Change Public Network and / or Cluster Network in Ceph

V

vaschthestampede

Active Member
Oct 21, 2020
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Just to be sure.

To change the Public Network and / or Cluster Network in Ceph you can modify the Cheph configuration file:
Code: 
/etc/pve/ceph.conf

For example, my actual configuration on my test machine:
Code: 
[global]
         auth_client_required = cephx
         auth_cluster_required = cephx
         auth_service_required = cephx
         cluster_network = 10.1.0.245/22
         fsid = dc0e8f62-4ab8-441b-9891-0cf905b52e87
         mon_allow_pool_delete = true
         mon_host =  10.1.0.245
         osd_pool_default_min_size = 2
         osd_pool_default_size = 2
         public_network = 10.1.0.245/22

[client]
         keyring = /etc/pve/priv/$cluster.$name.keyring

[mon.pveZZ]
         public_addr = 10.1.0.245

If I want to change the networks I will have to chenge cluster_network and public_network:
Code: 
[global]
         auth_client_required = cephx
         auth_cluster_required = cephx
         auth_service_required = cephx
         cluster_network = 10.10.10.1/25
         fsid = dc0e8f62-4ab8-441b-9891-0cf905b52e87
         mon_allow_pool_delete = true
         mon_host =  10.1.0.245
         osd_pool_default_min_size = 2
         osd_pool_default_size = 2
         public_network = 10.10.20.1/25

[client]
         keyring = /etc/pve/priv/$cluster.$name.keyring

[mon.pveZZ]
         public_addr = 10.1.0.245

Probably it will need a reboot.

Am I missing something?
 
Read ceph documentation about changing public_network because monitors depends on it.

On other side, changing cluster_network is almost only changing in config and restart.
 
czechsys said:
Read ceph documentation about changing public_network because monitors depends on it.
Click to expand...

So you need to chanche also "mon_host" and "public_addr":

Code: 
[global]
         auth_client_required = cephx
         auth_cluster_required = cephx
         auth_service_required = cephx
         cluster_network = 10.10.10.1/25
         fsid = dc0e8f62-4ab8-441b-9891-0cf905b52e87
         mon_allow_pool_delete = true
         mon_host =  10.10.20.1
         osd_pool_default_min_size = 2
         osd_pool_default_size = 2
         public_network = 10.10.20.1/25

[client]
         keyring = /etc/pve/priv/$cluster.$name.keyring

[mon.pveZZ]
         public_addr = 10.10.20.1
 
vaschthestampede said:
So you need to chanche also "mon_host" and "public_addr":

Code: 
[global]
         auth_client_required = cephx
         auth_cluster_required = cephx
         auth_service_required = cephx
         cluster_network = 10.10.10.1/25
         fsid = dc0e8f62-4ab8-441b-9891-0cf905b52e87
         mon_allow_pool_delete = true
         mon_host =  10.10.20.1
         osd_pool_default_min_size = 2
         osd_pool_default_size = 2
         public_network = 10.10.20.1/25

[client]
         keyring = /etc/pve/priv/$cluster.$name.keyring

[mon.pveZZ]
         public_addr = 10.10.20.1
Click to expand...

Hi @vaschthestampede,

Sorry to reopen this topic, but have you made it? Have you changed the "cluster_network" without issues?

I'm asking this because I'm about to change my hosts configuration to add the cluster network now. We only configured the "public_network" (but it's on a private network); so, I just need to add the "cluster_network" the "global" section and add the "cluster_addr" in the "mon.xxxxxx" sections? Is it just that?

EDIT: I just need to change the required parameters in "/etc/pve/ceph.conf" and reboot?

Thank you very much.
 
Last edited:
vaschthestampede said:
Yes, the test was successful.
Click to expand...
Hi @vaschthestampede,

I've changed the configuration, saved it, it replicated the configuration to the other hosts in the cluster with no issues, but I still have no traffic at all in the cluster network. Do I need to change something else?

Here is my lab config (pretty much default), just for reference (already with the cluster network in place):
Code: 
[global]
     auth_client_required = cephx
     auth_cluster_required = cephx
     auth_service_required = cephx
     fsid = 5dfa841b-xxxx-xxxx-xxxx-xxxxxxxxxxxx
     mon_allow_pool_delete = true
     mon_host = 10.0.1.221 10.0.1.222 10.0.1.223 10.0.1.224 10.0.1.225 10.0.1.226
     ms_bind_ipv4 = true
     ms_bind_ipv6 = false
     osd_pool_default_min_size = 2
     osd_pool_default_size = 3
     public_network = 10.0.1.221/24
     cluster_network = 172.16.172.1/24

[client]
     keyring = /etc/pve/priv/$cluster.$name.keyring

[mds]
     keyring = /var/lib/ceph/mds/ceph-$id/keyring

[mds.pve1]
     host = pve1
     mds_standby_for_name = pve

[mds.pve2]
     host = pve2
     mds_standby_for_name = pve

[mds.pve3]
     host = pve3
     mds_standby_for_name = pve

[mds.pve4]
     host = pve4
     mds_standby_for_name = pve

[mds.pve5]
     host = pve5
     mds_standby_for_name = pve

[mds.pve6]
     host = pve6
     mds standby for name = pve

[mon.pve1]
     public_addr = 10.0.1.221
     cluster_addr = 172.16.172.1

[mon.pve2]
     public_addr = 10.0.1.222
     cluster_addr = 172.16.172.2

[mon.pve3]
     public_addr = 10.0.1.223
     cluster_addr = 172.16.172.3

[mon.pve4]
     public_addr = 10.0.1.224
     cluster_addr = 172.16.172.4

[mon.pve5]
     public_addr = 10.0.1.225
     cluster_addr = 172.16.172.5

[mon.pve6]
     public_addr = 10.0.1.226
     cluster_addr = 172.16.172.6

Thank you very much in advance. Best regards.
 
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