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How to add users to Docker container?

I tried adding RUN adduser uwsgi and RUN adduser celery to my Dockerfile, but this is causing problems, since these commands prompt for input (I've posted the responses from the build below).

Here is the output from the Dockerfile when the adduser commands are run:


Adding user `uwsgi' ...

Adding new group `uwsgi' (1000) ... 

Adding new user `uwsgi' (1000) with group `uwsgi' ... 

Creating home directory `/home/uwsgi' ...

Copying files from `/etc/skel' ... 

[91mEnter new UNIX password: Retype new UNIX password: [0m 

[91mpasswd: Authentication token manipulation error

passwd: password unchanged

[0m 

[91mUse of uninitialized value $answer in chop at /usr/sbin/adduser line 563.

[0m 

[91mUse of uninitialized value $answer in pattern match (m//) at /usr/sbin/adduser line 564.

[0m 

Try again? [y/N] 

Changing the user information for uwsgi

Enter the new value, or press ENTER for the default

    Full Name []: 

Room Number []:     Work Phone []:  Home Phone []:  Other []: 

[91mUse of uninitialized value $answer in chop at /usr/sbin/adduser line 589.

[0m 

[91mUse of uninitialized value $answer in pattern match (m//) at /usr/sbin/adduser line 590.

[0m 

Is the information correct? [Y/n] 

---> 258f2f2f13df 

Removing intermediate container 59948863162a 

Step 5 : RUN adduser celery 

---> Running in be06f1e20f64 

Adding user `celery' ...

Adding new group `celery' (1001) ... 

Adding new user `celery' (1001) with group `celery' ... 

Creating home directory `/home/celery' ...

Copying files from `/etc/skel' ... 

[91mEnter new UNIX password: Retype new UNIX password: [0m 

[91mpasswd: Authentication token manipulation error

passwd: password unchanged

[0m 

[91mUse of uninitialized value $answer in chop at /usr/sbin/adduser line 563.

[0m 

[91mUse of uninitialized value $answer in pattern match (m//) at /usr/sbin/adduser line 564.

[0m 

Try again? [y/N] 

Changing the user information for celery

Enter the new value, or press ENTER for the default

    Full Name []:   Room Number []:     Work Phone []: 

Home Phone []:  Other []: 

[91mUse of uninitialized value $answer in chop at /usr/sbin/adduser line 589.

[0m 

[91mUse of uninitialized value $answer in pattern match (m//) at /usr/sbin/adduser line 590.

[0m 

Is the information correct? [Y/n]
dockerfile ubuntu linux
by

3 Answers

espadacoder11
The trick is to use useradd instead of its interactive wrapper adduser. I usually create users with:


RUN useradd -ms /bin/bash newuser

which creates a home directory for the user and ensures that bash is the default shell.

You can then add:


USER newuser

WORKDIR /home/newuser

to your dockerfile. Every command afterwards as well as interactive sessions will be executed as user newuser:


docker run -t -i image

newuser@131b7ad86360:~$

You might have to give newuser the permissions to execute the programs you intend to run before invoking the user command.

Using non-privileged users inside containers is a good idea for security reasons. It also has a few drawbacks. Most importantly, people deriving images from your image will have to switch back to root before they can execute commands with superuser privileges.
pankajshivnani123
To avoid the interactive questions by adduser, you can call it with these parameters:

RUN adduser --disabled-password --gecos '' newuser

The --gecos parameter is used to set the additional information. In this case it is just empty.

On systems with busybox (like Alpine), use

RUN adduser -D -g '' newuser

See busybox adduser
kshitijrana14
Add this line to your Dockerfile (You can run any linux command this way)
RUN useradd -ms /bin/bash yourNewUserName

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