XPost: uk.comp.os.linux   
   From: dan@djph.net   
      
   On 2025-09-10, Theo wrote:   
   > In uk.comp.os.linux Dan Purgert  wrote:   
   >> On 2025-09-10, Mike Scott wrote:   
   >> > On 10/09/2025 09:42, Dan Purgert wrote:   
   >> >> On 2025-09-10, Mike Scott wrote:   
   >> >>> On 04/09/2025 08:26, Richard Kettlewell wrote:   
   >> >>>> Mike Scott> >>> ottsonline.org.uk.invalid> writes:   
   >> >>>>> I've been using a program 'daemon' on freebsd   
   >> >>>>> (eg   
   >> >>>>> man.freebsd.org/cgi/man.cgi?query=daemon&sektion=8&manp   
   th=FreeBSD+14.3-RELEASE+and+Ports)   
   >> >>>>>   
   >> >>>>> which will run arbitrary programs as daemons, handling all the   
   >> >>>>> necessary "house-keeping" for them.   
   >> >>>>>   
   >> >>>>> I can't find a ready-to-roll linux version - is there one please?   
   >> >>>> If you want an (almost) identical interface then in Debian (and   
   >> >>>> presumably therefore also Ubuntu), there’s a command of the same name   
   >> >>>> and similar behavior:   
   >> >>>>   
   >> >>>> https://manpages.debian.org/trixie/daemon/daemon.1.en.html   
   >> >>>   
   >> >>> Sorry, back again.   
   >> >>>   
   >> >>> I've been playing with this and there seems to be an important feature   
   >> >>> missing on linux that's in the BSD version: how to do logfile rotation?   
   >> >>> [...]   
   >> >>> Have I missed something?   
   >> >>   
   >> >> logrotate(8) ?   
   >> >>   
   >> >>   
   >> > Thanks for the reply, but no. That assumes the existence of the   
   >> > mechanism missing AFAICS from this daemon.   
   >>   
   >> I'm not sure what you mean here.  "Logrotate" is a tool that exists.   
   >>   
   >> Granted, the systems here have been getting in-place upgrades for the   
   >> last decade; maybe logrotate has since been replaced in 'clean' installs   
   >> (or it's not a default part of the installation and I've just completely   
   >> forgotten that).   
   >   
   > It sounds like the problem is that 'daemon' is never closing the output   
   > file, so 'logrotate' is never able to process it.  The -H flag is supposed   
   > to tell daemon to close the file on SIGHUP so logrotate can swap it   
   > out, but it doesn't exist in the Debian version.   
      
   Oh, then you add 'copytruncate' to the rotate directives, and the   
   original log gets zeroed out when logrotate runs.   
      
      
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