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ceph/doc/rados/troubleshooting/log-and-debug.rst

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=======================
Logging and Debugging
=======================
Typically, when you add debugging to your Ceph configuration, you do so at
runtime. You can also add Ceph debug logging to your Ceph configuration file if
you are encountering issues when starting your cluster. You may view Ceph log
files under ``/var/log/ceph`` (the default location).
.. tip:: When debug output slows down your system, the latency can hide
race conditions.
Logging is resource intensive. If you are encountering a problem in a specific
area of your cluster, enable logging for that area of the cluster. For example,
if your OSDs are running fine, but your metadata servers are not, you should
start by enabling debug logging for the specific metadata server instance(s)
giving you trouble. Enable logging for each subsystem as needed.
.. important:: Verbose logging can generate over 1GB of data per hour. If your
OS disk reaches its capacity, the node will stop working.
If you enable or increase the rate of Ceph logging, ensure that you have
sufficient disk space on your OS disk. See `Accelerating Log Rotation`_ for
details on rotating log files. When your system is running well, remove
unnecessary debugging settings to ensure your cluster runs optimally. Logging
debug output messages is relatively slow, and a waste of resources when
operating your cluster.
See `Subsystem, Log and Debug Settings`_ for details on available settings.
Runtime
=======
If you would like to see the configuration settings at runtime, you must log
in to a host with a running daemon and execute the following::
ceph daemon {daemon-name} config show | less
For example,::
ceph daemon osd.0 config show | less
To activate Ceph's debugging output (*i.e.*, ``dout()``) at runtime, use the
``ceph tell`` command to inject arguments into the runtime configuration::
ceph tell {daemon-type}.{daemon id or *} config set {name} {value}
Replace ``{daemon-type}`` with one of ``osd``, ``mon`` or ``mds``. You may apply
the runtime setting to all daemons of a particular type with ``*``, or specify
a specific daemon's ID. For example, to increase
debug logging for a ``ceph-osd`` daemon named ``osd.0``, execute the following::
ceph tell osd.0 config set debug_osd 0/5
The ``ceph tell`` command goes through the monitors. If you cannot bind to the
monitor, you can still make the change by logging into the host of the daemon
whose configuration you'd like to change using ``ceph daemon``.
For example::
sudo ceph daemon osd.0 config set debug_osd 0/5
See `Subsystem, Log and Debug Settings`_ for details on available settings.
Boot Time
=========
To activate Ceph's debugging output (*i.e.*, ``dout()``) at boot time, you must
add settings to your Ceph configuration file. Subsystems common to each daemon
may be set under ``[global]`` in your configuration file. Subsystems for
particular daemons are set under the daemon section in your configuration file
(*e.g.*, ``[mon]``, ``[osd]``, ``[mds]``). For example
.. code-block:: ini
[global]
debug_ms = 1/5
[mon]
debug_mon = 20
debug_paxos = 1/5
debug_auth = 2
[osd]
debug_osd = 1/5
debug_filestore = 1/5
debug_journal = 1
debug_monc = 5/20
[mds]
debug_mds = 1
debug_mds_balancer = 1
See `Subsystem, Log and Debug Settings`_ for details.
Accelerating Log Rotation
=========================
If your OS disk is relatively full, you can accelerate log rotation by modifying
the Ceph log rotation file at ``/etc/logrotate.d/ceph``. Add a size setting
after the rotation frequency to accelerate log rotation (via cronjob) if your
logs exceed the size setting. For example, the default setting looks like
this::
rotate 7
weekly
compress
sharedscripts
Modify it by adding a ``size`` setting. ::
rotate 7
weekly
size 500M
compress
sharedscripts
Then, start the crontab editor for your user space. ::
crontab -e
Finally, add an entry to check the ``etc/logrotate.d/ceph`` file. ::
30 * * * * /usr/sbin/logrotate /etc/logrotate.d/ceph >/dev/null 2>&1
The preceding example checks the ``etc/logrotate.d/ceph`` file every 30 minutes.
Valgrind
========
Debugging may also require you to track down memory and threading issues.
