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In docker linux, in order to set your default encoding, you need to set your locale via environment variable in your dockerfile

Example

Ubuntu

  • Check/ List the locales
locale -a

C
C.UTF-8
POSIX
  • If there is no locale, install them
apt-get install -y locales
# if you really want to have all locales :)
# apt-get install -y locales-all
  • Then in docker file
ENV LANG C.UTF-8
ENV LC_ALL C.UTF-8