This is the standard way to encrypt disks on Linux.
The LUKS version 2 (LUKS2) format replaces the legacy LUKS (LUKS1) format.
The dm-crypt subsystem and the cryptsetup tool now uses LUKS2 as the default format for encrypted volumes.
LUKS2 provides many improvements and features, for example, it extends the capabilities of the on-disk format and provides flexible ways of storing metadata.
The RHEL 8 installer now supports the LUKS2 disk encryption format.
It uses this format by default but you can select a LUKS version from Anaconda’s Custom Partitioning window or by using the new options in Kickstart’s autopart, logvol, part, and RAID commands.
XFS is the default file system since RHEL 7.
Support for shared copy-on-write data extents
This feature enables two or more files to share a common set of data blocks.
It is fast: creating shared copies does not utilize disk I/O.
It is space-efficient: shared blocks do not consume additional disk space.
It is transparent: files sharing common blocks act like regular files.
This allows efficient file cloning and per-file snapshots.
This feature is enabled by default when creating an XFS filesystem.
RHEL 7 servers can mount XFS file systems with shared copy-on-write data extends only in read-only mode.
To create an XFS file system without this feature:
# mkfs.xfs -m reflink=0 block-device
Increase of maximum XFS file system size
The maximum supported size of an XFS file system has been increased from 500 TiB to 1024 TiB.
ext4 file system now supports metadata checksum
This enables the file system to recognize the corrupt metadata, which avoids damage and increases the file system resilience.
Installing and booting from
NVDIMM devices is now supported
Kernel improvements to support NVDIMM devices provide improved system performance capabilities and enhanced file system access for write-intensive applications like database or analytic workloads, as well as reduced CPU overhead.
New nvdimm Kickstart command allows unattended installation.
boot manager simplifies the process of creating boot entries
BOOM is a boot manager for Linux systems that use boot loaders supporting the BootLoader Specification for boot entry configuration. It enables flexible boot configuration and simplifies the creation of new or modified boot entries: for example, to boot snapshot images of the system created using LVM.
BOOM does not modify the existing boot loader configuration, and only inserts additional entries. The existing configuration is maintained, and any distribution integration, such as kernel installation and update scripts, continue to function as before.
BOOM has a simplified command-line interface (CLI) and API that ease the task of creating boot entries.
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RHCSA7: Task of the day
Allowed time: 10 minutes.
Create an EXT4 file system mounted under /vol based on a logical volume of 100MB.
Reduce the size to 60MB.
RHCE7: Task of the day
Allowed time: 10 minutes.
Configure a system to forward all email to a central mail server at 192.168.1.1 (change the IP address accordingly).