ceph/doc/start/quick-start-preflight.rst

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=====================
Preflight Checklist
=====================
.. versionadded:: 0.60
Thank you for trying Ceph! We recommend setting up a ``ceph-deploy`` admin node
and a 3-node :term:`Ceph Storage Cluster` to explore the basics of Ceph. This
**Preflight Checklist** will help you prepare a ``ceph-deploy`` admin node and
three Ceph Nodes (or virtual machines) that will host your Ceph Storage Cluster.
Before proceeding any further, see `OS Recommendations`_ to verify that you have
a supported distribution and version of Linux.
.. ditaa::
/------------------\ /----------------\
| Admin Node | | node1 |
| +-------->+ |
| cephdeploy | | cCCC |
\---------+--------/ \----------------/
|
| /----------------\
| | node2 |
+----------------->+ |
| | cCCC |
| \----------------/
|
| /----------------\
| | node3 |
+----------------->| |
| cCCC |
\----------------/
Ceph Deploy Setup
=================
Add Ceph repositories to the ``ceph-deploy`` admin node. Then, install
``ceph-deploy``.
.. important:: Do not call ``ceph-deploy`` with ``sudo`` or run it as ``root``
if you are logged in as a different user, because it will not issue ``sudo``
commands needed on the remote host.
Advanced Package Tool (APT)
---------------------------
For Debian and Ubuntu distributions, perform the following steps:
#. Add the release key::
wget -q -O- 'https://ceph.com/git/?p=ceph.git;a=blob_plain;f=keys/release.asc' | sudo apt-key add -
#. Add the Ceph packages to your repository. Replace ``{ceph-stable-release}``
with a stable Ceph release (e.g., ``cuttlefish``, ``dumpling``, etc.).
For example::
echo deb http://ceph.com/debian-{ceph-stable-release}/ $(lsb_release -sc) main | sudo tee /etc/apt/sources.list.d/ceph.list
#. Update your repository and install ``ceph-deploy``::
sudo apt-get update && sudo apt-get install ceph-deploy
Red Hat Package Manager (RPM)
-----------------------------
For Red Hat(rhel6), CentOS (el6), and Fedora 17-19 (f17-f19) perform the
following steps:
#. Add the package to your repository. Open a text editor and create a
Yellowdog Updater, Modified (YUM) entry. Use the file path
``/etc/yum.repos.d/ceph.repo``. For example::
sudo vim /etc/yum.repos.d/ceph.repo
Paste the following example code. Replace ``{ceph-release}`` with
the recent major release of Ceph (e.g., ``firefly``). Replace ``{distro}``
with your Linux distribution (e.g., ``el6`` for CentOS 6, ``rhel6`` for
Red Hat 6, ``fc18`` or ``fc19`` for Fedora 18 or Fedora 19, and ``sles11``
for SLES 11). Finally, save the contents to the
``/etc/yum.repos.d/ceph.repo`` file. ::
[ceph-noarch]
name=Ceph noarch packages
baseurl=http://ceph.com/rpm-{ceph-release}/{distro}/noarch
enabled=1
gpgcheck=1
type=rpm-md
gpgkey=https://ceph.com/git/?p=ceph.git;a=blob_plain;f=keys/release.asc
#. Update your repository and install ``ceph-deploy``::
sudo yum update && sudo yum install ceph-deploy
.. note:: Some distributions (e.g., RHEL) require you to comment out
``Default requiretty`` in the ``/etc/sudoers`` file for ``ceph-deploy`` to
work properly. If editing, ``/etc/sudoers``, ensure that you use
``sudo visudo`` rather than a text editor.
Ceph Node Setup
===============
If you are using ``ceph-deploy`` version 1.1.3 and beyond, ``ceph-deploy``
will attempt to create the SSH key and copy it to the initial monitor nodes
automatically when you create the new cluster. For example::
ceph-deploy new node1
For other Ceph Nodes (and for initial monitors prior to ``ceph-deploy`` v1.1.3)
perform the following steps:
#. Create a user on each Ceph Node. ::
ssh user@ceph-server
sudo useradd -d /home/ceph -m ceph
sudo passwd ceph
#. Add ``root`` privileges for the user on each Ceph Node. ::
echo "ceph ALL = (root) NOPASSWD:ALL" | sudo tee /etc/sudoers.d/ceph
sudo chmod 0440 /etc/sudoers.d/ceph
#. Install an SSH server (if necessary) on each Ceph Node::
sudo apt-get install openssh-server
sudo yum install openssh-server
#. Configure your ``ceph-deploy`` admin node with password-less SSH access to
each Ceph Node. When configuring SSH access, do not use ``sudo`` or the
``root`` user. Leave the passphrase empty::
ssh-keygen
Generating public/private key pair.
Enter file in which to save the key (/ceph-client/.ssh/id_rsa):
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /ceph-client/.ssh/id_rsa.
Your public key has been saved in /ceph-client/.ssh/id_rsa.pub.
#. Copy the key to each Ceph Node. ::
ssh-copy-id ceph@node1
ssh-copy-id ceph@node2
ssh-copy-id ceph@node3
#. Modify the ``~/.ssh/config`` file of your ``ceph-deploy`` admin node so that
it logs in to Ceph Nodes as the user you created (e.g., ``ceph``). ::
Host node1
Hostname node1
User ceph
Host node2
Hostname node2
User ceph
Host node3
Hostname node3
User ceph
#. Ensure connectivity using ``ping`` with short hostnames (``hostname -s``).
Address hostname resolution issues and firewall issues as necessary.
**Note:** Hostnames should resolve to a network IP address, not to the
loopback IP address (e.g., hostnames should resolve to an IP address other
than ``127.0.0.1``).
.. note:: If you use your admin node as one of the Ceph Nodes, you must perform
these steps on the admin node too.
Summary
=======
This completes the Quick Start Preflight. Proceed to the `Storage Cluster
Quick Start`_.
.. _Storage Cluster Quick Start: ../quick-ceph-deploy
.. _OS Recommendations: ../os-recommendations