Configuring logging at runtime

Configure the logging of Ceph subsystems at system runtime to help troubleshoot any issues that might occur.

Before you begin

Before you begin, make sure that you have the following prerequisites in place:
  • A running IBM Storage Ceph cluster.
  • Access to Ceph debugger.

About this task

For more information, see:

Procedure

Activate the Ceph debugging output dout(), at runtime.
ceph tell TYPE.ID injectargs --debug-SUBSYSTEM VALUE [--NAME VALUE]
Replace as follows:
  • TYPE with the type of Ceph daemons (osd, mon, or mds).
  • ID with a specific ID of the Ceph daemon. Alternatively, use * to apply the runtime setting to all daemons of a particular type.
  • SUBSYSTEM with a specific subsystem.
  • VALUE with a number from 1 to 20, where 1 is terse and 20 is verbose.
The following example shows setting the log level for the OSD subsystem on the OSD name osd.0 to 0 and the memory level to 5.
# ceph tell osd.0 injectargs --debug-osd 0/5

Seeing the configuration settings at runtime

Procedure

  1. Log in to the host with a running Ceph daemon.
    For example, ceph-osd or ceph-mon.
  2. Display the configuration.
    ceph daemon NAME config show | less
    For example,
    [ceph: root@host01 /]# ceph daemon osd.0 config show | less