Nginx cannot load certificate in docker container - docker

Question

So I'm trying to use nginx with a certbot certificate in a docker container, but I get this error, even though the file exists.
2022/10/07 11:08:47 [emerg] 15#15: cannot load certificate "/etc/nginx/certs/fullchain.pem": BIO_new_file() failed (SSL: error:02001002:system library:fopen:No such file or directory:fopen('/etc/nginx/certs/fullchain.pem','r') error:2006D080:BIO routines:BIO_new_file:no such file)
nginx: [emerg] cannot load certificate "/etc/nginx/certs/fullchain.pem": BIO_new_file() failed (SSL: error:02001002:system library:fopen:No such file or directory:fopen('/etc/nginx/certs/fullchain.pem','r') error:2006D080:BIO routines:BIO_new_file:no such file)
nginx: configuration file /etc/nginx/nginx.conf test failed
The certificates were generated outside of the docker container and mounted into nginx (so I might've done it wrong).
nginx:
container_name: best-nginx
build:
context: .
restart: always
image: nginx:alpine
volumes:
- ./nginx/default.conf:/etc/nginx/conf.d/default.conf
- /etc/letsencrypt/live/mycerts:/etc/nginx/certs
ports:
- "443:443"
default.conf
server {
root /usr/share/nginx/html;
index index.html index.htm index.nginx-debian.html;
server_name myservername.com;
location / {
try_files $uri $uri/ =404;
}
location /keycloak {
proxy_pass http://localhost:28080/;
}
listen [::]:443 ssl ipv6only=on; # managed by Certbot
listen 443 ssl; # managed by Certbot
ssl_certificate /etc/nginx/certs/fullchain.pem; # managed by Certbot
ssl_certificate_key /etc/nginx/certs/privkey.pem; # managed by Certbot
}
Dockerfile
# develop stage
FROM node:18-alpine as develop-stage
WORKDIR /app
COPY package*.json ./
COPY tsconfig.json ./
RUN npm install
COPY ./public ./public
COPY ./src ./src
# build stage
FROM develop-stage as build-stage
RUN npm run build
# production stage
FROM nginx:1.23.1-alpine as production-stage
COPY --from=build-stage /app/build /usr/share/nginx/html
CMD ["nginx", "-g", "daemon off;"]
What I observed is that certbot generates 4 files, while I'm using only 2 in my default.conf
Could that be the root of my problem?
Thanks.
//Edit:
The files exist in /etc/letsencrypt/live/mycerts but I can't access live/mycerts without root access. So I think they might be mapped weirdly?
Here's a ls -la in the docker container, in /etc/nginx/certs, and they look a bit strange.
lrwxrwxrwx 1 root root 45 Oct 7 10:20 cert.pem -> ../../archive/mycerts/cert1.pem
lrwxrwxrwx 1 root root 46 Oct 7 10:20 chain.pem -> ../../archive/mycerts/chain1.pem
lrwxrwxrwx 1 root root 50 Oct 7 10:20 fullchain.pem -> ../../archive/mycerts/fullchain1.pem
lrwxrwxrwx 1 root root 48 Oct 7 10:20 privkey.pem -> ../../archive/mycerts/privkey1.pem

Answer 1

you are mounting a folder with symbolic links, in you container you will get symbolic links that points to the same location, not real files.
So either you mount a directory with real cert files recommended
or mount archive/mycerts:/etc so symblic links points to real files inside the conatiner not recommended