---
title: Adding MONs
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/ceph/docs/adding-mons
---

*Submit*

# Adding MONs

MONs are added via a new ceph-mon unit.

1. Ensure that the cluster is in a healthy state. On any MON (such as the leader unit here) run a status check:

   ```
   juju ssh ceph-mon/leader sudo ceph status
   ```
2. Add a containerised ceph-mon unit to existing machine #3:

   ```
   juju add-unit --to lxd:3 ceph-mon
   ```

Recall that a cluster should always have an odd number of MONs.

---

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This page was last modified 3 years ago. [Help improve this document in the forum](https://discourse.ubuntu.com/t/adding-mons/18784).