Dockerfile_alpine

# 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.

FROM java:8-jdk-alpine

ENV PATH=/usr/local/bin:/usr/bin:$PATH \
    HOME=/home/jenkins

COPY ./wrapdocker /usr/local/bin/wrapdocker
COPY ./jenkins-slave /usr/local/bin/jenkins-slave

RUN apk --update add \
    sudo \
    bash \
    iptables \
    ca-certificates \
    e2fsprogs \
    docker \
    curl \
    && chmod +x /usr/local/bin/wrapdocker \
    && chmod +x /usr/local/bin/jenkins-slave \
    && curl --create-dirs -sSLo /usr/share/jenkins/slave.jar http://repo.jenkins-ci.org/public/org/jenkins-ci/main/remoting/2.52/remoting-2.52.jar \
    && chmod 755 /usr/share/jenkins \
    && chmod 644 /usr/share/jenkins/slave.jar \
    && rm -rf /var/cache/apk/* \
    && addgroup -g 1000 jenkins \
    && adduser -D -g jenkins -G docker -u 1000 -h $HOME jenkins \
    && echo "jenkins ALL=(ALL) NOPASSWD: ALL" >> /etc/sudoers

VOLUME /var/lib/docker
VOLUME /home/jenkins
WORKDIR /home/jenkins
USER jenkins

ENTRYPOINT ["jenkins-slave"]

Dockerfile_ubuntu

# 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.

FROM ubuntu:14.04

ENV HOME=/home/jenkins \
    JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64

COPY ./wrapdocker /usr/local/bin/wrapdocker
COPY ./jenkins-slave /usr/local/bin/jenkins-slave

RUN apt-get update -qq && apt-get install -qqy \
    sudo \
    apt-transport-https \
    ca-certificates \
    curl \
    lxc \
    iptables \
    software-properties-common \
    python-software-properties \
    && add-apt-repository ppa:openjdk-r/ppa \
    && apt-get update -qq && apt-get install -qqy openjdk-8-jdk \
    && chmod +x /usr/local/bin/wrapdocker \
    && chmod +x /usr/local/bin/jenkins-slave \
    && curl -sSL https://get.docker.com/ | sh \
    && curl --create-dirs -sSLo /usr/share/jenkins/slave.jar http://repo.jenkins-ci.org/public/org/jenkins-ci/main/remoting/2.52/remoting-2.52.jar \
    && chmod 755 /usr/share/jenkins \
    && chmod 644 /usr/share/jenkins/slave.jar \
    && groupadd -g 1000 jenkins \
    && useradd -u 1000 -g jenkins -G docker -c "Jenkins user" -d $HOME -m jenkins \
    && echo "jenkins ALL=(ALL) NOPASSWD: ALL" >> /etc/sudoers \
    && rm -rf /var/lib/apt/lists/*

VOLUME /var/lib/docker
VOLUME /home/jenkins
WORKDIR /home/jenkins
USER jenkins

ENTRYPOINT ["jenkins-slave"]

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.

# Usage jenkins-slave.sh [options] -url http://jenkins SECRET SLAVE_NAME
# Optional environment variables :
# * JENKINS_TUNNEL : HOST:PORT for a tunnel to route TCP traffic to jenkins host, when jenkins can't be directly accessed over network
# * JENKINS_URL : alternate jenkins URL

sudo wrapdocker &

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

    exec java $JAVA_OPTS -cp /usr/share/jenkins/slave.jar hudson.remoting.jnlp.Main -headless $TUNNEL $URL "$@"
fi

wrapdocker

#!/bin/bash

# Ensure that all nodes in /dev/mapper correspond to mapped devices currently loaded by the device-mapper kernel driver
dmsetup mknodes

