The backend DNS


#1

Hi

I have one question about backend hostname.

when the backend DNS record (A) is changed, Do I need to deploy again on the admin page? or when ttl is expired, the fastly cdn is automatically change the IP address?

backend host name
1.test.com A 1.1.1.1

change into here

backend host name
1.test.com A 2.2.2.2


#2

Hi redbox,

You do not need to deploy again when the backend’s IP changes in the DNS. Each cache node, when the DNS TTL expires and a new connection to your backend is needed, will query the DNS again.


#3

Hi

Thank you for your reply.

That’s Good! I’ve always been thinking it must re-deploy the VCL.
Because according to this topics,when backend’s IP changes in the dns, It must reload the VCL.

https://www.varnish-cache.org/forum/topic/91