{"record":{"id":"3178de6586c8ff7e","repo":"hashicorp/nomad","slug":"failed-to-create-staging-directory-for-volume-s","errorCode":null,"errorMessage":"failed to create staging directory for volume (%s): %v","messagePattern":"failed to create staging directory for volume \\((.+?)\\): (.+?)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"client/pluginmanager/csimanager/volume.go","lineNumber":441,"sourceCode":"\treturn filepath.Join(root, AllocSpecificDirName, allocID, volID)\n}\n\nfunc (v *volumeManager) targetForVolume(root string, volID, allocID string, usage *UsageOptions) string {\n\treturn filepath.Join(root, AllocSpecificDirName, allocID, volID, usage.ToFS())\n}\n\n// ensureStagingDir attempts to create a directory for use when staging a volume\n// and then validates that the path is not already a mount point for e.g an\n// existing volume stage.\n//\n// Returns whether the directory is a pre-existing mountpoint, the staging path,\n// and any errors that occurred.\nfunc (v *volumeManager) ensureStagingDir(vol *structs.CSIVolume, usage *UsageOptions) (string, bool, error) {\n\thostStagingPath := v.stagingDirForVolume(v.mountRoot, vol.Namespace, vol.ID, usage)\n\n\t// Make the staging path, owned by the Nomad User\n\tif err := os.MkdirAll(hostStagingPath, 0700); err != nil && !os.IsExist(err) {\n\t\treturn \"\", false, fmt.Errorf(\"failed to create staging directory for volume (%s): %v\", vol.ID, err)\n\n\t}\n\n\t// Validate that it is not already a mount point\n\tm := mount.New()\n\tisNotMount, err := m.IsNotAMountPoint(hostStagingPath)\n\tif err != nil {\n\t\treturn \"\", false, fmt.Errorf(\"mount point detection failed for volume (%s): %v\", vol.ID, err)\n\t}\n\n\treturn hostStagingPath, !isNotMount, nil\n}\n\n// ensureAllocDir attempts to create a directory for use when publishing a volume\n// and then validates that the path is not already a mount point (e.g when reattaching\n// to existing allocs).\n//\n// Returns whether the directory is a pre-existing mountpoint, the publish path,","sourceCodeStart":423,"sourceCodeEnd":459,"githubUrl":"https://github.com/hashicorp/nomad/blob/482b49bf1aec006f089bcfc7e632d8f6ac303e5e/client/pluginmanager/csimanager/volume.go#L423-L459","documentation":"ensureStagingDir in Nomad's CSI volume manager creates the host staging directory (mode 0700) for a volume before StageVolume. If os.MkdirAll fails with an error other than 'already exists', it fails staging with this message wrapping the OS error.","triggerScenarios":"os.MkdirAll(hostStagingPath, 0700) returns a non-IsExist error — e.g. a parent path component is a file, permission denied on the mount root, disk full, or read-only filesystem — during stageVolume.","commonSituations":"Incorrect -clienthost-volume-staging-directory (mount root) permissions; staging dir path replaced by a regular file; SELinux/AppArmor or container security policy blocking mkdir under /var/lib/nomad; disk full on the node.","solutions":["Check the host filesystem at the staging path: ensure parent directories exist, are writable by the Nomad user, and are directories not files","Fix permissions (chown/chmod) or relocate the staging dir to a valid path and restart the Nomad client","Free disk space or remount the filesystem read-write if the OS error indicates ENOSPC/EROFS","Inspect the wrapped %v OS error to identify the exact cause before retrying stageVolume"],"exampleFix":"// before (host)\nls -l /var/lib/nomad/client/csi\nstaging -> /some/regular/file\n// after (host)\nrm /var/lib/nomad/client/csi/staging\nmkdir -p /var/lib/nomad/client/csi/staging && chown nomad:nomad /var/lib/nomad/client/csi/staging","handlingStrategy":"validation","validationCode":"stagingPath := \"/var/lib/nomad/client/csi/staging\"\nfi, err := os.Stat(stagingPath)\nif err == nil && !fi.IsDir() { return fmt.Errorf(\"%s is not a directory\", stagingPath) }\nif err := os.MkdirAll(stagingPath, 0700); err != nil { return err }","typeGuard":null,"tryCatchPattern":"path, staged, err := vm.EnsureStagingDir(vol, usage)\nif err != nil {\n    return fmt.Errorf(\"staging dir setup failed: %w\", err) // inspect wrapped OS error\n}","preventionTips":["Verify the client volume staging/mount root is a writable directory owned by the Nomad user","Monitor node disk space (ENOSPC) and filesystem remount state","Check SELinux/AppArmor policies allow the Nomad user to create dirs under the data dir","After host restore/migration, validate data dir layout before starting the client"],"tags":["csi","nomad","filesystem","mkdir","staging"],"backgroundTag":"mkdir-permission-denied","analyzedSha":"482b49bf1aec006f089bcfc7e632d8f6ac303e5e","analyzedAt":"2026-09-04T07:54:14.808Z","contentChangedAt":"2026-09-04T07:54:14.808Z","schemaVersion":2},"datasetVersion":"2026-09-08T10:18:20.063Z"}