Deploying the manager daemons

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The Ceph Orchestrator deploys two Manager daemons by default. You can deploy additional manager daemons using the placement specification in the command line interface. To deploy a different number of Manager daemons, specify a different number. If you do not specify the hosts where the Manager daemons should be deployed, the Ceph Orchestrator randomly selects the hosts and deploys the Manager daemons to them.

Prerequisites

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Note: Ensure your deployment has at least three Ceph Managers in each deployment.

A running IBM Storage Ceph cluster.
Hosts are added to the cluster.

Procedure

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Log into the Cephadm shell:

Example
```
[root@host01 ~]# cephadm shell
```
You can deploy manager daemons in two different ways:

Method 1

Deploy manager daemons using placement specification on specific set of hosts:

Note: IBM recommends that you use the --placement option to deploy on specific hosts.

Syntax
```
ceph orch apply mgr --placement=" HOST_NAME_1 HOST_NAME_2 HOST_NAME_3"
```
Example
```
[ceph: root@host01 /]# ceph orch apply mgr --placement="host01 host02 host03"
```

Method 2

Deploy manager daemons randomly on the hosts in the storage cluster:

Syntax

ceph orch apply mgr NUMBER_OF_DAEMONS

Example

[ceph: root@host01 /]# ceph orch apply mgr 3

Verification

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List the service:

Example
```
[ceph: root@host01 /]# ceph orch ls
```

List the hosts, daemons, and processes:

Syntax

ceph orch ps --daemon_type=DAEMON_NAME

Example

[ceph: root@host01 /]# ceph orch ps --daemon_type=mgr