How to run wget inside Ubuntu Docker image?

Question

I'm trying to download a Debian package inside a Ubuntu container as follows:

sudo docker run ubuntu:14.04 wget https://downloads-packages.s3.amazonaws.com/ubuntu-14.04/gitlab_7.8.2-omnibus.1-1_amd64.deb 

I get

exec: "wget": executable file not found in $PATH 

I've already installed wget with docker as follows:

run ubuntu:14.04 apt-get install wget 

How can I download a file?

Answer 1

You need to install it first. Create a new Dockerfile, and install wget in it:

FROM ubuntu:14.04 RUN  apt-get update \   && apt-get install -y wget \   && rm -rf /var/lib/apt/lists/* 

Then, build that image:

docker build -t my-ubuntu . 

Finally, run it:

docker run my-ubuntu wget https://downloads-packages.s3.amazonaws.com/ubuntu-14.04/gitlab_7.8.2-omnibus.1-1_amd64.deb 

Answer 2

I had this problem recently where apt install wget does not find anything. As it turns out apt update was never run.

apt update apt install wget 

After discussing this with a coworker we mused that apt update is likely not run in order to save both time and space in the docker image.