Hi there,
I have a machine A that runs Jenkins and Bitbucket-server in docker containers.
I have a machine B, that just has docker listening over tcp.
I have a project that uses Declarative pipeline with "agent { docker
'foobar:X.Y'}"
I'm using "jenkinsci/blueocean:latest" docker image with
"docker-workflow v1.15" plugin.
Ignoring machine B (for now), my setup is working:
- 1. A dev open a pull-request on bitbucket
- 2. The declarative pipline is executed by jenkins
- 3. The docker container(s) specified in the Jenkinsfile are executed
by machine A
- 4. The pipeline finished
- 5. Jenkins notify Bitbucket.
>From a docker point of view, for the above to work, I simply need to
run the Jenkins container with --volume
/var/run/docker.sock:/var/run/docker.sock
Now, I would like to achieve 3 things:
- Leave machine A runs non-build services only
- Use machine B to spawn containers as directed by declarative pipelines.
- Eventually make machine B a docker swarm manager, and let other
docker swarm workers join in if/when needed.
The first modification I did to the jenkins container is to remove the
"/var/run/docker.sock" volume. This is to make sure jenkins can only
talk to the remote docker I configure.
I have then tried 3 plugins:
- "docker plugin" https://plugins.jenkins.io/docker-plugin
- "docker swarm" https://plugins.jenkins.io/docker-swarm
- "Yet another docker plugin"
https://plugins.jenkins.io/yet-another-docker-plugin
All of them add a type of "cloud providers", but I never managed to
get my pipeline executed using one.
The "docker plugin" is the only one that gave me the feeling I was almost there:
The job was handled by a docker container spawn on machine B, which i
had to specify the image name (From examples and tutorials, i settled
down on "jenkinsci/jnlp-slave" in "Launch attached" mode).
But at that stage, I got an error "docker: command not found" emitted
from the jnlp-slave container.
The reason being that Jenkins master contacted docker on machine B to
execute a "jenkinsci/jnlp-slave", and then ask this
"jenkinsci/jnlp-slave" to execute the pipeline, which is an operation
that requires to instantiate the docker containers specified in the
project's pipeline...
So I would like to know if the "docker-plugin" is the right tool for
my job or should I head in another direction.
In case "docker-plugin" is the way to go, then how do I tell my
customised jnlp-slave to connect to the right docker daemon? Is there
an off-the-shelf docker image to play that role? I couldn't find
documentation on how to create it, and the specificites of having
docker inside it.
As a side note:
I found a bit inefficient to have to instantiate Jenkins slave
container whose sole purpose is to read the pipeline and spawn
containers as directed by the pipeline.
Ideally I would like the pipeline to be parsed by Machine A (jenkins
master) and the required containers to be executed on machine B, I do
not know if volumes (jenkins workspace) can be shared across 2 docker
daemons thought...
Any opinion or advice are very welcome, point-out of any sort would be
greatly appreciated too.
Thanks,
Chris
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