Docker nginx error: openssl: command not found - docker

Question

I am using nginx as a proxy to forward requests to other components (servers).
Each component, including nginx is implemented as docker container, i.e. I have a docker container for 'nginx-proxy', 'dashboard-server', 'backend-server' (REST API), and 'landing-server' (Landing Page). The latter 3 components are all NodeJS Express servers and working properly when I use the command docker-compose build there are no errors but when I start the containers with docker-compose -f docker-compose.yml -f docker-compose.prod.yml up -d the NodeJS containers work fine, but the nginx container gives me this error using docker-compose logs nginx-proxy:
Attaching to docker_nginx-proxy_1
nginx-proxy_1 | /start.sh: line 5: openssl: command not found
nginx-proxy_1 | Creating dhparams…\c
nginx-proxy_1 | ok
nginx-proxy_1 | Starting nginx…
nginx-proxy_1 | 2017/08/23 23:27:20 [emerg] 6#6:
BIO_new_file(“/etc/letsencrypt/live/admin.domain.com/fullchain.pem”)
failed (SSL: error:02001002:system library:fopen:No such file or directory:
fopen(‘/etc/letsencrypt/live/admin.domain.com/fullchain.pem’,‘r’) error:2006D080:BIO routines:BIO_new_file:no such file)
nginx-proxy_1 | nginx: [emerg]
BIO_new_file(“/etc/letsencrypt/live/admin.domain.com/fullchain.pem”) failed (SSL: error:02001002:system library:fopen:
No such file or directory:fopen(‘/etc/letsencrypt/live/admin.domain.com/fullchain.pem’,‘r’)error:2006D080:BIO routines:BIO_new_file:no such file)
I am using Lets Encrypt for the SSL certificates, however the command certbot certonly --webroot -w /var/www/letsencrypt -d admin.domain.com -d api.domain.com -d www.domain.com -d domain.com results in the error Connection Refused because the nginx server does not start to handle the requests.
My nginx Dockerfile (nginx-proxy/Dockerfile):
FROM nginx:1.12
COPY start.sh /start.sh
RUN chmod u+x /start.sh
COPY conf.d /etc/nginx/conf.d
COPY sites-enabled /etc/nginx/sites-enabled
ENTRYPOINT ["/start.sh"]
My start.sh file (nginx-proxy/start.sh):
#!/bin/bash
if [ ! -f /etc/nginx/ssl/dhparam.pem ]; then
echo "Creating dhparams…\c"
openssl dhparam -out /etc/nginx/ssl/dhparam.pem 2048
echo "ok"
fi
echo "Starting nginx…"
nginx -g 'daemon off;
My default.conf file (nginx-proxy/conf.d/default.conf):
include /etc/nginx/sites-enabled/*.conf;
My api.conf file (the others are similar) (nginx-proxy/sites-enabled/api.conf):
server {
listen 80;
server_name api.domain.com;
location ^~ /.well-known/acme-challenge/ {
default_type "text/plain";
root /var/www/letsencrypt;
}
location = /.well-known/acme-challenge/ {
return 404;
}
return 301 https://$host$request_uri;
}
server {
listen 443;
server_name api.domain.com;
ssl on;
ssl_certificate /etc/letsencrypt/live/api.domain.com/fullchain.pem;
ssl_certificate_key /etc/letsencrypt/live/api.domain.com/privkey.pem;
ssl_session_timeout 5m;
ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
ssl_ciphers 'EECDH+AESGCM:EDH+AESGCM:AES256+EECDH:AES256+EDH';
ssl_prefer_server_ciphers on;
ssl_session_cache shared:SSL:1m;
ssl_dhparam /etc/nginx/ssl/dhparam.pem;
client_max_body_size 0;
chunked_transfer_encoding on;
location ^~ /.well-known/acme-challenge/ {
default_type "text/plain";
root /var/www/letsencrypt;
}
location = /.well-known/acme-challenge/ {
return 404;
}
location / {
proxy_read_timeout 900;
proxy_pass_header Server;
proxy_cookie_path ~*^/.* /;
proxy_pass http://backend-server:3000;
proxy_set_header Host $http_host;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Port $server_port;
proxy_set_header X-Forwarded-Proto $http_x_forwarded_proto;
}
}
Any ideas?

Answer 1

I found the solution.
In my nginx Dockerfile, I had to use
FROM nginx:1.12-alpine
RUN apk update \
&& apk add openssl
...
Then the openssl command worked properly.

Answer 2

At first, you can try edit your start.sh file at line openssl to /usr/bin/openssl. Did /usr/bin/openssl exists?
Second, your nginx server will not start until /etc/letsencrypt/live/api.domain.com/fullchain.pem and /etc/letsencrypt/live/api.domain.com/privkey.pem file exists.
So delete or comment all the server block that handling 443 port, keep server block that handling 80 port. Your api.conf will become this:
server {
listen 80;
server_name api.domain.com;
location ^~ /.well-known/acme-challenge/ {
default_type "text/plain";
root /var/www/letsencrypt;
}
location = /.well-known/acme-challenge/ {
return 404;
}
return 301 https://$host$request_uri;
}
Then start your nginx server and retry install Let's Encrypt certificate.