Cron-jobs cannot use systemctl --user "Failed to get D-Bus connection"

Spider.007 · 2014-09-03 13:39:54

I use https://wiki.archlinux.org/index.php/Systemd/User which works fine; but I also have a cronjob which should restart a certain (user) service. This doesn't work; the cronjob says:

Failed to get D-Bus connection: Connection refused

I have the same issue when su-ing to the user, which is why I have a suspicion this is related to https://bugzilla.redhat.com/show_bug.cgi?id=753882.

Does anyone here have this working; or possible solution?

Okay I found a workaround:

[[ -z $XDG_RUNTIME_DIR ]] && export XDG_RUNTIME_DIR=/run/user/$UID

Last edited by Spider.007 (2014-09-05 08:51:26)

vendion · 2014-09-17 10:49:36

I am having the same problem, but it affects all user services, even running "systemctl --user status" fails because it can not connect to D-Bus. Your workaround went in you're shells configuration file I assume (bashrc, zshrc, etc)?

Karamazov · 2014-12-19 13:32:15

Spider.007 wrote:

Okay I found a workaround:

[[ -z $XDG_RUNTIME_DIR ]] && export XDG_RUNTIME_DIR=/run/user/$UID

Thanks a lot

In my case, I did this :

First, I edit the sudo's configuration file, with the visudo command.

And finally :

# This is the UID of the user "pikachu" :
PIKACHU_UID=1008

sudo -u pikachu -H XDG_RUNTIME_DIR=/run/user/$PIKACHU_UID systemctl --user start something.service

rumpelsepp · 2014-12-19 16:35:13

but I also have a cronjob which should restart a certain (user) service

You could use a timer instead: https://wiki.archlinux.org/index.php/Systemd/Timers

[Unit]
Description=Do something daily

[Timer]
OnCalendar=daily
Persistent=true

[Install]
WantedBy=timer.target

[Unit]
Description=Restart service

[Service]
Type=oneshot
ExecStart=/usr/bin/systemctl try-restart my_program.service

intelfx · 2014-12-19 17:58:30

Setting XDG_RUNTIME_DIR and using sudo is hackish... Have you tried using either systemd user instance's timers or per-user cron tables?

Spider.007 · 2014-12-20 12:05:17

rumpelsepp wrote:

but I also have a cronjob which should restart a certain (user) service
You could use a timer instead: https://wiki.archlinux.org/index.php/Systemd/Timers
[...]

Thanks; that's a good suggestion. Unfortunately for me it doesn't work; the restart is part of a bigger script that should be performed after certain updates are completed

intelfx wrote:

Setting XDG_RUNTIME_DIR and using sudo is hackish... Have you tried using either systemd user instance's timers or per-user cron tables?

The whole point is systemd-user instances can only be controlled by logged in users. Not by cron-jobs that run under that users credentials....

Karamazov · 2014-12-20 13:04:46

intelfx wrote:

Have you tried using either systemd user instance's timers or per-user cron tables?

Spider.007 needs timers or cronjobs, not me

intelfx wrote:

Setting XDG_RUNTIME_DIR and using sudo is hackish.

My problem is : how does user_B to stop, reload, mask, enable … an unit which is launched by the user_A's systemd instance ?

For example : the wiki talks about a user version of the mpd service, which is launched by the systemd instance of the user "mpd". How does the user "intelfx" to stop, reload, mask, enable … this unit ?

Using sudo and XDG_RUNTIME_DIR seems to work. Does an other solution exist ?

fsckd · 2014-12-20 13:19:51

Karamazov wrote:

intelfx wrote:
Have you tried using either systemd user instance's timers or per-user cron tables?
Spider.007 needs timers or cronjobs, not me

intelfx wrote:
Setting XDG_RUNTIME_DIR and using sudo is hackish.

My problem is : how does user_B to stop, reload, mask, enable … an unit which is launched by the user_A's systemd instance ?
For example : the wiki talks about a user version of the mpd service, which is launched by the systemd instance of the user "mpd". How does the user "intelfx" to stop, reload, mask, enable … this unit ?
Using sudo and XDG_RUNTIME_DIR seems to work. Does an other solution exist ?

Please start your own thread. Forum Etiquette: Thread Hijacking. Thanks.

Arch Linux

#1 2014-09-03 13:39:54

Cron-jobs cannot use systemctl --user "Failed to get D-Bus connection"

#2 2014-09-17 10:49:36

Re: Cron-jobs cannot use systemctl --user "Failed to get D-Bus connection"

#3 2014-12-19 13:32:15

Re: Cron-jobs cannot use systemctl --user "Failed to get D-Bus connection"

#4 2014-12-19 16:35:13

Re: Cron-jobs cannot use systemctl --user "Failed to get D-Bus connection"

#5 2014-12-19 17:58:30

Re: Cron-jobs cannot use systemctl --user "Failed to get D-Bus connection"

#6 2014-12-20 12:05:17

Re: Cron-jobs cannot use systemctl --user "Failed to get D-Bus connection"

#7 2014-12-20 13:04:46

Re: Cron-jobs cannot use systemctl --user "Failed to get D-Bus connection"

#8 2014-12-20 13:19:51

Re: Cron-jobs cannot use systemctl --user "Failed to get D-Bus connection"

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