supervision - discussion about system services, daemon supervision, init, runlevel management, and tools such as s6 and runit
 help / color / mirror / Atom feed
From: Steve Litt <>
Subject: Re: S6 Queries
Date: Mon, 2 Aug 2021 16:42:01 -0400	[thread overview]
Message-ID: <20210802164201.331cafaf@mydesk.domain.cxm> (raw)
In-Reply-To: <em53404023-b5de-45d0-aad2-18dd54e8a436@elzian>

Laurent Bercot said on Mon, 02 Aug 2021 19:39:47 +0000

>>I thought the way to do what the OP asked is:
>>s6-svc -u myrequirement || exit 1
>>exec mydaemon -myarg1 -myarg2
>  This is not a good idea in a s6-rc installation, because it sends
>raw s6 commands, which may mess with the service state as viewed by
>s6-rc. Also, it sends control commands to a service from another
>service's run script, which is bad form in general: it is
>unintuitive that starting the mydaemon service also causes the
>myrequirement service to be started. Dependencies should be handled at
>the service manager level, not at the process supervision level.

Do you think this is any better?

test_for_myrequirement || exit 1
exec mydaemon -myarg1 -myarg2


Steve Litt 
Spring 2021 featured book: Troubleshooting Techniques of the Successful

  reply	other threads:[~2021-08-02 20:42 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-02  4:54 Arjun D R
2021-08-02  8:27 ` Laurent Bercot
2021-08-02 18:07   ` Steve Litt
2021-08-02 19:39     ` Laurent Bercot
2021-08-02 20:42       ` Steve Litt [this message]
2021-08-02 21:40         ` Laurent Bercot
2021-08-11 11:05   ` Arjun D R
2021-08-11 14:21     ` Laurent Bercot

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210802164201.331cafaf@mydesk.domain.cxm \ \ \
    --subject='Re: S6 Queries' \

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).