In this reference architecture, you will build and deploy python application by using OCI DevOps and OCI Function services.
The application source code is hosted on a DevOps code repository. The end user commits the code into the code repository. A new commit to the code repository will trigger the start of a build pipeline. The build pipeline follows a user-defined flow to build the function artifacts to deploy to OCI Function services. The output of the build is stored in the container registry as Docker images. The deployment pipeline then uses the built image from the container registry to deploy to the OCI Functions environment. The following architecture diagram shows how an application is built and deployed by using a default image and a custom image (by using a Dockerfile).
To simplify the setup of this example CI/CD workflow, this sample application uses Terraform to automate creation and configuration of DevOps resources.
The following diagram illustrates this reference architecture.
Description of the illustration cicd-pipe-devops-functions-arch.png
This architecture has the following components:
An OCI region is a localized geographic area that contains one or more data centers, called availability domains. Regions are independent of other regions, and vast distances can separate them (across countries or even continents). The architecture uses a single region.(Video) Automated Software Deployments using OCI DevOps Service
- DevOps project
A logical grouping of DevOps resources needed to implement a CI/CD workflow. DevOps resources can be artifacts, build pipelines, deployment pipelines, external connections, triggers, and environments. DevOps projects make it easy to enable logging, monitoring, and notifications for all your DevOps resources.
- Build pipeline
A build pipeline takes a commit ID from your source code repositories and uses that source code to run your build instructions. Build pipelines define a set of stages for the build process: building, testing and compiling software artifacts, delivering artifacts to OCI repositories, and optionally triggering a deployment. You define the flow and instructions of your build run in the build spec file.
- Code repository
Private Git repositories hosted by the DevOps service. You can store, manage, develop source code with our DevOps Code Repositories.(Video) Oracle DevOps Cloud Service - Deployment Pipelines
- Deployment pipeline
A sequence of steps for delivering and deploying a set of artifacts to a target environment. The flow and logic of your software release can be controlled by defining stages that can run in serial or parallel.
- Deployment stages
Stages are individual actions that take place during a run of a pipeline. The DevOps deployment pipeline includes the following predefined stage types for you to use in your release process:
- Rolling deployment: An incremental release to Oracle Container Engine for Kubernetes (OKE), Functions, or instance groups
- Wait: Wait N seconds
- Manual approval: Proceed if an approval is given; stop if an approval is rejected.
- Invoke function: Perform custom tasks or integrations by calling a Function and pass an artifact of request parameters.
- DevOps artifact
A DevOps artifact is a reference or pointer to any file, binary, package, manifest, or image that makes up your application. When creating an artifact, inform Oracle DevOps of the source location of the actual artifact. DevOps supports OCI Container Image Registry and OCI Artifact Registry repositories.(Video) Create A Continuous Integration Pipeline With Jenkins And GitHub on Oracle Cloud Infrastructure
- Artifact repository
Artifact repository creates repositories to group similar artifacts. When the repository is created, you can upload artifacts to it. These artifacts are a collection of text files, binaries, and deployment manifests that are delivered to the target deployment environment. Each artifact has a name, which is made of its path: version. The path is a string to organize the artifacts.
- OCI Logging and Notification services
OCI Logging service stores logs related to the deployment. The deployment runtime output and the final results of the deployment are shown as log entries. OCI Notifications service provides visibility into the latest state of the deployment project and its resources and takes any necessary action. For example, you're notified when an important event, such as a stage in a deploy pipeline waiting for approval. When you receive the notification message, you can go to DevOps deployment pipelines and approve the stage.
- Deployment environments
An environment is a collection of a customer’s computing resources where artifacts are deployed. Environments can be a function, Compute virtual machine (VM) or bare metal instance, or an OKE cluster.(Video) Oracle Cloud Infrastructure DevOps: Overview
- Oracle Kubernetes cluster: OCI Container Engine for Kubernetes (OKE) is a fully managed, scalable, and highly available service that you can use to deploy your containerized applications to the cloud.
- Compute instances: The OCI Compute service enables you provision and manage Compute hosts in the cloud. You can deploy Compute instances with shapes that meet your resource requirements for CPU, memory, network bandwidth, and storage.
- Functions: Oracle Functions is a fully managed, multitenant, highly scalable, on-demand, functions-as-a-service platform. The service is built on enterprise-grade Oracle Cloud Infrastructure and powered by the Fn Project open source engine.