EC
EREMOTE
Linux / POSIXERRORNotableFilesystemHIGH confidence

Object Is Remote

Production Risk

Indicates nested or incorrectly configured NFS/distributed filesystem mounts.

What this means

EREMOTE (errno 66) is returned by NFS and certain distributed filesystem operations when an object exists on a remote host and the operation cannot be performed locally.

Why it happens
  1. 1Attempting to mount a remote path that is already a remote mount
  2. 2NFS operation on a path that resolves to a remote resource
How to reproduce

NFS mount of a path that is itself an NFS mount.

trigger — this will error
trigger — this will error
// Nesting NFS mounts across too many levels
mount("nfs_server:/path", "/mnt", "nfs", 0, opts);
// Returns -1, errno = EREMOTE if path is remote

expected output

mount: Object is remote (EREMOTE)

Fix

Mount the actual source directly

WHEN When NFS returns EREMOTE

Mount the actual source directly
# Find the actual export source
showmount -e nfs_server
# Mount the root export directly instead of a nested path

Why this works

Mount the NFS export source directly rather than a path that itself points to another NFS server.

Sources
Official documentation ↗

Linux Programmer Manual errno(3)

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