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 lexicographic
order, regardless in which of the directories they reside. If multiple
files specify the same path, the entry in the file with the
lexicographically earliest name will be applied, all all other
conflicting entries logged as errors.
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 filename.
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 does not 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 does not exist yet
D
Create or empty a directory
p
Create a named pipe (FIFO) if it does not exist yet
L
Create a symlink if it does not exist yet
c
Create a character device node if it does not exist yet
b
Create a block device node if it does not exist yet
m
If the specified file path exists adjust its access mode, group and
user to the specified values and reset the SELinux label. If it
doesn't exist do nothing.
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 normal path names.
X
Ignore a path during cleanup. Use this type to prevent path removal
as controlled with the Age parameter. Note that if path is a
directory, content of a directory is not excluded from clean-up,
only directory itself. Lines of this type accept shell-style globs
in place 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. If an integer is given without a unit, s is assumed.
When the age is set to zero, the files are cleaned unconditionally.
The age field only applies to lines starting with d, D and x. If
omitted or set to -, no automatic clean-up is done.
If the age field starts with a tilde character (~), the clean-up is
only applied to files and directories one level inside the directory
specified, but not the files and directories immediately inside it.
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
Example 2. /etc/tmpfiles.d/abrt.conf example
abrt needs a directory created at boot with specific mode and ownership
and its content should be preserved.
d /var/tmp/abrt 0755 abrt abrt
x /var/tmp/abrt/*
SEE ALSOsystemd(1), systemd-tmpfiles(8), systemd-delta(1)systemd 207TMPFILES.D(5)
