Update README, add Docker section1.4.1

1 files changed, 84 insertions, 19 deletions

diff --git a/README.md b/README.md
index 67579d1..28a4e8a 100644
--- a/README.md
+++ b/README.md
@@ -9,36 +9,101 @@ It supports most german local transit networks and also some austrian ones.
 
 There's a public [vrr-infoscreen service on
 finalrewind.org](https://vrrf.finalrewind.org/). You can also host your own
-instance, see the Setup notes below.
+instance via carton/cpanminus or Docker, see the Setup notes below.
 
 ## Dependencies
 
- * perl ≥ 5.10
- * Cache::File (part of the Cache module)
- * DateTime
- * DateTime::Format::Strptime
- * File::ShareDir
- * GD
- * Mojolicious
- * Mojolicious::Plugin::BrowserDetect
- * Travel::Status::DE::EFA ≥ 1.15
- * Travel::Status::DE::HAFAS ≥ 2.03
- * Travel::Status::DE::URA ≥ 2.01
+ * perl ≥ 5.20
+ * carton or cpanminus
+ * build-essential (gcc/clang, make)
+ * libdb (Berkeley Database Libraries)
+ * libgd (GD Graphics Library)
+ * libxml2
+ * zlib
 
-## Setup
+## Installation
+
+After installing the dependencies, clone the repository using git, e.g.
+
+```
+git clone https://git.finalrewind.org/vrr-fakedisplay
+```
+
+Make sure that all files (including `.git`, which is used to determine the
+software version) are readable by your www user, and follow the steps in the
+next sections.
+
+## Perl Dependencies
+
+vrr-infoscreen depends on a set of Perl modules which are documented in
+`cpanfile`. After installing the dependencies mentioned above, you can use
+carton or cpanminus to install Perl depenencies locally.
+
+In the project root directory (where `cpanfile` resides), run either
+
+```
+carton install
+```
+
+or
+
+```
+cpanm -n --installdeps .
+```
+
+Next, you need to build App::VRR::Fakedisplay, which is required for the lED
+frontend and shipped with vrr-fakedisplay.
+
+```
+perl Build.PL
+./Build
+./Build manifest
+sudo ./Build install
+```
 
-First, build App::VRR::Fakedisplay which is required for the LED frontend:
+## Running
 
-* perl Build.PL
-* ./Build
-* ./Build manifest
-* sudo ./Build install
+You are now ready to start the web service. If you used carton, it boils
+down to
+
+```
+carton exec hypnotoad index.pl
+```
+
+Otherwise, you need to make the perl dependencies available by setting the
+PERL5LIB environment variable:
+
+```
+PERL5LIB=local/lib/perl5 local/bin/hypnotoad index.pl
+```
+
+Note that you should provide imprint and privacy policy pages. Depending on
+traffic volume, you may also want to increase the amount of worker processes.
+See the Setup notes below.
+
+## Installation with Docker
+
+A vrr-infoscreen image is available on Docker Hub. You can install and run it
+as follows:
+
+```
+docker pull derfnull/vrr-fakedisplay:latest
+docker run --rm -p 8000:8091 -v "$(pwd)/templates:/app/ext-templates:ro" vrr-fakedisplay:latest
+```
+
+This will make the web service available on port 8000.  Note that you should
+provide imprint and privacy policy pages, see the Setup notes below.
+
+Use `docker run -e VRRFAKEDISPLAY_WORKERS=4 ...` and similar to pass
+environment variables to the vrr-infoscreen service.
+
+## Setup
 
 vrr-infoscreen is configured via environment variables:
 
 | Variable | Default | Description |
 | :------- | :------ | :---------- |
-| VRRFAKEDISPLAY\_LISTEN | `http://127.0.0.1:8091` | IP and Port for web service |
+| VRRFAKEDISPLAY\_LISTEN | `http://*:8091` | IP and Port for web service |
 | VRRFAKEDISPLAY\_STATS | _None_ | File in which the total count of (non-cached) backend API requests is written |
 | VRRFAKEDISPLAY\_CACHE | `/tmp/vrr-fakedisplay` | Cache directory |
 | VRRFAKEDISPLAY\_WORKERS | 2 | Number of concurrent worker processes |