Multiple Docker Containers Hosted In Nginx With URL Instead Of Subdomain - docker

Question

I'm a noob to docker, Nginx, and devops, so go easy on me.
I've followed a few tutorials that show me how to host multiple web apps through docker containers using Nginx and subdomains. I cannot create a new A Record for this domain, so I can't use subdomains, it has to be a url. If I could create a new A Record, I found a million tutorials that show me how to host it on ProjectA.example.com but since I don't have access to create a new A Record for the domain, I need to find a way to host it on something like example.com/ProjectA. Another obstacle is only port 80 is open to the outside, so all traffic must come through port 80 and be reverse proxied to whatever port the docker container is forwarding from.
So far I have an Nginx configuration that looks something like this
server {
root /var/www/html;
index index.html index.htm index.nginx-debian.html;
listen 80;
server\_name \_;
location / {
try\_files $uri $uri/ =404;
}
location /projectA {
proxy\_pass http://127.0.0.1:9001/;
}
location /projectB {
proxy\_pass http://127.0.0.1:9002/;
}
}
This works getting me to the homepage of the project. But the CSS of the website doesn't load, and whenever I click a link, it sends me to something like example.com/signup instead of example.com/projectA/signup. I tried making a wildcard location (location \~ /projectA.\*) but Nginx didn't like that. I was thinking there's probably a way I could get something like if the referring uri contains projectA, send them to example.com/projectA$uri but I couldn't find the documentation on the syntax.
Basically the question is, is this a good way to tackle the problem, and does anyone have a link to a tutorial or some documentation on how to do this?

Answer 1

Using a trailing slash behind location should do it:
location /projectA/ {
proxy_pass http://127.0.0.1:9001/;
leads /projectA/whatever to http://127.0.0.1:9001/whatever
If you want to use regex to rewrite, it's something like that:
location ~ ^/projectA/(.*)$ {
proxy_pass http://127.0.0.1:9001/$1;
or
location /projectA/ {
rewrite ^/projectA/whatever/(.*)$ /whatever.php?path=$1 break;
proxy_pass http://127.0.0.1:9001/;
}
leads /projectA/whatever/foo to http://127.0.0.1:9001/whatever.php?path=foo