aliana17/GitOps-pipeline-code

GitOps-pipeline-code

GitOps-pipeline-code

According to me moving an open source code from git into the production environment by means of automation is called GitOps.

When we say GitOps pipeline we mean linking all the steps from building the code to deploying it into production. Here are some easy steps to follow to create a GitOps pipeline.

PS: I am creating this setup on AWS.

1. Install JENKINS on your machine.

• sudo wget -O /etc/yum.repos.d/jenkins.repo https://pkg.jenkins.io/redhat-stable/jenkins.repo
• sudo rpm --import https://pkg.jenkins.io/redhat-stable/jenkins.io.key
• sudo yum install jenkins java-1.8.0-openjdk-devel -y
• sudo systemctl daemon-reload
• sudo systemctl start jenkins

2. Open Jenkins Dashboard http://:8080

Note: If you are doing this setup on AWS, make sure to configure Security groups that allows port 8080

3. Install additional plugins - Docker, Git, Docker pipeline

4. Give jenkins user permission for using docker socket of the underlying machine. This step is performed as Jenkins needs a machine to launch its docker container. sudo visudo -f /etc/sudoers Add following line at the end of the visudo file. jenkins ALL= NOPASSWD: ALL This will also allow the Jenkins User to run su (super user) commands without the need to input a password. Once this is done, switch to the Jenkins user on the terminal. sudo su - jenkins

5. Create new Item as pipeline

6. Enter the project URL Under Pipeline section select Pipeline script from SCM and enter repository url(By configuring this setting we are telling jenkins to look into this repository for Jenkinsfile required to build pipeline.)

7. Don't change Script path.

8. Click Save.

#Creating Dynamic Slaves Dynamic Slaves are the ones the get created only to build the job and get destroyed after completing the work assigned to them. This way, it reduces the wastage of resources that wait for job to run on them. We can better utilize these resources for some other task.

1. Build an image given in Repository for slave. This image only have java and ssh installed which is required to become slave agent for jenkins. One can add other softwares as per her requirement.
2. Go to Manage Jenkins -> Manage Nodes and Cloud -> Configure Clouds
3. Configure Docker Host API that jenkins will use to create containers using docker. edit /lib/systemd/system/docker.service

Replace this line with this one.

 ExecStart=/usr/bin/dockerd -H tcp://0.0.0.0:4243 -H unix:///var/run/docker.sock

Reload the docker daemon systemctl daemon-reload Restart the container sudo service docker restart

4. Add new Cloud Name - docker Docker Host URI - tcp://:4243 Enabled - Checkbox tick Expose DOCKER_HOST - tick

5. Agent Templates - Docker Image- docker-slave:latest Remote File System Root - /root/jenkins_node Connect method - Connect with SSH SSH Key - Use configured SSH cred Host Key Verification Strategy - Non verify Pull strategy - Pull all images (Hosted on dockerhub) Nevel pull(if image is locally present)

6. While configuring Job set the option of where this job can be run.