{"record":{"id":"a7de3755b4a31d09","repo":"lionsoul2014/ip2region","slug":"failed-to-load-xdb-header-from-s","errorCode":null,"errorMessage":"failed to load xdb header from: %s","messagePattern":"failed to load xdb header from: (.+?)","errorType":"console","errorClass":null,"httpStatus":null,"severity":"critical","filePath":"binding/nginx/src/ngx_http_ip2region_module.c","lineNumber":121,"sourceCode":"        strcat(db_path, db_name);\n    }\n\n    ip2region_searcher = ngx_palloc(cf->pool, sizeof(ip2region_searcher_t));\n\n    if(ip2region_searcher == NULL) {\n        if(ngx_http_ip2region_is_absolute_path(db_name) != NGX_OK) {\n            free(db_path);\n        }\n        return NGX_CONF_ERROR;\n    }\n\n    ip2region_searcher->v_index = NULL;\n    ip2region_searcher->c_buffer = NULL;\n\n    // 检查XDB文件的版本信息以确定IP类型\n    xdb_header_t *header = xdb_load_header_from_file(db_path);\n    if (header == NULL) {\n        ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,\n                           \"failed to load xdb header from: %s\", db_path);\n        if(ngx_http_ip2region_is_absolute_path(db_name) != NGX_OK) {\n            free(db_path);\n        }\n        return NGX_CONF_ERROR;\n    }\n\n    xdb_version_t *xdb_version = xdb_version_from_header(header);\n    if (xdb_version == NULL) {\n        ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,\n                           \"failed to determine xdb version from header: %s\", db_path);\n        xdb_free_header((void *)header);\n        if(ngx_http_ip2region_is_absolute_path(db_name) != NGX_OK) {\n            free(db_path);\n        }\n        return NGX_CONF_ERROR;\n    }\n","sourceCodeStart":103,"sourceCodeEnd":139,"githubUrl":"https://github.com/lionsoul2014/ip2region/blob/c1a1fc7d5941760db3f8431dc05c48cf7f0e30a1/binding/nginx/src/ngx_http_ip2region_module.c#L103-L139","documentation":"After resolving db_path, the nginx module loads the xdb header via xdb_load_header_from_file to detect the IP version. A NULL return means the file could not be read or its header is invalid, so the module logs 'failed to load xdb header from: <path>' (plus the freed relative path handling) and rejects the config.","triggerScenarios":"db_path pointing to a missing, unreadable, empty, or corrupt/non-xdb file; permission denied for the nginx worker/master user; xdb_load_header_from_file failing on a truncated header.","commonSituations":"Wrong path in nginx.conf (file never deployed), xdb file deleted by a cleanup job, SELinux/AppArmor blocking read, file uploaded incompletely, ownership not readable by nginx user.","solutions":["Verify db_path exists and is readable by the nginx master user (ls -l / sudo -u nginx head -c256 file)","Correct the path in nginx.conf or deploy the xdb file to the configured location","Re-download/rebuild the xdb file if its header is corrupt (check size/checksum)","Check SELinux/AppArmor denial logs and grant read access to the file"],"exampleFix":"# before\nip2region_db /etc/nginx/region.xdb;   # file missing\n# after\n# deploy first: cp region.xdb /etc/nginx/region.xdb && chown nginx /etc/nginx/region.xdb\nip2region_db /etc/nginx/region.xdb;","handlingStrategy":"validation","validationCode":"# shell check before starting nginx\ntest -r /path/to/region.xdb && [ $(stat -c%s /path/to/region.xdb) -ge 256 ] || echo \"xdb missing or truncated\"","typeGuard":null,"tryCatchPattern":"/* module returns NGX_CONF_ERROR; verify config at deploy time */\nnginx -t || exit 1   # surfaces 'failed to load xdb header from: <path>' early","preventionTips":["Deploy and permission-check the xdb file before nginx reloads","Use absolute, stable paths managed by config management","Verify file size/checksum after every database update","Ensure nginx user can read the file (and SELinux/AppArmor allows it)","Run nginx -t in CI/deploy pipelines to fail before restart"],"tags":["c","nginx","file-not-found","xdb-header"],"backgroundTag":"xdb-file-not-found","analyzedSha":"c1a1fc7d5941760db3f8431dc05c48cf7f0e30a1","analyzedAt":"2026-09-02T16:58:39.988Z","contentChangedAt":null,"schemaVersion":2},"datasetVersion":"2026-09-09T21:17:11.164Z"}