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https://github.com/hakdogan/jenkins-pipeline
:chart_with_upwards_trend: Learn how to implement container technologies with your Jenkins CI/CD workflows to make them easier to manage in this tutorial.
https://github.com/hakdogan/jenkins-pipeline
continuous-delivery continuous-integration docker docker-compose jenkins jenkins-pipeline
Last synced: 29 days ago
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:chart_with_upwards_trend: Learn how to implement container technologies with your Jenkins CI/CD workflows to make them easier to manage in this tutorial.
- Host: GitHub
- URL: https://github.com/hakdogan/jenkins-pipeline
- Owner: hakdogan
- Created: 2017-11-23T11:34:17.000Z (almost 7 years ago)
- Default Branch: master
- Last Pushed: 2022-10-27T11:50:03.000Z (about 2 years ago)
- Last Synced: 2024-09-30T18:05:22.116Z (about 1 month ago)
- Topics: continuous-delivery, continuous-integration, docker, docker-compose, jenkins, jenkins-pipeline
- Language: Java
- Homepage:
- Size: 4.92 MB
- Stars: 102
- Watchers: 11
- Forks: 374
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
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# A tutorial about Continuous Integration and Continuous Delivery by Dockerize Jenkins Pipeline
This repository is a tutorial it tries to exemplify how to automatically manage the process of building, testing with the highest coverage, and deployment phases.
Our goal is to ensure our pipeline works well after each code being pushed. The processes we want to auto-manage:
* Code checkout
* Run tests
* Compile the code
* Run Sonarqube analysis on the code
* Create Docker image
* Push the image to Docker Hub
* Pull and run the image
## First step, running up the services
Since one of the goals is to obtain the ``sonarqube`` report of our project, we should be able to access sonarqube from the jenkins service. ``Docker compose`` is a best choice to run services working together. We configure our application services in a yaml file as below.
``docker-compose.yml``
```yml
version: '3.2'
services:
sonarqube:
build:
context: sonarqube/
ports:
- 9000:9000
- 9092:9092
container_name: sonarqube
jenkins:
build:
context: jenkins/
privileged: true
user: root
ports:
- 8080:8080
- 50000:50000
container_name: jenkins
volumes:
- /tmp/jenkins:/var/jenkins_home #Remember that, the tmp directory is designed to be wiped on system reboot.
- /var/run/docker.sock:/var/run/docker.sock
depends_on:
- sonarqube
```
Paths of docker files of the containers are specified at context attribute in the docker-compose file. Content of these files as follows.
``sonarqube/Dockerfile``
```
FROM sonarqube:6.7-alpine
```
``jenkins/Dockerfile``
```
FROM jenkins:2.60.3
```
If we run the following command in the same directory as the ``docker-compose.yml`` file, the Sonarqube and Jenkins containers will up and run.
```
docker-compose -f docker-compose.yml up --build
```
```
docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
87105432d655 pipeline_jenkins "/bin/tini -- /usr..." About a minute ago Up About a minute 0.0.0.0:8080->8080/tcp, 0.0.0.0:50000->50000/tcp jenkins
f5bed5ba3266 pipeline_sonarqube "./bin/run.sh" About a minute ago Up About a minute 0.0.0.0:9000->9000/tcp, 0.0.0.0:9092->9092/tcp sonarqube
```
## GitHub configuration
We’ll define a service on Github to call the ``Jenkins Github webhook`` because we want to trigger the pipeline. To do this go to _Settings -> Integrations & services._ The ``Jenkins Github plugin`` should be shown on the list of available services as below.
After this, we should add a new service by typing the URL of the dockerized Jenkins container along with the ``/github-webhook/`` path.
The next step is that create an ``SSH key`` for a Jenkins user and define it as ``Deploy keys`` on our GitHub repository.
If everything goes well, the following connection request should return with a success.
```
ssh [email protected]
PTY allocation request failed on channel 0
Hi /! You've successfully authenticated, but GitHub does not provide shell access.
Connection to github.com closed.
```
## Jenkins configuration
We have configured Jenkins in the docker compose file to run on port 8080 therefore if we visit http://localhost:8080 we will be greeted with a screen like this.
We need the admin password to proceed to installation. It’s stored in the ``/var/jenkins_home/secrets/initialAdminPassword`` directory and also It’s written as output on the console when Jenkins starts.
