The LinuxServer.io team brings you another container release featuring easy user mapping and community support. Find us for support at:

forum.linuxserver.io
IRC on freenode at #linuxserver.io
Podcast covers everything to do with getting the most from your Linux Server plus a focus on all things Docker and containerisation!

linuxserver/letsencrypt

This container sets up an Nginx webserver and reverse proxy with php support and a built-in letsencrypt client that automates free SSL server certificate generation and renewal processes. It also contains fail2ban for intrusion prevention.

Usage

docker create \
  --cap-add=NET_ADMIN \
  --name=letsencrypt \
  -v <path to data>:/config \
  -e PGID=<gid> -e PUID=<uid>  \
  -e EMAIL=<email> \
  -e URL=<url> \
  -e SUBDOMAINS=<subdomains> \
  -p 443:443 \
  -e TZ=<timezone> \
  linuxserver/letsencrypt

Parameters

The parameters are split into two halves, separated by a colon, the left hand side representing the host and the right the container side. For example with a port -p external:internal - what this shows is the port mapping from internal to external of the container. So -p 8080:80 would expose port 80 from inside the container to be accessible from the host's IP on port 8080 http://192.168.x.x:8080 would show you what's running INSIDE the container on port 80.

-p 443 - the port(s)
-v /config - all the config files including the webroot reside here
-e URL - the top url you have control over ("customdomain.com" if you own it, or "customsubdomain.ddnsprovider.com" if dynamic dns)
-e SUBDOMAINS - subdomains you'd like the cert to cover (comma separated, no spaces) ie. www,ftp,cloud
-e PGID for GroupID - see below for explanation
-e PUID for UserID - see below for explanation
-e TZ - timezone ie. America/New_York

Optional settings:

-e EMAIL - your e-mail address for cert registration and notifications
-e DHLEVEL - dhparams bit value (default=2048, can be set to 1024 or 4096)
-p 80 - Port 80 forwarding is optional (cert validation is done through 443)
-e ONLY_SUBDOMAINS - if you wish to get certs only for certain subdomains, but not the main domain (main domain may be hosted on another machine and cannot be validated), set this to true
-e EXTRA_DOMAINS - additional fully qualified domain names (comma separated, no spaces) ie. extradomain.com,subdomain.anotherdomain.org

It is based on alpine linux with s6 overlay, for shell access whilst the container is running do docker exec -it letsencrypt /bin/bash.

User / Group Identifiers

Sometimes when using data volumes (-v flags) permissions issues can arise between the host OS and the container. We avoid this issue by allowing you to specify the user PUID and group PGID. Ensure the data volume directory on the host is owned by the same user you specify and it will "just work" ™.

In this instance PUID=1001 and PGID=1001. To find yours use id user as below:

  $ id <dockeruser>
    uid=1001(dockeruser) gid=1001(dockergroup) groups=1001(dockergroup)

Setting up the application

Before running this container, make sure that the url and subdomains are properly forwarded to this container's host, and that port 443 is not being used by another service on the host (NAS gui, another webserver, etc.).
Port 443 on the internet side of the router should be forwarded to this container's port 443 (Required for letsencrypt validation)
--cap-add=NET_ADMIN is required for fail2ban to modify iptables
If you need a dynamic dns provider, you can use the free provider duckdns.org where the url will be yoursubdomain.duckdns.org and the subdomains can be www,ftp,cloud
The container detects changes to url and subdomains, revokes existing certs and generates new ones during start. It also detects changes to the DHLEVEL parameter and replaces the dhparams file.
If you'd like to password protect your sites, you can use htpasswd. Run the following command on your host to generate the htpasswd file docker exec -it letsencrypt htpasswd -c /config/nginx/.htpasswd <username>

Info

Shell access whilst the container is running: docker exec -it letsencrypt /bin/bash
To monitor the logs of the container in realtime: docker logs -f letsencrypt
container version number

docker inspect -f '{{ index .Config.Labels "build_version" }}' letsencrypt

image version number

docker inspect -f '{{ index .Config.Labels "build_version" }}' linuxserver/letsencrypt

Versions

25.09.2017: Manage fail2ban via s6
24.09.2017: Add memcached service
01.09.2017: --privileged is no longer required as long as --cap-add=NET_ADMIN is added, instructions modified accordingly, disabled fail2ban ipv6 actions due to requiring access to host kernel modules
31.08.2017: Add php7-phar
14.07.2017: Enable modules dynamically in nginx.conf
06.07.2017: Add support for multiple domains (thanks @oznu)
22.06.2017: Add various nginx modules and enable all modules in the default nginx.conf
16.06.2017: Update deprecated certbot option for https validation, make e-mail entry optional, update readme
05.06.2017: Add php7-bz2
27.05.2017: Rebase to alpine 3.6.
03.05.2017: Fix log permissions.
18.04.2017: Add php7-sockets, update fail2ban filter and action defaults
27.02.2017: Add php7-dom, php7-iconv and php7-pdo_sqlite
21.02.2017: Add php7-xml
10.02.2017: Switch to alpine 3.5 base and php7, add php zlib module and all nginx modules
13.01.2017: Add php5-ctype and php5-openssl
04.01.2017: Add php5-mysqli and php5-pdo_mysql
22.11.2016: Add gd and mcrypt packages
21.11.2016: Add curl package
07.11.2016: Initial Release