journal-remote.conf, journal-remote.conf.d — Configuration files for the service accepting remote journal uploads
| /etc/systemd/journal-remote.conf | 
| /run/systemd/journal-remote.conf | 
| /usr/local/lib/systemd/journal-remote.conf | 
| /usr/lib/systemd/journal-remote.conf | 
| /etc/systemd/journal-remote.conf.d/*.conf | 
| /run/systemd/journal-remote.conf.d/*.conf | 
| /usr/local/lib/systemd/journal-remote.conf.d/*.conf | 
| /usr/lib/systemd/journal-remote.conf.d/*.conf | 
These files configure various parameters of systemd-journal-remote.service(8). See systemd.syntax(7) for a general description of the syntax.
The default configuration is set during compilation, so configuration is only needed when it is
    necessary to deviate from those defaults. The main configuration file is loaded from one of the
    listed directories in order of priority, only the first file found is used:
    /etc/systemd/,
    /run/systemd/,
    /usr/local/lib/systemd/ [1],
    /usr/lib/systemd/.
    The vendor version of the file contains commented out entries showing the defaults as a guide to the
    administrator. Local overrides can also be created by creating drop-ins, as described below. The main
    configuration file can also be edited for this purpose (or a copy in /etc/ if it's
    shipped under /usr/), however using drop-ins for local configuration is recommended
    over modifications to the main configuration file.
In addition to the main configuration file, drop-in configuration snippets are read from
    /usr/lib/systemd/*.conf.d/, /usr/local/lib/systemd/*.conf.d/,
    and /etc/systemd/*.conf.d/. Those drop-ins have higher precedence and override the
    main configuration file. Files in the *.conf.d/ configuration subdirectories are
    sorted by their filename in lexicographic order, regardless of in which of the subdirectories they
    reside. When multiple files specify the same option, for options which accept just a single value, the
    entry in the file sorted last takes precedence, and for options which accept a list of values, entries
    are collected as they occur in the sorted files.
When packages need to customize the configuration, they can install drop-ins under
    /usr/. Files in /etc/ are reserved for the local administrator,
    who may use this logic to override the configuration files installed by vendor packages. Drop-ins have to
    be used to override package drop-ins, since the main configuration file has lower precedence. It is
    recommended to prefix all filenames in those subdirectories with a two-digit number and a dash, to
    simplify the ordering. This also defines a concept of drop-in priorities to allow OS vendors to ship
    drop-ins within a specific range lower than the range used by users. This should lower the risk of
    package drop-ins overriding accidentally drop-ins defined by users. It is recommended to use the range
    10-40 for drop-ins in /usr/ and the range 60-90 for drop-ins in
    /etc/ and /run/, to make sure that local and transient drop-ins
    take priority over drop-ins shipped by the OS vendor.
To disable a configuration file supplied by the vendor, the recommended way is to place a symlink
    to /dev/null in the configuration directory in /etc/, with the
    same filename as the vendor configuration file.
All options are configured in the [Remote] section:
Seal=¶Periodically sign the data in the journal using Forward Secure Sealing.
SplitMode=¶One of "host" or "none".
        
ServerKeyFile=¶SSL key in PEM format.
ServerCertificateFile=¶SSL certificate in PEM format.
TrustedCertificateFile=¶SSL CA certificate.
MaxUse=, KeepFree=, MaxFileSize=, MaxFiles=¶These are analogous to SystemMaxUse=,
        SystemKeepFree=, SystemMaxFileSize=
        and SystemMaxFiles= in
        journald.conf(5).
MaxUse= controls how much disk space
        the systemd-journal-remote may use up at most.
        KeepFree= controls how much disk
        space systemd-journal-remote shall leave free for other uses.
        systemd-journal-remote will respect both limits
        and use the smaller of the two values.
MaxFiles= controls how many
        individual journal files to keep at most. Note that only
        archived files are deleted to reduce the number of files until
        this limit is reached; active files will stay around. This
        means that, in effect, there might still be more journal files
        around in total than this limit after a vacuuming operation is
        complete.
journald.conf(5), systemd(1), systemd-journal-remote.service(8), systemd-journald.service(8)
[1] 💣💥🧨💥💥💣 Please note that those configuration files must be available at all times. If
      /usr/local/ is a separate partition, it may not be available during early boot,
      and must not be used for configuration.