How to change languages of mysql in Dockerfile

My software’s language had to be switched from English to Japanese in Docker mysql. My server is ubuntu.

Conclusion

# Dockerfile
RUN apt-get update && apt-get install -y locales \ 
  && sed -i -e 's/# \(ja_JP.UTF-8\)/\1/' /etc/locale.gen \
  && locale-gen \
  && update-locale LANG=ja_JP.UTF-8

It is possible to replace characters by using sed command and specify the file (in this case, it is the locale.gen file). The locales must be installed.

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