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213 lines
6.6 KiB
ReStructuredText
213 lines
6.6 KiB
ReStructuredText
======================
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Monitoring a Cluster
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======================
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Once you have a running cluster, you may use the ``ceph`` tool to monitor your
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cluster. Monitoring a cluster typically involves checking OSD status, monitor
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status, placement group status and metadata server status.
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Interactive Mode
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================
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To run the ``ceph`` tool in interactive mode, type ``ceph`` at the command line
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with no arguments. For example::
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ceph
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ceph> health
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ceph> status
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ceph> quorum_status
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ceph> mon_status
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Checking Cluster Health
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=======================
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After you start your cluster, and before you start reading and/or
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writing data, check your cluster's health first. You can check on the
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health of your Ceph cluster with the following::
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ceph health
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If you specified non-default locations for your configuration or keyring,
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you may specify their locations::
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ceph -c /path/to/conf -k /path/to/keyring health
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Upon starting the Ceph cluster, you will likely encounter a health
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warning such as ``HEALTH_WARN XXX num placement groups stale``. Wait a few moments and check
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it again. When your cluster is ready, ``ceph health`` should return a message
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such as ``HEALTH_OK``. At that point, it is okay to begin using the cluster.
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Watching a Cluster
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==================
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To watch the cluster's ongoing events, open a new terminal. Then, enter::
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ceph -w
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Ceph will print each version of the placement group map and their status. For
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example, a tiny Ceph cluster consisting of one monitor, one metadata server and
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two OSDs may print the following::
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health HEALTH_OK
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monmap e1: 1 mons at {a=192.168.0.1:6789/0}, election epoch 0, quorum 0 a
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osdmap e13: 2 osds: 2 up, 2 in
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placement groupmap v9713: 384 placement groups: 384 active+clean; 8730 bytes data, 22948 MB used, 264 GB / 302 GB avail
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mdsmap e4: 1/1/1 up {0=a=up:active}
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2012-08-01 11:33:53.831268 mon.0 [INF] placement groupmap v9712: 384 placement groups: 384 active+clean; 8730 bytes data, 22948 MB used, 264 GB / 302 GB avail
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2012-08-01 11:35:31.904650 mon.0 [INF] placement groupmap v9713: 384 placement groups: 384 active+clean; 8730 bytes data, 22948 MB used, 264 GB / 302 GB avail
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2012-08-01 11:35:53.903189 mon.0 [INF] placement groupmap v9714: 384 placement groups: 384 active+clean; 8730 bytes data, 22948 MB used, 264 GB / 302 GB avail
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2012-08-01 11:37:31.865809 mon.0 [INF] placement groupmap v9715: 384 placement groups: 384 active+clean; 8730 bytes data, 22948 MB used, 264 GB / 302 GB avail
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Checking a Cluster's Status
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===========================
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To check a cluster's status, execute the following::
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ceph status
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Or::
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ceph -s
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In interactive mode, type ``status`` and press **Enter**. ::
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ceph> status
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Ceph will print the cluster status. For example, a tiny Ceph cluster consisting
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of one monitor, one metadata server and two OSDs may print the following::
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health HEALTH_OK
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monmap e1: 1 mons at {a=192.168.0.1:6789/0}, election epoch 0, quorum 0 a
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osdmap e13: 2 osds: 2 up, 2 in
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placement groupmap v9754: 384 placement groups: 384 active+clean; 8730 bytes data, 22948 MB used, 264 GB / 302 GB avail
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mdsmap e4: 1/1/1 up {0=a=up:active}
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Checking OSD Status
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===================
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You can check OSDs to ensure they are ``up`` and ``in`` by executing::
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ceph osd stat
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Or::
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ceph osd dump
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You can also check view OSDs according to their position in the CRUSH map. ::
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ceph osd tree
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Ceph will print out a CRUSH tree with a host, its OSDs, whether they are up
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and their weight. ::
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# id weight type name up/down reweight
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-1 3 pool default
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-3 3 rack mainrack
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-2 3 host osd-host
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0 1 osd.0 up 1
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1 1 osd.1 up 1
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2 1 osd.2 up 1
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For a detailed discussion, refer to `Monitoring OSDs and Placement Groups`_.
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Checking Monitor Status
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=======================
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If your cluster has multiple monitors (likely), you should check the monitor
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quorum status after you start the cluster before reading and/or writing data. A
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quorum must be present when multiple monitors are running. You should also check
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monitor status periodically to ensure that they are running.
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To see display the monitor map, execute the following::
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ceph mon stat
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Or::
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ceph mon dump
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To check the quorum status for the monitor cluster, execute the following::
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ceph quorum_status
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Ceph will return the quorum status. For example, a Ceph cluster consisting of
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three monitors may return the following:
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.. code-block:: javascript
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{ "election_epoch": 10,
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"quorum": [
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0,
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1,
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2],
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"monmap": { "epoch": 1,
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"fsid": "444b489c-4f16-4b75-83f0-cb8097468898",
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"modified": "2011-12-12 13:28:27.505520",
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"created": "2011-12-12 13:28:27.505520",
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"mons": [
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{ "rank": 0,
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"name": "a",
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"addr": "127.0.0.1:6789\/0"},
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{ "rank": 1,
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"name": "b",
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"addr": "127.0.0.1:6790\/0"},
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{ "rank": 2,
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"name": "c",
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"addr": "127.0.0.1:6791\/0"}
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]
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}
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}
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Checking MDS Status
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===================
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Metadata servers provide metadata services for Ceph FS. Metadata servers have
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two sets of states: ``up | down`` and ``active | inactive``. To ensure your
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metadata servers are ``up`` and ``active``, execute the following::
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ceph mds stat
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To display details of the metadata cluster, execute the following::
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ceph mds dump
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Checking Placement Group States
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===============================
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Placement groups map objects to OSDs. When you monitor your
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placement groups, you will want them to be ``active`` and ``clean``.
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For a detailed discussion, refer to `Monitoring OSDs and Placement Groups`_.
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.. _Monitoring OSDs and Placement Groups: ../monitoring-osd-pg
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Using the Admin Socket
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======================
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The Ceph admin socket allows you to query a daemon via a socket interface.
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By default, Ceph sockets reside under ``/var/run/ceph``. To access a daemon
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via the admin socket, login to the host running the daemon and use the
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following command::
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ceph --admin-daemon /var/run/ceph/{socket-name}
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To view the available admin socket commands, execute the following command::
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ceph --admin-daemon /var/run/ceph/{socket-name} help
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The admin socket command enables you to show and set your configuration at
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runtime. See `Viewing a Configuration at Runtime`_ for details.
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Additionally, you can set configuration values at runtime directly (i.e., the
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admin socket bypasses the monitor, unlike ``ceph {daemon-type} tell {id}
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injectargs``, which relies on the monitor but doesn't require you to login
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directly to the host in question ).
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.. _Viewing a Configuration at Runtime: ../../configuration/ceph-conf#ceph-runtime-config
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