Red Hat Enterprise Linux 5.7, the latest  update to the solid 5.x branch, has been released. After a couple of  months in beta, it is available for all Red Hat Enterprise Linux 5  subscribers. As with all minor updates, the focus is on bug fixes and  stability, but there are several new features as well.
Improvements to Xen virtualization should be noted since Red Hat has  deprecated the Xen hypervisor in favor of the newer KVM, in RHEL 6. 
"Red Hat today announced the general availability of the seventh  update to its Red Hat Enterprise Linux 5 platform with Red Hat  Enterprise Linux 5.7," Red Hat announced.
"This release is important for our customers who wish to remain on Red  Hat Enterprise Linux 5 while gaining some of the benefits of Red Hat  Enterprise Linux 6," it said.
One of the more important additions is support for SCAP, which stands  for Security Content Automation Protocol, implemented via OpenSCAP. 
The technology was first introduced in Fedora 14 and has now made it  into Red Hat's 5.x branch.
The tool should make it easier for administrators to verify the security  levels of their Red Hat installs.
Red Hat Enterprise Linux 5.7 also adds support for the Subscription  Manager which was first introduced in RHEL 6.0. 
The new tool makes subscription management easier, for Red Hat at least,  by assigning a subscription to a specific machine.
RHEL 5.7 brings improvements to the Xen virtualization technology.  Performance of Xen guests should be improved on 32-bit environments. 
Users can now assign 256 disks to virtualized machines rather than 100  as before. Guest boot up time has also been improved.
KVM hasn't been overlooked, there are some updates for the newer  virtualization technology as well, like better CD-ROM emulation, and  fixes for the boot up order of virtual machines.
Download Red Hat Enterprise Linux 5.7 and Red Hat Enterprise Linux 6.1  ISO images can be downloaded  by all existing RHEL subscribers via the Red Hat Networks service.
Download Red Hat Enterprise Linux 5.7 Adds SCAP Support
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