Public | Automated Build

Last pushed: a year ago
Short Description
Allows running locally
Full Description



This docker image is to allow running locally. Here are the image's limitations:

  • It is not updated often, so is always more up to date. (But see below on how to update individual languages)
  • The image as of the time of writing is about 4GB in size, so it can take some time to download depending on your connection speed
  • The image takes about 2 hours to build (again, depending on your machine spec) - you don't have to build it though, you can download it (as above)
  • Since TryItOnline security is based on SELinux, and it is not possible to run SELinux specific commands inside a docker container, SELinux is disabled in this image. This means, that if someone can browse to the web site served by this image, they are a root inside the docker container and can potentially compromise the host. !!!Do not expose installations based on this image to any non-trusted environment (e.g.: internet)!!!
  • Dyalog APL is not included in the image. If you would like to use Dyalog APL, you'll have to copy the installation rpms into the container and install them with dnf. (See below)

This image was tested to run fine on both Windows (Windows 10) and Linux (Ubuntu 16.04).

Getting the image

You can build the image yourself. Run in the root of the repo:

docker build --no-cache=true -t tryitonline/tryitoffline .

Or download from docker hub:

docker pull tryitonline/tryitoffline

Running the image

First add the following to your hosts file: tryitonline tiorun

When you put the host records your computer starts resolving domain names as per the record configured, so tryitonline will resolve to The web server uses the host header to select the site to serve. The host header is what you specify in the domain part off the url, which is in this case "tryitonline"
The image configured to recognize "tryitonline" for the static site "e.g." and tiorun for the dynamic part (e.g ""), this can be changed in the apache configuration (/etc/httpd inside the container). Note: As of June 2017, and were merged to a single site with redirecting to

The hosts file is usually at C:\Windows\System32\drivers\etc\hosts on Windows or /etc/hosts on Linux.

Then start the container:

docker run -d --name tiooffline -p 80:80 --add-host arena: tryitonline/tryitoffline

Now browse to http://tryitonline, that's it.


You already know the below if you are familiar with docker, but if not, here is a few useful commands. This allows you to connect to the container's shell:

docker exec -it tiooffline /bin/bash

To stop the container use:

docker stop tiooffline

To start the container again use:

docker start tiooffline

To remove container use:

docker container rm -f tiooffline

To remove image use:

docker image rm tryitonline/tryitoffline

In the image there are volumes for /srv (web sites contents) and /etc/httpd (web sites configuration) are defined. You can either use docker run switch -v to map them where ever you like on the host file system, or use docker container inspect tiooffline to see where docker mapped them by default. Please refer to docker documentation for more details. You might want to change httpd configuration and/or sites contents if you want them to be served, say on different ports of localhost.

For quick test of all languages you can use:


inside container shell. (Depending on your hardware it can take around 2 minutes to finish).


It is generally recommended pulling tryitonline/tryitoffline:tested from Docker Hub, since it is usually minimally tested. If you build your own image and it does not work (which is most often happens because of network connectivity problems) here are a few ways to diagnose.

You can delete your old container with docker container rm -f tiooffline then create a new one without trying to start tryitonline, but just with bash to access the build logs docker run -it tryitonline/tryitoffline /bin/bash the logs are then in /var/log/tioupd

Another way to diagnose it is to remove the container as above and then run it like this: docker run -it --name tiooffline -p 80:80 --add-host arena: tryitonline/tryitoffline this will produce some start up output and possibly some errors that could help.

Updating languages

Some languages updates are tricky, but some languages (listed here) can be updated relatively easily from the command line. Run:

docker exec -it tiooffline /bin/bash

to drop into container, then run, for example, to update jelly:

tiopull jelly

Also some languages may be updated by running dnf update.

If a new language needs to be added to the image, in might be easier to rebuild the image. That will pull all the languages from tiosetup.

Adding Dyalog APL (also: classic, quadr, quads)

If you have Dialog APL installation rpms, you can copy them into your container:

docker cp linux_64_15.0.29644_unicode.x86_64.rpm tiooffline:/opt/linux_64_15.0.29644_unicode.x86_64.rpm

Then drop into the container and install it as usual:

docker exec -it tiooffline /bin/bash
dnf install /opt/linux_64_15.0.29644_unicode.x86_64.rpm

You need to repeat the same process for classic version, if you want both of them running.

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