Ceph Storage - Ceph Deployment Preparation (part 4)

In this article we will prepare admin node for Ceph deployment.


Create CEPH admin on all nodes (or other dedicated ceph user who will be part of sudo group):

Skip this step if the user was created during Debian installation.

# useradd -d /home/cephadmin -m cephadmin -s /bin/bash
# passwd cephadmin
# adduser cephadmin sudo 

Give cephadmin passwordless sudo permissions:

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

Enable password-less SSH

IMPORTANT: Execute only on the Admin node

IMPORTANT: Login with cephadmin and use this user from now on.

Generate a public key for the cephadmin user and install it on all ceph nodes

$ ssh-keygen
$ ssh-copy-id cephadmin@ceph2
$ ssh-copy-id cephadmin@ceph3
$ ssh-copy-id cephadmin@ceph4

Test: You should be able to ssh into any ceph node without entering password. Eg: “ssh cephadmin@ceph2”

Configure SSH access by editing the .ssh/config file.

The following example configuration will let you to avoid using --username{username} each time you execute ceph-deploy.

Host ceph2
   Hostname ceph2
   User cephadmin
Host ceph3
   Hostname ceph3
   User cephadmin
Host ceph4
   Hostname ceph4
   User cephadmin 

Add Ceph repository to your apt configuration

# echo deb http://ceph.com/debian-hammer/ $(lsb_release -sc) main | sudo tee /etc/apt/sources.list.d/ceph.list

 Install the trusted key with

# wget -q -O- 'https://ceph.com/git/?p=ceph.git;a=blob_plain;f=keys/release.asc' | sudo apt-key add -

 Note: if you get the following error “ceph gpg: no valid OpenPGP data found.” it means wget version is too old and broken. The issue is fixed in Jessie wget version. Download the file manually and use “apt-key add <file>” manually. I used the wget command in Jessie, downloaded the file, copied it to Wheezy nodes and then used “apt-key add <file>” to install the trusted key.

 # sudo apt-get udpate


# apt-cache search ceph


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