1/15/2024 0 Comments Ubuntu clean disk spaceDefaults to one eighth of the values configured with SystemMaxUse= and RuntimeMaxUse=, so that usually seven rotated journal files are kept as history. This influences the granularity in which disk space is made available through rotation, i.e. SystemMaxFileSize= and RuntimeMaxFileSize= control how large individual journal files may grow at most. This means that, in effect, there might still be more space used than SystemMaxUse= or RuntimeMaxUse= limit after a vacuuming operation is complete. Also note that only archived files are deleted to reduce the space occupied by journal files. This means that if there was enough free space before and journal files were created, and subsequently something else causes the file system to fill up, journald will stop using more space, but it will not be removing existing files to reduce the footprint again, either. If the file system is nearly full and either SystemKeepFree= or RuntimeKeepFree= are violated when systemd-journald is started, the limit will be raised to the percentage that is actually free. The first pair defaults to 10% and the second to 15% of the size of the respective file system, but each value is capped to 4G. systemd-journald will respect both limits and use the smaller of the two values. SystemKeepFree= and RuntimeKeepFree= control how much disk space systemd-journald shall leave free for other uses. SystemMaxUse= and RuntimeMaxUse= control how much disk space the journal may use up at most. Reading this was confused about SystemMaxFileSize vs SystemMaxUse options for nf. Greatest effect as it can take all log data written so far into account. The rotation has the effect that allĬurrently active files are archived (and potentially new, empty journalįiles opened as replacement), and hence the vacuuming operation has the If so, all active files are rotated first, and the requested vacuuming These three switches may also be combined with -rotate into one command. These three parameters as zero is equivalent to not enforcing the specific Number of files limit on the archived journal files. Single invocation to enforce any combination of a size, a time and a vacuum-size=, -vacuum-time= and -vacuum-files= may be combined in a Similarly, -vacuum-files= might notĪctually reduce the number of journal files to below the specified number,Īs it will not remove active journal files. Latter includes active journal files, while the vacuuming operation only Has only an indirect effect on the output shown by -disk-usage, as the "months", "weeks" and "years" suffixes), or no more than the specified The specified timespan (specified with the usual "s", "m", "h", "days", "T" suffixes), or all archived journal files contain no data older than The only safe ways of wiping data are the ATA Secure Erase command (if implemented correctly), or physical destruction. Removes the oldest archived journal files until the disk space they useįalls below the specified size (specified with the usual "K", "M", "G" and 128 Warning: Modern disk/SSD hardware and modern filesystems may squirrel away data in places where you cannot delete them, so this process may still leave data on the disk. Will delete everything but the last 10 days.įrom man journalctl: -vacuum-size=, -vacuum-time=, -vacuum-files= This will retain the most recent 100M of data. You can diminish the size of the journal by means of these commands: sudo journalctl -vacuum-size=100M
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