2010/6/17 Dan Williams d...@redhat.com:
On Mon, 2010-06-14 at 23:16 +0300, Fırat Birlik wrote:
Hi there,
I experience a problem with hostname manipulation of NetworkManager
and the X session. DHCP server sends a hostname within the dhcp
offer, which is different the current one. There is no persistent
hostname definition within the 'nm-system-settings.conf' as this is a
default installation. NetworkManager just changes the hostname and as
new hostname is not authenticated (xhost cookie MIT-MAGIC-COOKIE-1 for
new hostname does not exist) no new application can be started
afterwards.
The solution is *not* to use hostname for local X authentication at all.
Instead, you want to allow all connections via Unix sockets from the
session user, which means that your X init should be doing something
like this:
[ -x /usr/bin/xhost ] [ -x /usr/bin/id ]
xhost +si:localuser:`id -un` /dev/null
which normally goes in 'localuser.sh' in /etc/X11/xinit/xinitrc.d or
wherever scripts get executed during X init time. Hostnames do change
and relying on it for something like local authentication will certainly
break stuff.
Thanks for pointing that out, I think this is the solution for major
part of the problem, instead of forcing a persistent hostname.
But there is also SESSION_MANAGER variable and xauth list, because
both depend on the previous hostname. Do you have any tips for these
also?
Firat
Most distros have had this fixed for a while now.
Dan
To avoid this behavior, I can define a persistent hostname equal the
content of /etc/HOSTNAME (this is a slackware system) as the
following:
--- /etc/NetworkManager/nm-system-settings.conf~
+++ /etc/NetworkManager/nm-system-settings.conf
@@ -1,2 +1,5 @@
[main]
plugins=keyfile
+
+[keyfile]
+hostname=myhostname
As persistent hostname has highest precedence, problem looks solved;
but this should be repeated for each installation.
What I'm asking is, is there any config option or some way to not let
NetworkManager change the hostname?
As a note, current precedence order for hostname (taken from
NetworkManagerPolicy.c):
* 1) a configured hostname (from system-settings)
* 2) automatic hostname from the default device's config (DHCP, VPN,
etc)
* 3) the original hostname when NM started
* 4) reverse-DNS of the best device's IPv4 address
Thanks,
Firat
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