Google负载均衡器同域名两Backend Bucket流量50:50分配失败求助

你的配置失败主要有两个核心问题：

1. 资源引用字段错误：你在weightedBackendServices里用了backendService字段，但实际指向的是GCP Backend Bucket，应该改用backendBucket字段。
2. 资源路径格式错误：第二个JSON配置里用了完整的HTTP API URL（https://www.googleapis.com/...），但GCP要求使用项目内的相对资源路径（projects/${projectName}/global/backendBuckets/${backEndBucketName}）。

YAML格式（适用于负载均衡YAML编辑器） #

defaultService: projects/${projectName}/global/backendBuckets/${backEndBucket1Name}
name: ${my-lb-name}
hostRules:
- hosts:
  - ${my-hosting-domain-name}
  pathMatcher: matcher1
pathMatchers:
- defaultService: projects/${projectName}/global/backendBuckets/${backEndBucket1Name}
  name: matcher1
  routeRules:
  - matchRules:
    - prefixMatch: /
    priority: 1
    routeAction:
      weightedBackendServices:
      - backendBucket: projects/${projectName}/global/backendBuckets/${backEndBucket1Name}
        weight: 50
      - backendBucket: projects/${projectName}/global/backendBuckets/${backEndBucket2Name}
        weight: 50

JSON格式（适用于gcloud CLI） #

{
  "defaultService": "projects/${projectName}/global/backendBuckets/${backEndBucket1Name}",
  "fingerprint": "${myFingerPrint}",
  "hostRules": [
    {
      "hosts": [
        "${my-hosting-domain-name}"
      ],
      "pathMatcher": "matcher1"
    }
  ],
  "name": "${my-lb-name}",
  "pathMatchers": [
    {
      "defaultService": "projects/${projectName}/global/backendBuckets/${backEndBucket1Name}",
      "name": "matcher1",
      "routeRules": [
        {
          "matchRules": [
            {
              "prefixMatch": "/"
            }
          ],
          "priority": 1,
          "routeAction": {
            "weightedBackendServices": [
              {
                "backendBucket": "projects/${projectName}/global/backendBuckets/${backEndBucket1Name}",
                "weight": 50
              },
              {
                "backendBucket": "projects/${projectName}/global/backendBuckets/${backEndBucket2Name}",
                "weight": 50
              }
            ]
          }
        }
      ]
    }
  ]
}

• 确保两个Backend Bucket都已正确配置：开启静态网站托管，设置好主页面（比如index.html）和错误页面，并且Bucket的权限允许负载均衡服务账号访问（可以通过给Bucket添加roles/storage.objectViewer权限给service-${projectNumber}@gcp-sa-loadbalancing.iam.gserviceaccount.com）。
• 用gcloud CLI更新URL Map时，使用命令：

  gcloud compute url-maps update ${my-lb-name} --source urlmap.yaml
  

  或者如果是JSON格式：

  gcloud compute url-maps update ${my-lb-name} --source urlmap.json
  

• 配置完成后，等待负载均衡配置同步（通常需要几分钟），然后测试访问是否按50:50分配流量。

内容的提问来源于stack exchange，提问作者ipimfmw