关于运维:Rancher系列文章Rancher-v26使用脚本实现导入集群

概述

最近在玩 Rancher, 先从最根本的性能玩起, 目前有几个曾经搭建好的 K8S 集群, 须要批量导入, 发现官网曾经有批量导入的文档了. 依据 Rancher v2.6 进行验证微调后总结经验.

1. Rancher UI 获取创立集群参数

1. 拜访Rancher_URL/v3/clusters/，单击右上角“Create”，创立导入集群：

2. 在参数填写页面中，批改以下参数:

   • dockerRootDir 默认为/var/lib/docker, 如果 dockerroot 门路有批改，须要批改此配置门路；
   • enableClusterAlerting(可选) 依据须要抉择是否默认开启集群告警；
   • enableClusterMonitoring(可选) 依据须要抉择是否默认开启集群监控；
   • name(必填) 设置集群名称，名称具备唯一性，不能与现有集群名称雷同；
3. 配置好参数后单击Show Request；
4. 在弹出的窗口中，复制 API Request 中HTTP Request:的 {} 中的内容，此内容即为创立的集群的 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. 创立集群

1. 保留以上代码为脚本文件，最初执行脚本。

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

2. 脚本执行实现后，集群状态如下所示，其状态为Provisioning;

3. 创立注册命令

这一步可能不须要, 创立集群时就会主动生成 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

复制并保留以下内容为脚本文件，批改前三行api_url、token、cluster_name，而后执行脚本。

#!/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:

这里看须要, 有 3 种命令:

1. nodeCommand: 间接通过 docker 来执行的;
2. command: 通过kubectl 来执行的;
3. insecureCommand: 公有 CA 证书, 通过 curl 联合 kubectl 来执行的.

这里我应用了第三种

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>

执行后会输入一条命令, 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

即可导入胜利.

🎉🎉🎉

📝TODO:

前面再把登录到对应集群的 master 机器, 并执行命令纳入脚本.

系列文章

• Rancher 系列文章

📚️参考文档

• 应用脚本创立导入集群 | Rancher 文档

三人行, 必有我师; 常识共享, 天下为公. 本文由东风微鸣技术博客 EWhisper.cn 编写.