Dockerfile for Slave Agent

docker-entrypoint.sh

#!/bin/sh
set -e

if [ "${1#-}" != "$1" ]; then
	set -- docker "$@"
fi

if docker help "$1" > /dev/null 2>&1; then
	set -- docker "$@"
fi

if [ -z "$DOCKER_HOST" -a "$DOCKER_PORT_2375_TCP" ]; then
	export DOCKER_HOST='tcp://docker:2375'
fi

exec "$@"

Dockerfile

FROM jenkins/jnlp-agent-docker

USER root

RUN apk update && \ 
apk add -u libcurl curl && \
apk add --no-cache libc6-compat bash openssh-client git python2 py-pip ansible && \
rm -rf /tmp/* && \
rm -rf /var/cache/apk/*

USER jenkins