# First, make sure that cgroups are mounted correctly.
CGROUP=/sys/fs/cgroup
: {LOG:=stdio}

[ -d $CGROUP ] ||
	mkdir $CGROUP

mountpoint -q $CGROUP ||
	mount -n -t tmpfs -o uid=0,gid=0,mode=0755 cgroup $CGROUP || {
		echo "Could not make a tmpfs mount. Did you use --privileged?"
		exit 1
	}

if [ -d /sys/kernel/security ] && ! mountpoint -q /sys/kernel/security
then
    mount -t securityfs none /sys/kernel/security || {
        echo "Could not mount /sys/kernel/security."
        echo "AppArmor detection and --privileged mode might break."
    }
fi

# Mount the cgroup hierarchies exactly as they are in the parent system.
for SUBSYS in $(cut -d: -f2 /proc/1/cgroup)
do
        [ -d $CGROUP/$SUBSYS ] || mkdir $CGROUP/$SUBSYS
        mountpoint -q $CGROUP/$SUBSYS ||
                mount -n -t cgroup -o $SUBSYS cgroup $CGROUP/$SUBSYS

        # The two following sections address a bug which manifests itself
        # by a cryptic "lxc-start: no ns_cgroup option specified" when
        # trying to start containers withina container.
        # The bug seems to appear when the cgroup hierarchies are not
        # mounted on the exact same directories in the host, and in the
        # container.

        # Named, control-less cgroups are mounted with "-o name=foo"
        # (and appear as such under /proc/<pid>/cgroup) but are usually
        # mounted on a directory named "foo" (without the "name=" prefix).
        # Systemd and OpenRC (and possibly others) both create such a
        # cgroup. To avoid the aforementioned bug, we symlink "foo" to
        # "name=foo". This shouldn't have any adverse effect.
        echo $SUBSYS | grep -q ^name= && {
                NAME=$(echo $SUBSYS | sed s/^name=//)
                ln -s $SUBSYS $CGROUP/$NAME
        }

        # Likewise, on at least one system, it has been reported that
        # systemd would mount the CPU and CPU accounting controllers
        # (respectively "cpu" and "cpuacct") with "-o cpuacct,cpu"
        # but on a directory called "cpu,cpuacct" (note the inversion
        # in the order of the groups). This tries to work around it.
        [ $SUBSYS = cpuacct,cpu ] && ln -s $SUBSYS $CGROUP/cpu,cpuacct
done

# Note: as I write those lines, the LXC userland tools cannot setup
# a "sub-container" properly if the "devices" cgroup is not in its
# own hierarchy. Let's detect this and issue a warning.
grep -q :devices: /proc/1/cgroup ||
	echo "WARNING: the 'devices' cgroup should be in its own hierarchy."
grep -qw devices /proc/1/cgroup ||
	echo "WARNING: it looks like the 'devices' cgroup is not mounted."

# Now, close extraneous file descriptors.
pushd /proc/self/fd >/dev/null
for FD in *
do
	case "$FD" in
	# Keep stdin/stdout/stderr
	[012])
		;;
	# Nuke everything else
	*)
		eval exec "$FD>&-"
		;;
	esac
done
popd >/dev/null


# If a pidfile is still around (for example after a container restart),
# delete it so that docker can start.
rm -rf /var/run/docker.pid

# If we were given a PORT environment variable, start as a simple daemon;
# otherwise, spawn a shell as well
if [ "$PORT" ]
then
	exec docker daemon -H 0.0.0.0:$PORT -H unix:///var/run/docker.sock \
		$DOCKER_DAEMON_ARGS
else
	if [ "$LOG" == "file" ]
	then
		docker daemon $DOCKER_DAEMON_ARGS &>/var/log/docker.log &
	else
		docker daemon $DOCKER_DAEMON_ARGS &
	fi
	(( timeout = 60 + SECONDS ))
	until docker info >/dev/null 2>&1
	do
		if (( SECONDS >= timeout )); then
			echo 'Timed out trying to connect to internal docker host.' >&2
			break
		fi
		sleep 1
	done
	[[ $1 ]] && exec "$@"
	exec bash --login
fi