1. U8
  2. U8 Docker images

U8 Docker images

To simplify using U8, the Docker images are provided for U8 as well as for some U8-based software.

Overview

The Universa Docker images are provided in the official Docker Hub repository. The whole Universa project area can be seen at hub.docker.com/r/universa. The following Docker images may be of interest to you:

These images are rebuilt automatically from the latest GitHub code.

Note: there are also other general Universa-related Docker images there; see the appropriate article for more details: Universa Docker images.

Docker prerequirements

To use Docker images, you need to install the Docker software itself. See the installation details at the official Docker site; below are some download shortcuts for your convenience.

If you are going to use Docker Compose, you may want to install it as well; see details here.

Images

universa/u8: JavaScript runtime engine

Usage

Note that if you want to execute some external JavaScript file using U8, you should bind the directory to the image (as in the examples below).

See help
docker run universa/u8
Selftest
docker run universa/u8 --selftest
Running some custom mytest.js app

Assuming the mytest.js file is present in the current directory, you need to run the image while mounting the directory, for the image to see it. In the example below, the current directory ($(pwd)) is mounted to the /src directory for the image, and the image is executed using the mounted path.

docker run \
    --mount type=bind,source="$(pwd)",target=/src \
    universa/u8 /src/mytest.js
Running the prepackaged apps

Some U8 JavaScript apps are available in the /u8scripts directory. They are prepackaged into the Docker image, too.

Running helloworld.js app
docker run universa/u8 /code/u8scripts/examples/helloworld.js

It should print Hello, world!.

Running helloworld_http.js app

To use some port-listening app (like helloworld_http.js), you need to expose/publish the port being listened:

docker run \
    --publish 127.0.0.1:8180:8080/tcp \
    universa/u8 /code/u8scripts/examples/helloworld_http.js

After this, the script will be available at http://127.0.0.1:8180/hello.

Directory structure

Here is a map of source directories, and their in-image counterparts:

Source path Image-mapped path
 …/jslib /code/jslib
 …/u8scripts /code/u8scripts

universa/node-u8: implementation of Universa Node on U8

Note: it is provided strictly as Early Access!

Usage

Use the following command to launch:

docker run universa/node-u8

Note that for proper execution, you’ll need to have PostgreSQL installed and reachable to the Docker container (you may need to add extra configuration); this may be either dedicated PostgreSQL setup or using the stock postgres Docker image from Docker Hub connected to the Docker container (probably, using Docker Compose).

Also you may need to specify the node configuration directory (and mount it to the Docker image).

universa/ubotserver: server for running UBots

Usage

  • Make a logs directory like logs (note it won’t be mounted to the image).
  • Make a config directory like ubot_config (and put the needed data in it, so it will be mountable into the image as /ubot_config; see the  …/test/config/ubot_config/ examples in GitHub); the ubot_config directory should contain subdirectories config and tmp.
  • Then run the following command:
docker run \
    --mount type=bind,source="$(pwd)/ubot_config",target=/ubot_config \
    universa/ubotserver \
    --config /ubot_config > logs/log.txt 2> logs/errlog.txt

Note that for proper execution, you’ll need to have PostgreSQL installed and reachable to the Docker container (you may need to add extra configuration); this may be either dedicated PostgreSQL setup or using the stock postgres Docker image from Docker Hub connected to the Docker container (probably, using Docker Compose).