Cheatsheet: Difference between revisions

* Inode is entry in inode table containing metadata about a regular file and directory.

* An inode is a data structure on a traditional Unix-style file system such as ext3 or ext4.

* Copy file: cp allocates a free inode number and placing a new entry in inode table.

* Move or Rename a file: if destination is same filesystem as the source, Has no impact on inode number, it only changes the time stamps in inode table.

* Delete a file: Deleting a file in Linux decrements the link count and freeing the inode number to be reused.

*Inode number (or index number) consists following attributes:

File types ( executable, block special etc )

Permissions ( read, write etc )

UID ( Owner )

GID ( Group )

FileSize

Time stamps including last access, last modification and last inode number change.

File deletion time

Number of links ( soft/hard )

Location of ile on harddisk.

Some other metadata about file.

*Check info:

df -i /dev/vda1 ==> Inodes on Filesystem

ls -il myfile.txt ==> Show inode no of file

find /home/rahul -inum 1150561 ==> Find file using inode no

* Free Inodes on Filesystem

In the case of inodes are full, You need to remove unused files from the filesystem to make Inode free.

There is no option to increase/decrease inodes on disk.

Its only created during the creation of filesystem on any disk.