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156 lines
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156 lines
4.8 KiB
ReStructuredText
=============================
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Deploying with ``mkcephfs``
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=============================
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The ``mkcephfs`` tool is the old method of deploying new Ceph
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clusters. It is now deprecated in favor of ``ceph-deploy``, which has
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better support for modifying an existing cluster.
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Enable Login to Cluster Hosts as ``root``
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=========================================
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To deploy with ``mkcephfs``, you will need to be able to login as ``root``
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on each host without a password. For each host, perform the following::
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sudo passwd root
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Enter a password for the root user.
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On the admin host, generate an ``ssh`` key without specifying a passphrase
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and use the default locations. ::
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sudo -i
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ssh-keygen
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Generating public/private key pair.
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Enter file in which to save the key (/root/.ssh/id_rsa):
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Enter passphrase (empty for no passphrase):
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Enter same passphrase again:
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Your identification has been saved in /root/.ssh/id_rsa.
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Your public key has been saved in /root/.ssh/id_rsa.pub.
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Modify your ``/root/.ssh/config`` file to login as ``root``, as follows::
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Host myserver01
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Hostname myserver01.fully-qualified-domain.com
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User root
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Host myserver02
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Hostname myserver02.fully-qualified-domain.com
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User root
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You may use RSA or DSA keys. Once you generate your keys, copy them to each
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OSD host. For example::
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ssh-copy-id root@myserver01
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ssh-copy-id root@myserver02
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Copy Configuration File to All Hosts
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====================================
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Ceph's ``mkcephfs`` deployment script does not copy the configuration file you
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created from the Administration host to the OSD Cluster hosts. Copy the
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configuration file you created (*i.e.,* ``mycluster.conf`` in the example below)
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from the Administration host to ``etc/ceph/ceph.conf`` on each OSD Cluster host
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if you are using ``mkcephfs`` to deploy Ceph.
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::
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sudo ssh myserver01 tee /etc/ceph/ceph.conf < /etc/ceph/ceph.conf
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sudo ssh myserver02 tee /etc/ceph/ceph.conf < /etc/ceph/ceph.conf
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sudo ssh myserver03 tee /etc/ceph/ceph.conf < /etc/ceph/ceph.conf
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Create the Default Directories
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==============================
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The ``mkcephfs`` deployment script does not create the default server
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directories. Create server directories for each instance of a Ceph daemon (if
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you haven't done so already). The ``host`` variables in the ``ceph.conf`` file
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determine which host runs each instance of a Ceph daemon. Using the exemplary
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``ceph.conf`` file, you would perform the following:
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On ``myserver01``::
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sudo mkdir /var/lib/ceph/osd/ceph-0
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sudo mkdir /var/lib/ceph/mon/ceph-a
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On ``myserver02``::
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sudo mkdir /var/lib/ceph/osd/ceph-1
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sudo mkdir /var/lib/ceph/mon/ceph-b
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On ``myserver03``::
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sudo mkdir /var/lib/ceph/osd/ceph-2
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sudo mkdir /var/lib/ceph/mon/ceph-c
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sudo mkdir /var/lib/ceph/mds/ceph-a
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Mount Disks to the Data Directories
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===================================
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If you are running multiple OSDs per host and one hard disk per OSD, you should
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mount the disk under the OSD data directory (if you haven't done so already).
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When mounting disks in this manner, there is no need for an entry in
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``/etc/fstab``.
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.. versionadded:: 0.56
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For Bobtail (v 0.56) and beyond, you may specify the file system type, filesystem
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options, and mount options. Add the following to the ``[global]`` section of your
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Ceph configuration file, and replace the values in braces with appropriate values::
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osd mkfs type = {fs-type}
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osd mkfs options {fs-type} = {mkfs options} # default for xfs is "-f"
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osd mount options {fs-type} = {mount options} # default mount option is "rw, noatime"
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For example::
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osd mkfs type = btrfs
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osd mkfs options btrfs = -m raid0
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osd mount options btrfs = rw, noatime
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For each ``[osd.n]`` section of your configuration file, specify the storage device.
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For example::
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[osd.1]
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devs = /dev/sda
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[osd.2]
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devs = /dev/sdb
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Run ``mkcephfs``
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================
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Once you have copied your Ceph Configuration to the OSD Cluster hosts
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and created the default directories, you may deploy Ceph with the
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``mkcephfs`` script.
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.. note:: ``mkcephfs`` is a quick bootstrapping tool. It does not handle more
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complex operations, such as upgrades.
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To run ``mkcephfs``, execute the following::
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cd /etc/ceph
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sudo mkcephfs -a -c /etc/ceph/ceph.conf -k ceph.keyring
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.. note:: For ``mkcephfs`` to use the ``mkfs`` configuration options, you MUST
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specify a ``devs`` entry for each OSD.
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The script adds an admin key to the ``ceph.keyring``, which is analogous to a
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root password. See `Authentication`_ when running with ``cephx`` enabled. To
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start the cluster, execute the following::
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sudo service ceph -a start
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See `Operating a Cluster`_ for details. Also see `man mkcephfs`_.
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.. _Authentication: ../authentication
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.. _Operating a Cluster: ../../operations/
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.. _man mkcephfs: ../../../man/8/mkcephfs
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.. toctree::
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:hidden:
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../../../man/8/mkcephfs
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