[SOLVED] yum -y install not assuming yes in docker build

Issue

I'm trying to simply create a dockerfile that installs wget and unzip on a centOS image. This is the file:

FROM centos:latest

EXPOSE 9000

RUN echo "proxy=http://xxx.xxx.xxx.xxx:x" >> /etc/yum.conf \
    && echo "proxy_username=username" >> /etc/yum.conf \
    && echo "proxy_password=password" >> /etc/yum.conf \
    && yum update \
    && yum -y install wget unzip
...

When I run the build it resolves the dependencies just fine but it doesn't seem to be honoring the -y flag and assuming yes for any prompts:

Total download size: 61 M
Is this ok [y/d/N]: Exiting on user command
Your transaction was saved, rerun it with:
yum load-transaction /tmp/yum_save_tx.2018-08-08.21-22.Q7f8LW.yumtx
The command '/bin/sh -c yum update     && yum -y install wget unzip' returned 
a non-zero code: 1

I've used the -y flag in this situation many times and have never had any trouble. It doesn't seem like this could be a caching issue but I have no idea what's going on. I also tried yum install -y wget unzip just for good measure but still no luck (as expected). I've searched stackoverflow but it seems like anyone with the same issue just wasn't using the -y flag. Any guidance would be appreciated because I don't know what could be going wrong with such a simple file.

Solution

It looks like you're missing the -y on the yum update.

Also, you should split those commands out to separate RUN commands. In this case, it doesn't make too much difference, but splitting the echos onto different lines will make it clearer.

You should keep the update and installs in the same command though

https://docs.docker.com/develop/develop-images/dockerfile_best-practices/#run

Answered By - Daniel Scott

Answer Checked By - Pedro (WPSolving Volunteer)