5:26 a.m.
Bonjour,
While shutdowning, I can see, but have not the time to read, some
strange messages on the console. These messages are not logged. Is there
a way to slow down the message display at shutdown.
A good tool would be an "interactive" shutdown: press a key to access
the next displayed page of messages.
Thank you.
--
François Patte
UFR de mathématiques et informatique
Laboratoire CNRS MAP5, UMR 8145
Université Paris Descartes
45, rue des Saints Pères
F-75270 Paris Cedex 06
Tél. +33 (0)6 7892 5822
http://www.math-info.univ-paris5.fr/~patte
5:48 a.m.
On 03/24/18 18:26, François Patte wrote:
While shutdowning, I can see, but have not the time to read, some
strange messages on the console. These messages are not logged. Is there
a way to slow down the message display at shutdown.
The easiest thing to do would be to take a video with your phone. Worked well for me
in the past. I don't recall the messages I was seeing being a concern. The only bit
of advice would be to turn off auto-focus on the camera.
--
Conjecture is just a conclusion based on incomplete information. It isn't a fact.
7:59 a.m.
On 24/03/18 21:48, Ed Greshko wrote:
On 03/24/18 18:26, François Patte wrote:
> While shutdowning, I can see, but have not the time to read, some
> strange messages on the console. These messages are not logged. Is there
> a way to slow down the message display at shutdown.
The easiest thing to do would be to take a video with your phone. Worked well for me
in the past. I don't recall the messages I was seeing being a concern. The only
bit
of advice would be to turn off auto-focus on the camera.
I recently had the same need. A video (using a phone) was not fast enough.
Fortunately I have a serial console attached to a second computer and all the messages
were logged there. I set it up a few years ago and I found it helpful a few times.
HTH
--
Eyal Lebedinsky (fedora(a)eyal.emu.id.au)
9:03 a.m.
Le 24/03/2018 à 13:59, Eyal Lebedinsky a écrit :
On 24/03/18 21:48, Ed Greshko wrote:
> On 03/24/18 18:26, François Patte wrote:
>> While shutdowning, I can see, but have not the time to read, some
>> strange messages on the console. These messages are not logged. Is there
>> a way to slow down the message display at shutdown.
>
>
> The easiest thing to do would be to take a video with your phone.
> Worked well for me
> in the past. I don't recall the messages I was seeing being a
> concern. The only bit
> of advice would be to turn off auto-focus on the camera.
I recently had the same need. A video (using a phone) was not fast enough.
Fortunately I have a serial console attached to a second computer and
all the messages
were logged there. I set it up a few years ago and I found it helpful a
few times.
How do you set up this?
--
François Patte
UFR de mathématiques et informatique
Laboratoire CNRS MAP5, UMR 8145
Université Paris Descartes
45, rue des Saints Pères
F-75270 Paris Cedex 06
Tél. +33 (0)6 7892 5822
http://www.math-info.univ-paris5.fr/~patte
9:18 a.m.
On 03/24/18 20:59, Eyal Lebedinsky wrote:
On 24/03/18 21:48, Ed Greshko wrote:
> On 03/24/18 18:26, François Patte wrote:
>> While shutdowning, I can see, but have not the time to read, some
>> strange messages on the console. These messages are not logged. Is there
>> a way to slow down the message display at shutdown.
>
>
> The easiest thing to do would be to take a video with your phone. Worked well for
me
> in the past. I don't recall the messages I was seeing being a concern. The only
bit
> of advice would be to turn off auto-focus on the camera.
I recently had the same need. A video (using a phone) was not fast enough.
Fortunately I have a serial console attached to a second computer and all the messages
were logged there. I set it up a few years ago and I found it helpful a few times.
None of my systems have serial ports. Luckily, my phone has a good camera. My
DSLR
is even better but I didn't need it.
But these days I wouldn't have to use either method. I have a setup to record video
off of HDMI so I would simply reconfigure my HW.
--
Conjecture is just a conclusion based on incomplete information. It isn't a fact.
10:20 a.m.
On Sat, 24 Mar 2018 22:18:36 +0800
Ed Greshko <ed.greshko(a)greshko.com> wrote:
On 03/24/18 20:59, Eyal Lebedinsky wrote:
>
> Fortunately I have a serial console attached to a second computer and all the
messages
> were logged there. I set it up a few years ago and I found it helpful a few times.
>
>
None of my systems have serial ports. Luckily, my phone has a good camera. My DSLR
is even better but I didn't need it.
Never tried that: netconsole - would that be an option?
"netconsole is a kernel module that sends all kernel log
messages (i.e. dmesg) over the network to another computer,
without involving user space (e.g. syslogd). Name "netconsole" is
a misnomer because it's not really a "console", more like a
remote logging service."
https://wiki.archlinux.org/index.php/Netconsole
HTH
--
Wolfgang Pfeiffer
4:56 p.m.
