{"record":{"id":"e25aa8ec8ef048d1","repo":"grpc/grpc-go","slug":"xds-failed-to-get-security-plugin-instance-v","errorCode":null,"errorMessage":"xds: failed to get security plugin instance (%+v): %v","messagePattern":"xds: failed to get security plugin instance \\(%\\+v\\): (.+?)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"internal/xds/balancer/clusterimpl/clusterimpl.go","lineNumber":323,"sourceCode":"\t\tb.loadWrapper.UpdateLoadStore(loadStore)\n\t}\n\n\treturn nil\n}\n\nfunc buildProviderFunc(configs map[string]*certprovider.BuildableConfig, instanceName, certName string, wantIdentity, wantRoot bool) (certprovider.Provider, error) {\n\tcfg := configs[instanceName]\n\tprovider, err := cfg.Build(certprovider.BuildOptions{\n\t\tCertName:     certName,\n\t\tWantIdentity: wantIdentity,\n\t\tWantRoot:     wantRoot,\n\t})\n\tif err != nil {\n\t\t// This error is not expected since the bootstrap process parses the\n\t\t// config and makes sure that it is acceptable to the plugin. Still, it\n\t\t// is possible that the plugin parses the config successfully, but its\n\t\t// Build() method errors out.\n\t\treturn nil, fmt.Errorf(\"xds: failed to get security plugin instance (%+v): %v\", cfg, err)\n\t}\n\treturn provider, nil\n}\n\nfunc (b *clusterImplBalancer) buildProviders(config *xdsresource.SecurityConfig) (certprovider.Provider, certprovider.Provider, error) {\n\tcpc := b.xdsClient.BootstrapConfig().CertProviderConfigs()\n\tvar rootProvider certprovider.Provider\n\tif config.UseSystemRootCerts {\n\t\trootProvider = systemRootCertsProvider{}\n\t} else {\n\t\trp, err := buildProvider(cpc, config.RootInstanceName, config.RootCertName, false, true)\n\t\tif err != nil {\n\t\t\treturn nil, nil, err\n\t\t}\n\t\trootProvider = rp\n\t}\n\n\tvar identityProvider certprovider.Provider","sourceCodeStart":305,"sourceCodeEnd":341,"githubUrl":"https://github.com/grpc/grpc-go/blob/03255a9237b6eb32710f6bc4f2de9a675b99fe36/internal/xds/balancer/clusterimpl/clusterimpl.go#L305-L341","documentation":"The cluster_impl balancer builds certificate provider plugins from the xDS bootstrap configuration's security settings. This error fires when a certificate provider's Build() method fails at runtime, even though the bootstrap config parsed successfully. The provider could be for identity certs (mTLS client), root certs (CA verification), or both.","triggerScenarios":"Triggered in buildProviderFunc() when cfg.Build() returns an error. The cfg is a certprovider.BuildableConfig looked up from b.xdsClient.BootstrapConfig().CertProviderConfigs() by instance name. Build() can fail if the referenced certificate file doesn't exist, the private key doesn't match the certificate, or the provider plugin has runtime initialization errors.","commonSituations":"The certificate file or key referenced in the xDS bootstrap config doesn't exist at runtime (wrong path, volume not mounted in Kubernetes); the TLS certificate and private key don't match; the certificate provider plugin (e.g., file-based, or a custom plugin) has a bug in its Build() method; the bootstrap config was generated with a different environment than where it runs.","solutions":["Verify the certificate and key files referenced in the xDS bootstrap config exist and are readable by the process","Check that the certificate and private key match (openssl x509 -noout -modulus | openssl md5 vs openssl rsa -noout -modulus | openssl md5)","Inspect the xDS bootstrap config's certificate_providers section for correct instance names, file paths, and plugin types","If running in Kubernetes, verify ConfigMaps/Secrets are mounted correctly at the expected paths","Check the wrapped error (the %v part) for the specific provider error message"],"exampleFix":"// before: bootstrap references non-existent cert files\n{\"certificate_providers\": {\"default\": {\"plugin_name\": \"file_watcher\", \"config\": {\"certificate_file\": \"/etc/certs/missing.crt\", \"private_key_file\": \"/etc/certs/server.key\"}}}}\n// after: correct file paths\n{\"certificate_providers\": {\"default\": {\"plugin_name\": \"file_watcher\", \"config\": {\"certificate_file\": \"/etc/certs/tls.crt\", \"private_key_file\": \"/etc/certs/tls.key\"}}}}","handlingStrategy":"validation","validationCode":"// Verify certificate files exist before starting with xDS security\nfunc validateCertFiles(bootstrapPath string) error {\n    data, err := os.ReadFile(bootstrapPath)\n    if err != nil { return err }\n    var cfg struct {\n        CertProviders map[string]struct {\n            PluginName string `json:\"plugin_name\"`\n            Config     struct {\n                CertFile     string `json:\"certificate_file\"`\n                PrivateKeyFile string `json:\"private_key_file\"`\n                RootFile     string `json:\"root_certificate_file\"`\n            } `json:\"config\"`\n        } `json:\"certificate_providers\"`\n    }\n    json.Unmarshal(data, &cfg)\n    for name, p := range cfg.CertProviders {\n        for _, f := range []string{p.Config.CertFile, p.Config.PrivateKeyFile, p.Config.RootFile} {\n            if f != \"\" {\n                if _, err := os.Stat(f); err != nil {\n                    return fmt.Errorf(\"provider %s: %s: %w\", name, f, err)\n                }\n            }\n        }\n    }\n    return nil\n}","typeGuard":null,"tryCatchPattern":"// Monitor channel connectivity after xDS security config updates\nif conn.GetState() == connectivity.TransientFailure {\n    // check logs for 'failed to get security plugin instance'\n    // verify cert files and bootstrap provider configs\n}","preventionTips":["Validate certificate file paths in the xDS bootstrap config before deployment","Ensure Kubernetes Secrets/ConfigMaps are mounted at correct paths","Verify certificate and key files match before starting the process","Test security config in staging with the same file layout as production"],"tags":["xds","clusterimpl","security","mtls","certificate","bootstrap"],"analyzedSha":"03255a9237b6eb32710f6bc4f2de9a675b99fe36","analyzedAt":"2026-08-07T00:29:34.215Z","schemaVersion":2},"datasetVersion":"2026-08-07T03:17:09.362Z"}