'
cluster_name=$1

cluster_ID=$( curl -s -k -H "Authorization: Bearer ${api_token}" $api_url/v3/clusters | jq -r ".data[] | select(.name == \"$cluster_name\") | .id" )

# nodeCommand
#curl -s -k -H "Authorization: Bearer ${api_token}" $api_url/v3/clusters/${cluster_ID}/clusterregistrationtokens | jq -r .data[].nodeCommand

# command
#curl -s -k -H "Authorization: Bearer ${api_token}" $api_url/v3/clusters/${cluster_ID}/clusterregistrationtokens | jq -r .data[].command

# insecureCommand
curl -s -k -H "Authorization: Bearer ${api_token}" $api_url/v3/clusters/${cluster_ID}/clusterregistrationtokens | jq -r .data[].insecureCommand

📝Notes:

这里看需要, 有 3 种命令:

nodeCommand: 直接通过 docker 来执行的;
command: 通过kubectl 来执行的;
insecureCommand: 私有 CA 证书, 通过 curl 结合 kubectl 来执行的.

这里我使用了第三种

AllInOne

#!/bin/bash

api_url='https://rancher-demo.example.com'
api_token='token-dbkgj:7pqf5rrjxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxljwtxh'
cluster_name=$1

create_cluster_data()
{
  cat <<EOF
{
 "agentEnvVars": [ ],
 "aksConfig": null,
 "aliyunEngineConfig": null,
 "amazonElasticContainerServiceConfig": null,
 "answers": null,
 "azureKubernetesServiceConfig": null,
 "clusterTemplateRevisionId": "",
 "defaultClusterRoleForProjectMembers": "",
 "defaultPodSecurityPolicyTemplateId": "",
 "dockerRootDir": "/var/lib/docker",
 "eksConfig": null,
 "enableClusterAlerting": false,
 "enableClusterMonitoring": false,
 "gkeConfig": null,
 "googleKubernetesEngineConfig": null,
 "huaweiEngineConfig": null,
 "k3sConfig": null,
 "localClusterAuthEndpoint": null,
 "name": "$cluster_name",
 "rancherKubernetesEngineConfig": null,
 "rke2Config": null,
 "scheduledClusterScan": null,
 "windowsPreferedCluster": false
}
EOF
}

curl -k -X POST \
    -H "Authorization: Bearer ${api_token}" \
    -H "Content-Type: application/json" \
    -d "$(create_cluster_data)" $api_url/v3/clusters >/dev/null

if [ $? -eq 0 ]; then
    cluster_ID=$( curl -s -k -H "Authorization: Bearer ${api_token}" $api_url/v3/clusters | jq -r ".data[] | select(.name == \"$cluster_name\") | .id" )
    # insecureCommand
    curl -s -k -H "Authorization: Bearer ${api_token}" $api_url/v3/clusters/${cluster_ID}/clusterregistrationtokens | jq -r .data[].insecureCommand
    echo "Please execute the above command in the imported cluster to complete the process."
else
    echo "Import cluster in rancher failed"
fi

./rancher_import_cluster.sh <your-cluster-name>

执行后会输出一条命令, 在被导入集群上执行如下命令:

# curl --insecure -sfL https://rancher-demo.example.com/v3/import/lzxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxqm6v4lp576c6mg_c-vwv5l.yaml | kubectl apply -f -
clusterrole.rbac.authorization.k8s.io/proxy-clusterrole-kubeapiserver created
clusterrolebinding.rbac.authorization.k8s.io/proxy-role-binding-kubernetes-master created
namespace/cattle-system created
serviceaccount/cattle created
clusterrolebinding.rbac.authorization.k8s.io/cattle-admin-binding created
secret/cattle-credentials-ec53bfa created
clusterrole.rbac.authorization.k8s.io/cattle-admin created
deployment.apps/cattle-cluster-agent created
service/cattle-cluster-agent created

即可导入成功.

🎉🎉🎉