Explanation on usage:
If ‘Type: ‘ is in front of it, that is a command that should be put on the commandline.

OSDev Jenkins setup:

192.168.1.220 (curie)
Fedora 35 server
Go to the directory where the Dockerfile is located (usually /root/docker_jenkins) as root or import from git.
git clone git@gitlab.osdev.nl:jenkins/docker_jenkins.git

Dockerfile:
FROM jenkins/jenkins:lts-jdk11
USER root
RUN apt update && \
    apt install -y --no-install-recommends openssh-client build-essential gnupg curl cmake libboost* libpaho* ca-certificates apt-transport-https && \
    curl -sSfL https://apt.octopus.com/public.key | apt-key add - && \
    sh -c "echo deb https://apt.octopus.com/ stable main > /etc/apt/sources.list.d/octopus.com.list" && \
    apt update && apt install -y octopuscli
RUN echo "jenkins ALL=NOPASSWD: ALL" >> /etc/sudoers
USER jenkins


Setting up the docker image:
Type: docker build .

copy the hexstring behind “Succesfully built [hexstring]” and past the hexstring behind the following command:

Type: docker run -d --name=osdev_jenkins -p 8080:8080 -p 50000:50000 --restart=on-failure [hexstring]

type: docker ps -a
to check if the docker container is made, up and running.

Log into the docker container:
Type: docker exec -it osdev_jenkins bash

Type: cd
Type: ssh-keygen (to create the private and public key pair for ssh connectivity)
(choice to put in passphrase, up to you, but need to be remembered for the ssh connectivity of jenkins to other applications)

copy the content of id_rsa.pub to gitlab user jenkins as public key.
Now to establish a connection and verify the host key, do the following:
Type: cd
Type: git clone git@gitlab.osdev.nl:open_source/mqtt-cpp.git
Type: yes
Type: rm -rf mqtt-cpp

Backend is now setup.
Last thing to do is the following:
Type: cat /var/jenkins_home/secrets/initialAdminPassword
select and copy the result.

######################################################################################
Setting up jenkins frontend:

go to 192.168.1.220:8080 OR office.osdev.nl:18080
and follow the next steps to setup jenkins.

First paste the initialAdminPassword result into the textbox and accept.

Create an admin user:
name: jenkins
password: *jenkins password* (remember this one!)
email: jenkins@osdev.nl

Then go for the "Select which plugins to install" option and search for gitlab.
Select it and begin installation.

Extra plugins to install:
- generic-webhook-trigger (only available AFTER the initial setup, so install first, find the plugin through “manage plugins” later and install)


SSH credentials in Jenkins:
create a user “jenkins” and go to “users” "jenkins" “credentials”
Option: SSH connection with private key
Description: gitlab_ssh

copy the private key from the container.

How to copy the private file content to jenkins frontend:
docker exec -it osdev_jenkins bash
cd .ssh
cat id_rsa
copy ALL content of the file

In the gitlab_ssh configuration, find the private key header, select "enter directly" and paste the contents of the private keyfile


Add a job:
Description: mqtt-cpp_build
GitLab Connection:
select your gitlab_ssh connection.

Building steps:
execute shell script

add the cursive text (without asterixes) to the script frame:

step 1:

*cd /var/jenkins_home/workspace/mqtt-cpp_build
rm -rf mqtt-cpp*


Now add another buildstep with a shell script:

step 2:

*git clone git@gitlab.osdev.nl:open_source/mqtt-cpp.git
cd mqtt-cpp
scripts/setup_submodules -i
mkdir build
cd build
cmake ../
make*