supervision - discussion about system services, daemon supervision, init, runlevel management, and tools such as s6 and runit
 help / color / mirror / Atom feed
From: "Laurent Bercot" <ska-supervision@skarnet.org>
To: "billa chaitanya" <billachaitanya@gmail.com>,
	supervision@list.skarnet.org
Subject: Re: writing s6 services
Date: Wed, 28 Oct 2020 14:01:52 +0000
Message-ID: <em0094f017-01ed-4ef8-ac43-4cf2adc58a58@elzian> (raw)
In-Reply-To: <CAH9hU4KQLq815wqpn5PCj+-+WUsGdqHmHNxP9-6PWfmuJ_ATfw@mail.gmail.com>

>1) Is there a possibility to add an ENV variable dynamically?
>I have a shell script which fills out some variables like
>IPADDRESS, SERVER  etc .. which I need to use in starting a process later
>as part of starting a service/stopping a service.

  You can do whatever you want in a run script, as long as by the end
of it, the pid of the long-running daemon is the pid your run script
was started as.
  If your run script is a shell script, you can absolutely source the
script that fills out your environment variables. It is not the most
idiomatic or safe way to do it, but it will absolutely work.


>2) Does s6-supervise has the intelligence of findingout $MAINPID as the
>systemd does?(
>https://systemd-devel.freedesktop.narkive.com/dpY7US7K/a-little-help-with-mainpid-please

  Yes, that is the point of a process supervisor.
  You don't need a variable such as $MAINPID because the supervisor 
always
remembers the pid of its child. You don't need a pidfile or anything of
the sort.

--
  Laurent


  reply	other threads:[~2020-10-28 14:01 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-28  8:01 billa chaitanya
2020-10-28 14:01 ` Laurent Bercot [this message]
2020-11-03 11:48   ` billa chaitanya
2020-11-03 16:54     ` Guillermo

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:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

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

  git send-email \
    --in-reply-to=em0094f017-01ed-4ef8-ac43-4cf2adc58a58@elzian \
    --to=ska-supervision@skarnet.org \
    --cc=billachaitanya@gmail.com \
    --cc=supervision@list.skarnet.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

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

supervision - discussion about system services, daemon supervision, init, runlevel management, and tools such as s6 and runit

This inbox may be cloned and mirrored by anyone:

	git clone --mirror http://inbox.vuxu.org/supervision

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V1 supervision supervision/ http://inbox.vuxu.org/supervision \
		subscribe@list.skarnet.org
	public-inbox-index supervision

Example config snippet for mirrors.
Newsgroup available over NNTP:
	nntp://inbox.vuxu.org/vuxu.archive.supervision.general


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git