Introduction to new features of RHEL7.0

1. RHEL7 new features: 1.1. Identity Management

? Kerberos's cross-platform trust mechanism: Kerberos is fully compatible with the Microsoft Active Directory, enabling full use of Active Directory authentication.

? REALMD: This feature simplifies the configuration of Rhel into the Microsoft Active Directory and supports Autodiscover domain information.

Rhel 7 adds two key new features that improve the way Rhel works with AD. A cross-domain trust (Cross-realm trusts) is now established between RHEL 7 and AD, so ad users can access resources without logging on to the Linux side. Another ad-related feature added by RHEL 7 is REALMD, which automates querying and adding DNS information for AD (or other Red Hat authentication services).

1.2. Performance management

? Performance AIDS: RHEL7 provides a new framework and a new general-purpose graphical interface to help manage. System bottlenecks can be collected and analyzed.

? tuning and Tuning configuration: RHEL7 provides dynamic tuning solutions to address system performance bottlenecks. System administrators can also manually modify the system presets to achieve the tuning effect

1.3. Virtualization

? Enhanced RHEL7 Virtual machine: Fully compatible with Vmwarevshpere architecture, RHEL7 with open Vmtool, 3D graphics driver, and OpenGLX11 support. Makes RHEL7 easier to deploy on VMware platforms. RHEL 7 also supports fast communication between VMware ESXi.

? Virtual I/O: Provides an interface for each virtual machine to invoke the underlying PCI device for kernel-level isolation. Improved machine safety and compatibility

? More high-performance KVM kernel virtualization support
? virtual machine USB3.0 interface support
? QCOW2 format file-type snapshot support
Nested virtualization support, can be installed in KVM configuration OpenStack
? continue to support Xen technology as a virtual machine, but no longer supports Xen technology as a sending host
? Enhanced technical support for VMware with Open-vm-tools replacement Vm-tools
? RHEL 7 Container-type virtualization
? support for LXC container-type virtualization
? Support for the hottest technology docker

The new feature of the most bright eye in RHEL 7 belongs to Docker.
Docker is based on the current popular Application virtualization technology. Applications are packaged in Docker and completely isolated from the system and other applications, so they can be migrated between systems and run properly. RHEL 7 leverages Docker technology fully and efficiently, so there is no contention for resources between applications
? provide the latest RHEL7 docker image
? support for self-built Docker Register

1.4. Installation and Deployment

Upgrade Assistant: Provides upgrade assistant that can be upgraded to RHEL7 with the original operating system data preserved

Partition rollback: Use the LVM mechanism to take a snapshot of a partition and then use it as a recovery data source when appropriate.

? The batch deployment script supports the deployment with Active Directory: You can add an option to the Active Directory in the deployment script when the operating system is deployed, and the Active Directory is automatically added to the system deployment, reducing future settings.

? Create custom installation media: You can customize your own RHEL7 according to your needs.

? deploying servers using templates

1.5. File system

? RHEL7 selects XFS as its default file system.

RHEL7.0 The default use of XFS when installing, not to say that the original Ext file system is no longer used, RHEL 7 is still supporting EXT4. Instead, the Ext file system has become more and more inadequate in the face of future exploding data volumes. The XFS file system is full of big data, with a single file system that can support up to 8eb-1b size, a single file size of up to 16T, and a rich logging system that is a powerful file system for big data storage.

XFS is a highly scalable, high-performance file system. is also the default file system for RHEL7/CENTOS7.

XFS supports metadata journaling (metadata logging) of the journaled file system, which enables it to recover more quickly from crash.

It also supports defragmentation and scaling in a state of mount and activity.

The XFS file system can be backed up and restored through tools Xfsdump and Xfsrestore,

Xfsdump can use the dump level to complete incremental backups, and can also exclude files by Size,subtree,inode flags.

User, group, project quotas are also supported.

1.6. Network Management

? Add Network Management interface NMCLI

? Accurate time synchronization, intermittent synchronization time (NTPD).

Precision time protocol, more accurate than network Time protocol

1.7. Service Management

? Invoking a service script using Systemctl

The RHEL7 uses SYSTEMD instead of the original SYSV, which is used by SYSTEMD to manage the services in the system. is undoubtedly a challenge for older system administrators. SYSTEMD defines the way in which service and system processes are managed in a completely different manner from the original SYSV init process. Enables services in the system to automatically resolve dependencies between services, and can support the parallel start of services! In other words, RHEL7.0 is faster and more stable than the original SYSV operating system, and can also be perfectly supported docker!

1.8. RHEL7 Desktop

Use the latest Gnome 3 as the default desktop environment, using the latest KDE 4.10 as an alternative desktop environment.

Other Features:

1, integrated Open-vmtool, provide good compatibility in VMware environment
2, Integrated IPA (Red Hat initiated open source certification management project) support
3, the use of new firewall to replace the original iptables, firewall re-upgrade, diversified comprehensive firewall management
4, using the 3.10 kernel, support more new features, such as in large memory (3TB) Case of Kdump support
5. Internal integrated MARIADB support, redefine open source database

Summarize:

RHEL7 the biggest change for developers is kernel upgrade to 3.10
RHEL7 the biggest change for system managers is that the system and service management program is modified to SYSTEMD
RHEL7 the biggest change for network operations personnel is that network management programs and services are modified to NetworkManager
RHEL7 the biggest change for storage engineers is that the iSCSI export service is modified to Lio kernel Target Subsystem
RHEL7 the best news for cloud engineers is native support for KVM nested virtualization and Docker container virtualization

Introduction to new features of RHEL7.0