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From: "Wayne Marshall" <wcm@guinix.com>
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Subject: Re: Daemontools run script
Date: 2 Aug 2006 09:59:01 -0700
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On Wed, 2 Aug 2006 10:07:28 +0100
"ed neville" <ed.neville@ukplc.net> wrote:

> 
> Here is an alternative vsftpd script without using tcpserver, in
> theory a little more efficient as a new cop of vsftpd is not forked
> on all connections
> 
> #!/bin/sh
> 
> exec 2>&1
> 
> PF="/var/run/vsftpd/vsftpd.pid";
> VSB="/usr/sbin/vsftpd";
> 
> while [ true ] ;
> do
>         PID=$( cat $PF );
>         CMD=$( cat /proc/$PID/cmdline 2>&1 );
>         if [ "$CMD" != "$VSB" ] ;
>         then
>                 echo "$VSB not running" ;
>                 /etc/init.d/vsftpd stop
>                 /etc/init.d/vsftpd start
>         fi ;
>         sleep 5;
> done ;
> 
> 

This script indicates some (rather massive) confusion about what it
means to run a service under supervision.  All you really want here is
this:

#!/bin/sh
exec 2>&1
exec /usr/sbin/vsftpd
#EOF

Set up your vstpd.conf file with 'background=NO' and 'listen=YES' and
no other run script gymnastics.  The service supervisor will keep track
of the PID for you, and will automatically notice if the service dies,
in which case it will try to restart it.  You will manage the service
directly with svc/sv to start/stop/restart/etc, and none of the slag
from /etc/init.d.

As for not using tcpserver/tcpsvd, that's up to you, but for an ftp
service it is probably not worth the loss of the concurrency limits
and fine-grained connection control possible with
tcprules/ipsvd-instruct (with the -x option).

A few other examples of services may be found here:

  http://thedjbway.org/services.html

Wayne