What is Nosuid in NFS?
nosuid — Disables set-user-identifier or set-group-identifier bits. This prevents remote users from gaining higher privileges by running a setuid program. port=num — Specifies the numeric value of the NFS server port. If num is 0 (the default), then mount queries the remote host’s portmapper for the port number to use.
What are 2 NFS mount options?
Common NFS mount options in Linux
- rw (read/write) / ro (read-only) – Use rw for data that users need to modify.
- suid / nosuid.
- hard / soft.
- intr / nointr.
- fg (foreground) / bg (background)
- devs / nodevs.
- timeo=n.
- retrans=n.
What NFS option allows?
An NFS server can grant superuser capabilities on a shared file system on a per-host basis. To grant these privileges, use the root= hostname option to the share command. You should use this option with care.
How can I improve my NFS performance?
Start plenty of NFS daemon threads.
- If read dominates, add RAM on the clients to cache more of the file systems and reduce read operations.
- If write dominates, make sure the clients are using noatime,nodiratime to avoid updating access times.
- If getattr dominates, tune the attribute caches.
What is No_all_squash?
no_all_squash: This is similar to no_root_squash option but applies to non-root users. Imagine, you have a shell as nobody user; checked /etc/exports file; no_all_squash option is present; check /etc/passwd file; emulate a non-root user; create a suid file as that user (by mounting using nfs).
What is Nolock in NFS?
The nolock option prevents the exchange of file lock information between the NFS server and this NFS client. Using the nolock option is required if the NFS server has its NFS file lock functionality in a broken or unimplemented state, but it works between any versions of NFS.
How mount NFS 3 Linux?
To mount using NFS version 3, use the nfs file system type and specify the nfsvers=3 mount option. To mount using NFS version 4, use either the nfs file system type, with the nfsvers=4 mount option, or the nfs4 file system type.
What is Rsize and Wsize in NFS?
rsize: The number of bytes NFS uses when reading files from an NFS server. wsize: The number of bytes NFS uses when writing files to an NFS server. The wsize is negotiated between the server and client to determine the largest block size that both can support.
What is NFS Root_squash?
root_squash prevents remote root users from having superuser (root) privileges on remote NFS-mounted volumes. no_root_squash allows root user on the NFS client host to access the NFS-mounted directory with the same rights and privileges that the superuser would normally have.
What port is NFS?
port 2049
NFS uses port 2049. NFSv3 and NFSv2 use the portmapper service on TCP or UDP port 111. The portmapper service is consulted to get the port numbers for services used with NFSv3 or NFSv2 protocols such as mountd, statd, and nlm.
How much RAM does NFS server need?
External NFS Server
| Category | Requirement |
|---|---|
| CPU cores | 4 |
| RAM | 4 GB |
| Hard disk | 300 GB |
Which is better SMB or NFS?
NFS offers better performance and is unbeatable if the files are medium-sized or small. For larger files, the timings of both methods are almost the same. In the case of sequential read, the performance of NFS and SMB are almost the same when using plain text. However, with encryption, NFS is better than SMB.