lvextend Extending Logical Volume Size non-disruptively - RHCSA





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How To Delete Standard Partitions in Linux - Tech Arkit



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Linux Disk Partitioning Creating Standard Partitions - RHCSA - Tech Arkit





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Special File Permissions Linux - SUID, SGID and Sticky Bit - Tech Arkit



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ACL - Access Control List - Linux Permissions - RHCSA

POSIX Access Control List ACL : To manage file security using  POSIX (Portable Operating System Interface) access control list ( ACL ).



ACLs allows to assign different permissions for different users and groups.  ACL allows fine-grained permissions to be allocated to a file. Users or groups as well as users and groups identified by a UID or GUID can be granted permissions.



The same permissions we can use below flags apply on files and directories.



Alpha Symbols 

r: Read

w: Write

x: Execute



Numeric symbols 

4 – Read

2 – Write

1 – Execute



- Permissions restricting access to a file to the file owner, membership of a single group or everyone.

- The file owner can set ACLs on individual files or directories.

- XFS file systems have built in ACL support.

- EXT4 file systems created on RHEL7 have ACL enabled by default.



POSIX Access Control List two types:



Access ACLs: we can use access ACLs to grant permissions for a particular file or directory.



Default ACLs: We can use default ACLs only on a directory but if  a file inside that directory does not have an ACL, it inherits the permissions of the default ACLs of the directory.



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Creating Linux Groups and Securing them with Password - RHCSA





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