Configuring GitLab Container Registry, CI Pipeline with SonarQube

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In today’s tutorial, we are going to use the GitLab container registry to store images. Please refer to our GitLab guide for GitLab installation and configurations.

Let’s get started with installing container first.

1. Configure Container Registry

Navigate to the admin area, and the first thing you notice is the Container registry is turned off by default setting.

Install Container registry

We should modify the GitLab configuration file. Enter the following command:

a) Modify gitlab.rb

vim /etc/gitlab/gitlab.rb

Change the following line:

registry_external_url 'https://gitlab.fosslinux.com:5050'

Now the registry URL is listening on HTTPS under the existing GitLab URL with a different port.

b) After modification, you need to reconfigure Gitlab.

gitlab-ctl reconfigure

Once done, go to the admin area, and this time, you should see it enabled.

c) Test the container login from a different machine. However, note that the Docker should be installed on that system.

docker login gitlab.fosslinux.com:5050

The default images store location is as follows:

/var/opt/gitlab/gitlab-rails/shared/registry

If you want to change the path, use VIM to edit it.

vim /etc/gitlab/gitlab.rb

Change the following line:

gitlab_rails['registry_path'] = "/path/to/registry/storage"

Then reconfigure.

gitlab-ctl reconfigure

2. Creating a Project

We shall create a new project for a pipeline. To do that, go to the Admin Area.

You should see Admin Area similar to this:

Then click on the New Group.

You can give any name to your group. Then type a name for the project URL. Visibility level is “Private” here; we created a group called “gitdemo.”

Then again Go to Admin Area -> New Project

Give a name for the project. Select the previously created group for the project.

After creating a Project, you can add a sample file to the repository.

3. Enable container registry for project

Go to Project settings -> General and then expand Visibility, Projet Features, Permissions.

Then enable the Container registry.

 

Now go your project, and you can see the container registry under the packages section.

4. Disable AutoDevops

Go to your project -> Settings -> CICD

Then expand Auto DevOps and unselect “Default to Auto DevOps pipeline.”

 

5. Create an SSH Key from the client/developer machine

Here we are going to create ssh key and authenticate with our GitLab. After that, we can push, pull, clone git repositories from our client machine.

a) Run the following the command to generate key:

ssh-keygen -t rsa -b 4096 -C "darshana@fosslinux.com"

b) Copy public key:

cat ~/.ssh/is_rsa_pub

Now login to the GitLab server. Go to Profile -> SSH Keys

c) Add Copied key to key section and save.

d) Now we need to get Url for Clone repo using SSH.

Go to your project -> Clone.

Copy clone with ssh URL.

Before we are going to clone the repository to our machine, we need to install “git ”

Install git on client-server:

yum install git -y

Now we are going to Clone the repository and push our code to the Gitlab repository.

Git global setup

git config --global user.name "Darshana"

git config --global user.email "darshana@fosslinux.com"

Run the following command to clone the repository:

git clone git@git.fosslinuxcom:gitdemo/fosslinux.git

Copy your source code to the cloned folder.

Go to the cloned folder:

cd fosslinux

Now push code to the repository:

git add .

git status

git commit -m "demo Project files"

git push

6. Install GitLab Runner

It is recommended to install GitLab Runner on a server separate from where GitLab is installed. You can install it on the same server, too, if you still want it that way.

Here we are going to use Docker executor; therefore, we should install Docker before using the Runner.

a) The Docker executor

GitLab Runner can use Docker to run jobs on user-provided images due to the use of Docker executor.

The Docker executor, when used with GitLab CI, connects to Docker Engine and runs each build in a isolated container using the predefined image that is configured in the Gitlab CI file. We will see the Gitlab CI file when we discuss the Pipeline.

Install repository:

curl -L https://packages.gitlab.com/install/repositories/runner/gitlab-runner/script.deb.sh | bash

Install Runner:

apt-get install gitlab-runner

Check Runner status:

gitlab-runner status

Register Runner

Here we are going to add a shared Runner. Go to Admin Area -> Runners.

Then you can see Set up a shared Runner manually section. We need our Gitlab Url and token for the registered Runner.

Run Register Runner

Run the following command to register the Runner.

gitlab-runner register

It should ask a few questions. Answer the following questions.

a) Enter your GitLab instance URL:

Please enter the gitlab-ci coordinator URL (e.g. https://gitlab.com )
https://gitlab.fosslinux.com

b) Enter the token you obtained to register the Runner:

Please enter the gitlab-ci token for this runner
xxxxxxxxxxxxxxxxxxxxxxx

c) Enter a description for the Runner; you can change this later in GitLab’s UI:

Please enter the gitlab-ci description for this runner
[hostname] Docker-runner

d) Enter the tags associated with the Runner; you can change this later in GitLab’s UI:

Please enter the gitlab-ci tags for this runner (comma separated):
master,dev,qa

e) Enter the Runner executor:

Please enter the executor: ssh, docker+machine, docker-ssh+machine, kubernetes, docker, parallels, virtualbox, docker-ssh, shell:
docker

f) If you chose Docker as your executor, you’d be asked for the default image to be used for projects that do not define one in .gitlab-ci.yml:

Please enter the Docker image (eg. ruby:2.6):
alpine:latest

Now Runner registered successfully.

