The RHEL 7.5 release brings the following main enhancements:
- Security & compliance
- Red Hat Ansible is now integrated with OpenSCAP, generating playbooks directly from scans.
- The SAMBA suite defaults to the SMB protocol version 3.
- Network-Bound Disk Encryption (NBDE) has been improved and now supports automatic decryption of data volumes (see here).
- Performance & efficiency
- Virtual Data Optimizer (VDO) provides storage optimizations (see here, here, here, here and here) through data de-duplication and compression capabilities.
- Distributed File System (DFS) is now supported in the SMB protocol versions 2 and 3, allowing multiple SMB file systems to be seen as a single, virtual system.
- Identity Management and Access Control
- Windows Server 2016 forest is now supported for a cross-forest trust with Identity Management and integration with Active Directory has been enhanced.
- The OpenLDAP suite now uses the OpenSSL library instead of the NSS library.
- SSSD performance has been improved with several missing indexes added.
- The tcpdump utility now supports the virtio-vsock communication device, allowing tcpdump to filter and analyze virtio communication between a hypervisor and a guest virtual machine.
- The DNS3 option is now supported in ifcfg-* files.
- It is now possible to configure NetworkManager to never stop trying to get or renew a lease from a DHCP server until it is successful.
- Changes to the /etc/resolv.conf file are now automatically recognized and applied to running programs.
Although the kernel version is still 3.10 for most of the architectures, 64-bit ARM, IBM POWER9 (little endian) and IBM z Systems get version 4.14 through the kernel-alt packages.
The RHEL 7.5 release deprecates the use of Python 2.
In addition, an official technical overview is available here.
Also, Joe Brockmeier from RedHat wrote an article about Container-related Changes in Red Hat Enterprise Linux 7.5.