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rockchico / python-oci-bluegreen-oke-app

python-oci-bluegreen-oke-app

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Sample illustration of OCI Devops deployment pipeline with BLUE-GREEN deployment strategies using Oracle Container Engine for Kubernetes (OKE).

License: UPL Quality gate

Objective

  • Create OCI Devops build pipeline.
  • Build a sample python application.
  • Push the artifact to OCI Container and OCI Artifact repo.
  • Use OCI Deployment pipeline with BLUE/GREEN Deployment strategies.
  • Validate deployment and manual role back.

Procedure

  • Create an artifact as type Kubernetes manifest.Enusure to add your artifact repo path and version as ${BUILDRUN_HASH} .

  • Accordingly select the code repo /connection type /repo name.

If you are using a code repo other than OCI code repo ,ensure to set an external connection - https://docs.oracle.com/en-us/iaas/Content/devops/using/create_connection.htm

  • Add an Deliver artifact stage to the build pipeline.

  • Select the two artifacts created.

  • Associate the build stage output artifact names .

outputArtifacts:
  - name: oke_app_base
    type: DOCKER_IMAGE
    # this location tag doesn't effect the tag used to deliver the container image
    # to the Container Registry
    location: oke_app_base:latest

  - name: oke_deploy_manifest
    type: BINARY
    # this location tag doesn't effect the tag used to deliver the container image
    # to the Container Registry
    location: ${OCI_PRIMARY_SOURCE_DIR}/oci-oke-deployment.yaml

  • Add a stage as Blue/Green Strategy.

  • Select the Deployment type as OKE and select the environment created.

  • Associate the the oke environment created.

  • Select Namespace A as ns-green and Namespace B as ns-blue.(These are names for test ,you may use other names accordingly)

  • Select the Kubernetes Artifacts.

  • Fill the ingress name as sample-oke-bg-app-ing .Its the sample ingress name declared via deployment manifest.

  • As its a demo keep the Validation controls as Noneor you may connect with a function to validate the deployment.

  • Enable the Approval controls and add 1 as the number of approvers.

  • Click add to add the stages.

  • Switch back to Build pipeline and add a Trigger Deployment stage.Select the deployment pipeline and associate.Ensure to check the Send build pipelines Parameters option.

  • In order to run the blue green we should install Nginx Ingress Controller to our OKE cluster.
  • Launch OCI Cloud shell to enable the OKE access.
  • Follow the instruction via Access Cluster tab for the OKE cluster.

  • Validate the kubernetes access using kubectl get nodes & kubectl config view.

kubectl create clusterrolebinding oke_cluster_role_<username> --clusterrole=cluster-admin --user=ocid1.user.oc1..xxx

kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/controller-v1.1.2/deploy/static/provider/cloud/deploy.yaml
  • Create and save the file cloud-generic.yaml containing the following code to define the ingress-nginx ingress controller service as a load balancer service.
kind: Service
apiVersion: v1
metadata:
  name: ingress-nginx
  namespace: ingress-nginx
  labels:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx
spec:
  type: LoadBalancer
  selector:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx
  ports:
    - name: http
      port: 80
      targetPort: http
    - name: https
      port: 443
      targetPort: https
  • Using the file you just saved, create the ingress-nginx ingress controller service by running the following command.
kubectl apply -f cloud-generic.yaml
  • You may follow the procedure to create a TLS certificate for nginx.
openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout tls.key -out tls.crt -subj "/CN=nginxsvc/O=nginxsvc"
kubectl create secret tls tls-secret --key tls.key --cert tls.crt

  • You may skip the sample application example in the procedure.

  • Validate the installation.

kubectl get svc -n ingress-nginx
  • The EXTERNAL-IP for the ingress-nginx ingress controller service is shown as pending until the load balancer has been fully created in Oracle Cloud Infrastructure.Repeat the kubectl get svc command until an EXTERNAL-IP is shown for the ingress-nginx ingress controller service.

