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Groups > linux.debian.user > #275014
| From | Michael Kjörling <c9bc136c6063@ewoof.net> |
|---|---|
| Newsgroups | linux.debian.user |
| Subject | Re: differences between sysvinit and systemd; was: where is mail.log |
| Date | 2024-11-30 14:30 +0100 |
| Message-ID | <JOvHQ-cLTQ-3@gated-at.bofh.it> (permalink) |
| References | (2 earlier) <JOfD3-czgf-15@gated-at.bofh.it> <JOgSt-cA0d-23@gated-at.bofh.it> <JOpj3-cH3B-1@gated-at.bofh.it> <JOuVr-cLnT-3@gated-at.bofh.it> <JOuVr-cLnT-1@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On 30 Nov 2024 20:33 +0800, from bitfox@secubox.org (Bitfox):
> May I ask what's the main difference between systemd and sysv for init
> system?
I think it's fair to say that systemd does a great deal more, as well
as that it brings things into the init system which have traditionally
been done by separate pieces of software.
SysV init is primarily a way to manage automated start and stop of
services at runlevel changes, by executing a series of programs placed
in magic directories (/etc/rc?.d) with specific parameters; and does
very little else. Things like recovering from service failures,
dependency management, etc. are up to those scripts (or the system
administrator).
Whereas systemd aims to be more of a system _management_ tool;
bringing in system log storage, time synchronization, file system and
service dependency management, on-demand service startup, network
management, and a great deal more.
A lot of people have very strong opinions about this.
_From a user perspective_, there's actually not all that much
difference: to get to a usable, running system, both systemd and
sysvinit must accomplish roughly the same things and start the same
services; and to interrogate the state of the running system, the
administrator must do roughly the same things. The difference here is
in _how_ this is accomplished and exactly which software is used for
each part of it. Compatibility shims have also existed for a long
time, and nothing really prevents for example a distribution from
packaging /etc/init.d/* scripts which are wrappers around the
corresponding systemctl commands on a systemd system.
For example, whereas on a more traditional sysvinit system using
traditional text-based log files, you might use something like
# awk '{ if($5 ~ "^postfix[[]") { print } }' </var/log/messages
on a systemd system you'd use, to roughly the same effect
# journalctl --no-pager --all -u postfix
(where -u xx can alternatively be written --unit=xx)
and to restart a service, instead of SysV init's
# /etc/init.d/postfix restart
one might do
# systemctl restart postfix
--
Michael Kjörling
🔗 https://michael.kjorling.se
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where is mail.log Bitfox <hi@bitfox.ddns.net> - 2024-11-29 01:10 +0100
Re: where is mail.log Greg Wooledge <greg@wooledge.org> - 2024-11-29 01:20 +0100
Re: where is mail.log "Roy J. Tellason, Sr." <roy@rtellason.com> - 2024-11-29 21:20 +0100
Re: where is mail.log Greg Wooledge <greg@wooledge.org> - 2024-11-29 21:30 +0100
Re: where is mail.log gene heskett <gheskett@shentel.net> - 2024-11-29 22:30 +0100
Re: where is mail.log Nicolas George <george@nsup.org> - 2024-11-30 14:40 +0100
Re: where is mail.log "Roy J. Tellason, Sr." <roy@rtellason.com> - 2024-11-30 23:30 +0100
Re: where is mail.log Max Nikulin <manikulin@gmail.com> - 2024-12-03 04:10 +0100
