I missed your first email, but we do this in our installs.
The el7 anaconda uses tmux underneath, which can be exploited to display whatever you want or even interact with a user.
The first thing we do, is change the provided rsyslog.conf to log to our central server, which serves most of our needs. something like the following in a %pre script will get you most of the logs from the installer:
# wget https://your.server/rsyslog.conf -O /etc/rsyslog.conf
# systemctl restart rsyslog
This can be further used to display logs using some tmux commands. e.g:
# tmux new-window -a -n logging 'tail -F /path/to/log/file.log'
We take this a step further, and use tmux to run our %pre and %post scripts directly.
# tmux new-window -a -n prescript 'python /tmp/pre.py'
# while [ ! -f /tmp/predone ] # do # sleep 1 # done
# tmux kill-window -t prescript
This sort of setup can also be used with xloadimage to launch a non-blocking script to paste an image to the screen while the text mode installer is running.
I hope this helps.
Ross Smith <rjsm@xxxxxxxxx>
College of Engineering - CAEN - Linux Support
On Wed, Mar 2, 2016 at 4:45 AM, therbur <fxb7-ox9n@xxxxxxxxxxxxxxx> wrote:
Since nobody responded, I spent days looking around on this and
experimenting.
It makes no sense to me that the ability to both log and display
output is not intrinsic to kickstart.
Note that the %pre --log parameter does not work, it always
results in a 0-length log file.
Also, the example of that option in:
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/Installation_Guide/sect-kickstart-syntax.html#sect-kickstart-preinstall
is completely wrong anyway because it's logging %pre output to
the non-existent built image.
Summary of the solution that works for me for CentOS 7 kickstart:
%pre --erroronfail
exec < /dev/tty3 > /dev/tty3
chvt 3
(
echo ...
) 2>&1 | /usr/bin/tee /tmp/pre.log
%end
%post --nochroot --erroronfail
cp /tmp/pre.log /mnt/sysimage/root/
%end
%post --erroronfail
exec < /dev/tty3 > /dev/tty3
chvt 3
(
echo ...
) 2>&1 | /usr/bin/tee /root/ks-post.log
therbur <fxb7-ox9n@xxxxxxxxxxxxxxx> wrote:
>The following method has worked for years with CentOS 5, to allow
>live viewing of %post output and also logging it. It doesn't
>work in CentOS 7. What is the recommended method now?
>
># from kickstart text mode install
>
>%post --erroronfail
>
>chvt 3
>exec < /dev/tty3 > /dev/tty3 2> /dev/tty3
>
>tail -F /root/ks-post.log &
>(
>
>echo "Starting post-kickstart ..."
>
># ... various commands
>
>echo "Done."
>echo
>echo "Do Alt-F1 and press Enter to reboot"
>
>) >> /root/ks-post.log 2>&1
>
>%end
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