Docker container is not accessible via curl or browser - docker

Question

I used following command to create a nginx container.
$ docker run -it -d --name test-nginx -p 8090:8091 nginx
and it seems to be up and running fine
$ docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
e36f30ce7854 nginx "/docker-entrypoint.…" About an hour ago Up About an hour 80/tcp, 0.0.0.0:8090->8091/tcp, :::8090->8091/tcp test-nginx
But I'm not able to access the container via browser or curl command. I get the following error.
$ curl localhost
curl: (7) Failed connect to localhost:80; Connection refused
$ curl localhost:8090
curl: (56) Recv failure: Connection reset by peer
curl localhost:8091
curl: (7) Failed connect to localhost:8091; Connection refused
$ curl 10.57.8.115
curl: (7) Failed connect to 10.57.8.115:80; Connection refused
$ curl 10.57.8.115:8090
curl: (7) Failed connect to 10.57.8.115:8090; Connection refused
$ curl 10.57.8.115:8091
curl: (7) Failed connect to 10.57.8.115:8091; Connection refused
Could anyone please help me what is the issue and when I do
$ curl localhost:8090
It gives the following error?
curl: (56) Recv failure: Connection reset by peer

Answer 1

nginx listens on port 80 within the container, so that is the port you need to expose on the host. You are exposing port 8091. So your command should be:
docker run -it -d --name test-nginx -p 8091:80 nginx
to expose container port 80 on local host port 8091. Your curl command should then run successfully:
$ curl -I localhost:8091
HTTP/1.1 200 OK
Server: nginx/1.23.1
Date: Fri, 07 Oct 2022 07:29:43 GMT
Content-Type: text/html
Content-Length: 615
Last-Modified: Tue, 19 Jul 2022 14:05:27 GMT
Connection: keep-alive
ETag: "62d6ba27-267"
Accept-Ranges: bytes