Re: where is mail.log Greg Wooledge <greg@wooledge.org> - 2024-12-03 04:20 +0100
Re: where is mail.log "Jonathan Dowland" <jmtd@debian.org> - 2024-12-03 10:30 +0100
Re: where is mail.log Andy Smith <andy@strugglers.net> - 2024-11-29 21:50 +0100
Re: where is mail.log pocket@homemail.com - 2024-11-29 22:40 +0100
Re: where is mail.log <tomas@tuxteam.de> - 2024-11-30 07:40 +0100
Re: where is mail.log Bitfox <bitfox@secubox.org> - 2024-11-30 13:40 +0100
Re: where is mail.log Scott Andrews <pocket@homemail.com> - 2024-11-30 14:00 +0100
Re: where is mail.log Richard Owlett <rowlett@access.net> - 2024-11-30 15:10 +0100
Re: where is mail.log <tomas@tuxteam.de> - 2024-11-30 14:30 +0100
Re: differences between sysvinit and systemd; was: where is mail.log Michael Kjörling <c9bc136c6063@ewoof.net> - 2024-11-30 14:30 +0100
Re: differences between sysvinit and systemd; was: where is mail.log Greg Wooledge <greg@wooledge.org> - 2024-11-30 15:10 +0100
Re: differences between sysvinit and systemd Michael Kjörling <c9bc136c6063@ewoof.net> - 2024-11-30 16:50 +0100
Re: where is mail.log Nicolas George <george@nsup.org> - 2024-11-30 14:50 +0100
Re: where is mail.log pocket@homemail.com - 2024-11-30 13:40 +0100
Re: where is mail.log Andy Smith <andy@strugglers.net> - 2024-11-30 18:00 +0100
Re: where is mail.log Scott Andrews <pocket@homemail.com> - 2024-11-30 18:40 +0100
Re: where is mail.log <tomas@tuxteam.de> - 2024-11-30 19:00 +0100
Re: where is mail.log pocket@homemail.com - 2024-11-30 19:20 +0100
Re: where is mail.log Andy Smith <andy@strugglers.net> - 2024-11-30 19:30 +0100
Re: where is mail.log <tomas@tuxteam.de> - 2024-11-30 19:30 +0100
Re: where is mail.log Greg Wooledge <greg@wooledge.org> - 2024-11-30 19:40 +0100
Re: where is mail.log Andy Smith <andy@strugglers.net> - 2024-11-30 20:00 +0100
Re: where is mail.log <tomas@tuxteam.de> - 2024-11-30 20:20 +0100
Re: where is mail.log and the changing Linux ecosystem George at Clug <Clug@goproject.info> - 2024-12-01 01:10 +0100
Re: where is mail.log and the changing Linux ecosystem Greg Wooledge <greg@wooledge.org> - 2024-12-01 01:20 +0100
Re: where is mail.log and the changing Linux ecosystem George at Clug <Clug@goproject.info> - 2024-12-01 01:30 +0100
Re: where is mail.log and the changing Linux ecosystem <tomas@tuxteam.de> - 2024-12-01 07:20 +0100
Re: where is mail.log Jeffrey Walton <noloader@gmail.com> - 2024-12-02 17:30 +0100
Re: where is mail.log Scott Andrews <pocket@homemail.com> - 2024-11-30 20:00 +0100
Re: where is mail.log Andy Smith <andy@strugglers.net> - 2024-11-30 19:10 +0100
Re: where is mail.log Anssi Saari <anssi.saari@debian-user.mail.kapsi.fi> - 2024-12-02 13:10 +0100
Re: where is mail.log Dan Ritter <dsr@randomstring.org> - 2024-11-29 01:40 +0100
Re: where is mail.log Greg Wooledge <greg@wooledge.org> - 2024-11-29 03:10 +0100
Re: where is mail.log Bitfox <hi@bitfox.ddns.net> - 2024-11-29 05:10 +0100
Re: where is mail.log Bitfox <hi@bitfox.ddns.net> - 2024-11-29 11:40 +0100
Re: where is mail.log George at Clug <Clug@goproject.info> - 2024-11-30 13:30 +0100
Re: where is mail.log George at Clug <Clug@goproject.info> - 2024-11-29 03:50 +0100
Re: where is mail.log Michael <ml@hemathor.de> - 2024-12-02 12:50 +0100
Re: where is mail.log Nicolas George <george@nsup.org> - 2024-12-02 13:10 +0100
Re: where is mail.log Andy Smith <andy@strugglers.net> - 2024-12-02 16:10 +0100
Re: where is mail.log Michael <ml@hemathor.de> - 2024-12-03 11:20 +0100
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