On 25/03/18 02:20, Wolfgang Pfeiffer wrote:
On Sat, 24 Mar 2018 22:18:36 +0800
Ed Greshko <ed.greshko(a)greshko.com> wrote:
> On 03/24/18 20:59, Eyal Lebedinsky wrote:
>>
>> Fortunately I have a serial console attached to a second computer and all the
messages
>> were logged there. I set it up a few years ago and I found it helpful a few
times.
>>
>>
> None of my systems have serial ports. Luckily, my phone has a good camera. My DSLR
> is even better but I didn't need it.
Never tried that: netconsole - would that be an option?
"netconsole is a kernel module that sends all kernel log
messages (i.e. dmesg) over the network to another computer,
without involving user space (e.g. syslogd). Name "netconsole" is
a misnomer because it's not really a "console", more like a
remote logging service."
https://wiki.archlinux.org/index.php/Netconsole
In my experience the network is taken down before the end of the messages
so you miss some.
I also use remote logging to my server wherever available (syslogd does this).
HTH
--
Eyal Lebedinsky (fedora(a)eyal.emu.id.au)
2:27 a.m.
Le 24/03/2018 à 16:20, Wolfgang Pfeiffer a écrit :
On Sat, 24 Mar 2018 22:18:36 +0800
Ed Greshko <ed.greshko(a)greshko.com> wrote:
> On 03/24/18 20:59, Eyal Lebedinsky wrote:
>>
>> Fortunately I have a serial console attached to a second computer and all the
messages
>> were logged there. I set it up a few years ago and I found it helpful a few
times.
>>
>>
> None of my systems have serial ports. Luckily, my phone has a good camera. My DSLR
> is even better but I didn't need it.
Never tried that: netconsole - would that be an option?
"netconsole is a kernel module that sends all kernel log
messages (i.e. dmesg) over the network to another computer,
without involving user space (e.g. syslogd). Name "netconsole" is
a misnomer because it's not really a "console", more like a
remote logging service."
https://wiki.archlinux.org/index.php/Netconsole
On my f27 there is a netconsole service but, it starts before the
network service and so fails to be launched... As it is a sysv service,
I don't know how to confgure this service to start after network.
--
François Patte
UFR de mathématiques et informatique
Laboratoire CNRS MAP5, UMR 8145
Université Paris Descartes
45, rue des Saints Pères
F-75270 Paris Cedex 06
Tél. +33 (0)6 7892 5822
http://www.math-info.univ-paris5.fr/~patte
12:59 p.m.
On Sun, 25 Mar 2018 09:27:01 +0200
François Patte <francois.patte(a)mi.parisdescartes.fr> wrote:
On my f27 there is a netconsole service but, it starts before the
network service and so fails to be launched... As it is a sysv service,
I don't know how to confgure this service to start after network.
An option then might be to start the network on boot-up as soon
as possible, and on shutdown to take it down as late as possible.
As to the latter see one of the messages of Eyal Lebedinsky in
this thread:
"In my experience the network is taken down before the end of the
messages so you miss some."
Thanks, Eyal, for pointing to this ..
So on shutdown netconsole might be disconnected a little bit too
early, IIUC ...
That is, the order of starting services seems important.
In old sysv, IIRC, it was easy, to order the startup or shutdown
of services with something like creating simple K[NN] or S[NN] links
to maybe /etc/init.d/, -- not so now with systemd ..
A not so helpful starting point might be "man systemd.preset".
Also: the files in /etc/systemd/system/ might give clues.
The trick seems to be for startup to create a netconsole.service
(you might see its status via 'systemctl status netconsole'), and to
start networking before netconsole.
Maybe it's neccessary to create it for
/etc/systemd/system/ via 'systemd-sysv-install enable netconsole'
but that's a guess - don't do it until you're sure about it.
Better try:
/usr/lib/systemd/systemd-sysv-install --help
/usr/lib/systemd/systemd-sysv-install is-enabled netconsole
Yes, that looks strange: it seems systemctl doesn't support natively
netconsole, diverting action to 'systemd-sysv-install'
Look at this:
% systemctl is-enabled netconsole
netconsole.service is not a native service, redirecting to systemd-sysv-install.
Executing: /usr/lib/systemd/systemd-sysv-install is-enabled netconsole
disabled
Some hints on how to organize the timing of startup services:
https://fedoramagazine.org/systemd-unit-dependencies-and-order/
(see 'Unit order' on that page .. )
I have to set up netconsole for myself - so I might be back if I know
more.
HTH
--
Wolfgang Pfeiffer
5:06 p.m.
