{
  "id": "nginx/limit-conn-zone-too-small",
  "signature": "nginx: [emerg] 1024 zones are not enough in \"limit_conn_zone\"",
  "signature_zh": "“limit_conn_zone”中的 1024 个区域不够",
  "regex": "\\d+ zones are not enough in \"limit_conn_zone\"",
  "domain": "nginx",
  "category": "resource_error",
  "subcategory": null,
  "root_cause": "The limit_conn_zone directive allocates a fixed number of slots (default 1024) for tracking connections per key, which is exhausted under high concurrency.",
  "root_cause_type": "generic",
  "root_cause_zh": "limit_conn_zone 指令为每个键分配了固定数量的插槽（默认 1024），在高并发下会耗尽。",
  "versions": [
    {
      "version": "nginx/1.18.0",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    },
    {
      "version": "nginx/1.20.0",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    },
    {
      "version": "nginx/1.24.0",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    },
    {
      "version": "nginx/1.26.0",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    }
  ],
  "os_specific": {},
  "dead_ends": [
    {
      "action": "",
      "why_fails": "limit_conn controls the maximum number of connections per key, not the number of zones/slots available for tracking.",
      "fail_rate": 0.8,
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "why_fails": "This eliminates the error but also removes the intended connection limiting functionality, potentially leading to resource exhaustion.",
      "fail_rate": 0.3,
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "why_fails": "Large zones consume significant memory; if the system runs out of memory, nginx may crash or fail to start.",
      "fail_rate": 0.5,
      "condition": "",
      "sources": []
    }
  ],
  "workarounds": [
    {
      "action": "Increase the zone size in the limit_conn_zone directive: `limit_conn_zone $binary_remote_addr zone=addr:10m;` (default is 1m, which holds ~1024 zones)",
      "success_rate": 0.9,
      "how": "Increase the zone size in the limit_conn_zone directive: `limit_conn_zone $binary_remote_addr zone=addr:10m;` (default is 1m, which holds ~1024 zones)",
      "condition": "",
      "sources": []
    },
    {
      "action": "If using multiple keys, create separate zones for each key to distribute the load: `limit_conn_zone $server_name zone=server:5m; limit_conn_zone $binary_remote_addr zone=addr:5m;`",
      "success_rate": 0.85,
      "how": "If using multiple keys, create separate zones for each key to distribute the load: `limit_conn_zone $server_name zone=server:5m; limit_conn_zone $binary_remote_addr zone=addr:5m;`",
      "condition": "",
      "sources": []
    },
    {
      "action": "Monitor zone usage with the status module and adjust dynamically: add `stub_status;` to a location and check active connections to estimate required zone size.",
      "success_rate": 0.75,
      "how": "Monitor zone usage with the status module and adjust dynamically: add `stub_status;` to a location and check active connections to estimate required zone size.",
      "condition": "",
      "sources": []
    }
  ],
  "workarounds_zh": [
    "增加 limit_conn_zone 指令中的区域大小：`limit_conn_zone $binary_remote_addr zone=addr:10m;`（默认是 1m，可容纳约 1024 个区域）",
    "如果使用多个键，为每个键创建单独的区域以分散负载：`limit_conn_zone $server_name zone=server:5m; limit_conn_zone $binary_remote_addr zone=addr:5m;`",
    "使用状态模块监控区域使用情况并动态调整：在 location 中添加 `stub_status;` 并检查活跃连接以估算所需的区域大小。"
  ],
  "transition_graph": {
    "leads_to": [],
    "preceded_by": [],
    "frequently_confused_with": []
  },
  "official_doc_url": "https://nginx.org/en/docs/http/ngx_http_limit_conn_module.html#limit_conn_zone",
  "official_doc_section": null,
  "error_code": null,
  "verification_tier": "ai_generated",
  "confidence": 0.85,
  "fix_success_rate": 0.9,
  "resolvable": "true",
  "first_seen": "2024-07-18",
  "last_confirmed": "2024-06-01",
  "last_updated": "2024-06-01",
  "evidence_count": 1,
  "tags": [],
  "locale": "en",
  "aliases": []
}