Is secondary management server able to handle infra in data center 1

[anirudh09041]

Hi,

We are setting up cloudstack according to multi-site deployment model as given in cloudstack documentation.

We have 2 data centers and we are planning to have management server running on both data centers.

Based on the image, if suppose we have outage in data center 1 and primary management server goes down will secondary management server be able to provision infra in data center 1.

Another Question: Do these both management servers need to be on same network ??

[cookesan]

I would not model these as primary and secondary management servers. In CloudStack they are management-server nodes sharing the CloudStack database and agent connectivity.

If only the management server in data center 1 is down, another management server can take over as long as it can reach the same CloudStack database and the data-center-1 hosts, system VMs, and storage management endpoints. The agent code is built around a list of management server addresses and can migrate an agent connection to another reachable management server; the database config is common CloudStack state, not per-zone state.

If the whole data center 1 is unreachable, a management server in data center 2 will not be able to provision resources in data center 1 just because it is still running. It still needs network reachability to the hosts and the management/storage networks for that zone.

So they do not need to be on the same L2 network, but they do need routable connectivity for the CloudStack control plane: shared database access, API/UI/load-balancer access as you design it, and management-server-to-agent/system-VM reachability for the zones they are expected to control.