The SSL certificates are obtained, and renewed from Let's Encrypt
Docker Hub page:
##Table of Contents
- See It Work
- Quick Start
- Advanced Usage
- How It Works
- About Rate Limits of Let's Encrypt
This project is in active development. Use it in production with CAUTION.
HTTPS-PORTAL is shipped as a Docker image. To use it, you need a Linux machine
(either local or remote host) which:
- Has 80 and 443 port available and exposed.
- Has Docker Engine installed.
In addition, Docker Compose is highly
recommended, for it makes your life easier. Examples in our documents are
mainly in Docker Compose format.
- Has all domains you're going to use in the following examples resolving to
Though it is good to have, knowledge about Docker is not required to use
See It Work
docker-compose.yml file with the following content in any directory
of your choice:
https-portal: image: steveltn/https-portal ports: - '80:80' - '443:443' environment: DOMAINS: 'example.com' # STAGE: 'production'
docker-compose up command in the same directory. A moment later you'll
have a welcome page running in
This is a more real-world example
docker-compose.yml, create it in another
https-portal: image: steveltn/https-portal ports: - '80:80' - '443:443' links: - wordpress restart: always environment: DOMAINS: 'wordpress.example.com -> http://wordpress' # STAGE: 'production' # FORCE_RENEW: 'true' wordpress: image: wordpress links: - db:mysql db: image: mariadb environment: MYSQL_ROOT_PASSWORD: '<a secure password>'
docker-compose up -d command. A moment later you'll get a WordPress
running on https://wordpress.example.com.
In the example above, only the environment variables under
section are HTTPS-PORTAL specific configurations. This time we added an extra
-d, it will tell Docker Compose to run the apps defined in
docker-compose.yml in background.
staging by default, which results in a test
(untrusted) certificate from Let's Encrypt.
You can test HTTPS-PORTAL with your application stack locally.
https-portal: # ... environment: STAGE: local DOMAINS: 'example.com'
When doing it, HTTPS-PORTAL will create a self-signed certificate.
This certificated is not likely to be trusted by your browser, but you can
use it to test your docker-compose file, make sure it works with your application
Note that HTTPS-PORTAL only listens to
example.com, as you specified in the compose file.
In order to make HTTPS-PORTAL respond to your connection, you need to either:
- modify your
hostsfile to have
example.comresolving to your docker host
- set up DNSMasq on your computer/router, this method provides more flexibility
Once you are done testing, you can deploy your application stack to the server.
Automatic Container Discovery
HTTPS-PORTAL is capable of discovering other Docker containers running on the
same host, as long as Docker API socket is accessible within the container.
In order to make it so, launch HTTPS-PORTAL using the following
Notice: Container discovery doesn't work with compose v2 syntax for now, because of an incompatibility between the
new network interface and docker-gen.
https-portal: # ... volumes: - /var/run/docker.sock:/var/run/docker.sock:ro
and launch one or more web applications with:
a-web-application: # ... ports: - '8080:80' environment: # tell HTTPS-PORTAL to set up "example.com" VIRTUAL_HOST: example.com
Note that here is no need to link your web service to HTTPS-PORTAL, and you shouldn't put
example.com in environment variable
DOMAINS of HTTP-PORTAL.
This feature allows you to deploy multiple web applications on the same host
without restarting HTTPS-PORTAL itself or interrupting other application while
adding/removing web applications.
