Introduction

For Dockerized Jenkins, we can use the following method to store/get sensitive data from AWS SSM instead of hardcoding it in Docker file

Store secret in AWS SSM:

aws ssm put-parameter –name “artifactory_password” –value “thisisapassword” –type ‚ÄúString”

In Dockerfile:

COPY settings.xml /etc/maven/settings.xml

COPY jenkins-slave /home/jenkins
RUN chmod -R 755 /home/jenkins/jenkins-slave

In settings.xml

<settings xmlns=”http://maven.apache.org/SETTINGS/1.0.0″ xmlns:xsi=”http://www.w3.org/2001/XMLSchema-instance” xsi:schemaLocation=”http://maven.apache.org/SETTINGS/1.0.0 http://maven.apache.org/xsd/settings-1.0.0.xsd”>
  <servers>
    <server>
      <id>artifactory_password</id>
      <username>username</username>
      <password>blank</password>
    </server>

</servers>
  <pluginGroups> <pluginGroup>com.amashchenko.maven.plugin.ondeck</pluginGroup>
  </pluginGroups>
</settings>

In jenkins-slave


#!/bin/bash


# The MIT License
#
#  Copyright (c) 2015, CloudBees, Inc.
#
#  Permission is hereby granted, free of charge, to any person obtaining a copy
#  of this software and associated documentation files (the “Software”), to deal
#  in the Software without restriction, including without limitation the rights
#  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
#  copies of the Software, and to permit persons to whom the Software is
#  furnished to do so, subject to the following conditions:
#
#  The above copyright notice and this permission notice shall be included in
#  all copies or substantial portions of the Software.
#
#  THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
#  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
#  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
#  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
#  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
#  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
#  THE SOFTWARE.


# take from https://github.com/cloudbees/jnlp-slave-with-java-build-tools-dockerfile/blob/master/jenkins-slave
# assumed that these env vars are present on the kubernetes slave


if [[ $# -eq 1 ]]; then


    # if `docker run` only has one arguments, we assume user is running alternate command like `bash` to inspect the image
    exec “$@”


else


    # if -tunnel is not provided try env vars
    if [[ “$@” != *”-tunnel “* ]]; then
        if [[ ! -z “$JENKINS_TUNNEL” ]]; then
            TUNNEL=”-tunnel $JENKINS_TUNNEL”        
        fi
    fi


    if [[ ! -z “$JENKINS_URL” ]]; then
        URL=”-url $JENKINS_URL”
    fi


    sed -i “s/blank/$(aws ssm get-parameters –region us-east-1 –with-decryption –names artifactory_password –query ‘Parameters[0].Value’ –output text )/” /etc/maven/settings.xml
   
    gosu jenkins java $JAVA_OPTS -Duser.home=/var/lib/jenkins -cp /home/jenkins/slave.jar hudson.remoting.jnlp.Main -headless $URL $JENKINS_SECRET $JENKINS_NAME “$@”
fi  

Configure home/jenkins/jenkins-slave as the entry point of the Jenkins container