TMPFILES.D(5)tmpfiles.dTMPFILES.D(5)NAMEtmpfiles.d - Configuration for creation, deletion and cleaning of
volatile and temporary files
SYNOPSIS
/etc/tmpfiles.d/*.conf
/run/tmpfiles.d/*.conf
/usr/lib/tmpfiles.d/*.conf
DESCRIPTION
systemd-tmpfiles uses the configuration files from the above
directories to describe the creation, cleaning and removal of volatile
and temporary files and directories which usually reside in directories
such as /run or /tmp.
CONFIGURATION FORMAT
Each configuration file shall be named in the style of <program>.conf.
Files in /etc/ override files with the same name in /usr/lib/ and
/run/. Files in /run/ override files with the same name in /usr/lib/.
Packages should install their configuration files in /usr/lib/. Files
in /etc/ are reserved for the local administrator, who may use this
logic to override the configuration files installed by vendor packages.
All configuration files are sorted by their filename in alphabetical
order, regardless in which of the directories they reside, to guarantee
that a specific configuration file takes precedence over another file
with an alphabetically later name
If the administrator wants to disable a configuration file supplied by
the vendor the recommended way is to place a symlink to /dev/null in
/etc/tmpfiles.d/ bearing the same file name.
The configuration format is one line per path containing action, path,
mode, ownership, age and argument fields:
Type Path Mode UID GID Age Argument
d /run/user 0755 root root 10d -
L /tmp/foobar - - - - /dev/null
Type
f
Create a file if it doesn't exist yet (optionally writing a short
string into it, if the argument parameter is passed)
F
Create or truncate a file (optionally writing a short string into
it, if the argument parameter is passed)
w
Write the argument parameter to a file, if the file exists. Lines
of this type accept shell-style globs in place of normal path
names. The argument parameter will be written without a trailing
newline. C-style backslash escapes are interpreted.
d
Create a directory if it doesn't exist yet
D
Create or empty a directory
p
Create a named pipe (FIFO) if it doesn't exist yet
L
Create a symlink if it doesn't exist yet
c
Create a character device node if it doesn't exist yet
b
Create a block device node if it doesn't exist yet
x
Ignore a path during cleaning. Use this type to exclude paths from
clean-up as controlled with the Age parameter. Note that lines of
this type do not influence the effect of r or R lines. Lines of
this type accept shell-style globs in place of of normal path
names.
r
Remove a file or directory if it exists. This may not be used to
remove non-empty directories, use R for that. Lines of this type
accept shell-style globs in place of normal path names.
R
Recursively remove a path and all its subdirectories (if it is a
directory). Lines of this type accept shell-style globs in place of
normal path names.
z
Restore SELinux security context label and set ownership and access
mode of a file or directory if it exists. Lines of this type accept
shell-style globs in place of normal path names.
Z
Recursively restore SELinux security context label and set
ownership and access mode of a path and all its subdirectories (if
it is a directory). Lines of this type accept shell-style globs in
place of normal path names.
Mode
The file access mode to use when creating this file or directory. If
omitted or when set to - the default is used: 0755 for directories,
0644 for all other file objects. For z, Z lines if omitted or when set
to - the file access mode will not be modified. This parameter is
ignored for x, r, R, L lines.
UID, GID
The user and group to use for this file or directory. This may either
be a numeric user/group ID or a user or group name. If omitted or when
set to - the default 0 (root) is used. For z, Z lines when omitted or
when set to - the file ownership will not be modified. These parameters
are ignored for x, r, R, L lines.
Age
The date field, when set, is used to decide what files to delete when
cleaning. If a file or directory is older than the current time minus
the age field it is deleted. The field format is a series of integers
each followed by one of the following postfixes for the respective time
units:
s, min, h, d, w, ms, m, us
If multiple integers and units are specified the time values are summed
up.
The age field only applies to lines starting with d, D and x. If
omitted or set to - no automatic clean-up is done.
Argument
For L lines determines the destination path of the symlink. For c, b
determines the major/minor of the device node, with major and minor
formatted as integers, separated by :, e.g. "1:3". For f, F, w may be
used to specify a short string that is written to the file, suffixed by
a newline. Ignored for all other lines.
EXAMPLE
Example 1. /etc/tmpfiles.d/screen.conf example
screen needs two directories created at boot with specific modes and
ownership.
d /var/run/screens 1777 root root 10d
d /var/run/uscreens 0755 root root 10d12h
SEE ALSOsystemd(1), systemd-tmpfiles(8)AUTHOR
Brandon Philips <brandon@ifup.org>
Documentation
systemd 02/15/2013 TMPFILES.D(5)