7redhat.com Technology overview What’s new in Red Hat Enterprise Linux 7
STRUCTURED LOGGING
Information in log les is now structured, making automated log analysis tools more powerful
and effective. The log le structure is not changed, ensuring that your existing tools and processes
continue to work without requiring modications.
LABELED NFS
Labeled NFS allows customers to deploy more secure environments, including secure virtual
machine home directories stored on NFS servers. Images in a Red Hat Enterprise Virtualization
storage domain can have labels conveniently assigned and issued by the Red Hat
Enterprise Virtualization Manager.
Many types of attacks on a system can be prevented by providing ne-grained control of who
can access system resources. SELinux protection is now available when using NFS, simplifying the
development of secure applications. The Linux kernel has enhanced support for passing SELinux
labels between a client and server using NFS.
netWorkInG
NETWORKMANAGER INTERFACES
NetworkManager has two new user interfaces: a command-line tool (nmcli) and a curses-based,
text user interface (TUI). Nmcli is intended for administrators who prefer command-line access for
managing network services and is useful for remote network administration and managing headless
servers. The TUI replaces system-cong-network-tui and simplies conguring many network
settings for those who do not want to edit conguration les directly.
ACCURATE TIME SYNCHRONIZATION
Red Hat Enterprise Linux 7 beta supports the network time protocol (NTP) implementation Chrony,
which provides more accurate clock synchronization than the network time protocol daemon (ntpd).
Benets of Chrony include:
•Faster synchronization. Chrony usually needs only minutes instead of hours to minimize the time
and frequency error, which is useful on desktops or systems not running 24 hours a day.
•A larger range for frequency correction (100000 ppm vs. 500 ppm) is useful for virtual machines
that have quickly drifting clocks.
•Better response to rapid changes in the clock frequency, useful for virtual machines that have
unstable clocks or for power-saving technologies that don’t keep the clock frequency constant.
•After the initial synchronization, the clock is never stepped, which is useful for applications
needing system time to be monotonic.
•Better stability with temporary asymmetric delays, for example when the link is saturated by a
large download.
•Periodic polling of servers is not required, so systems with intermittent network connections can
still quickly synchronize clocks.
PRECISION TIME PROTOCOL
Red Hat Enterprise Linux 7 beta supports IEEE 1588 PTPv2 (Precision Time Protocol version 2)
in combination with a supported network card. PTP is used to precisely synchronize clocks in an
Ethernet network. When used in conjunction with the appropriate hardware, it is capable of
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