[systemd-devel] PrivateDevices=true blocks use of ttys?

Alison Chaiken alison at she-devel.com
Fri Dec 26 13:37:58 PST 2014

On Fedora 21, I created a unit file in which I included
'PrivateDevices=true'.    When I attempt to start the unit from the text
console, the unit fails, and 'systemctl status -l' reports:

startx[2754]: (EE) xf86OpenConsole: Cannot open /dev/tty0 (No such file or

When I take 'PrivateDevices=true' out of the unit file, it works fine.
The man page for systemd.exec reads

Takes a boolean argument. If true, sets up a new /dev namespace for the
executed processes and only adds API pseudo devices such as /dev/null,
/dev/zero or /dev/random (as well as the pseudo TTY subsystem) to it, but
no physical devices such as /dev/sda.

Isn't /dev/tty0 a pseudo TTY?   Shouldn't a service that has
'PrivateDevices=true' be able to access /dev/tty0?   I'm willing to
investigate further to see if there's a bug, but want to make sure that I
understand the expected behavior first

Best wishes,

Alison Chaiken                           alison at she-devel.com
650-279-5600                            http://{she-devel.com,
Never underestimate the cleverness of advertisers, or mischief makers, or
criminals.  -- Don Norman
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