{"record":{"id":"2b899b602f57c50b","repo":"firecracker-microvm/firecracker","slug":"unable-to-open-or-read-from-the-mmds-content-file","errorCode":null,"errorMessage":"Unable to open or read from the mmds content file","messagePattern":"Unable to open or read from the mmds content file","errorType":"panic","errorClass":null,"httpStatus":null,"severity":"error","filePath":"src/firecracker/src/main.rs","lineNumber":395,"sourceCode":"        init_metrics(metrics_config).map_err(MainError::MetricsInitialization)?;\n    }\n\n    let mut seccomp_filters: BpfThreadMap = SeccompConfig::from_args(\n        arguments.flag_present(\"no-seccomp\"),\n        arguments.single_value(\"seccomp-filter\"),\n    )\n    .and_then(seccomp::get_filters)\n    .map_err(MainError::SeccompFilter)?;\n\n    let vmm_config_json = arguments\n        .single_value(\"config-file\")\n        .map(fs::read_to_string)\n        .map(|x| x.expect(\"Unable to open or read from the configuration file\"));\n\n    let metadata_json = arguments\n        .single_value(MMDS_CONTENT_ARG)\n        .map(fs::read_to_string)\n        .map(|x| x.expect(\"Unable to open or read from the mmds content file\"));\n\n    let boot_timer_enabled = arguments.flag_present(\"boot-timer\");\n    let pci_enabled = arguments.flag_present(\"enable-pci\");\n    let api_enabled = !arguments.flag_present(\"no-api\");\n    let api_payload_limit = arg_parser\n        .arguments()\n        .single_value(\"http-api-max-payload-size\")\n        .map(|lim| {\n            lim.parse::<usize>()\n                .expect(\"'http-api-max-payload-size' parameter expected to be of 'usize' type.\")\n        })\n        // Safe to unwrap as we provide a default value.\n        .unwrap();\n\n    // If the mmds size limit is not explicitly configured, default to using the\n    // `http-api-max-payload-size` value.\n    let mmds_size_limit = arg_parser\n        .arguments()","sourceCodeStart":377,"sourceCodeEnd":413,"githubUrl":"https://github.com/firecracker-microvm/firecracker/blob/0a745def42ddf4cc2a744d79a08a27ff50b5d27a/src/firecracker/src/main.rs#L377-L413","documentation":"Error \"Unable to open or read from the mmds content file\" thrown in firecracker-microvm/firecracker.","triggerScenarios":"Thrown at src/firecracker/src/main.rs:395 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Verify the MMDS content file path exists and is readable.","Check the file contents are valid JSON before passing it via --mmds-content-file."],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"0a745def42ddf4cc2a744d79a08a27ff50b5d27a","analyzedAt":"2026-08-19T05:27:02.517Z","contentChangedAt":"2026-08-19T05:27:02.517Z","schemaVersion":2},"datasetVersion":"2026-09-14T05:17:10.506Z"}