pcfunda.com: AWS

Resize boot volume of a Linux EC2 instance.

For this example, suppose that you have resized the boot volume of an instance, such as a T2 micro instance, from 10 GB to 20 GB. Step1- Login to aws console and go to EC2 services.

Step 2- In the EC2 console select volumes.

Automating Integration & Deployment Using Git, Jenkins and Docker Part 5 /Integrating Git HUb with jenkins

GITHUB

GitHub Integration with Jenkins.

Precondition

Jenkins GitHub plugin.

1.Make Sure to Install Git Hub Integration Plugin.

2.If not you can install it from Jenkins Plug Manager.

GitHub Personal Access Token.

Let’s go down the rabbit hole. You first need to create GitHub personal access token for user that has access to GitHub repository. In my case, that was my GitHub account.

Click on your GitHub avatar
Select Settings

Select Developer Settings

Select Personal Access Token

Enter your GitHub password

Hmmm, possible GitHub UX issue, this is 4th level depth to get to this feature. Step 5 shows that GitHub knows web security.

Click generate new token

Enter meaningful name
Select permissions: admin:repo_hook, repo
Generate token

Copy token. Be careful, this is your only chance to copy it.

Again, proof that GitHub understands web security.

Jenkins Global credentials

Using GitHub token, you will create Jenkins global credential.

In Jenkins, click credentials
Click global (any of provided links)

My note on Jenkins UX. Its free, and I understand that team do not have much resources. But credentials UX is really messed up.

On left, click Add credentials
For kind select secret text
For scope leave Global option
In secret, paste GitHub token.
Enter meaningful description. Trust me, this is very important, otherwise you will not be able to select this credential.

Jenkins Github settings

Manage Jenkins
Configure System
Scroll down to Github settings
Add github server

Set meaningful name
Leave default API url
Select credentials created in previous step.
Click apply
Click test connection. Following message should appear: Credentials verified for user xxx, rate limit: 4998

Note rate limit. You have 5000 requests per hour for all github integrations, not just Jenkins.

Go to My repository https://github.com/erakm5493/microservices and then fork it .

Note -From now own wards you must use your own repository which you have forked.

I will demonstrate further step using my own repository. (You have to use it your own)

GitHub repository webhook

Go to GitHub repository that you are integrating with Jenkins. You need to have admin rights for that repo.
Click Settings
Select webhooks
Add webhook
Payload url is jenkins_url_with_http_or_https/github-webhook/
Content type: application/json
Just push event if you only want to trigger jenkins jobs by branch pushes.
Check Active
Click update
Recent deliveries should have green check icon.

If that is not the case, click on latest delivery that will contain HTTP request/response.

Jenkins job build trigger.

Go to your jenkins job
In Build Triggers section, check out: GitHub hook trigger for GITScm polling

Check

Commit something to your repo in branch for which job is configured.
Job should start executing.

Automating Integration & Deployment Using Git, Jenkins and Docker Part 3 / Docker Installation

Docker

Docker Installation.

There are several Docker specific jargon that we need to clarify before diving into installation and usage examples. Below are commonly used terminologies in Docker ecosystem.

Docker daemon: This is also called Docker Engine, it is a background process which runs on the host system responsible for building and running of containers.
Docker Client: This is a command line tool used by the user to interact with the Docker daemon.
Docker Image: An image is an immutable file that’s essentially a snapshot of a container. A docker image has a file system and application dependencies required for running applications.
Docker container: This is a running instance of a docker image with an application and its dependencies. Each container has a unique process ID and isolated from other containers. The only thing containers share is the Kernel.
Docker registry: This is an application responsible for managing storage and delivery of Docker container images. It can be private or public.

We will install Docker CE on RHEL 8 / CentOS 8. We will start with the installation of Docker then Docker Compose.

There are two editions of Docker available.

Community Edition (CE): ideal for individual developers and small teams looking to get started with Docker and experimenting with container-based apps.
Enterprise Edition (EE): Designed for enterprise development and IT teams who build, ship, and run business-critical applications in production at scale.

The Docker Enterprise Edition requires an active license to use. In this guide, we will install Docker CE on RHEL 8. Let’s add Docker repository before we can install it.

# sudo curl https://download.docker.com/linux/centos/docker-ce.repo -o /etc/yum.repos.d/docker-ce.repo

This command will download Docker repository file to /etc/yum.repos.d/docker-ce.repo. Let’s update RPM index cache.

# sudo yum makecache