cURL same server from a inside docker container

Question

I saw a lot of similar problem but not exactly like mine... I have a classic architecture,

A server with docker, a stack with Traefik to dispatch request, and few stack of nginx/apache and php. Let's say

• website1.com
• website2.com

The problem is that I can't cURL another website from inside a docker container.

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If I try to curl from server itself

curl -v website2.com
curl -v https://website2.com

I get a valid response

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If I try to curl from website1 container

curl -v website2.com
curl -v https://website2.com

I can see

Trying XX.XX.XX.XX:443...

With my external IP (so the DNS should be OK) but I don't get any response so it end with a timeout message.

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If I add 192.168.48.4 website2.com into my /etc/hosts and I try to cURL, I get a valid response but tell me if I'm wrong but in this case it access through local and not from outside of the server

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By the way, I need to cURL from a "manager" website that get all domains from an API, so cURL should be dynamic and I can't really add all IP manually into a hosts file or whatever

I really want to access other containers from outside, like an external service

Do you have any suggestion? Thank you guys

Answer 1

Thanks for comment and specifically to this topic https://community.traefik.io/t/curl-from-container-a-to-b-blocked/1040/14

In my case, the firewall (ufw) of my host was "blocking" my http/https requests, even if my domains were accessible

Thoses commands fix my problem

sudo ufw allow http
sudo ufw allow https