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docker: mapping host uid and gid to user inisde container
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FROM debian:jessie | |
ENV USER=boatswain USER_ID=1000 USER_GID=1000 | |
# now creating user | |
RUN groupadd --gid "${USER_GID}" "${USER}" && \ | |
useradd \ | |
--uid ${USER_ID} \ | |
--gid ${USER_GID} \ | |
--create-home \ | |
--shell /bin/bash \ | |
${USER} | |
COPY user-mapping.sh / | |
RUN chmod u+x user-mapping.sh | |
ENTRYPOINT ["/user-mapping.sh"] |
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docker build -t imageName . | |
docker run --name uid-map --rm -ti -e UID=22222 -e GID=22222 imageName |
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#!/bin/bash | |
if [ -z "${USER}" ]; then | |
echo "We need USER to be set!"; exit 100 | |
fi | |
# if both not set we do not need to do anything | |
if [ -z "${UID}" -a -z "${GID}" ]; then | |
echo "Nothing to do here." ; exit 0 | |
fi | |
# reset user_?id to either new id or if empty old (still one of above | |
# might not be set) | |
USER_ID=${UID:=$USER_ID} | |
USER_GID=${GID:=$USER_GID} | |
usermod -u USER_ID ${USER} | |
groupmod -g USER_GID ${USER} | |
usermod -g USER_ID ${USER} | |
exec su - "${USER}" |
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