CentOS 7
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Ceph Luminous : Configure Ceph Cluster2017/10/08

Install Distributed File System Ceph to Configure Storage Cluster.
For example on here, Configure Cluster with 1 admin Node and 3 Storage Node like follows.
        +--------------------+           |           +-------------------+
        |   [dlp.srv.world]  |  |   10.0.0.x|   [   Client  ]   |
        |    Ceph-Deploy     +-----------+-----------+                   |
        |                    |           |           |                   |
        +--------------------+           |           +-------------------+
            |                            |                            |
            |                   |                   | 
+-----------+-----------+    +-----------+-----------+    +-----------+-----------+
|   [node01.srv.world]  |    |   [node02.srv.world]  |    |   [node03.srv.world]  |
|     Object Storage    +----+     Object Storage    +----+     Object Storage    |
|     Monitor Daemon    |    |                       |    |                       |
|                       |    |                       |    |                       |
+-----------------------+    +-----------------------+    +-----------------------+

Add a user for Ceph admin on all Nodes.
It adds [cent] user on this example.
[2] Grant root priviledge to Ceph admin user just added above with sudo settings.
And also install required packages.
Furthermore, If Firewalld is running on all Nodes, allow SSH service.
Set all of above on all Nodes.
[root@dlp ~]#
echo -e 'Defaults:cent !requiretty\ncent ALL = (root) NOPASSWD:ALL' | tee /etc/sudoers.d/ceph

[root@dlp ~]#
chmod 440 /etc/sudoers.d/ceph

[root@dlp ~]#
yum -y install epel-release yum-plugin-priorities \

[root@dlp ~]#
sed -i -e "s/enabled=1/enabled=1\npriority=1/g" /etc/yum.repos.d/ceph.repo
[root@dlp ~]#
firewall-cmd --add-service=ssh --permanent

[root@dlp ~]#
firewall-cmd --reload

[3] On Monitor Node (Monitor Daemon), If Firewalld is running, allow required port.
[root@dlp ~]#
firewall-cmd --add-port=6789/tcp --permanent

[root@dlp ~]#
firewall-cmd --reload

[4] On Storage Nodes (Object Storage), If Firewalld is running, allow required ports.
[root@dlp ~]#
firewall-cmd --add-port=6800-7100/tcp --permanent

[root@dlp ~]#
firewall-cmd --reload

[5] Login as a Ceph admin user and configure Ceph.
Set SSH key-pair from Ceph Admin Node (it's "dlp.srv.world" on this example) to all storage Nodes.
[cent@dlp ~]$

Generating public/private rsa key pair.
Enter file in which to save the key (/home/cent/.ssh/id_rsa):
Created directory '/home/cent/.ssh'.
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /home/cent/.ssh/id_rsa.
Your public key has been saved in /home/cent/.ssh/id_rsa.pub.
The key fingerprint is:
SHA256:bIzF6NAyEzpeV2CHOrr0JBgttu95RslBQ9bEDooXVbA cent@dlp.srv.world
The key's randomart image is:

[cent@dlp ~]$
vi ~/.ssh/config
# create new ( define all nodes and users )

Host dlp
    Hostname dlp.srv.world
    User cent
Host node01
    Hostname node01.srv.world
    User cent
Host node02
    Hostname node02.srv.world
    User cent
Host node03
    Hostname node03.srv.world
    User cent

[cent@dlp ~]$
chmod 600 ~/.ssh/config
# transfer key file

[cent@dlp ~]$
ssh-copy-id node01

cent@node01.srv.world's password:

Number of key(s) added: 1

Now try logging into the machine, with:   "ssh 'node01'"
and check to make sure that only the key(s) you wanted were added.

[cent@dlp ~]$
ssh-copy-id node02

[cent@dlp ~]$
ssh-copy-id node03

[6] Install Ceph to all Nodes from Admin Node.
[cent@dlp ~]$
sudo yum -y install ceph-deploy
[cent@dlp ~]$
mkdir ceph

[cent@dlp ~]$
cd ceph

[cent@dlp ceph]$
ceph-deploy new node01
# install Ceph on each Node

[cent@dlp ceph]$
ceph-deploy install dlp node01 node02 node03
# settings for monitoring and keys

[cent@dlp ceph]$
ceph-deploy mon create-initial

[7] Configure Ceph Cluster from Admin Node.
# prepare Object Storage Daemon

[cent@dlp ceph]$
ceph-deploy osd prepare node01:/var/lib/ceph/osd node02:/var/lib/ceph/osd node03:/var/lib/ceph/osd
# activate Object Storage Daemon

[cent@dlp ceph]$
ceph-deploy osd activate node01:/var/lib/ceph/osd node02:/var/lib/ceph/osd node03:/var/lib/ceph/osd
# transfer config files

[cent@dlp ceph]$
ceph-deploy admin dlp node01 node02 node03

[cent@dlp ceph]$
sudo chmod 644 /etc/ceph/ceph.client.admin.keyring
# show status (display like follows if no problem)

[cent@dlp ceph]$
ceph health

[8] By the way, if you'd like to clean settings and re-configure again, do like follows.
# remove packages

[cent@dlp ceph]$
ceph-deploy purge dlp node01 node02 node03
# remove settings

[cent@dlp ceph]$
ceph-deploy purgedata dlp node01 node02 node03

[cent@dlp ceph]$
ceph-deploy forgetkeys
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