table of contents
- bookworm 252.30-1~deb12u2
- bookworm-backports 254.16-1~bpo12+1
- testing 256.7-2
- unstable 256.7-2
COREDUMP.CONF(5) | coredump.conf | COREDUMP.CONF(5) |
NAME¶
coredump.conf, coredump.conf.d - Core dump storage configuration files
SYNOPSIS¶
DESCRIPTION¶
These files configure the behavior of systemd-coredump(8), a handler for core dumps invoked by the kernel. Whether systemd-coredump is used is determined by the kernel's kernel.core_pattern sysctl(8) setting. See systemd-coredump(8) and core(5) pages for the details.
CONFIGURATION DIRECTORIES AND PRECEDENCE¶
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.
OPTIONS¶
All options are configured in the [Coredump] section:
Storage=
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.
Note that in order to process a coredump (i.e. extract a stack trace) the core must be written to disk first. Thus, unless ProcessSizeMax= is set to 0 (see below), the core will be written to /var/lib/systemd/coredump/ either way (under a temporary filename, or even in an unlinked file), Storage= thus only controls whether to leave it there even after it was processed.
Added in version 215.
Compress=
Added in version 215.
ProcessSizeMax=
Setting Storage=none and ProcessSizeMax=0 disables all coredump handling except for a log entry.
Added in version 215.
ExternalSizeMax=, JournalSizeMax=
ExternalSizeMax=infinity sets the core size to unlimited.
Added in version 215.
MaxUse=, KeepFree=
Added in version 215.
The defaults for all values are listed as comments in the template /etc/systemd/coredump.conf file that is installed by default.
SEE ALSO¶
systemd-journald.service(8), coredumpctl(1), systemd-tmpfiles(8)
NOTES¶
- 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.
systemd 256 |