Letsencrypt certificate for multiple ip addresses. Moving to another server

[DangerD1024]

I'm moving my website to another server and i don't want to have downtime while updating certificate.
Can i generate Letsencrypt certificate for domain example.com for both ip addresses (for old and new server)?

[orangepizza]

those certs are not tied to an ip address so just copy them to new server and configure server to use them

[rg305]

Hi @DangerD1024, welcome to the LE community forum

You can put a cert wherever you like; but it won't take the requests to that name with it.
Only DNS can control which IP(s) a name is tied to.

As far as:

@DangerD1024

I don't want to have downtime while updating certificate.

Again, the certificate can be copied well in advance; So there won't be any downtime associated directly to the "certificate update".
Where you can expect some "downtime" is with any ongoing connections; Which will break when DNS forces the clients to switch over to the new server IP.
[presuming both servers will be online at the same time - at different IPs]
There you might want to better understand the options available to you in order to minimize the impact on any ongoing client experience.