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https://github.com/ceph/ceph-salt

Deploy Ceph clusters using cephadm
https://github.com/ceph/ceph-salt

cephadm saltstack-formula

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Deploy Ceph clusters using cephadm

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# ceph-salt - Deploy Ceph clusters using cephadm
 [![Build Status](https://travis-ci.com/ceph/ceph-salt.svg?branch=master)](https://travis-ci.com/ceph/ceph-salt) [![codecov](https://codecov.io/gh/ceph/ceph-salt/branch/master/graph/badge.svg)](https://codecov.io/gh/ceph/ceph-salt)



This project provides tools for deploying [Ceph][ceph] clusters managed by

[cephadm][cephadm] using [Salt][salt]. It delivers missing pieces to fully

manage a Ceph cluster with cephadm:



- OS management (performing OS updates, ntp, tuning)

- Install required RPM dependencies

- Bootstrap cephadm

- Enhanced bootstrapping by defining roles for Salt minions



# Components



This repository contains two components:



1. `ceph-salt-formula` is a Salt Formula using Salt Highstates to manage Ceph

   minions.

2. `ceph-salt` is a CLI tool to manage the Salt Formula.



# Architecture



![](_images/architecture.png)



# Setup



In order to use `ceph-salt`, you need a working Salt cluster and minion IDs

must be resolvable to IP addresses (e.g. `host `).



Now, install `ceph-salt` on your Salt Master from the openSUSE

repositories:



```

zypper in ceph-salt

```



Afterwards, reload the salt-master daemon:



```

systemctl restart salt-master

salt \* saltutil.sync_all

```



# Usage



To deploy a Ceph cluster, first run `config` to start the configuration shell to

set the initial deployment of your cluster:



```

ceph-salt config

```



This opens a shell where you can manipulate ceph-salt's configuration. Each

configuration option is present under a configuration group. You can navigate

through the groups and options using the familiar `ls` and `cd` commands

similar to a regular shell. In each path you can type `help` to see the

available commands. Different options might have different commands available.



First step of configuration is to add the salt-minions that should be managed

by`ceph-salt`.

The `add` command under `/ceph_cluster/minions` option supports autocomplete

and glob expressions:



```

/ceph_cluster/minions add *

```



Then we must specify which minions will be used to deploy Ceph.

Those minions will be Ceph nodes controlled by cephadm:



```

/ceph_cluster/roles/cephadm add *

```



And which of them will have admin "keyring" installed:



```

/ceph_cluster/roles/admin add *

```



Next step is to specify which minion should be used to run `cephadm bootstrap ...`.

This minion will be the Ceph cluster's first Mon and Mgr.



```

/ceph_cluster/roles/bootstrap set node1.test.com

```



Now we need to set the SSH key pair to be used by the Ceph orchestrator.

The SSH key can be generated by ceph-salt with the following command:



```

/ssh generate

```



Alternatively, you can import existing keys by providing the path to the

private and public key files:



```

/ssh/private_key import /root/.ssh/id_rsa

/ssh/public_key import /root/.ssh/id_rsa.pub

```



(Just be aware that ceph-salt does not support SSH private keys that are protected

with a password)



In the typical ("storage appliance") case, one node of the cluster (typically

the "admin node") will be designated as the "time server host". This node will

sync its clock against one or more external servers (e.g. "pool.ntp.org"), and

all other nodes in the cluster will sync their clocks against this node:



```

/time_server/servers add 

/time_server/external_servers add pool.ntp.org

```



Ceph-salt can also configure all nodes to sync against an arbitrary host - this

can be useful when setting up a cluster at a site that already has a single

source of time:



```

/time_server/servers add 

```



(In this case, the on-site time server is assumed to be already configured and

ceph-salt will make no attempt to manage it.)



ceph-salt can also be told not to touch the time sync configuration:



```

/time_server disable

```



In this case, it is up to the user to ensure that some form of time syncing is

configured and running on all machines in the cluster before triggering

`ceph-salt apply`. This is because `cephadm` will refuse to run without it.



Finally we need to set the Ceph container image path:



```

/cephadm_bootstrap/ceph_image_path set registry.opensuse.org/filesystems/ceph/octopus/images/ceph/ceph

```



Afterwards, you can exit the `ceph-salt` configuration shell by typing `exit`

or pressing `[Ctrl]+[d]`. Now use the `apply` command to start the

`ceph-salt-formula` and execute the deployment:



```

ceph-salt apply

```



Check man page for a full list of available commands:



```

man ceph-salt

```



[ceph]: https://ceph.io/

[salt]: https://www.saltstack.com/

[cephadm]: https://docs.ceph.com/en/octopus/cephadm/