On 25/03/18 01:18, Ed Greshko wrote:
On 03/24/18 20:59, Eyal Lebedinsky wrote:
> On 24/03/18 21:48, Ed Greshko wrote:
>> On 03/24/18 18:26, François Patte wrote:
>>> While shutdowning, I can see, but have not the time to read, some
>>> strange messages on the console. These messages are not logged. Is there
>>> a way to slow down the message display at shutdown.
>>
>>
>> The easiest thing to do would be to take a video with your phone. Worked well
for me
>> in the past. I don't recall the messages I was seeing being a concern. The
only bit
>> of advice would be to turn off auto-focus on the camera.
>
> I recently had the same need. A video (using a phone) was not fast enough.
>
> Fortunately I have a serial console attached to a second computer and all the
messages
> were logged there. I set it up a few years ago and I found it helpful a few times.
>
>
None of my systems have serial ports.
This is the case for one of my computers, which does not have a serial socket on the
back,
but does have the pins on the mobo allowing attaching a cable. This is still common.
Luckily, my phone has a good camera. My DSLR is even better but I
didn't need it.
But these days I wouldn't have to use either method. I have a setup to record video
off of HDMI so I would simply reconfigure my HW.
--
Eyal Lebedinsky (fedora(a)eyal.emu.id.au)
5:31 p.m.
On 03/25/18 06:06, Eyal Lebedinsky wrote:
This is the case for one of my computers, which does not have a
serial socket on
the back,
but does have the pins on the mobo allowing attaching a cable. This is still common.
Pins are nothing without a UART.
--
Conjecture is just a conclusion based on incomplete information. It isn't a fact.
6:22 p.m.
On 03/24/2018 03:31 PM, Ed Greshko wrote:
On 03/25/18 06:06, Eyal Lebedinsky wrote:
> This is the case for one of my computers, which does not have a serial socket on
> the back,
> but does have the pins on the mobo allowing attaching a cable. This is still common.
Pins are nothing without a UART.
I'm not sure what you mean by this. Some motherboards provide the pin
clusters connected to the onboard UARTS, but not the 9-pin socket that
mounts on the outside. You can get those from various places. I'm sure
I could find several in my collection of older equipment.
6:22 p.m.
On 25/03/18 09:31, Ed Greshko wrote:
On 03/25/18 06:06, Eyal Lebedinsky wrote:
> This is the case for one of my computers, which does not have a serial socket on
> the back,
> but does have the pins on the mobo allowing attaching a cable. This is still common.
Pins are nothing without a UART.
Maybe I was not clear. The pins (2x5) are for attaching a DB9 on a cable, usually on a
bracket.
Naturally, the mobo has a UART. Often two.
--
Eyal Lebedinsky (fedora(a)eyal.emu.id.au)
7:44 p.m.
On 03/25/18 07:22, Eyal Lebedinsky wrote:
On 25/03/18 09:31, Ed Greshko wrote:
> On 03/25/18 06:06, Eyal Lebedinsky wrote:
>> This is the case for one of my computers, which does not have a serial socket on
>> the back,
>> but does have the pins on the mobo allowing attaching a cable. This is still
common.
>
>
> Pins are nothing without a UART.
Maybe I was not clear. The pins (2x5) are for attaching a DB9 on a cable, usually
on a bracket.
Naturally, the mobo has a UART. Often two.
I suppose you need to ask the OP if they have a DB9 connector on the back of their
case. If not, they can easily use "setserial" to determine if they do have a
UART.
If they do, then they could run down to their computer store and get the HW they need
to fix it up if they feel comfortable doing that.
Or, they could try using a camera. Our Galaxy S4 was up to the task. This was years
ago, but I sort of recall turning the monitor's brightness high and the ISO also high
and used AF-Lock. Worked just fine, for me.
--
Conjecture is just a conclusion based on incomplete information. It isn't a fact.
2:29 a.m.
Le 24/03/2018 à 11:48, Ed Greshko a écrit :
On 03/24/18 18:26, François Patte wrote:
> While shutdowning, I can see, but have not the time to read, some
> strange messages on the console. These messages are not logged. Is there
> a way to slow down the message display at shutdown.
The easiest thing to do would be to take a video with your phone. Worked well for me
in the past. I don't recall the messages I was seeing being a concern. The only
bit
of advice would be to turn off auto-focus on the camera.
My phone is a phone and has no video application. I am a man from the past!
--
François Patte
UFR de mathématiques et informatique
Laboratoire CNRS MAP5, UMR 8145
Université Paris Descartes
45, rue des Saints Pères
F-75270 Paris Cedex 06
Tél. +33 (0)6 7892 5822
http://www.math-info.univ-paris5.fr/~patte
2231
days inactive
2232
days old
14 comments
5 participants
participants (5)
-
Ed Greshko -
Eyal Lebedinsky -
François Patte -
Samuel Sieb -
Wolfgang Pfeiffer