You can run a single daemon, a type of daemon, or the whole cluster with
Valgrind. You should only use Valgrind when developing or debugging Ceph.
Valgrind is computationally expensive, and will slow down your system otherwise.
Valgrind messages are logged to ``stderr``.
Subsystem, Log and Debug Settings
=================================
In most cases, you will enable debug logging output via subsystems.
Ceph Subsystems
---------------
Each subsystem has a logging level for its output logs, and for its logs
in-memory. You may set different values for each of these subsystems by setting
a log file level and a memory level for debug logging. Ceph's logging levels
operate on a scale of ``1`` to ``20``, where ``1`` is terse and ``20`` is
verbose [#]_ . In general, the logs in-memory are not sent to the output log unless:
- a fatal signal is raised or
- an ``assert`` in source code is triggered or
- upon requested. Please consult `document on admin socket <http://docs.ceph.com/en/latest/man/8/ceph/#daemon>`_ for more details.
A debug logging setting can take a single value for the log level and the
memory level, which sets them both as the same value. For example, if you
specify ``debug ms = 5``, Ceph will treat it as a log level and a memory level
of ``5``. You may also specify them separately. The first setting is the log
level, and the second setting is the memory level. You must separate them with
a forward slash (/). For example, if you want to set the ``ms`` subsystem's
debug logging level to ``1`` and its memory level to ``5``, you would specify it
as ``debug ms = 1/5``. For example:
.. code-block:: ini
debug {subsystem} = {log-level}/{memory-level}
#for example
debug mds balancer = 1/20
The following table provides a list of Ceph subsystems and their default log and
memory levels. Once you complete your logging efforts, restore the subsystems
to their default level or to a level suitable for normal operations.
+--------------------+-----------+--------------+
| Subsystem | Log Level | Memory Level |
+====================+===========+==============+
| ``default`` | 0 | 5 |
+--------------------+-----------+--------------+
| ``lockdep`` | 0 | 1 |
+--------------------+-----------+--------------+
| ``context`` | 0 | 1 |
+--------------------+-----------+--------------+
| ``crush`` | 1 | 1 |
+--------------------+-----------+--------------+
| ``mds`` | 1 | 5 |
+--------------------+-----------+--------------+
| ``mds balancer`` | 1 | 5 |
+--------------------+-----------+--------------+
| ``mds locker`` | 1 | 5 |
+--------------------+-----------+--------------+
| ``mds log`` | 1 | 5 |
+--------------------+-----------+--------------+
| ``mds log expire`` | 1 | 5 |
+--------------------+-----------+--------------+
| ``mds migrator`` | 1 | 5 |
+--------------------+-----------+--------------+
| ``buffer`` | 0 | 1 |
+--------------------+-----------+--------------+
| ``timer`` | 0 | 1 |
+--------------------+-----------+--------------+
| ``filer`` | 0 | 1 |
+--------------------+-----------+--------------+
| ``striper`` | 0 | 1 |
+--------------------+-----------+--------------+
| ``objecter`` | 0 | 1 |
+--------------------+-----------+--------------+
| ``rados`` | 0 | 5 |
+--------------------+-----------+--------------+
| ``rbd`` | 0 | 5 |
+--------------------+-----------+--------------+
| ``rbd mirror`` | 0 | 5 |
+--------------------+-----------+--------------+
| ``rbd replay`` | 0 | 5 |
+--------------------+-----------+--------------+
| ``journaler`` | 0 | 5 |
+--------------------+-----------+--------------+
| ``objectcacher`` | 0 | 5 |
+--------------------+-----------+--------------+
| ``client`` | 0 | 5 |
+--------------------+-----------+--------------+
| ``osd`` | 1 | 5 |
+--------------------+-----------+--------------+
| ``optracker`` | 0 | 5 |
