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Tom Horsley 05-30-2011 11:31 PM

/var/log/messages question
 
On Mon, 30 May 2011 16:05:07 -0700
Peter Gordon wrote:

> imklog 5.7.9, log source = /proc/kmsg started.

Yea, the same thing starts mine, but I just thought
it would be nice to have something more obvious
(and perhaps less likely to change someday :-).
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Timothy Murphy 05-31-2011 12:42 AM

/var/log/messages question
 
Tom Horsley wrote:

> If would be real convenient to have a known string to
> search for that always precedes the rest of the messages
> in a new boot.

I agree.
Even a couple of blank lines would help.


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s-mail: School of Mathematics, Trinity College, Dublin 2, Ireland

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Joe Zeff 05-31-2011 02:07 AM

/var/log/messages question
 
On 05/30/2011 05:42 PM, Timothy Murphy wrote:
> Tom Horsley wrote:
>
>> If would be real convenient to have a known string to
>> search for that always precedes the rest of the messages
>> in a new boot.
>
> I agree.
> Even a couple of blank lines would help.
>
>

Indeed. Am I the only one on the list that thinks that XYZZY would be
appropriate?
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john wendel 05-31-2011 02:16 AM

/var/log/messages question
 
On 05/30/2011 07:07 PM, Joe Zeff wrote:
> On 05/30/2011 05:42 PM, Timothy Murphy wrote:
>> Tom Horsley wrote:
>>
>>> If would be real convenient to have a known string to
>>> search for that always precedes the rest of the messages
>>> in a new boot.
>>
>> I agree.
>> Even a couple of blank lines would help.
>>
>>
>
> Indeed. Am I the only one on the list that thinks that XYZZY would be
> appropriate?


Nothing happens!

John

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Tim 05-31-2011 03:11 AM

/var/log/messages question
 
On Mon, 2011-05-30 at 18:36 -0400, Tom Horsley wrote:
> Just for curiosity, why has no one ever arranged to
> log something like "Hey! I'm booting the system again!"
> as the very first line in that goes to /var/log/messages
> when the system is booting?

I used to do something like that back when I was still using another OS.
I modified the bootup script to add my own entry at the beginning. You
could do the same, I don't think the script gets changed by updates that
often.

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2.6.27.25-78.2.56.fc9.i686

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Patrick O'Callaghan 05-31-2011 03:52 AM

/var/log/messages question
 
On Mon, 2011-05-30 at 19:07 -0700, Joe Zeff wrote:
> On 05/30/2011 05:42 PM, Timothy Murphy wrote:
> > Tom Horsley wrote:
> >
> >> If would be real convenient to have a known string to
> >> search for that always precedes the rest of the messages
> >> in a new boot.
> >
> > I agree.
> > Even a couple of blank lines would help.
> >
> >
>
> Indeed. Am I the only one on the list that thinks that XYZZY would be
> appropriate?

You are in a maze of twisty little passages, all alike ...

poc

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Robert Nichols 05-31-2011 05:15 AM

/var/log/messages question
 
On 05/30/2011 09:07 PM, Joe Zeff wrote:
> On 05/30/2011 05:42 PM, Timothy Murphy wrote:
>> Tom Horsley wrote:
>>
>>> If would be real convenient to have a known string to
>>> search for that always precedes the rest of the messages
>>> in a new boot.
>>
>> I agree.
>> Even a couple of blank lines would help.
>>
>>
>
> Indeed. Am I the only one on the list that thinks that XYZZY would be
> appropriate?

A hollow voice says, "Plugh."

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Do NOT delete it.

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"R. G. Newbury" 05-31-2011 02:25 PM

/var/log/messages question
 
> On Mon, 2011-05-30 at 18:36 -0400, Tom Horsley wrote:
>> > Just for curiosity, why has no one ever arranged to
>> > log something like "Hey! I'm booting the system again!"
>> > as the very first line in that goes to /var/log/messages
>> > when the system is booting?
> I used to do something like that back when I was still using another OS.
> I modified the bootup script to add my own entry at the beginning. You
> could do the same, I don't think the script gets changed by updates that
> often.

It is far easier to add: echo "Completed boot at `date`"

to the bottom of /etc/rc.d/rc.local

Then it does not matter whether the system is using the old method or
systemd and whether it is writing to 'messages' or boot.log.


R. Geoffrey Newbury

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Phil Meyer 05-31-2011 04:17 PM

/var/log/messages question
 
On 05/31/2011 08:25 AM, R. G. Newbury wrote:
>> On Mon, 2011-05-30 at 18:36 -0400, Tom Horsley wrote:
>>>> Just for curiosity, why has no one ever arranged to
>>>> log something like "Hey! I'm booting the system again!"
>>>> as the very first line in that goes to /var/log/messages
>>>> when the system is booting?

It does.
There are several ways to find the top of the last boot.
Assuming that you have rebooted since the last time /var/log/messages
was rolled over, you can easily search for the top of the messages.

Here are a couple of guidelines:

First, the word ' Linux ', note the spaces, is not common in the logs,
and always appears near the top of the boot sequence. Usually within
the first 4 or 5 lines.

Second, no matter how fast your system reboots, the messages written at
boot time will be written in a faster sequence than what was happening
before the reboot, thus giving an obvious 'break' in the log time stamps
at the beginning of a boot.

If you check more than a few times, you will notice that syslog itself
reports the first line of boot, and you can search for that.

So in summary, if you see a syslog startup, followed within a few lines
by the word ' Linux ', and what comes after that appear to be BIOS info,
and that all these messages happen in the same second or two, you have
found the top of the boot sequence.

Here is the top of my last boot:

...
May 30 08:11:27 grok kernel: imklog 5.7.9, log source = /proc/kmsg started.
May 30 08:11:27 grok rsyslogd: [origin software="rsyslogd"
swVersion="5.7.9" x-pid="802" x-info="http://www.rsyslog.com"] start
May 30 08:11:27 grok kernel: [ 0.000000] Initializing cgroup subsys
cpuset
May 30 08:11:27 grok kernel: [ 0.000000] Initializing cgroup subsys cpu
May 30 08:11:27 grok kernel: [ 0.000000] Linux version
2.6.38.6-27.fc15.x86_64 (mockbuild@x86-03.phx2.fedoraproject.org) (gcc
version 4.6.0 20110428 (Red Hat 4.6.0-6) (GCC) ) #1 SMP Sun May 15
17:23:28 UTC 2011
...

Good Luck!
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Tom Horsley 05-31-2011 04:28 PM

/var/log/messages question
 
On Tue, 31 May 2011 10:17:56 -0600
Phil Meyer wrote:

> So in summary, if you see a syslog startup, followed within a few lines
> by the word ' Linux ', and what comes after that appear to be BIOS info,
> and that all these messages happen in the same second or two, you have
> found the top of the boot sequence.

All of which make my point that it would sure be a lot
simpler if there was merely a known string always printed
at the top :-).

At one time I relied on timestamp gaps till I was trying to
figure out the logs on a system where ntp was fighting
with something else and the time kept wildly swinging
on the running system.
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