Docker image build failure - wget - docker

Question

I have a docker file in which I do wget to copy something in the image. But the build is failing giving 'wget command not found'. WHen i googled I found suggestions to install wget like below
RUN apt update && apt upgrade
RUN apt install wget
Docker File:
FROM openjdk:17
LABEL maintainer="app"
ARG uname
ARG pwd
RUN useradd -ms /bin/bash -u 1000 user1
COPY . /app
WORKDIR /app
RUN ./gradlew build -PmavenUsername=$uname -PmavenPassword=$pwd
ARG YOURKIT_VERSION=2021.11
ARG POLARIS_YK_DIR=YourKit-JavaProfiler-2019.8
RUN wget https://www.yourkit.com/download/docker/YourKit-JavaProfiler-${YOURKIT_VERSION}-docker.zip --no-check-certificate -P /tmp/ && \
unzip /tmp/YourKit-JavaProfiler-${YOURKIT_VERSION}-docker.zip -d /usr/local && \
mv /usr/local/YourKit-JavaProfiler-${YOURKIT_VERSION} /usr/local/$POLARIS_YK_DIR && \
rm /tmp/YourKit-JavaProfiler-${YOURKIT_VERSION}-docker.zip
EXPOSE 10001
EXPOSE 8080
EXPOSE 5005
USER 1000
ENTRYPOINT ["sh", "/docker_entrypoint.sh"]
On doing this I am getting error app-get not found. Can some one suggest any solution.

Answer 1

The openjdk image you use is based on Oracle Linux which uses microdnf rather than apt as it's package manager.
To install wget (and unzip which you also need), you can add this to your Dockerfile:
RUN microdnf update \
&& microdnf install --nodocs wget unzip \
&& microdnf clean all \
&& rm -rf /var/cache/yum
The commands clean up the package cache after installing, to keep the image size as small as possible.