[Dxspider-support] crontab 'spawn' command will kick all connected users and nodes
David Spoelstra
davids at mediamachine.com
Thu Apr 8 15:42:41 CEST 2021
Saki-
You are correct! Good catch! I dug into the "spawn" code in DXCron.pm
(below) and I see that "spawn" does a "DXChannel::closeall();". I don't
know why, but Dirk must have decided it was needed.
-David, N9KT
# spawn any old job off
sub spawn
{
my $line = shift;
my $pid = fork();
if (defined $pid) {
if (!$pid) {
# in child, unset warnings, disable debugging and
general clean up from us
$^W = 0;
eval "{ package DB; sub DB {} }";
DXChannel::closeall();
for (@main::listeners) {
$_->close_server;
}
unless ($main::is_win) {
$SIG{HUP} = 'IGNORE';
$SIG{CHLD} = $SIG{TERM} = $SIG{INT} =
$SIG{__WARN__} = 'DEFAULT';
alarm(0);
}
exec "$line" or dbg("exec '$line' failed $!") if
isdbg('cron');
}
dbg("spawn of $line started") if isdbg('cron');
} else {
dbg("can't fork for $line $!") if isdbg('cron');
}
# coordinate
sleep(1);
}
On Thu, Apr 8, 2021 at 3:32 AM dd5xx--- via Dxspider-support <
dxspider-support at tobit.co.uk> wrote:
> Hi David et all,
>
> thanks for sharing your local crontab script. I have implemented my
> updates via my own bash script, independent of DXspider. I actually do the
> exact same thing, however the DXspider process doesn't get anything out of
> it except at the end when I run the load/prefix.
>
> I like to think outside the box and have also tried it via Spiders' local
> crontab as you suggested. However, while following along using 'watchdbg'
> and 'set/debug cron', I noticed that *EVERY* 'spawn' command in the crontab
> causes all connected users and nodes to be disconnected! In the watchdbg
> output window it looks like this:
>
> 06:59:01 DXCommand
> 06:59:01 DL1ABC disconnected
> 06:59:01 DXCommand
> 06:59:01 DL2ABC-5 disconnected
> 06:59:01 DXCommand
> 06:59:01 DL3ABC disconnected
> 06:59:01 DXCommand
> 06:59:35 DXCommand
> 06:59:35 DL1ABC connected from 111.222.33.44
>
> The documentation for DXspider crontab <
> http://www.dxcluster.org/main/cron.html> unfortunately does not give a
> more detailed information.
>
> [...]
> spawn(<command>) - start a <command> as a new process. This is used to do
> various batch jobs that you may wish to happen at certain times of the day
> or week that operate on your machine but don't require access to the
> real-time internals of the cluster daemon. You can execute just about any
> command you like, but be warned stdin and stdout are still connected to the
> same terminal (if any) as the cluster daemon. Any unix command and
> arguments can be used, see exec in the perl documentation.
> [...]
>
> For my needs the spawn event and the resulted disconnects for users/nodes
> is a no-go as I don't want my connected users+nodes to be disconnected. So
> I will continue to use my own external bash script for the cty.dat and
> wpxloc.raw updates as usual.
>
> ==> Nevertheless, I'm curious if this is also the case for you, that the
> currently connected users+nodes are disconnected at the spawn command ?
> Looking forward to hear some comments.
>
> I want to add that I do not use Mojo but still (consciously) running
> version 1.55
>
> 73
> Saki, DD5XX
>
>
> *Gesendet:* Donnerstag, 04. März 2021 um 04:14 Uhr
> *Von:* "David Spoelstra via Dxspider-support" <
> dxspider-support at tobit.co.uk>
> *An:* "The DXSpider Support list" <dxspider-support at tobit.co.uk>
> *Cc:* "David Spoelstra" <davids at mediamachine.com>
> *Betreff:* Re: [Dxspider-support] CTY-3105 Country Files - 03 March 2021
> OK, found the problem. I was using http vs https when I fetched the file -
> that made all the difference.
>
> If anyone wants to use my DXSpider cron, you are most welcome. Just to
> make sure everyone understands, you can put a crontab in /spider/local_cmd/
> and it will run. I put all my DXSpider stuff in there to keep everything
> dealing with DXSpider in one place.
>
> My DXSpider crontab in /spider/local_cmd/:
>
> # /spider/local_cmd/crontab
> # MAKE SURE /spider/cmd_import EXISTS!
> # min, hour, day-of-month, month, day-of-week (0=Sun)
> # TIME IS UTC!
>
> # Connect to other nodes
> * * * * * start_connect('w9pa') unless connected('w9pa')
> * * * * * start_connect('wb3ffv') unless connected('wb3ffv')
> * * * * * start_connect('ky4xx') unless connected('ky4xx')
>
> # Monday 1am local - Get latest FCC data (W1NR updates Sundays)
> 0 5 * * 1 spawn("cd /tmp && wget -Nq ftp://ftp.w1nr.net/usdbraw.gz &&
> /spider/perl/create_usdb.pl usdbraw.gz")
> 2 5 * * 1 run_cmd("load/usdb")
> 4 5 * * 1 spawn("rm /tmp/usdbraw.gz")
>
> # Friday 1am local - Get latest Keps to be ready for any contest
> 0 5 * * 5 spawn("cd /tmp && wget -Nq
> https://www.amsat.org/amsat/ftp/keps/current/nasabare.txt && /spider/perl/
> convkeps.pl -p nasabare.txt")
> 2 5 * * 5 run_cmd("load/keps")
> 4 5 * * 5 spawn("rm /tmp/nasabare.txt")
>
> # Friday 1am local - Get latest cty.dat to be ready for any contest
> 6 5 * * 5 spawn("cd /spider/data && wget -Nq
> https://www.country-files.com/cty/cty.dat")
> 8 5 * * 5 spawn("cd /spider/data && wget -Nq
> https://www.country-files.com/cty/wpxloc.raw")
> 10 5 * * 5 spawn("cd /spider/data && /spider/perl/create_prefix.pl")
> 12 5 * * 5 run_cmd("load/prefixes")
>
> # Friday 1am local - Update DXSpider to be ready for any contest
> 14 5 * * 5 spawn("cd /spider && git reset --hard && git pull")
>
> -David, N9KT
> _______________________________________________
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> Dxspider-support at tobit.co.uk
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>
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