Restart Runner

gitlab-runner restart

Now refresh the Runners page (Admin Area -> Runners). You can see the newly added Runner.

We need to modify some settings for the Runner. So click on the token.

Then select “Run untagged jobs” and save changes.

Change Gitlab runner configurations

We are going to use docker-in-docker (dind) mode in the GitLab pipeline, So we have to use privileged = true in our Docker containers. Therefore we are going to enable privileged mode.

Edit configuration file:

vim /etc/gitlab-runner/config.toml

Change the “privileged” section.

privileged = true

After modification, you can see a file similar to this.

Then restart Runner.

gitlab-runner restart

7. Configure variables for GitLab PipeLine

Add container registry variables

Click on project -> Settings ->CICD -> Variables (click on Expand).

Add the following to the key and add value.

CI_REGISTRY_USER

CI_REGISTRY_PASSWORD

Here you need to add GitLab login and password.

Integrate with SonarQube Server

Get SonarQube token and add it to GitLab. Login to SonarQube Server.

Go to Administration > click on Security > Users > Click on Tokens

It should open a token Window.

Generate token with any name -> Copy the token.

Copy token and go to GitLab again. Click on project -> Settings ->CICD -> Variables

Add a new variable.

SONARQUBE_TOKEN

Paste sonar token to “SONARQUBE_TOKEN” value.

8. Create a Pipeline

Following files should be in the repository folder

a) Dockerfile

We need a docker file to build our image. Follow our docker file guide.

Here is our docker file:

FROM ddarshana/alpinenode10

ENV NODE_ENV=production
RUN apk add --update curl && rm -rf /var/cache/apk/*
RUN mkdir /app
WORKDIR /app

COPY package.json .

RUN npm install
COPY . .

CMD ["npm", "start"]

Go to your project and create a new file called “Docker File.”

b) Add sonar-project.properties

Sonar property file should be in our source code root directory to send scan data to SonarQube Server.

Here is our file:

# Required metadata
sonar.projectKey=fosslinux
sonar.projectName=fosslinux

# Comma-separated paths to directories with sources (required)
sonar.sources=./

# Language
sonar.language=js
sonar.profile=node
# Encoding of sources files
sonar.sourceEncoding=UTF-8

Go to your project and create “sonar-project.properties.”

I. Create a GitLab-CI file

Go to your project and create a file called “.gitlab-ci.yml.”

This is our file.

stages:
- Lint images
- Codequality
- Build and publish images

variables:
DOCKER_REGISTRY: gitlab.fosslinux.com:5050
APP_NAME: fosslinux

linting:
stage: Lint images
image: node:4-alpine
only: 
- master
script:
- npm install -g dockerlint && npm cache clean
- find ./ -name Dockerfile -exec dockerlint {} \;

codequality:
stage: Codequality
image: ddarshana/alpine-sonarscanner
script:
- sonar-scanner -Dsonar.host.url=https://sonar.fosslinux.com -Dsonar.login=$SONARQUBE_TOKEN -Dsonar.projectVersion=$CI_PIPELINE_ID -Dsonar.projectName=$CI_PROJECT_NAME+$CI_BUILD_REF_NAME
only: 
- master

publishing:
stage: Build and publish images 
image: docker:18.09.7
services:
- docker:18.09.7-dind
only: 
- master

script:

- docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $DOCKER_REGISTRY
- docker build . -t $DOCKER_REGISTRY/gitdemo/$APP_NAME:$CI_PIPELINE_ID
- docker push $DOCKER_REGISTRY/gitdemo/$APP_NAME:$CI_PIPELINE_ID
- echo "pushed image $APP_NAME:$CI_PIPELINE_ID"
- docker logout $DOCKER_REGISTRY

Here we have defined three stages for our Pipeline:

stages: 
- Lint images 
- Codequality 
- Build and publish images

Variables are set for the docker registry and Application name.

variables: 
DOCKER_REGISTRY: gitlab.fosslinux.com:5050 
APP_NAME: fosslinux

Once you commit changes to the master branch, the Pipeline should start.

As you see, the Pipeline is running. You can see the stages of the Pipeline.

If all stages are a success, you can see the output as follows.

You can click on any stages and see their logs.

a) Check the container registry.

Project -> Packages -> container registry

Then you can see our image.

b) Check Sonar report

Login to SonarQube, and you can see the report for our project.

That’s all about creating a GitLab pipeline with GitLab container service and Sonarqube integration.