CODEWITHSUNDEEP
dockerdockerfile
fmanaa
fmanaa

Reputation: 184

Do the USER and WORKDIR instructions hold in downstream docker file?

I have 2 docker images, the first Dockerfile creates a user using:

RUN useradd -m newuser

then it switches to the user and workspace as follows:

USER newuser
WORKDIR /home/newuser/

The second docker file reads from the first image using the FROM statement.

Should the USER and WORKDIR instructions still hold in the second file without having to put them in again?

Upvotes: 3

Views: 5230

Answers (1)

Auzias
Auzias

Reputation: 3798

From this Dockerfile:

FROM debian:8

ENV HOME /home/user
RUN useradd --create-home --home-dir $HOME user \
    && mkdir -p $HOME \
    && chown -R user:user $HOME

WORKDIR $HOME
USER user

A build and a run later:

$docker build -t deb .
$docker run --rm deb bash -c "pwd && whoami"
/home/user
user

Now from this Dockerfile, based from the previous image:

FROM deb
ENTRYPOINT [ "sh" ]

Build and run:

$docker build -t debb .
$docker run --rm -it debb
[container]$ pwd && whoami
/home/user
user

So, yes the USER and the WORKDIR are inherited.

Client:
 Version:      1.10.3
 API version:  1.22
 Go version:   go1.5.3
 Git commit:   20f81dd
 Built:        Thu Mar 10 15:38:58 2016
 OS/Arch:      linux/amd64

Server:
 Version:      1.10.3
 API version:  1.22
 Go version:   go1.5.3
 Git commit:   20f81dd
 Built:        Thu Mar 10 15:38:58 2016
 OS/Arch:      linux/amd64

Upvotes: 9

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