Can you install command-line packages in jib docker image? - docker

Question

I need to install command line tools like jq, curl etc in the docker image created by maven jib plugin. How can I achieve this? Any help would be greatly appreciated. Thanks.

Answer 1

As explained in the other answer, using a base image customized with pre-installed tools that rarely change is a good solution.
Alternatively, you may put curl using Jib's <extraDirectories> feature, which enables adding arbitrary files to the target image. Check the Maven and Gradle docs for more details. As explained in the docs, you will also need to configure <permissions> to set executable bits to curl.
If you prefer, you could even set up your Maven or Gradle builds to download curl and unpack it. Here's an example Jib setup (showing both Maven and Gradle) from the Jib repository.

Answer 2

Adding a reference Dockerfile and you can build your own base image by creating your Dockerfile and then build it.
FROM openjdk:8-jdk-alpine
RUN apk add --no-cache curl tar bash procps
# Downloading and installing Maven
ARG MAVEN_VERSION=3.6.1
ARG USER_HOME_DIR="/root"
ARG SHA=b4880fb7a3d81edd190a029440cdf17f308621af68475a4fe976296e71ff4a4b546dd6d8a58aaafba334d309cc11e638c52808a4b0e818fc0fd544226d952544
ARG BASE_URL=https://apache.osuosl.org/maven/maven-3/${MAVEN_VERSION}/binaries
RUN mkdir -p /usr/share/maven /usr/share/maven/ref \
&& echo "Downlaoding maven" \
&& curl -fsSL -o /tmp/apache-maven.tar.gz ${BASE_URL}/apache-maven-${MAVEN_VERSION}-bin.tar.gz \
\
&& echo "Checking download hash" \
&& echo "${SHA} /tmp/apache-maven.tar.gz" | sha512sum -c - \
\
&& echo "Unziping maven" \
&& tar -xzf /tmp/apache-maven.tar.gz -C /usr/share/maven --strip-components=1 \
\
&& echo "Cleaning and setting links" \
&& rm -f /tmp/apache-maven.tar.gz \
&& ln -s /usr/share/maven/bin/mvn /usr/bin/mvn
ENV MAVEN_HOME /usr/share/maven
ENV MAVEN_CONFIG "$USER_HOME_DIR/.m2"
# Downloading and installing Gradle
# 1- Define a constant with the version of gradle you want to install
ARG GRADLE_VERSION=4.0.1
# 2- Define the URL where gradle can be downloaded from
ARG GRADLE_BASE_URL=https://services.gradle.org/distributions
# 3- Define the SHA key to validate the gradle download
# obtained from here https://gradle.org/release-checksums/
ARG GRADLE_SHA=d717e46200d1359893f891dab047fdab98784143ac76861b53c50dbd03b44fd4
# 4- Create the directories, download gradle, validate the download, install it, remove downloaded file and set links
RUN mkdir -p /usr/share/gradle /usr/share/gradle/ref \
&& echo "Downlaoding gradle hash" \
&& curl -fsSL -o /tmp/gradle.zip ${GRADLE_BASE_URL}/gradle-${GRADLE_VERSION}-bin.zip \
\
&& echo "Checking download hash" \
&& echo "${GRADLE_SHA} /tmp/gradle.zip" | sha256sum -c - \
\
&& echo "Unziping gradle" \
&& unzip -d /usr/share/gradle /tmp/gradle.zip \
\
&& echo "Cleaning and setting links" \
&& rm -f /tmp/gradle.zip \
&& ln -s /usr/share/gradle/gradle-${GRADLE_VERSION} /usr/bin/gradle
# 5- Define environmental variables required by gradle
ENV GRADLE_VERSION 4.0.1
ENV GRADLE_HOME /usr/bin/gradle
ENV GRADLE_USER_HOME /cache
ENV PATH $PATH:$GRADLE_HOME/bin
VOLUME $GRADLE_USER_HOME
CMD [""]
Ref:- https://docs.docker.com/engine/reference/builder/
Once your custom image is ready, push it to Registry and then reference it in jib in following manner.
mvn compile jib:build \
-Djib.from.image=customImage