+--------------------+-----------+--------------+
| ``objclass`` | 0 | 5 |
+--------------------+-----------+--------------+
| ``filestore`` | 1 | 3 |
+--------------------+-----------+--------------+
| ``journal`` | 1 | 3 |
+--------------------+-----------+--------------+
| ``ms`` | 0 | 5 |
+--------------------+-----------+--------------+
| ``mon`` | 1 | 5 |
+--------------------+-----------+--------------+
| ``monc`` | 0 | 10 |
+--------------------+-----------+--------------+
| ``paxos`` | 1 | 5 |
+--------------------+-----------+--------------+
| ``tp`` | 0 | 5 |
+--------------------+-----------+--------------+
| ``auth`` | 1 | 5 |
+--------------------+-----------+--------------+
| ``crypto`` | 1 | 5 |
+--------------------+-----------+--------------+
| ``finisher`` | 1 | 1 |
+--------------------+-----------+--------------+
| ``reserver`` | 1 | 1 |
+--------------------+-----------+--------------+
| ``heartbeatmap`` | 1 | 5 |
+--------------------+-----------+--------------+
| ``perfcounter`` | 1 | 5 |
+--------------------+-----------+--------------+
| ``rgw`` | 1 | 5 |
+--------------------+-----------+--------------+
| ``rgw sync`` | 1 | 5 |
+--------------------+-----------+--------------+
| ``civetweb`` | 1 | 10 |
+--------------------+-----------+--------------+
| ``javaclient`` | 1 | 5 |
+--------------------+-----------+--------------+
| ``asok`` | 1 | 5 |
+--------------------+-----------+--------------+
| ``throttle`` | 1 | 1 |
+--------------------+-----------+--------------+
| ``refs`` | 0 | 0 |
+--------------------+-----------+--------------+
| ``compressor`` | 1 | 5 |
+--------------------+-----------+--------------+
| ``bluestore`` | 1 | 5 |
+--------------------+-----------+--------------+
| ``bluefs`` | 1 | 5 |
+--------------------+-----------+--------------+
| ``bdev`` | 1 | 3 |
+--------------------+-----------+--------------+
| ``kstore`` | 1 | 5 |
+--------------------+-----------+--------------+
| ``rocksdb`` | 4 | 5 |
+--------------------+-----------+--------------+
| ``leveldb`` | 4 | 5 |
+--------------------+-----------+--------------+
| ``memdb`` | 4 | 5 |
+--------------------+-----------+--------------+
| ``fuse`` | 1 | 5 |
+--------------------+-----------+--------------+
| ``mgr`` | 1 | 5 |
+--------------------+-----------+--------------+
| ``mgrc`` | 1 | 5 |
+--------------------+-----------+--------------+
| ``dpdk`` | 1 | 5 |
+--------------------+-----------+--------------+
| ``eventtrace`` | 1 | 5 |
+--------------------+-----------+--------------+
Logging Settings
----------------
Logging and debugging settings are not required in a Ceph configuration file,
but you may override default settings as needed. Ceph supports the following
settings:
.. confval:: log_file
.. confval:: log_max_new
.. confval:: log_max_recent
.. confval:: log_to_file
.. confval:: log_to_stderr
.. confval:: err_to_stderr
.. confval:: log_to_syslog
.. confval:: err_to_syslog
.. confval:: log_flush_on_exit
.. confval:: clog_to_monitors
.. confval:: clog_to_syslog
.. confval:: mon_cluster_log_to_syslog
.. confval:: mon_cluster_log_file
OSD
---
.. confval:: osd_debug_drop_ping_probability
.. confval:: osd_debug_drop_ping_duration
Filestore
---------
.. confval:: filestore_debug_omap_check
MDS
---
- :confval:`mds_debug_scatterstat`
- :confval:`mds_debug_frag`
- :confval:`mds_debug_auth_pins`
- :confval:`mds_debug_subtrees`
RADOS Gateway
-------------
- :confval:`rgw_log_nonexistent_bucket`
- :confval:`rgw_log_object_name`
- :confval:`rgw_log_object_name_utc`
- :confval:`rgw_enable_ops_log`
- :confval:`rgw_enable_usage_log`
- :confval:`rgw_usage_log_flush_threshold`
- :confval:`rgw_usage_log_tick_interval`
.. [#] there are levels >20 in some rare cases and that they are extremely verbose.
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