krb5
303
While
purgatory
console output can be useful in diagnosing problems, it is not needed for
kdump
to properly function. As such, if your
Itanium
system resets during a
kdump
operation,
disable console output in
purgatory
by adding
--noio
to the
KEXEC_ARGS
variable in
/etc/
sysconfig/kdump
.
(BZ#436426)
70
4.15. krb5
Kerberos 5 is a network authentication system which authenticates clients and servers to each other
using symmetric key encryption and a trusted third party, the KDC.
• The format of a stash file, while not architecture-specific, is endian-specific. Consequently, a
stash file is not directly portable between big-endian and little-endian systems. When setting up a
secondary KDC where the endianness differs from that of the master KDC, the stash file should be
recreated by running '
kdb5_util create -s
' on the secondary and supplying the original master
password.
(BZ#514741)
71
4.16. kvm
Kernel-based Virtual Machine (KVM) is a full virtualization solution for Linux on x86 hardware.
KVM is a Linux kernel module built for the standard Red Hat Enterprise Linux kernel. KVM can run
multiple unmodified, virtualized guest Windows and Linux operating systems. KVM is a hypervisor
which uses the libvirt virtualization tools (virt-manager and virsh).
• By default, KVM virtual machines created in Red Hat Enterprise Linux 5.4 have a virtual Realtek
8139 (rtl8139) network interface controller (NIC). The rtl8139 virtual NIC works fine in most
environments, but may suffer from performance degradation issues on some networks for example,
a 10 GigE (10 Gigabit Ethernet) network.
One workaround for this issue is switch to a different type of virtual NIC, for example, Intel
PRO/1000 (e1000) or virtio (a virtual I/O driver for Linux that can talk to the hypervisor).
To switch to e1000:
1. Shutdown the guest OS
2. Edit the guest OS definition with the command-line tool virsh:
virsh edit GUEST
3. Locate the network interface section and add a model line as shown:
<interface type='network'>
...
<model type='e1000' />
</interface>
4. Save the changes and exit the text editor
5. Restart the guest OS
Summary of Contents for ENTERPRISE 5.4 RELEASE NOTES
Page 1: ...Red Hat Enterprise Linux 5 4 Technical Notes Every Change to Every Package ...
Page 18: ...xviii ...
Page 306: ...288 ...
Page 464: ...446 ...
Page 466: ...448 ...
