Will LetsEncrypt work well on apache with existing certificate?

[Recolic]

Please fill out the fields below so we can help you better.

My domain is:
https://www.recolic.net
My operating system is (include version):
CentOS 7
My web server is (include version):
Apache
My hosting provider, if applicable, is:
Alibaba Cloud
I can login to a root shell on my machine (yes or no, or I don’t know):
yes
I’m using a control panel to manage my site (no, or provide the name and version of the control panel):no

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Straight to the point: I have an working https website. I’d like to get a free ECC certificate, and that’s why I’m installing Let’s Encrypt.(Only RSA certificate is provided free of charge by Aliyun but I prefer ECC)
I wonder what will Certbot do to my well configured server? (i.e. Will it fail to configure apache? Or will any strange error occurs during my installation? )

Thanks for your help!

[serverco]

I’d run certbot with “certonly” so that it doesn’t attempt to reconfigure your apache. This will provide the cert ( and you can use “cerbot renew” to automatically renew it), but it won’t try and make any changes to your apache.

I haven’t tested, but I don’t believe it’s intelligent enough to know that you possibly want to install a duel cert, so that those who can use the EC cert, and those that can’t will fall back to the RSA cert- or however you want to do it.