Whether it is possible to organize DNS through ports on one ip?

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Dmitry Baskakov2021-09-24 05:00:29

System administration

Dmitry Baskakov, 2021-09-24 05:00:29

There is a VPS with docker, you need to somehow correlate the domain and the desired container. It seemed to me the most logical to forward some port from the container, and then specify the ip with this port in the DNS system. However, I do not know if this is possible, and if so, through which program can this be implemented

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4 answer(s)

S

Sanes, 2021-09-24
@Sanes

No. This is done through Nginx Proxy.

R

Rsa97, 2021-09-24
@Rsa97

For some protocols, this can be done through SRV records, for some it is not possible.

C

CityCat4, 2021-09-24
@CityCat4

DNS is a database that links a name and an IP forward and backward. And she can't do anything else . Well, also correlate the name with a certain comment (as is done in SPF / DKIM)

M

Martsial, 2021-09-25
@Martsial

It is possible to spread different containers across subdomains through a proxy like NGinx / HAPRoxy.
That is, to map subdomains to ports within the same host. In DNS, such mapping cannot be done.
subdomain1.domain.ru -> https -> haproxy/nginx -> http:port=111 -> container1
subdomain2.domain.ru -> https -> haproxy/nginx -> http:port=222 -> container2
subdomain3.domain. en -> https -> haproxy/nginx -> http:port=333 -> container3