```
jenkins | *************************************************************
jenkins |
jenkins | Jenkins initial setup is required. An admin user has been created and a password generated.
jenkins | Please use the following password to proceed to installation:
jenkins |
jenkins | 45638c79cecd4f43962da2933980197e
jenkins |
jenkins | This may also be found at: /var/jenkins_home/secrets/initialAdminPassword
jenkins |
jenkins | *************************************************************
```
To access the password from the container.
```
docker exec -it jenkins sh
/ $ cat /var/jenkins_home/secrets/initialAdminPassword
```
After entering the password, we will download recommended plugins and define an ``admin user``.
After clicking **Save and Finish** and **Start using Jenkins** buttons, we should be seeing the Jenkins homepage. One of the seven goals listed above is that we must have the ability to build an image in the Jenkins being dockerized. Take a look at the volume definitions of the Jenkins service in the compose file.
```
- /var/run/docker.sock:/var/run/docker.sock
```
The purpose is to communicate between the ``Docker Daemon`` and the ``Docker Client``(_we will install it on Jenkins_) over the socket. Like the docker client, we also need ``Maven`` to compile the application. For the installation of these tools, we need to perform the ``Maven`` and ``Docker Client`` configurations under _Manage Jenkins -> Global Tool Configuration_ menu.
We have added the ``Maven and Docker installers`` and have checked the ``Install automatically`` checkbox. These tools are installed by Jenkins when our script([Jenkins file](https://github.com/hakdogan/jenkins-pipeline/blob/master/Jenkinsfile)) first runs. We give ``myMaven`` and ``myDocker`` names to the tools. We will access these tools with this names in the script file.
Since we will perform some operations such as ``checkout codebase`` and ``pushing an image to Docker Hub``, we need to define the ``Docker Hub Credentials``. Keep in mind that if we are using a **private repo**, we must define ``Github credentials``. These definitions are performed under _Jenkins Home Page -> Credentials -> Global credentials (unrestricted) -> Add Credentials_ menu.
We use the value we entered in the ``ID`` field to Docker Login in the script file. Now, we define pipeline under _Jenkins Home Page -> New Item_ menu.
In this step, we select ``GitHub hook trigger for GITScm pooling`` options for automatic run of the pipeline by ``Github hook`` call.
Also in the Pipeline section, we select the ``Pipeline script from SCM`` as Definition, define the GitHub repository and the branch name, and specify the script location (_[Jenkins file](https://github.com/hakdogan/jenkins-pipeline/blob/master/Jenkinsfile)_).
After that, when a push is done to the remote repository or when you manually trigger the pipeline by ``Build Now`` option, the steps described in Jenkins file will be executed.
## Review important points of the Jenkins file
```
stage('Initialize'){
def dockerHome = tool 'myDocker'
def mavenHome = tool 'myMaven'
env.PATH = "${dockerHome}/bin:${mavenHome}/bin:${env.PATH}"
}
```
The ``Maven`` and ``Docker client`` tools we have defined in Jenkins under _Global Tool Configuration_ menu are added to the ``PATH environment variable`` for using these tools with ``sh command``.
```
stage('Push to Docker Registry'){
withCredentials([usernamePassword(credentialsId: 'dockerHubAccount', usernameVariable: 'USERNAME', passwordVariable: 'PASSWORD')]) {
pushToImage(CONTAINER_NAME, CONTAINER_TAG, USERNAME, PASSWORD)
}
}
```
``withCredentials`` provided by ``Jenkins Credentials Binding Plugin`` and bind credentials to variables. We passed **dockerHubAccount** value with ``credentialsId`` parameter. Remember that, dockerHubAccount value is Docker Hub credentials ID we have defined it under _Jenkins Home Page -> Credentials -> Global credentials (unrestricted) -> Add Credentials_ menu. In this way, we access to the username and password information of the account for login.
## Sonarqube configuration
For ``Sonarqube`` we have made the following definitions in the ``pom.xml`` file of the project.
```xml
http://sonarqube:9000
...
...
org.codehaus.mojo
sonar-maven-plugin
2.7.1
maven-plugin
...
```
In the docker compose file, we gave the name of the Sonarqube service which is ``sonarqube``, this is why in the ``pom.xml`` file, the sonar URL was defined as http://sonarqube:9000.