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Provisioning Ceph Cluster On CentOs

This document describes the mechanism to create ceph cluster on CentOS nodes. It also can help the tendrl developer in ceph cluster creation part and ceph cluster import part.

Install OS on Each Machines

  • Provisioner Node : CentOs 7

  • Mon : CentOs 7

  • Osd’s : CentOs 7

Configure Provisioner Node

  • Installing ansible in provisioner node using epel repo. Run the following command to install the ansible:

wget http://dl.fedoraproject.org/pub/epel/7/x86_64/e/epel-release-7-9.noarch.rpm
rpm -ivh epel-release-7-9.noarch.rpm

  • Install ansible:

yum install ansible

  • Update the node:

yum update

Configuring Firewall

  • Configure the firewall based on steps involved in OPEN REQUIRED PORT section

http://docs.ceph.com/docs/hammer/start/quick-start-preflight/

Configuring Network Time Protocol:

  • You must configure Network Time Protocol (NTP) on all Ceph monitor nodes and administration nodes. Ensure that Ceph nodes are NTP peers.

    • As root, install the ntp package: yum install ntp

    • As root, enable the NTP service to be persistent across a reboot: systemctl enable ntpd

    • As root, start the NTP service and ensure it is running: systemctl start ntpd, systemctl status ntpd

    • Ensure that NTP is synchronizing Ceph monitor node clocks properly: ntpq -p

Enabling Password-Less Ssh in Provisioner Node:

 1. ssh-keygen

 2. ssh-copy-id <username>@<hostname> (hostname : centos node names)

 3. vi ~/.ssh/config
        Host node1
          Hostname <hostname>
          User <uername>
        Host node2
          Hostname <hostname>
          User <uername>
   (e.g)
        Host mon
              Hostname dhcp43-179.lab.eng.blr.redhat.com
              User root
        Host osd1
              Hostname dhcp41-152.lab.eng.blr.redhat.com
              User root
        Host osd2
              Hostname dhcp41-246.lab.eng.blr.redhat.com
              User root

 4. chmod 600 ~/.ssh/config

Configure ceph-ansible in Provisioner Node:

[mons]
hostnames

[osds]
hostnames

  • ansible all -m ping (checks pingable) if not check /etc/ansible/ansible.cfg

  • cd /usr/share/ceph-ansible/

  • cp site.yml.sample site.yml

  • cp group_vars/all.yml.sample group_vars/all.yml

  • cp group_vars/mons.yml.sample group_vars/mons.yml

  • cp group_vars/osds.yml.sample group_vars/osds.yml

  • vi group_vars/all

ceph_origin : un comment and choose 'distro'
monitor_interface : interface (e.g eth0)
journal_size : journal_size (e.g 10240)
public_network : (e.g 10.70.40.0/22)

  • vi group_vars/osds

uncomment :  journal_collocation (make it true), devices (edit devices e.g /dev/vdb and /dev/vdc)

  • ansible-playbook site.yml (to run)