systemd Documentation Brandon Philips brandon@ifup.org tmpfiles.d 5 tmpfiles.d Configuration for creation, deletion and cleaning of volatile and temporary files /usr/lib/tmpfiles.d/*.conf /etc/tmpfiles.d/*.conf /run/tmpfiles.d/*.conf 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. Each configuration file is named in the style of <program>.conf. Files in /etc/ overwrite files with the same name in /usr/lib/. Files in /run overwrite files with the same name in /etc/ and /usr/lib/. Packages should install their configuration files in /usr/lib/, files in /etc/ are reserved for the local administration, which possibly decides to overwrite the configurations installed from packages. All files are sorted by filename in alphabetical order, regardless in which of the directories they reside, to ensure that a specific configuration file takes precedence over another file with an alphabetically later name. The configuration format is one line per path containing action, mode, ownership and age fields: Type Path Mode UID GID Age d /run/user 0755 root root 10d f Create a file if it doesn't exist yet F Create or truncate a file 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 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 Set ownership, access mode and relabel security context of a file or directory if it exists. Lines of this type accept shell-style globs in place of normal path names. Z Recursively set ownership, access mode and relabel security context 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. 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 files. 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 lines. 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 lines. 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. 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 systemd1, systemd-tmpfiles8