Brief introduction
Red Hat Enterprise Linux is Red Hat's Linux distribution, for the commercial market, including mainframes. Red Hat began offering 10 years of support for each version of the LINUX Enterprise from Red Hat Enterprise Linux 5. The Red Hat Enterprise Linux often simplified as RHEL.
Red Hat Enterprise Linux about three years to release a new version.
download
RHEL is the commercial version, is not available for free download and use. Need to buy Red Hat's business services can legally obtain and get commercial support.
You can use open source derivative version of RHEL to get the same support in addition to commercial software, such as: CentOS.
issued
Initially, Red Hat Enterprise Linux based on Red Hat Linux, but using a more conservative release cycle. Later versions are based on Fedora. About every six versions of Fedora have a new version of Red Hat Enterprise Linux release, thus:
Red Hat Linux 6.2 → Red Hat Linux 6.2E
Red Hat Linux 7.2 → Red Hat Enterprise Linux 2.1
Red Hat Linux 9 → Red Hat Enterprise Linux 3
Fedora Core 3 → Red Hat Enterprise Linux 4
Fedora Core 6 → Red Hat Enterprise Linux 5
Fedora 12 → Red Hat Enterprise Linux 6
Fedora 19 → Red Hat Enterprise Linux 7
current version
1, Red Hat Enterprise Linux 7.0 currently supports only 64-bit CPU: 64-bit AMD, 64-bit Intel, IBM POWER7 and POWER8, IBM System z. 32-bit operating system can run as a virtual machine, RHEL versions prior to include.
2, contains Kernel 3.10 version, supports the swap memory compression ensures significantly reduce I / O and improve performance, the use of NUMA (uniform memory access) scheduling and memory allocation, support for APIC (Advanced Programmable Interrupt Controller) virtualization, comprehensive DynTick support, kernel modules will be blacklisted, kpatch dynamic kernel patch (technology preview), and so on.
3, storage and file systems, RHEL 7.0 using the LIO kernel target subsystem, support for fast device to provide caching for a slower block devices, the introduction of the LVM cache (technology preview), the XFS file system as the default.
4, the introduction of network packet technology as a bundled backup method for link aggregation, extensive improvements to NetworkManager provides dynamic firewall daemon firewalld, adding DNSSEC Domain Name System Security Extensions, with OpenLMI used to manage Linux systems provide common infrastructure, the introduction of trusted network connectivity (preview technology) and the like.
5, KVM provided (Kernel-based virtualization) a number of improvements, such as using virtio-blk-data-plane improve fast I / O performance (technology preview), supporting PCI bridge, the QEMU sandbox, multi-queue NIC, USB 3.0 support (technical preview) and so on.
6, the introduction of Linux container Docker.
7, compiler tool chains, RHEL 7.0 includes GCC 4.8.x, glibc 2.17, GDB 7.6.1.
8, included Ruby 2.0.0, Python 2.7.5, Java 7 and other programming languages.
9 includes Apache 2.4, MariaDB 5.5, PostgreSQL 9.2 and so on.
10, in the systems and services, RHEL 7.0 using systemd replaces SysV.
11, introduced Pacemaker cluster manager, and use keepalived HAProxy replace the load balancing program Piranha.
12, moreover, the installer Anaconda also been redesigned and enhanced, using the boot loader GRUB 2.
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