[outages] [Outages-discussion] Level3 Routing...

[Jeremy Chadwick]

On Fri, Feb 28, 2014 at 09:23:06PM -0500, staticsafe wrote:
> On 2/28/2014 20:49, Jeremy Chadwick wrote:
> > I'd suggest setting up a cron job that logs the mtr data on two systems
> > (system A, going from A->B, and system B, going from B->A), so that you
> > can review it if/when it happens again.
> > 
> > I have a small shell script I wrote, which uses a dorky config file of
> > sorts, that can do this for you if you want me to provide it.  I use it
> > on my home FreeBSD system, and my FreeBSD VPS system, checking
> > connectivity between them (and to some other places as well).
> > 
> 
> Something like this would be much appreciated. I was thinking of writing
> a similar script to mail mtr output on an hourly basis.

I take no responsibility for support or misuse or misunderstanding of
how this works.  Normally anything I release publicly I tend to provide
some degree of support for; this is an exception, i.e. "this works for
me" and was thrown together one day without the usual amount of care or
caution I normally apply when writing code.

I expect people using this to take the time to figure out how it works
(it's not hard); paths/etc. should become fairly obvious once said
examination is done.

People may also need to update to mtr 0.85 to get all the benefits.

Attachments:

mtr.sh = shell script that calls mtr with specific arguments, and reads
a pseudo configuration file from stdin

config = configuration file


cronjob itself:

##
# Periodic mtrs to numerous locations.
#
# EXECUTION: Every 1 minute
#
*/1 * * * *     cd /var/log/captures && cat config | ./mtr.sh


How relevant log files are rotated, how many are kept, etc. -- done
quite simply through FreeBSD newsyslog(8).  That entry:

/var/log/captures/*.log root:staff      664  40    *    @T00  GB

-- 
| Jeremy Chadwick                                   jdc at koitsu.org |
| UNIX Systems Administrator                http://jdc.koitsu.org/ |
| Making life hard for others since 1977.             PGP 4BD6C0CB |

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#   src = should match `hostname` else line ignored
#   dst = destination (FQDN or IP)
# flags = any additional flags passed to mtr(8)
#
# src			dst			flags
# =========		=============		==========
#
my.home.comcast.box	my.vps.system
my.home.comcast.box	www.google.com
my.home.comcast.box	www.yahoo.com
my.vps.system		my.home.comcast.box

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