如何让docker容器使用80以外的端口

Question

I try to deploy self hosted Bitwarden service: https://bitwarden.com/help/article/install-on-premise/

When I run install script I get the following error:

docker: Error response from daemon: driver failed programming external connectivity 
on endpoint certbot 
(393789b88f2a15db0ae5fb0d3fdce83e14bd4d4eb890ffff0f946dc607953815): Error starting 
userland proxy: listen tcp4 0.0.0.0:80: bind: address already in use.
ERRO[0000] error waiting for container: context canceled 

Which is expected because I already have NGINX on this VM with a couple of websites and port 80 is being used by the host.

I heard that is is possible to make docker container use another host port, instead of 80. That is container will have port 80, but it will be something else externally on the host. I tried to change the mapping in the install script like 5000:80 instead of 80:80 but I keep getting the same error.

Am I doing something wrong, or what I am trying to do is not possible?

Answer 1

You can add range to the command and it will use the first available port. so -p 80-100:80 .

TO get the port that your actually mapping to use docker ps and it will show you what port it's mapped to.