janus-ci-cd/jenkins/Dockerfile

FROM jenkins/jenkins:lts
LABEL maintainer="apotwohd@gmail.com"

USER root

# Preps Jenkins directories
RUN mkdir /var/log/jenkins
RUN mkdir /var/cache/jenkins
RUN chown -R jenkins:jenkins /var/log/jenkins
RUN chown -R jenkins:jenkins /var/cache/jenkins

# Installs docker inside container
# ATENTION: version MUST be the same as host's docker installation!
ARG HOST_DOCKER_VERSION
RUN apt update && apt install -y \
    apt-transport-https \
    ca-certificates \
    curl \
    gnupg-agent \
    software-properties-common
RUN curl -fsSL https://download.docker.com/linux/debian/gpg | sudo apt-key add -
RUN sudo add-apt-repository \
       "deb [arch=amd64] https://download.docker.com/linux/debian \
       $(lsb_release -cs) \
       stable"
RUN apt update && apt install "docker-ce=$HOST_DOCKER_VERSION" "docker-ce-cli=$HOST_DOCKER_VERSION"

# Installs tools needed when installing npm packages
RUN apt install -y build-essential

# Generates an SSH key-pair to use with Gitlab
# TODO: replace placeholder email (note that this is not really necessary)
RUN mkdir -p "/home/jenkins/.ssh"
RUN ssh-keygen -t ed25519 -C "example@email.com" -N "" -f "/home/jenkins/.ssh/gitlab-ssh"

USER jenkins

# Security configuration scripts
COPY configuration/* /var/jenkins_home/init.groovy.d/

# Automatically installs plugins
COPY plugins.txt /usr/share/jenkins/ref/plugins.txt
RUN /usr/local/bin/install-plugins.sh < /usr/share/jenkins/ref/plugins.txt

# Adds job configurations for apella
COPY jobs/. /var/jenkins_home/jobs/

# Sets defaults
# Gets rid of admin password setup
ENV JAVA_OPTS="-Djenkins.install.runSetupWizard=false -Xmx8192m"
ENV JENKINS_OPTS="--handlerCountMax=300 --logfile=/var/log/jenkins/jenkins.log --webroot=/var/cache/jenkins/war"