[PVE-User] Multi Proxmox Cluster with common Ceph cluster

Franck Parisy franck at parisy.net
Sat Dec 26 18:20:28 CET 2015


2 DCs, 1 Proxmox and ceph cluster by DC and async mirror between them... What else ! 

I love Proxmox and Ceph ! 


Merry Christmas everybody 


----- Mail original -----

De: "Alexandre DERUMIER" <aderumier at odiso.com> 
À: "proxmoxve" <pve-user at pve.proxmox.com> 
Envoyé: Samedi 26 Décembre 2015 16:24:55 
Objet: Re: [PVE-User] Multi Proxmox Cluster with common Ceph cluster 

>>will wait jewel, it leaves me time to negociate a third DC ;-) 

Note, that with jewell, you don't need a third DC. 

you can build 2 ceph cluster, 1 on each dc, then do async mirror between them. 
(each ceph cluster is the backup of the other one) 





>>Will it be possible to manage a multi dc's ceph cluster with Proxmox ? 

Yes it's possible, if you have multicast (laybe2) working between them. 

Simply do 1 ceph cluster/ 1 proxmox cluster. 
But you need 3 DC to be sure to always have quorum (for proxmox and ceph monitor) 



----- Mail original ----- 
De: "Franck Parisy" <franck at parisy.net> 
À: "proxmoxve" <pve-user at pve.proxmox.com> 
Envoyé: Vendredi 25 Décembre 2015 19:11:43 
Objet: Re: [PVE-User] Multi Proxmox Cluster with common Ceph cluster 

Thank you very much Alexandre. 

I will wait jewel, it leaves me time to negociate a third DC ;-) 

Will it be possible to manage a multi dc's ceph cluster with Proxmox ? 


De: "Alexandre DERUMIER" <aderumier at odiso.com> 
À: "proxmoxve" <pve-user at pve.proxmox.com> 
Envoyé: Vendredi 25 Décembre 2015 15:39:13 
Objet: Re: [PVE-User] Multi Proxmox Cluster with common Ceph cluster 

Hi, 

you can have 1 ceph cluster, with 2 pools, 1 pool for each proxmox cluster. 


But with only 2 DC, It's not possible to always have quorum if you loose 1 DC. 

(you need quorum for ceph monitors). 

So, for real multi datacenter ceph cluster, you need 3dc, with 1 mon on each DC . 

Also note that ceph replication is syncronous, so you need to have good latencies between your DC. 



Next ceph release (jewel), will have rbd mirroring (asyncronous mirroring of pool or rbd volume), to remote ceph 
cluster, for disaster recovery. 





----- Mail original ----- 
De: "Franck Parisy" <franck at parisy.net> 
À: "proxmoxve" <pve-user at pve.proxmox.com> 
Envoyé: Vendredi 25 Décembre 2015 12:26:32 
Objet: [PVE-User] Multi Proxmox Cluster with common Ceph cluster 

Hello, 

Is it posssible to create a multi Proxmox cluster with 1 Ceph cluster ? 

Explanation : 

2 Datacenter 

D1 : 192.168.0.0/24 
D2 : 192.168.1.0/24 

1 D1 Proxmox cluster 
1 D2 Proxmox cluster 

1 common Ceph cluster ( with a little crushmap to replicate D1 to D2 and D2 to D1) in the 2 Proxmox cluster 


Thanks 


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