What's the matter with build-in netconsole?

What's the matter with build-in netconsole?

[Park Lee]

Hi,
  I try to use netconsole to keep Linux kernel oops to
another machine. I've compiled netconsole into the
kernel (i.e. select CONFIG_NETCONSOLE=y, when run
'make menuconfig'). 
  After that, I put
"netconsole=@/,514@192.168.0.1/00:02:3F:03:D2:59"
(which is described in
/usr/src/linux/Documentation/networking/netconsole.txt)
to the kernel command line as provided by grub and
rerun my machine with the new compiled kernel.
  But then, when the system is booting, it shows the
following message:

... ...
Uncompressing Linux... Ok, booting the kernel.
audit(1103234064.4294965842:0): initialized
netconsole: eth0 doesn't exist, aborting.
... ...

  Then, What's the matter with the build-in
netconsole? Have I misconfiged the netconsole? and How
to really run build-in netconsole?

  Thank you.


=====
Best Regards,
Park Lee

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Re: What's the matter with build-in netconsole?

[Paulo Marques]

Park Lee wrote:
> [...]
>   But then, when the system is booting, it shows the
> following message:
> 
> ... ...
> Uncompressing Linux... Ok, booting the kernel.
> audit(1103234064.4294965842:0): initialized
> netconsole: eth0 doesn't exist, aborting.
> ... ...

Just a shot in the dark here... maybe your compiling your network driver 
as a module and netconsole can not use it because it is not loaded soon 
enough.

If this is the case you should compile your network driver builtin.

-- 
Paulo Marques - www.grupopie.com

"A journey of a thousand miles begins with a single step."
Lao-tzu, The Way of Lao-tzu

Issue on netconsole vs. Linux kernel oops

[Park Lee]

Hi,
  I'd like to use netconsole to send local Linux
kernel's final messages (i.e. oops) to remote machine
when the kernel crashes. 
  Now I can successfully use a built-in netconsole to
send some loacl kernel messages to the remote machine.
(the parameter I send to local kernel on kernel
command line is
"netconsole=@192.168.0.2/,514@192.168.0.1/", I run
syslogd in remote machine). For example, When the
local kernel is booting, it will send a message
"192.168.0.2 audit(1103247021.091:0): initialized" to
remote machine through netconsole, and the syslogd on
remote machine will write the message to
/var/log/messages on remote machine.
  What CONFUSE me most is that when the kernel
crashes, there is NO message (oops) about the crash
being wrote down by syslogd on remote machine to
remote /var/log/messages file at all!! 
  But in the mean time, We can see the outputs of
tcpdump on the remote machine, they are some thing
like the following:

01:36:56.692877 IP 192.168.0.2.6665 >
192.168.0.1.syslog: UDP, length 48
01:36:56.692930 IP 192.168.0.2.6665 >
192.168.0.1.syslog: UDP, length 29
01:36:56.692982 IP 192.168.0.2.6665 >
192.168.0.1.syslog: UDP, length 15
01:36:56.693034 IP 192.168.0.2.6665 >
192.168.0.1.syslog: UDP, length 9
01:36:56.693086 IP 192.168.0.2.6665 >
192.168.0.1.syslog: UDP, length 16
01:36:56.693121 IP 192.168.0.2.6665 >
192.168.0.1.syslog: UDP, length 16
   ... ...

  From these messages, we can see that the netconsole
actually have sent the final messages (oops) to remote
machine when the local kernel crashed. But there are
no corresponding messages recorded by syslogd on
remote machine to /var/log/messages.

  Then, Where are these messages go? Do they disappear
themselves? 
  Is this a fault in netconsole or in syslogd, or Am I
miss to configure something obvious? Would you please
give me some hints on solving this problem?

  Thank you very much.



=====
Best Regards,
Park Lee


		
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Re: Issue on netconsole vs. Linux kernel oops

[Matt Mackall]

On Thu, Dec 16, 2004 at 10:48:27AM -0800, Park Lee wrote:
> Hi,
>   I'd like to use netconsole to send local Linux
> kernel's final messages (i.e. oops) to remote machine
> when the kernel crashes. 
>   Now I can successfully use a built-in netconsole to
> send some loacl kernel messages to the remote machine.
> (the parameter I send to local kernel on kernel
> command line is
> "netconsole=@192.168.0.2/,514@192.168.0.1/", I run
> syslogd in remote machine). For example, When the
> local kernel is booting, it will send a message
> "192.168.0.2 audit(1103247021.091:0): initialized" to
> remote machine through netconsole, and the syslogd on
> remote machine will write the message to
> /var/log/messages on remote machine.
>   What CONFUSE me most is that when the kernel
> crashes, there is NO message (oops) about the crash
> being wrote down by syslogd on remote machine to
> remote /var/log/messages file at all!! 
>   But in the mean time, We can see the outputs of
> tcpdump on the remote machine, they are some thing
> like the following:
> 
> 01:36:56.692877 IP 192.168.0.2.6665 >
> 192.168.0.1.syslog: UDP, length 48
> 01:36:56.692930 IP 192.168.0.2.6665 >
> 192.168.0.1.syslog: UDP, length 29
> 01:36:56.692982 IP 192.168.0.2.6665 >
> 192.168.0.1.syslog: UDP, length 15
> 01:36:56.693034 IP 192.168.0.2.6665 >
> 192.168.0.1.syslog: UDP, length 9
> 01:36:56.693086 IP 192.168.0.2.6665 >
> 192.168.0.1.syslog: UDP, length 16
> 01:36:56.693121 IP 192.168.0.2.6665 >
> 192.168.0.1.syslog: UDP, length 16
>    ... ...
> 
>   From these messages, we can see that the netconsole
> actually have sent the final messages (oops) to remote
> machine when the local kernel crashed. But there are
> no corresponding messages recorded by syslogd on
> remote machine to /var/log/messages.

