End-to-end example: MeCab

This topic walks you through a simple end-to-end example on how to build and use custom engines.

This section demonstrates how to customize the Cloudera AI base engine image to include the MeCab (a Japanese text tokenizer) library.

This is a sample Dockerfile that adds MeCab to the Cloudera AI base image.

# Dockerfile

FROM docker.repository.cloudera.com/cloudera/cdsw/engine:13-cml-2021.02-1
RUN rm /etc/apt/sources.list.d/*
RUN apt-get update && \
    apt-get install -y -q mecab \
                          libmecab-dev \
                          mecab-ipadic-utf8 && \
    apt-get clean && \
    rm -rf /var/lib/apt/lists/*
RUN cd /tmp && \
    git clone --depth 1 https://github.com/neologd/mecab-ipadic-neologd.git && \
    /tmp/mecab-ipadic-neologd/bin/install-mecab-ipadic-neologd -y -n -p /var/lib/mecab/dic/neologd && \
    rm -rf /tmp/mecab-ipadic-neologd
RUN pip install --upgrade pip
RUN pip install mecab-python==0.996

To use this image on your Cloudera AI project, perform the following steps.

Build a new image with the Dockerfile.

docker build --network=host -t <company-registry>/user/cdsw-mecab:latest . -f Dockerfile

Push the image to your company's Docker registry.
```
docker push <your-company-registry>/user/cdsw-mecab:latest
```
Whitelist the image, <your-company-registry>/user/cdsw-mecab:latest. Only a site administrator can do this.
Go to Admin > Engines and add <company-registry>/user/cdsw-mecab:latest to the list of whitelisted engine images.
Ask a project administrator to set the new image as the default for your project. Go to the project Settings, click Engines, and select company-registry/user/cdsw-mecab:latest from the dropdown.

You shall now be able to run this project on the customized MeCab engine.