I am building a gradle project in Jenkins. and client has asked to build the project in docker image. i am new to Jenkins and docker(i am able to build the project normally on Jenkins) i have installed the docker plugin and now it asks for DOCKER URL and Docker API under cloud settings. what are those and how to configure the docker. i am running Jenkins on the remote server, which is setup by another person. i don't have access to shell command, i have to use docker and build the project, and what is dockerfile and how to build and what to put in it.
As per the jenkins docker plugin page
The URL to use to access your Docker server API (e.g: http://172.16.42.43:4243)
But I will recommend you to use https://your_local_docker_machine_ip_here:2376
Related
I'm running Jenkins version 2.176.3 on Openshift online. And I want to build a pipeline which uses Docker commands to build the image. When I tried to build it gives me an error saying Docker command not found.
I think that is because I don't have Docker installed in Jenkins. I tried to do that using the Jenkins Plugin Manager but the Docker plugin requires Jenkins version 2.19 or later.
I also tried accessing the Jenkins container using oc CLI and tried to install Docker but did not work.
So what would be the best method for me to install Docker inside Jenkins?
The error means you need to have/install docker inside your agent/slave image. For a test purpose try to run your pipeline with docker images, which already contain docker tool.
After researching about different CI i decided to use Gitlab to build and deploy my application which is a set Spring boot applications using Spring cloud.
I have installed Gitlab on prem. on our build server and installed gitlab-runner on test-server which is running the application inside docker.
unfortunately the test server doesnt have access to internett and i cant build application by maven. I am a bit confused on how i can use gitlab to build and deploy my project.
Right now i do the building manually in following steps
On my pc
Build the project by mvn clean install
Build docker images by docker-compose build
Push the docker images to docker-hub with docker-compose push
on the test server
pull images from docker-hub docker-compose pull
run application in docker docker-compose up
What is the best approach to use gitlab on my project?
I am trying to start a container using Jenkins and a Dockerfile in my SCM.
Jenkins uses the Dockerfile from my SCM repository and builds the image on a remote server having a Dockerfile. This is done using the "cloud bees docker build and publish plugin".
When I ssh to the server, I see that the image has been built with the tags I had defined in Jenkins.
# docker image ls
What I am not able to do is run a container for the image that has been built. How to get the image-id and start the container? Shouldn't it have been very simple given many plugins are provided?
Could your problem be related to how to refer to the recently created docker in order tu run it? Can you provide an extract of your pipeline and how you are trying to achieve this?
It that was the case, there are different solutions, one being specifying a tag during the Docker creation, so you can then refer to it to run it.
In reply to how to work with image-ids, the docker build process will return the image id of the docker it creates. You can capture that id, and then use to run the docker.
start the container yourself on the VM by using standard docker run command.
use a software like watchtower to restart the container with an updated version when available
Hi I'm learning how to use Jenkins integrated with Docker and I don't understand what should I do to communicate them.
I'm running Jenkins inside a Docker container and I want to build an image in a pipeline. So I need to execute some docker commands inside the Jenkins container.
So the thing here is where docker come from. I understand that we need to bind mount the docker host daemon (socket) to the Jenkins container but this container still needs the binaries to execute Docker.
I have seen some approaches to achieve this and I'm confused what should I do. I have seen:
bind mount the docker binary (/usr/local/bin/docker:/usr/bin/docker)
installing docker in the image
if I'm not wrong the blue ocean image comes with Docker pre-installed (I have not found any documentation of this)
Also I don't understand what Docker plugins for Jenkins can do for me.
Thanks!
Docker has a client server architecture. The server is the docker deamon and the client is basically the command line interface that allows you to execute docker ... from the command line.
Thus when running Jenkins inside Docker you will need access to connect to the deamon. This is acheieved by binding the /var/run/docker.sock into the container.
At this point you need something to communicate with the Deamon which is the server. You can either do that by providing access to docker binaries. This can be achived by either mounting the docker binaries, or installing the
client binaries inside the Jenkins container.
Alternatively, you can communicate with the deamon using the Docker Rest API without having the docker client binaries inside the Jenkins container. You can for instance build an image using the API.
Also I don't understand what Docker plugins for Jenkins can do for me
The Docker plugin for Jenkins isn't useful for the use case that you described. This plugin allows you to provision Jenkins slaves using Docker. You can for instance run a compilation inside a Docker container that gets automatically provisioned by Jenkins
It is not best practice to use Docker with Jenkins. It is also not a bad practice. The relationship between Jenkins and Docker is not determined in such a manner that having Docker is good or bad.
Jenkins is a Continuous Integration Server, which is a fancy way of saying "a service that builds stuff at various times, according to predefined rules"
If your end result is a docker image to be distributed, you have Jenkins call your docker build command, collect the output, and report on the success / failure of the docker build command.
If your end result is not a docker image, you have Jenkins call your non-docker build command, collect the output, and report on the success / failure of the non-docker build.
How you have the build launched depends on how you would build the product. Makefiles are launched with make, Apache Ant with ant, Apache Maven with mvn package, docker with docker build and so on. From Jenkin's perspective, it doesn't matter, provided you provide a complete set of rules to launch the build, collect the output, and report the success or failure.
Now, for the 'Docker plugin for Jenkins'. As #yamenk stated, Jenkins uses build slaves to perform the build. That plugin will launch the build slave within a Docker container. The thing built within that container may or may not be a docker image.
Finally, running Jenkins inside a docker container just means you need to bind your Docker-ized Jenkins to the external world, as #yamenk indicates, or you'll have trouble launching builds.
Bind mounting the docker binary into the jenkins image only works if the jenkins images is "close enough" - it has to contain the required shared libraries!
So when sing a standard jenkins/jenkins:2.150.1 within an ubuntu 18.04 this is not working unfortunately. (it looked so nice and slim ;)
So the the requirement is to build or find a docker image which contains a compatible docker client for the host docker service is.
Many people seem to install docker in their jenkins image....
I have installed jenkins 2.99 on my ICP V2.1. I have configured a pipeline job to build docker images and push to the local repository in a jenkinsfile, But the docker command is not getting recognised. I am getting the error
docker build -t <tag> .
/<>/script.sh: docker: not found
If docker has to be installed separately, how do we install?
Considering ICP (IBM Cloud Private) is an application platform for developing and managing on-premises, containerized applications, docker should be installed already.
Check, outside of Jenkins, that docker is recognized.
which docker
Then, in the Jenkins page displaying the Job result, check the Environment variable section, and see if the PATH would include the folder where docker is installed.