how to upgrade the failover pair?

Simon Hobson dhcp1 at
Thu May 31 09:41:40 UTC 2018

Aleksey Perov <a.perov at> wrote:

> The draft plan is as follows:
> - stop the secondary;
> - turn the primary into partner-down;
> - reinstall the secondary;
> - wait until the primary reclaims all addresses in all pools;
> - stop the primary;
> - copy leases file from primary to secondary;
> - start the secondary in partner-down mode;
> - reinstall the primary;
> - turn the secondary into normal mode;
> - start the primary.
> Is anything wrong here?

Isn't the simplest - provided they are using the same level of failover protocol - to simply start up a clean upgraded secondary and allow it to transfer leases from the primary ? So :

Stop one partner, put the remaining one into partner down state.
Create new upgraded clean partner.
Start up new partner and allow the pair to synchronise.

Repeat for the other partner.

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