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docs/doc/source/system_configuration/kubernetes/change-the-default-coredump-configuration-51ff4ce0c9ae.rst
Ron Stone acfc6ca32a Configurable coredump size parameters and storage 
Add section on configuring core dumps.
Update sections on resizing file systems to cover log FS.
Address patchset 1 review comments.

Signed-off-by: Ron Stone <ronald.stone@windriver.com>
Change-Id: If79f6f08dd50a07a42b70ca7ad1297296eabe50d
2022-06-21 15:45:12 +00:00

2.9 KiB
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Change the Default Coredump Configuration

You can change the default core dump configuration used to create core files. These are images of the system's working memory used to debug crashes or abnormal exits.

The editable parameters and their defaults are as follows:

ProcessSizeMax

The maximum size of cores that will be processed.

Default: 2G

Minimum: 0

ExternalSizeMax

The maximum size of cores to be saved.

Default: 2G

Minimum: 0

MaxUse

Sets a maximum diskspace usage by cores.

Default: unset

KeepFree

Sets the minimum amount of disk space to keep free when saving cores.

Default: 1G

Minimum: 1G

Maximum values for each configurable coredump parameter depend on system capacity.

The parameters accept integer/float values followed by a letter representing the unit of measurement.

  • B = Bytes
  • K = Kilobytes
  • M = Megabytes
  • G = Gigabytes
  • T = Terabytes
  • P = Petabytes
  • E = Exabytes

The value 0 (zero) is accepted by parameters ProcessSizeMax, ExternalSizeMax and MaxUse.

Note

Other, non-configurable, parameters are:

  • Storage = external
  • Compress = yes
  • JournalSizeMax = 767M

For more information on these values, see https://man7.org/linux/man-pages/man5/coredump.conf.5.html

Ensure that you have sufficient storage available on the host's log filesystem. See resizing-filesystems-on-a-host for more information about adjusting it's size.

When you configure a parameter, it will be replicated to the coredump.conf file of all existing nodes (controllers, workers, storages).

  • To add a coredump service parameter:

    ~(keystone_admin)]$ system service-parameter-add platform coredump <parameter>=<value>

  • To modify an existing coredump service parameter:

    ~(keystone_admin)]$ system service-parameter-modify platform coredump <parameter>=<value>

  • To delete an existing coredump service parameter:

    ~(keystone_admin)]$ system service-parameter-delete <uuid>

    Note

    When a parameter is deleted, its value will reset to the default.

Where <parameter> can be one of:

  • process_size_max
  • external_size_max
  • max_use
  • keep_free

The following example sets ExternalSizeMax to 3 gigabytes.

~(keystone_admin)]$ system service-parameter-add platform coredump external_size_max=3G

Note

Configuring a parameter raises the 250.001 controller-0 Configuration is out-of-date adarm. A lock/unlock is required to clear it. For more information, see locking-a-host-using-the-cli and unlocking-a-host-using-the-cli.