Self-signed certificate companion for Nginx-Proxy

WARNING ! Self-signed certificates should only be used on local projects !

self-signed-certificate-nginx-proxy-companion is a lightweight companion container for the nginx-proxy. It allows the creation of self-signed certificates automatically.

If you need to set Let's Encrypt certificates for production, see : acme-companion.

Features

Automatic creation self-signed certificates with a 10 years validity period (by default) using original nginx-proxy container.
Automatic creation of a certificate autority (CA) to trust your self-signed certificates

Usage

To use it with original nginx-proxy container you must declare 2 volumes :

/var/run/docker.sock (read only) to access docker socket
/etc/nginx/certs (writable) to create self-signed certificates

Example:

First start nginx with the 2 volumes declared:

$ docker run -d -p 80:80 -p 443:443 \
    --name nginx-proxy \
    -v /var/run/docker.sock:/tmp/docker.sock:ro \
    -v /path/to/certs:/etc/nginx/certs:ro \
    -v /etc/nginx/vhost.d \
    nginxproxy/nginx-proxy

Second start this container:

$ docker run -d \
    --name proxy-companion \
    -v /var/run/docker.sock:/var/run/docker.sock:ro \
    -v /path/to/certs:/etc/nginx/certs:rw \
    sebastienheyd/self-signed-proxy-companion

Then start any proxied containers with an additional env var SELF_SIGNED_HOST

$ docker run -d \
    --name example-app \
    -e "VIRTUAL_HOST=example.com.localhost,www.example.com.localhost,mail.example.com.localhost" \
    -e "SELF_SIGNED_HOST=example.com.localhost" \
    tutum/apache-php

Note : in this example SELF_SIGNED_HOST value example.com.localhost will cover *.example.com.localhost, you don't have to add all FQDN. See wildcard documentation.

With docker-compose :

First start nginx and companion with the 2 volumes declared:

version: '2'

services:
    proxy:
        container_name: proxy
        restart: always
        image: nginxproxy/nginx-proxy
        ports:
            - "80:80"
            - "443:443"
        volumes:
            - /var/run/docker.sock:/tmp/docker.sock:ro
            - ./vhost.d:/etc/nginx/vhost.d
            - ./certs:/etc/nginx/certs:ro
        networks:
            - proxy

    proxy-companion:        
        container_name: proxy-companion
        restart: always
        image: sebastienheyd/self-signed-proxy-companion
        volumes:
            - /var/run/docker.sock:/var/run/docker.sock:ro
            - ./certs:/etc/nginx/certs:rw

networks:
    proxy:
        external: true

Then start any proxied containers with an additional env var SELF_SIGNED_HOST

version: '2'

services:
    app:
        container_name: example-app
        image: tutum/apache-php:latest
        environment:
            VIRTUAL_HOST: "example.com.localhost,www.example.com.localhost,mail.example.com.localhost"
            SELF_SIGNED_HOST: "example.com.localhost"
        networks:
            - proxy

networks:
    proxy:
        external: true

Note : in this example SELF_SIGNED_HOST value example.com.localhost will cover *.example.com.localhost, you don't have to add all FQDN. See wildcard documentation.

Environment variables

Variable	Default value	Description
NGINX_PROXY_CONTAINER	proxy	nginxproxy/nginx-proxy container name
EXPIRATION	3650	Certificates validity period (in days)
DOCKER_HOST	unix:///var/run/docker.sock	Path to the docker sock in current container

Trust self-signed certificates

This will avoid you to see the alert "your connection is not private".

At the first launch of companion a CA certificate is generated. You will find ca.crt in your certs folder, this is your CA certificate.

There are several ways to import a CA certificate, here are two of them.

Chrome

For MacOS:

open Keychain Access
drag and drop ca.crt
double clik certificate (can be found by typing nginx in search box)
expand Trust in first dropdown select Always Trust

Other:

Go to : chrome://settings/certificates
Go to Authorities and import ca.crt
Check Trust the CA to identify websites

A quicker solution, but less secure, is to allow insecure certificates for *.localhost domains : chrome://flags/#allow-insecure-localhost

Firefox

Go to about:config#privacy or to about:preferences#privacy in newer versions
At the bottom of the page, click on View certificates, select Authorities > Import then browse to ca.crt.
Check Trust the CA to identify websites

sebastienheyd/docker-self-signed-proxy-companion