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DeepSea

A collection of Salt files for deploying, managing and automating Ceph.

The goal is to manage multiple Ceph clusters with a single salt master. At this time, only a single Ceph cluster can be managed.

The diagram should explain the intended flow for the orchestration runners and related salt states.

Status

Automatic discovery, configuration and deployment of Ceph clusters works. RGW deployment works for single site deployements. MDS deployment and CephFS creation works.

Get Involved

To learn more about DeepSea, take a look at the Wiki.

There is also a dedicated mailing list deepsea-users. If you have any questions, suggestions for improvements or any other feedback, please join us there! We look forward to your contribution.

If you think you've found a bug or would like to suggest an enhancement, please submit it via the bug tracker on GitHub.

For contributing to DeepSea, refer to the contribution guidelines

Usage

Prepare Salt

Install and configure the Salt master

  • Install salt-master on one host. We shall refer to this host as the admin node.
  • It is a recommended best practice to have a management network for Ceph to prevent management traffic from interfering with Ceph data traffic. If you have a network designated for management traffic, configure the Salt master process to communicate only on the cluster's management interface. This can be done by adding a file /etc/salt/master.d/interface.conf with the content below where X.X.X.X is the IP address of the admin node on the management network. 
    interface: X.X.X.X
  • It may be useful to add the salt network alias for the admin node, as salt is the name of the Salt master minions will try to connect with by default.

Install and configure the Salt minions

  • Install salt-minion on all hosts including the admin node.
  • From the admin node, accept the Salt keys for all nodes in the Ceph cluster (e.g. salt-key -A -y)
  • If you choose not to add the salt network alias for the admin node, you will need to edit the file /etc/salt/minion on each minion and update the master option to refer to the admin node.

A theoretical example

Note that this example is too small to work in reality. It is only to demonstrate the practical concepts.

  • This is a snippet from an example /etc/hosts file for our theoretical Ceph cluster. You can see the salt alias for the admin node on the management interface. 
    192.168.10.254  admin-management admin.ceph salt
192.168.10.11   mon1-management mon1.ceph
192.168.10.21   data1-management data1.ceph

172.16.1.254    admin-public admin admin.ceph
172.16.1.11     mon1-public mon1 mon1.ceph
172.16.1.21     data1-public data1 data1.ceph

172.16.2.254    admin-cluster admin.ceph
172.16.2.11     mon1-cluster mon1.ceph
172.16.2.21     data1-cluster data1.ceph
  • /etc/salt/master.d/interface.conf in our example would be 
    # IP address of admin node on management network
interface: 192.168.10.254
  • After accepting the Salt keys on the master, you can execute the command salt-key --list-all on the admin node, and you should see that each minion is listed under Accepted Keys and that each minion has the same id as is demonstrated for our theoretical cluster. (Each entry under Accepted Keys is a minion id by which Salt and DeepSea will target the node) 
    > salt-key --list-all
Accepted Keys:
admin.ceph
data1.ceph
mon1.ceph
Denied Keys:
Unaccepted Keys:
Rejected Keys:

Install DeepSea

  • Install rpm
  • For non-RPM-distros, try make install.

Configure

  • DeepSea needs to know which node will act as the Salt master. To avoid any possible user confusion, DeepSea enforces that all minion hostnames (including the admin node's hostname) should match the minion id. Edit /srv/pillar/ceph/master_minion.sls, and ensure the value of master_minion matches the minion id for the admin node. (In our example from Prepare Salt above, the value should be admin.ceph.)

Steps

  • Run salt-run state.orch ceph.stage.0 or salt-run state.orch ceph.stage.prep
  • Run salt-run state.orch ceph.stage.1 or salt-run state.orch ceph.stage.discovery
  • Create /srv/pillar/ceph/proposals/policy.cfg. Examples are here
  • Run salt-run state.orch ceph.stage.2 or salt-run state.orch ceph.stage.configure
  • Run salt-run state.orch ceph.stage.3 or salt-run state.orch ceph.stage.deploy
  • Run salt-run state.orch ceph.stage.4 or salt-run state.orch ceph.stage.services

Details on policy.cfg

The discovery stage (or stage 1) creates many configuration proposals under /srv/pillar/ceph/proposals. The files contain configuration options for Ceph clusters, potential storage layouts and role assignments for the cluster minions. The policy.cfg specifies which of these files and options are to be used for the deployment.

Please refer to the Policy wiki page for more detailed information.

Test intial deployment and generating load

Once a cluster is deployed one might want to verify functionality or run benchmarks to verify the cluster works as expected.

  • In order to gain some confidence in your cluster after the inital deployment (stage 3) run salt-run state.orch ceph.benchmarks.baseline. This runs an osd benchmark on each OSD and aggregates the results. It reports your average OSD performance and points out OSDs that deviate from the average. Please note that for now the baseline benchmark assumes all uniform OSDs.
  • To load test CephFS run salt-run state.orch ceph.benchmarks.cephfs. This requires a running MDS (deploy in stage 4) and at least on minion with the mds-client role. The cephfs_benchmark stage will then mount the CephFS instance on the mds-client and run a bunch of fio tests. See the benchmark readme for futher details.
  • more to come