Preflight Checklist¶

New in version 0.60.

This Preflight Checklist will help you prepare an admin node for use with ceph-deploy, and server nodes for use with passwordless ssh and sudo.

Before you can deploy Ceph using ceph-deploy, you need to ensure that you have a few things set up first on your admin node and on nodes running Ceph daemons.

Install an Operating System¶

Install a recent release of Debian or Ubuntu (e.g., 16.04 LTS) on your nodes. For additional details on operating systems or to use other operating systems other than Debian or Ubuntu, see OS Recommendations.

Install an SSH Server¶

The ceph-deploy utility requires ssh, so your server node(s) require an SSH server.

sudo apt-get install openssh-server

Create a User¶

Create a user on nodes running Ceph daemons.

Tip

We recommend a username that brute force attackers won’t guess easily (e.g., something other than root, ceph, etc).

ssh user@ceph-server
sudo useradd -d /home/ceph -m ceph
sudo passwd ceph

ceph-deploy installs packages onto your nodes. This means that the user you create requires passwordless sudo privileges.

Note

We DO NOT recommend enabling the root password for security reasons.

To provide full privileges to the user, add the following to /etc/sudoers.d/ceph.

echo "ceph ALL = (root) NOPASSWD:ALL" | sudo tee /etc/sudoers.d/ceph
sudo chmod 0440 /etc/sudoers.d/ceph

Configure SSH¶

Configure your admin machine with password-less SSH access to each node running Ceph daemons (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 node running Ceph daemons:

ssh-copy-id ceph@ceph-server

Modify your ~/.ssh/config file of your admin node so that it defaults to logging in as the user you created when no username is specified.

Host ceph-server
        Hostname ceph-server.fqdn-or-ip-address.com
        User ceph

Install ceph-deploy¶

To install ceph-deploy, execute the following:

wget -q -O- 'https://download.ceph.com/keys/release.asc' | sudo apt-key add -
echo deb https://download.ceph.com/debian-nautilus/ $(lsb_release -sc) main | sudo tee /etc/apt/sources.list.d/ceph.list
sudo apt-get update
sudo apt-get install ceph-deploy

Ensure Connectivity¶

Ensure that your Admin node has connectivity to the network and to your Server node (e.g., ensure iptables, ufw or other tools that may prevent connections, traffic forwarding, etc. to allow what you need).

Once you have completed this pre-flight checklist, you are ready to begin using ceph-deploy.