sudo: you do not exist in the passwd database

Tarasovych

12/31/22, 11:24 AM

What do I have:

FROM ubuntu:20.04

ENV DEBIAN_FRONTEND=noninteractive

RUN apt update -y \
    && apt install -y --no-install-recommends \
    sudo \
    && adduser --disabled-password --gecos "" --uid 1000 runner \
    && groupadd docker \
    && usermod -aG sudo runner \
    && usermod -aG docker runner \
    && echo "%sudo   ALL=(ALL:ALL) NOPASSWD:ALL" > /etc/sudoers

USER runner

RUN sudo usermod -u 1001 runner && sudo groupmod -g 121 runner

Building this Dockerfile results in an error:

sudo: you do not exist in the passwd database

If I split the last one RUN into two RUNs, there is no error:

FROM ubuntu:20.04

ENV DEBIAN_FRONTEND=noninteractive

RUN apt update -y \
    && apt install -y --no-install-recommends \
    sudo \
    && adduser --disabled-password --gecos "" --uid 1000 runner \
    && groupadd docker \
    && usermod -aG sudo runner \
    && usermod -aG docker runner \
    && echo "%sudo   ALL=(ALL:ALL) NOPASSWD:ALL" > /etc/sudoers

USER runner

RUN sudo usermod -u 1001 runner
RUN sudo groupmod -g 121 runner

Why is this happening?

2869

1 + 0

docker

20.04

Score:2

Ubuntu

muru

12/31/22, 2:02 PM

In RUN sudo usermod -u 1001 runner && sudo groupmod -g 121 runner, Docker starts an sh process as the runner user, that runs these commands. The first command changes the UID of that user. But the sh process still uses the old ID, and so, when it tries to run the second command, it is trying to run sudo with a UID that no longer exists in the passwd database. When you split them into two RUN commands, Docker starts a new sh process for the second RUN, which uses the new UID.

I don't have a solution for this, since I don't know why you're doing something like this. I'd advice against randomly changing UIDs of a user while still running processes as that user. sudo isn't the only tool that won't like it.

0 + 0

Score:0

Ubuntu

Stephen Warren

8/29/24, 11:02 PM

You probably want to put the USER statement after all the RUN statements, and remove sudo from those commands. That way, the modifications to the user's account all happen as root, and so are unaffected by the changes.

+ 0

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: sudo: you do not exist in the passwd database

TH: sudo: คุณไม่มีอยู่ในฐานข้อมูล passwd

RO: sudo: nu existați în baza de date passwd

RU: sudo: вас нет в базе данных passwd

VI: sudo: bạn không tồn tại trong cơ sở dữ liệu passwd

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