SSL with NGINX with .pem files

I need to add SSL certificate for my domain for my website on my NGINX server.

My domain provider gave me a zip file to download, which contains:

domain.cert.pem
intermediate.cert.pem
private.key.pem
public.key.pem

[For clarity: I did not rename 'domain', it is called domain.cert.pem]

I'm confused as to what to do, because all the tutorials I can find online require different files, some ending with .crt.

Does anyone have any advice?

My nginx conf:

server {
  listen 80 default_server;
  ssl on;
  server_name mydomain.com;

  ssl_certificate /usr/src/app/domain.cert.pem;
  ssl_certificate_key /usr/src/app/private.key.pem;

  # vue app & front-end files
  location / {
    root /usr/src/app/dist;
    try_files $uri /index.html;
  }

  # node api reverse proxy
  location /api/ {
    proxy_pass http://localhost:4000/;
  }
}

Error when restarting nginx:

nginx: [emerg] PEM_read_bio_X509("/usr/src/app/domain.ce

Solution 1:

cat intermediate.cert.pem >> domain.cert.pem

In your nginx conf:

server {
    ...
    ssl_certificate     /path/to/domain.cert.pem;
    ssl_certificate_key /path/to/private.key.pem;
    ...
}