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158 lines
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ReStructuredText
158 lines
4.4 KiB
ReStructuredText
.. _mgr-administrator-guide:
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ceph-mgr administrator's guide
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==============================
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Manual setup
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------------
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Usually, you would set up a ceph-mgr daemon using a tool such
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as ceph-ansible. These instructions describe how to set up
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a ceph-mgr daemon manually.
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First, create an authentication key for your daemon::
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ceph auth get-or-create mgr.$name mon 'allow profile mgr' osd 'allow *' mds 'allow *'
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Place that key into ``mgr data`` path, which for a cluster "ceph"
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and mgr $name "foo" would be ``/var/lib/ceph/mgr/ceph-foo``.
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Start the ceph-mgr daemon::
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ceph-mgr -i $name
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Check that the mgr has come up by looking at the output
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of ``ceph status``, which should now include a mgr status line::
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mgr active: $name
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Client authentication
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---------------------
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The manager is a new daemon which requires new CephX capabilities. If you upgrade
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a cluster from an old version of Ceph, or use the default install/deploy tools,
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your admin client should get this capability automatically. If you use tooling from
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elsewhere, you may get EACCES errors when invoking certain ceph cluster commands.
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To fix that, add a "mgr allow \*" stanza to your client's cephx capabilities by
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`Modifying User Capabilities`_.
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High availability
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-----------------
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In general, you should set up a ceph-mgr on each of the hosts
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running a ceph-mon daemon to achieve the same level of availability.
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By default, whichever ceph-mgr instance comes up first will be made
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active by the monitors, and the others will be standbys. There is
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no requirement for quorum among the ceph-mgr daemons.
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If the active daemon fails to send a beacon to the monitors for
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more than ``mon mgr beacon grace`` (default 30s), then it will be replaced
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by a standby.
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If you want to pre-empt failover, you can explicitly mark a ceph-mgr
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daemon as failed using ``ceph mgr fail <mgr name>``.
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Using modules
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-------------
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Use the command ``ceph mgr module ls`` to see which modules are
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available, and which are currently enabled. Enable or disable modules
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using the commands ``ceph mgr module enable <module>`` and
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``ceph mgr module disable <module>`` respectively.
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If a module is *enabled* then the active ceph-mgr daemon will load
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and execute it. In the case of modules that provide a service,
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such as an HTTP server, the module may publish its address when it
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is loaded. To see the addresses of such modules, use the command
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``ceph mgr services``.
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Some modules may also implement a special standby mode which runs on
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standby ceph-mgr daemons as well as the active daemon. This enables
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modules that provide services to redirect their clients to the active
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daemon, if the client tries to connect to a standby.
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Consult the documentation pages for individual manager modules for more
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information about what functionality each module provides.
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Here is an example of enabling the ``dashboard`` module:
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::
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$ ceph mgr module ls
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{
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"enabled_modules": [
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"restful",
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"status"
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],
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"disabled_modules": [
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"dashboard"
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]
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}
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$ ceph mgr module enable dashboard
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$ ceph mgr module ls
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{
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"enabled_modules": [
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"restful",
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"status",
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"dashboard"
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],
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"disabled_modules": [
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]
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}
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$ ceph mgr services
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{
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"dashboard": "http://myserver.com:7789/",
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"restful": "https://myserver.com:8789/"
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}
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Calling module commands
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-----------------------
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Where a module implements command line hooks, the commands will
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be accessible as ordinary Ceph commands::
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ceph <command | help>
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If you would like to see the list of commands handled by the
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manager (where normal ``ceph help`` would show all mon and mgr commands),
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you can send a command directly to the manager daemon::
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ceph tell mgr help
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Note that it is not necessary to address a particular mgr instance,
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simply ``mgr`` will pick the current active daemon.
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Configuration
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-------------
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``mgr module path``
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:Description: Path to load modules from
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:Type: String
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:Default: ``"<library dir>/mgr"``
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``mgr data``
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:Description: Path to load daemon data (such as keyring)
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:Type: String
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:Default: ``"/var/lib/ceph/mgr/$cluster-$id"``
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``mgr tick period``
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:Description: How many seconds between mgr beacons to monitors, and other
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periodic checks.
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:Type: Integer
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:Default: ``5``
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``mon mgr beacon grace``
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:Description: How long after last beacon should a mgr be considered failed
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:Type: Integer
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:Default: ``30``
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.. _Modifying User Capabilities: ../../rados/operations/user-management/#modify-user-capabilities
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