  • Create two new namespaces for the deployment.
kubectl create ns ns-blue;kubectl create ns  ns-green
  • Go back to build pipeline and do click Start manual run.

  • Wait untill all the build stages completed.

  • Switch to the deployment pipeline and click on the deployment which is in progress.

  • The pipeline will be pending for Approval stage.
  • Validate the first deployment at this stage.You should see a valid deployments at namespace ns-green.
for i in ns-green ns-blue ; do echo "-- NS:$i --";kubectl get po,ing -n $i; done

  • Click on the 3 dots and validate the Control:Approval stage.

  • Wait for all the steps to complete.

  • Validate the deployment using the Ingress Address.
curl -k http://<Ingress Address>
  • Edit the source code - main.py and change the version to 0.1 and run the build pipeline again to test a new deployment scenario.
from typing import Optional

from fastapi import FastAPI

import os

app = FastAPI()


@app.get("/")
def read_root():
    version="0.0"
    namespace = os.getenv('POD_NAMESPACE', default = 'ns-red')
    return {"Message": "with Love from OCI Devops ","Version":version,"Namespace":namespace}
  • Go back to build pipeline and do click Start manual run.

  • Wait untill all the build stages completed.

  • Switch to the deployment pipeline and click on the deployment which is in progress.

  • The pipeline will be pending for Approval stage.
  • Validate the first deployment at this stage.You should see a valid deployments at namespace ns-blue too.
for i in ns-green ns-blue ; do echo "-- NS:$i --";kubectl get po,ing -n $i; done

  • Validate the deployment using the Ingress Address.
curl -k http://<Ingress Address>

Output :

{"Message":"with Love from OCI Devops ","Version":"0.1","Namespace":"ns-blue"}

  • You can continue other re-run from build pipeline and validate the switch between environment.

  • Let us now try a Manul roleback.

  • Use the 3 dots at the stage Traffic Shift stage and select Manual Rollback.

  • Select a previously sucessful deployment.

  • Close the select deployment page and click Rollback Stage option.

  • Wait for stage to complete .

  • Validate the deployment using the Ingress Address.
curl -k http://<Ingress Address>

Output :

{"Message":"with Love from OCI Devops ","Version":"0.0","Namespace":"ns-green"}

Note : Re-Run of deployment pipeline with OKE Blue-Green stage is not supported for now.

Read more

Contributing

This project is open source. Please submit your contributions by forking this repository and submitting a pull request! Oracle appreciates any contributions that are made by the open source community.

License

Copyright (c) 2022 Oracle and/or its affiliates.

Licensed under the Universal Permissive License (UPL), Version 1.0.

See LICENSE for more details.

ORACLE AND ITS AFFILIATES DO NOT PROVIDE ANY WARRANTY WHATSOEVER, EXPRESS OR IMPLIED, FOR ANY SOFTWARE, MATERIAL OR CONTENT OF ANY KIND CONTAINED OR PRODUCED WITHIN THIS REPOSITORY, AND IN PARTICULAR SPECIFICALLY DISCLAIM ANY AND ALL IMPLIED WARRANTIES OF TITLE, NON-INFRINGEMENT, MERCHANTABILITY, AND FITNESS FOR A PARTICULAR PURPOSE. FURTHERMORE, ORACLE AND ITS AFFILIATES DO NOT REPRESENT THAT ANY CUSTOMARY SECURITY REVIEW HAS BEEN PERFORMED WITH RESPECT TO ANY SOFTWARE, MATERIAL OR CONTENT CONTAINED OR PRODUCED WITHIN THIS REPOSITORY. IN ADDITION, AND WITHOUT LIMITING THE FOREGOING, THIRD PARTIES MAY HAVE POSTED SOFTWARE, MATERIAL OR CONTENT TO THIS REPOSITORY WITHOUT ANY REVIEW. USE AT YOUR OWN RISK.

Contributors

  • Author : Rahul M R
  • Colloboroators : NA
  • Last release : March 2022

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python-oci-bluegreen-oke-app

License:Universal Permissive License v1.0

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