If your web service has more than one port exposed (mind that ports can be exposed in your web service Dockerfile),
use environment variable
VIRTUAL_PORT to specify which port accepts HTTP request:
a-multi-port-web-application: # ... ports: - '8080:80' - '2222:22' environment: VIRTUAL_HOST: example.com VIRTUAL_PORT: '8080'
Of course container discovery works in combination with ENV specified domains:
https-portal: # ... volumes: - /var/run/docker.sock:/var/run/docker.sock:ro environment: DOMAINS: 'example.com -> http://upstream'
Hybrid Setup with Non-Dockerized Apps
Web applications that run directly on host machine instead of in Docker
containers are available at
For instance, if an application accepts HTTP requests on port 8080 of the host
machine, you can start HTTPS-PORTAL by:
https-portal: # ... environment: DOMAINS: 'example.com -> http://dockerhost:8080'
You can specify multiple domains by splitting them with commas:
https-portal: # ... environment: DOMAINS: 'wordpress.example.com -> http://wordpress, gitlab.example.com -> http://gitlab'
You can also specify the stage (
production) for each individual site, note that stages of individual sites overrides the global stage:
DOMAINS: 'wordpress.example.com -> http://wordpress #local, gitlab.example.com #production'
Serving Static Sites
Instead of forwarding requests to web applications, HTTPS-PORTAL can also serve
(multiple) static sites directly:
https-portal: # ... environment: DOMAINS: 'hexo.example.com, octopress.example.com' volumes: - /data/https-portal/vhosts:/var/www/vhosts
After HTTPS-PORTAL started, it will create corresponding sub-directories for
each virtual host in
/data/https-portal/vhosts directory on the host machine:
/data/https-portal/vhosts ├── hexo.example.com │ └── index.html └── octopress.example.com └── index.html
You can place your own static files in this directory hierarchy, they will not
be overwritten. You need an
index.html to be served as the homepage.
Share Certificates with Other Apps
You can mount an arbitrary host directory to
/var/lib/https-portal as a
https-portal: # ... volumes: - /data/ssl_certs:/var/lib/https-portal
Now your certificates are available in
/data/ssl_certs of your host.
Configure Nginx through Environment Variables
There are several additional environment variables that you can use to config Nginx.
They are coressponding to the configuration options that you would normally supply in
The following are the config keys with default values:
WORKER_PROCESSES=1 WORKER_CONNECTIONS=1024 KEEPALIVE_TIMEOUT=65 GZIP=on SERVER_TOKENS=off SERVER_NAMES_HASH_MAX_SIZE=512 SERVER_NAMES_HASH_BUCKET_SIZE=32 # defaults to 32 or 64 based on your CPU CLIENT_MAX_BODY_SIZE=1M # 0 disables checking request body size PROXY_BUFFERS="8 4k" # Either 4k or 8k depending on the platform PROXY_BUFFER_SIZE="4k" # Either 4k or 8k depending on the platform RESOLVER="Your custom solver string"
You can also add
to make HTTPS-PORTAL proxy WEBSOCKET connections.
Override Nginx Configuration Files
You can override default nginx settings by providing a config segment of
nginx.conf containing a valid
server block. The custom nginx configurations
are ERB templates and will be
rendered before usage.
For instance, to override both HTTPS and HTTP settings for
you can launch HTTPS-PORTAL by:
https-portal: # ... volumes: - /path/to/http_config:/var/lib/nginx-conf/my.example.com.conf.erb:ro - /path/to/https_config:/var/lib/nginx-conf/my.example.com.ssl.conf.erb:ro
Another example can be found here.
If you want to make an Nginx configuration that will be used by all sites, you can overwrite
/var/lib/nginx-conf/default.ssl.conf.erb. These two files will be propagated to each site if the site-specific configuration files are not provided.
How It Works
- obtains an SSL certificate for each of your subdomains from
- configures Nginx to use HTTPS (and force HTTPS by redirecting HTTP to HTTPS)
- sets up a cron job that checks your certificates every week, and renew them.
if they expire in 30 days.
About Rate Limits of Let's Encrypt
- 10 registrations per IP per 3 hours.
- 5 certificates per domain (not sub-domain) per 7 days.
The former is not usually a problem, however the latter could be, if you want
to apply certificates for multiple sub-domains on a single domain. Let's
Encrypt does support SAN certificates, however it requires careful planning
and is hard to automate. So in HTTPS-PORTAL we only deal with CN certificates.
HTTPS-PORTAL stores your certificates in a data volume and will not re-sign
certificates until 30 days before expiration if a valid certificate is found
(you can force renew certificates by using
FORCE_RENEW: 'true' environment
variable). However if you play around with the image a lot, you can hit the
limit. That's why
staging by default, and thus we use the
Let's Encrypt staging server. When you made your experiments and feel
everything is good, you can switch to production mode with
According to Let's Encrypt, the restrictions will be loosen as the beta goes.