Ansible playbooks to deploy Ceph, the distributed filesystem.

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README.md

ceph-ansible

Ansible playbook for Ceph!

What does it do?

General support for:

Monitors
OSDs
MDSs
RGW

More details:

Authentication (cephx), this can be disabled.
Supports cluster public and private network.
Monitors deployment. You can easily start with one monitor and then progressively add new nodes. So can deploy one monitor for testing purpose. For production, I recommend to always use an odd number of monitors, 3 tends to be the standard.
Object Storage Daemons. Like the monitors you can start with a certain amount of nodes and then grow this number. The playbook either supports a dedicated device for storing the journal or both journal and OSD data on the same device (using a tiny partition at the beginning of the device).
Metadata daemons.
Collocation. The playbook supports collocating Monitors, OSDs and MDSs on the same machine.
The playbook was validated on Debian Wheezy, Ubuntu 12.04 LTS and CentOS 6.4.
Tested on Ceph Dumpling and Emperor.
A rolling upgrade playbook was written, an upgrade from Dumpling to Emperor was performed and worked.

Setup with Vagrant

Run your virtual machines:

$ vagrant up
...
...
...
 ____________
< PLAY RECAP >
 ------------
        \   ^__^
         \  (oo)\_______
            (__)\       )\/\
                ||----w |
                ||     ||


mon0                       : ok=16   changed=11   unreachable=0    failed=0
mon1                       : ok=16   changed=10   unreachable=0    failed=0
mon2                       : ok=16   changed=11   unreachable=0    failed=0
osd0                       : ok=19   changed=7    unreachable=0    failed=0
osd1                       : ok=19   changed=7    unreachable=0    failed=0
osd2                       : ok=19   changed=7    unreachable=0    failed=0
rgw                        : ok=20   changed=17   unreachable=0    failed=0

Check the status:

$ vagrant ssh mon0 -c "sudo ceph -s"
    cluster 4a158d27-f750-41d5-9e7f-26ce4c9d2d45
     health HEALTH_OK
     monmap e3: 3 mons at {ceph-mon0=192.168.0.10:6789/0,ceph-mon1=192.168.0.11:6789/0,ceph-mon2=192.168.0.12:6789/0}, election epoch 6, quorum 0,1,2 ceph-mon0,ceph-mon1,ceph-mon
     mdsmap e6: 1/1/1 up {0=ceph-osd0=up:active}, 2 up:standby
     osdmap e10: 6 osds: 6 up, 6 in
      pgmap v17: 192 pgs, 3 pools, 9470 bytes data, 21 objects
            205 MB used, 29728 MB / 29933 MB avail
                 192 active+clean

To re-run the Ansible provisioning scripts:

$ vagrant provision

Specifying fsid and secret key in production

The Vagrantfile specifies an fsid for the cluster and a secret key for the monitor. If using these playbooks in production, you must generate your own fsid in group_vars/all and monitor_secret in group_vars/mons. Those files contain information about how to generate appropriate values for these variables.