What is the default directory for NFS?

The default directory would be /var/nfs. Log files would be stored in /var/nfs/logs/nfslog*.

What is a Setgid directory?

SETGID stands for SET Group ID. Create a directory which permits the group to write, and set the group ID bit. Every files or directories created under it will have the same group ownership. Therefore, the whole group can share them.

What is NFS folder?

Network File Sharing (NFS) is a protocol that allows you to share directories and files with other Linux clients over a network. Shared directories are typically created on a file server, running the NFS server component. Users add files to them, which are then shared with other users who have access to the folder.

What is Setgid permission?

The Unix access rights flags setuid and setgid (short for “set user ID” and “set group ID”) allow users to run an executable with the file system permissions of the executable’s owner or group respectively and to change behaviour in directories.

Why is passwd setuid?

The passwd program is owned by the root account and marked as setuid, so the user is temporarily granted root access for that limited purpose.

What is S in chmod?

The chmod command is also capable of changing the additional permissions or special modes of a file or directory. The symbolic modes use ‘ s’ to represent the setuid and setgid modes, and ‘ t’ to represent the sticky mode.

What is Seteuid?

seteuid() sets the effective user ID of the calling process. Unprivileged processes may only set the effective user ID to the real user ID, the effective user ID or the saved set-user-ID.

What is setgid setuid & Stickybit?

Setuid, Setgid and Sticky Bits are special types of Unix/Linux file permission sets that permit certain users to run specific programs with elevated privileges. Ultimately the permissions that are set on a file determine what users can read, write or execute the file.

How does setgid affect both files and directories?

The setgid affects both files as well as directories. When used on a file, it executes with the privileges of the group of the user who owns it instead of executing with those of the group of the user who executed it.

How to export all directories in NFS server?

The -a flag will export all directories, the -r flag will reexport all directories and remove any old entries, while the -v flag provides verbosity and will output all of the NFS exports. Now that we have the NFS server configured with the basic NFS mount point of /root/nfs, we need to configure SetGID on this directory as shown below.

What are the restrictions for sticky bits in NFS?

Some UNIX-based Network File System (NFS) servers apply special interpretations or restrictions for the setuid, setgid, and sticky bits. Some versions of UNIX, for example, enforce mandatory locking on a directory with the setgid bit set but no execute permissions.

Where do I find NFS mount point files?

The NFS server mount points are configured with the /etc/exports file, this file lists the directories that are available to be accessed over NFS. Alternatively configuration files can also be created within the /etc/exports.d/ directory as long as they have the .exports extension. Below is an example NFS configuration within the /etc/exports file.