coredump.conf, coredump.conf.d — Coredump storage configuration files
/etc/systemd/coredump.conf
/etc/systemd/coredump.conf.d/*.conf
/run/systemd/coredump.conf.d/*.conf
/usr/lib/systemd/coredump.conf.d/*.conf
These files configure the behavior of systemd-coredump(8), a handler for core dumps invoked by the kernel.
The default configuration is defined during compilation, so a
configuration file is only needed when it is necessary to deviate
from those defaults. By default, the configuration file in
/etc/systemd/ contains commented out entries
showing the defaults as a guide to the administrator. This file
can be edited to create local overrides.
When packages need to customize the configuration, they can
install configuration snippets in
/usr/lib/systemd/*.conf.d/. Files in
/etc/ are reserved for the local
administrator, who may use this logic to override the
configuration files installed by vendor packages. The main
configuration file is read before any of the configuration
directories, and has the lowest precedence; entries in a file in
any configuration directory override entries in the single
configuration file. Files in the
*.conf.d/ configuration subdirectories
are sorted by their filename in lexicographic order, regardless of
which of the subdirectories they reside in. If multiple files
specify the same option, the entry in the file with the
lexicographically latest name takes precedence. It is recommended
to prefix all filenames in those subdirectories with a two-digit
number and a dash, to simplify the ordering of the files.
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
"[Coredump]" section:
Storage=¶Controls where to store cores. One of
"none", "external",
"journal", and "both". When
"none", the coredumps will be logged but not
stored permanently. When "external" (the
default), cores will be stored in /var/lib/systemd/coredump.
When "journal", cores will be stored in
the journal and rotated following normal journal
rotation patterns. When "both", cores
will be stored in both locations.
When cores are stored in the journal, they might be compressed following journal compression settings, see journald.conf(5). When cores are stored externally, they will be compressed by default, see below.
Compress=¶Controls compression for external
storage. Takes a boolean argument, which defaults to
"yes".
ProcessSizeMax=¶The maximum size in bytes of a core which will be processed. Coredumps exceeding this size will be logged, but the backtrace will not be generated and the core will not be stored.
ExternalSizeMax=, JournalSizeMax=¶The maximum (uncompressed) size in bytes of a core to be saved.
MaxUse=, KeepFree=¶Enforce limits on the disk space taken up by
externally stored coredumps. MaxUse= makes
sure that old coredumps are removed as soon as the total disk
space taken up by coredumps grows beyond this limit (defaults
to 10% of the total disk size). KeepFree=
controls how much disk space to keep free at least (defaults
to 15% of the total disk size). Note that the disk space used
by coredumps might temporarily exceed these limits while
coredumps are processed. Note that old coredumps are also
removed based on time via
systemd-tmpfiles(8). Set
either value to 0 to turn off size-based
clean-up.