This document is for a development version of Ceph.

Crash Module

The crash module collects information about daemon crashdumps and stores it in the Ceph cluster for later analysis.


The crash module is enabled with:

ceph mgr module enable crash

The crash upload key is generated with:

ceph auth get-or-create client.crash mon 'profile crash' mgr 'profile crash'

On each node, you should store this key in /etc/ceph/ceph.client.crash.keyring.

Automated collection

Daemon crashdumps are dumped in /var/lib/ceph/crash by default; this can be configured with the option ‘crash dir’. Crash directories are named by time and date and a randomly-generated UUID, and contain a metadata file ‘meta’ and a recent log file, with a “crash_id” that is the same.

These crashes can be automatically submitted and persisted in the monitors’ storage by using ceph-crash.service. It watches the crashdump directory and uploads them with ceph crash post.

ceph-crash tries some authentication names: client.crash.$hostname, client.crash and client.admin. In order to successfully upload with ceph crash post, these need the suitable permissions: mon profile crash and mgr profile crash and a keyring needs to be in /etc/ceph.


ceph crash post -i <metafile>

Save a crash dump. The metadata file is a JSON blob stored in the crash dir as meta. As usual, the ceph command can be invoked with -i -, and will read from stdin.

ceph crash rm <crashid>

Remove a specific crash dump.

ceph crash ls

List the timestamp/uuid crashids for all new and archived crash info.

ceph crash ls-new

List the timestamp/uuid crashids for all newcrash info.

ceph crash stat

Show a summary of saved crash info grouped by age.

ceph crash info <crashid>

Show all details of a saved crash.

ceph crash prune <keep>

Remove saved crashes older than ‘keep’ days. <keep> must be an integer.

ceph crash archive <crashid>

Archive a crash report so that it is no longer considered for the RECENT_CRASH health check and does not appear in the crash ls-new output (it will still appear in the crash ls output).

ceph crash archive-all

Archive all new crash reports.


  • mgr/crash/warn_recent_interval [default: 2 weeks] controls what constitutes “recent” for the purposes of raising the RECENT_CRASH health warning.

  • mgr/crash/retain_interval [default: 1 year] controls how long crash reports are retained by the cluster before they are automatically purged.

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