>From your description, it sounds like syslogd is at fault. Try using
netcat on the remote machine.

-- 
Mathematics is the supreme nostalgia of our time.

Re: Issue on netconsole vs. Linux kernel oops

[linux-os]

On Thu, 16 Dec 2004, Matt Mackall wrote:

> On Thu, Dec 16, 2004 at 10:48:27AM -0800, Park Lee wrote:
>> Hi,
>>   I'd like to use netconsole to send local Linux
>> kernel's final messages (i.e. oops) to remote machine
>> when the kernel crashes.
>>   Now I can successfully use a built-in netconsole to
>> send some loacl kernel messages to the remote machine.
>> (the parameter I send to local kernel on kernel
>> command line is
>> "netconsole=@192.168.0.2/,514@192.168.0.1/", I run
>> syslogd in remote machine). For example, When the
>> local kernel is booting, it will send a message
>> "192.168.0.2 audit(1103247021.091:0): initialized" to
>> remote machine through netconsole, and the syslogd on
>> remote machine will write the message to
>> /var/log/messages on remote machine.
>>   What CONFUSE me most is that when the kernel
>> crashes, there is NO message (oops) about the crash
>> being wrote down by syslogd on remote machine to
>> remote /var/log/messages file at all!!
>>   But in the mean time, We can see the outputs of
>> tcpdump on the remote machine, they are some thing
>> like the following:
>>
>> 01:36:56.692877 IP 192.168.0.2.6665 >
>> 192.168.0.1.syslog: UDP, length 48
>> 01:36:56.692930 IP 192.168.0.2.6665 >
>> 192.168.0.1.syslog: UDP, length 29
>> 01:36:56.692982 IP 192.168.0.2.6665 >
>> 192.168.0.1.syslog: UDP, length 15
>> 01:36:56.693034 IP 192.168.0.2.6665 >
>> 192.168.0.1.syslog: UDP, length 9
>> 01:36:56.693086 IP 192.168.0.2.6665 >
>> 192.168.0.1.syslog: UDP, length 16
>> 01:36:56.693121 IP 192.168.0.2.6665 >
>> 192.168.0.1.syslog: UDP, length 16
>>    ... ...
>>
>>   From these messages, we can see that the netconsole
>> actually have sent the final messages (oops) to remote
>> machine when the local kernel crashed. But there are
>> no corresponding messages recorded by syslogd on
>> remote machine to /var/log/messages.
>
>> From your description, it sounds like syslogd is at fault. Try using
> netcat on the remote machine.
>
> -- 
> Mathematics is the supreme nostalgia of our time.


Depends upon the vendor of your installation, but some require
loghost to be defined in /etc/hosts as the same as localhost and
/etc/nsswitch.conf configured to actually look at that.


Cheers,
Dick Johnson
Penguin : Linux version 2.6.9 on an i686 machine (5537.79 BogoMips).
  Notice : All mail here is now cached for review by Dictator Bush.
                  98.36% of all statistics are fiction.

Re: Issue on netconsole vs. Linux kernel oops

[Park Lee]

On Thu, 16 Dec 2004 at 14:06, Dick Johnson wrote:
>
> Depends upon the vendor of your installation, but 
> some require loghost to be defined in /etc/hosts as 
> the same as localhost and /etc/nsswitch.conf 
> configured to actually look at that.

Now, I'm using Fedora Core 2. Would you please tell us
Is there any limitation of it? 

Thank you.



=====
Best Regards,
Park Lee


		
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Re: What's the matter with build-in netconsole?

[Matt Mackall]

On Thu, Dec 16, 2004 at 06:35:37AM -0800, Park Lee wrote:
> Hi,
>   I try to use netconsole to keep Linux kernel oops to
> another machine. I've compiled netconsole into the
> kernel (i.e. select CONFIG_NETCONSOLE=y, when run
> 'make menuconfig'). 
>   After that, I put
> "netconsole=@/,514@192.168.0.1/00:02:3F:03:D2:59"
> (which is described in
> /usr/src/linux/Documentation/networking/netconsole.txt)

You have to configure a source IP address for built-in netconsole, as
interfaces normally don't have addresses assigned to them until init.

> to the kernel command line as provided by grub and
> rerun my machine with the new compiled kernel.
>   But then, when the system is booting, it shows the
> following message:
> 
> ... ...
> Uncompressing Linux... Ok, booting the kernel.
> audit(1103234064.4294965842:0): initialized
> netconsole: eth0 doesn't exist, aborting.
> ... ...
> 
>   Then, What's the matter with the build-in
> netconsole? Have I misconfiged the netconsole? and How
> to really run build-in netconsole?

Is your network driver built in? Is it eth0 (you let netconsole use
the default)? Is it initialized before netconsole? Please send your
_entire_ dmesg.

-- 
Mathematics is the supreme nostalgia of our time.