mirror of
https://github.com/ceph/ceph
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169c5de4a4
Without apt-get update the repository added to the sources.list is not taken into consideration and an older version of ceph-deploy is going to be installed. Signed-off-by: Loic Dachary <loic@dachary.org>
155 lines
4.5 KiB
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155 lines
4.5 KiB
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=====================
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Preflight Checklist
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=====================
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.. versionadded:: 0.60
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Thank you for trying Ceph! Petabyte-scale data clusters are quite an
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undertaking. Before delving deeper into Ceph, we recommend setting up a two-node
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demo cluster to explore some of the functionality. This **Preflight Checklist**
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will help you prepare an admin node and a server node for use with
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``ceph-deploy``.
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.. ditaa::
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/----------------\ /----------------\
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| Admin Node |<------->| Server Node |
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| cCCC | | cCCC |
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\----------------/ \----------------/
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Before you can deploy Ceph using ``ceph-deploy``, you need to ensure that you
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have a few things set up first on your admin node and on nodes running Ceph
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daemons.
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Install an Operating System
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===========================
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Install a recent release of Debian or Ubuntu (e.g., 12.04, 12.10, 13.04) on your
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nodes. For additional details on operating systems or to use other operating
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systems other than Debian or Ubuntu, see `OS Recommendations`_.
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Install an SSH Server
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=====================
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The ``ceph-deploy`` utility requires ``ssh``, so your server node(s) require an
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SSH server. ::
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sudo apt-get install openssh-server
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Create a User
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=============
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Create a user on nodes running Ceph daemons.
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.. tip:: We recommend a username that brute force attackers won't
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guess easily (e.g., something other than ``root``, ``ceph``, etc).
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::
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ssh user@ceph-server
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sudo useradd -d /home/ceph -m ceph
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sudo passwd ceph
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``ceph-deploy`` installs packages onto your nodes. This means that
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the user you create requires passwordless ``sudo`` privileges.
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.. note:: We **DO NOT** recommend enabling the ``root`` password
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for security reasons.
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To provide full privileges to the user, add the following to
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``/etc/sudoers.d/ceph``. ::
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echo "ceph ALL = (root) NOPASSWD:ALL" | sudo tee /etc/sudoers.d/ceph
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sudo chmod 0440 /etc/sudoers.d/ceph
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Configure SSH
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=============
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Configure your admin machine with password-less SSH access to each node
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running Ceph daemons (leave the passphrase empty). ::
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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 (/ceph-client/.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 /ceph-client/.ssh/id_rsa.
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Your public key has been saved in /ceph-client/.ssh/id_rsa.pub.
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Copy the key to each node running Ceph daemons::
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ssh-copy-id ceph@ceph-server
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Modify your ~/.ssh/config file of your admin node so that it defaults
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to logging in as the user you created when no username is specified. ::
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Host ceph-server
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Hostname ceph-server.fqdn-or-ip-address.com
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User ceph
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Install ceph-deploy
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===================
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To install ``ceph-deploy``, execute the following::
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wget -q -O- 'https://ceph.com/git/?p=ceph.git;a=blob_plain;f=keys/release.asc' | sudo apt-key add -
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echo deb http://ceph.com/debian-cuttlefish/ $(lsb_release -sc) main | sudo tee /etc/apt/sources.list.d/ceph.list
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sudo apt-get update
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sudo apt-get install ceph-deploy
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Ensure Connectivity
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===================
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Ensure that your admin node has connectivity to the network and to your Server
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node (e.g., ensure ``iptables``, ``ufw`` or other tools that may prevent
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connections, traffic forwarding, etc. to allow what you need).
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.. tip:: The ``ceph-deploy`` tool is new and you may encounter some issues
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without effective error messages.
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Once you have completed this pre-flight checklist, you are ready to begin using
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``ceph-deploy``.
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Hostname Resolution
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===================
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Ensure that your admin node can resolve the server node's hostname. ::
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ping {server-node}
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If you execute ``ceph-deploy`` against the localhost, ``ceph-deploy``
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must be able to resolve its IP address. Consider adding the IP address
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to your ``/etc/hosts`` file such that it resolves to the hostname. ::
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hostname
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host -4 {hostname}
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sudo vim /etc/hosts
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{ip-address} {hostname}
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ceph-deploy {command} {hostname}
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.. tip:: The ``ceph-deploy`` tool will not resolve to ``localhost``. Use
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the hostname.
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Summary
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=======
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Once you have passwordless ``ssh`` connectivity, passwordless ``sudo``,
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installed ``ceph-deploy``, and you have ensured appropriate connectivity,
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proceed to the `Storage Cluster Quick Start`_.
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.. tip:: The ``ceph-deploy`` utility can install Ceph packages on remote
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machines from the admin node!
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.. _Storage Cluster Quick Start: ../quick-ceph-deploy
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.. _OS Recommendations: ../../install/os-recommendations
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