How ro run sudo su - in Dockerfile

Question

I am trying to RUN sudo su - inside the Dockerfile and I get this error

/bin/sh: 1: sudo: not found

This is how my Dockerfile looks like:

FROM ubuntu:18.04
RUN sudo su - 
RUN apt update && install openjdk-8-jdk
RUN wget -q -O - https://pkg.jenkins.io/debian/jenkins.io.key | sudo apt-key add - && sudo sh -c  'echo deb http://pkg.jenkins.io/debian-stable binary/ > /etc/apt/sources.list.d/kenkins.list'
RUN apt update && apt install jenkins

RUN curl -fsSL get.docker.com | /bin/bash
RUN usermod -aG docker jenkins && systemctl restart jenkins

This error comes when I try to build it. docker build -t jenkins . Can someone help me?

Did you try doing apt update? I believe you're already running those commands as root and therefor there's no need for sudo. — Kārlis K., Jan 29 '20 at 16:24
Any reason to do that? This command seems not to be doing anything except for creating an extra layer without any useful effect. — Victor, Jan 29 '20 at 16:26
Yeah, unless your jenkins user needs sudo. You can check what user you're runni g those commands with the 'who' command. As in: RUN who If your jenkins user needs sudo, look into this - https://stackoverflow.com/a/25908200 — Kārlis K., Jan 29 '20 at 16:28
BTW, using systemctl is not recommend, the best practices tell that you will be better with a starting script that boots the inner server, instead of using a control service. — Victor, Jan 29 '20 at 16:43

score 2 · Answer 1 · answered Feb 02 '20 at 20:57

The dockerfile will run as a virtual "root" user by default, so there is no need to include any sudo command.

Since the example script contains no "-y" defaults it seems that you have simply typed the description for a manual installation into a script. This will never work. And well, in a container the application does also need to be on PID-1 which systemctl will not do.

After going through a basic tutorial on docker you will find out why.

score 1 · Answer 2 · answered Jan 29 '20 at 16:27

1

This command seems not to be doing anything except for creating an extra layer without any useful effect.

answered Jan 29 '20 at 16:27

Victor

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Fuji Komalan · Answer 3 · 2020-01-30T04:00:10.530

0

$ cat Dockerfile

FROM ubuntu:18.04
RUN apt-get update && apt-get install openjdk-8-jdk -y

If You want to change the use privilege use USER flag in Dockerfile

edited Jan 30 '20 at 04:00

answered Jan 30 '20 at 03:54

Fuji Komalan

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How ro run sudo su - in Dockerfile

3 Answers3