Hello,
I'm trying to set up a Jenkins master to use another server as a Jenkins
agent host, running Docker containers on the host for different
environments.
My master is running jenkinsci/blueocean. The agent host server is running
Docker with tcp://0.0.0.0:2376 open.
TL;DR Question: Why isn't my ubuntu:16.04-based Docker image launching
correctly, and how should I set up this environment?
I can run my test pipeline on the host with the default jenkinsci/slave
image, which is based on the openjdk-8:jre image.
I've created my own image which is based on ubuntu:16.04, in order to
create a Ubuntu build environment. I've copied in most of the
jenkinsci/slave sections, to do things like get slave.jar in the right
place, set up users/groups, etc. My Dockerfile is located at the bottom of
this post.
The issue is that, when the Master tries to provision an agent to build, I
get the following error:
INFO: Trying to run container for node ubuntu-1604-0001undhvwt76 from
image: test:0.1
Oct 19, 2018 6:10:16 PM com.nirima.jenkins.plugins.docker.DockerTemplate
doProvisionNode
INFO: Started container ID
dab1ac24bbad9ca00855f97306ebbcf938e7c6ce028a9c35a137989cf784d3f6 for node
ubuntu-1604-0001undhvwt76 from image: test:0.1
Exception in thread "main"
java.io.FileNotFoundException: /agent.log (Permission denied)
at java.io.FileOutputStream.open0(Native Method)
at java.io.FileOutputStream.open(FileOutputStream.java:270)
at java.io.FileOutputStream.<init>(FileOutputStream.java:213)
at java.io.FileOutputStream.<init>(FileOutputStream.java:162)
at
org.jenkinsci.remoting.engine.WorkDirManager.legacyCreateTeeStream(WorkDirManager.java:319)
at
org.jenkinsci.remoting.engine.WorkDirManager.setupLogging(WorkDirManager.java:288)
at hudson.remoting.Launcher.run(Launcher.java:304)
at hudson.remoting.Launcher.main(Launcher.java:283)
When jenkinsci/slave runs, it gets the following output:
INFO: Trying to run container for node test-0001uqx3pd659 from image:
jenkinsci/slave
Oct 19, 2018 6:14:54 PM com.nirima.jenkins.plugins.docker.DockerTemplate
doProvisionNode
INFO: Started container ID
4b9d599a4a516ab0f4583bce79e6c6c681b370882ea5307fd5b8a867b773cec3 for node
test-0001uqx3pd659 from image: jenkinsci/slave
Oct 19, 2018 6:14:56 PM hudson.slaves.NodeProvisioner$2 run
INFO: Image of jenkinsci/slave provisioning successfully completed. We have
now 6 computer(s)
channel started
Clearly my Dockerfile is missing something, but I have no idea what. I can
run it with the "docker run -i --rm --name agent --init test:0.1 java -jar
/usr/share/jenkins/slave.jar" and get the correct REMOTE line.
Dockerfile:
# Start with Docker Hub Ubuntu image
FROM ubuntu:16.04
## Install ubuntu-server
USER root
# These configurations are copied so that dpkg-reconfigure doesn't hang
COPY --chown=root:root etc_default_keyboard /etc/default/keyboard
COPY --chown=root:root etc_default_console-setup /etc/default/console-setup
#
RUN apt-get update
RUN DEBIAN_FRONTEND=noninteractive apt-get install -y ubuntu-server
## Install wget
RUN DEBIAN_FRONTEND=noninteractive apt-get install -y wget
## Install Java 8 and sshd
USER root
RUN DEBIAN_FRONTEND=noninteractive apt-get install -y
openjdk-8-jre-headless ssh
## Setup Jenkins environment
ARG user=jenkins
ARG group=jenkins
ARG uid=10000
ARG gid=10000
ENV HOME /home/${user}
RUN groupadd -g ${gid} ${group}
RUN useradd -c "Jenkins user" -d $HOME -u ${uid} -g ${gid} -m ${user}
ARG VERSION=3.26
ARG AGENT_WORKDIR=/home/${user}/agent
RUN curl --create-dirs -sSLo /usr/share/jenkins/slave.jar
https://repo.jenkins-ci.org/public/org/jenkins-ci/main/remoting/${VERSION}/remoting-${VERSION}.jar
\
&& chmod 755 /usr/share/jenkins \
&& chmod 644 /usr/share/jenkins/slave.jar
USER ${user}
ENV AGENT_WORKDIR=${AGENT_WORKDIR}
RUN mkdir /home/${user}/.jenkins && mkdir -p ${AGENT_WORKDIR}
VOLUME /home/${user}/.jenkins
VOLUME ${AGENT_WORKDIR}
WORKDIR /home/${user}
## Start the Jenkins slave process
#CMD java -jar /usr/share/jenkins/slave.jar -workDir ${AGENT_WORKDIR}
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