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Blue green strategy - Refined some details. (#51)

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* Refined some details.

* addressed comments

* updates readme

* Readme cleanup (#1)

* Small updates to readme

* added identified service terminology

* Adressed PR comments

* Added workflow to trigger L2 tests

* Renamed workflow file name

* Trigger integration tests through script and disable post check-in trigger.

Co-authored-by: Anirudh Raghunath <46741940+anraghun@users.noreply.github.com>
Co-authored-by: ajinkya599 <11447401+ajinkya599@users.noreply.github.com>
This commit is contained in:
Sundar
2020-09-17 12:22:14 +05:30
committed by GitHub
parent d394c2bba2
commit 29552c24a9
14 changed files with 350 additions and 327 deletions
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src/utilities/strategy-helpers/service-blue-green-helper.ts
+19 -30
View File
@@ -2,18 +2,18 @@
import { Kubectl } from '../../kubectl-object-model';
import * as fileHelper from '../files-helper';
import { createWorkloadsWithLabel, getManifestObjects, addBlueGreenLabelsAndAnnotations, fetchResource, deleteWorkloadsWithLabel, cleanUp, isServiceRouted } from './blue-green-helper';
import { createWorkloadsWithLabel, getManifestObjects, addBlueGreenLabelsAndAnnotations, fetchResource, deleteWorkloadsWithLabel, BlueGreenManifests } from './blue-green-helper';
import { GREEN_LABEL_VALUE, NONE_LABEL_VALUE, BLUE_GREEN_VERSION_LABEL } from './blue-green-helper';
export function deployBlueGreenService(kubectl: Kubectl, filePaths: string[]) {
// get all kubernetes objects defined in manifest files
const manifestObjects = getManifestObjects(filePaths);
const manifestObjects: BlueGreenManifests = getManifestObjects(filePaths);
// create deployments with green label value
const result = createWorkloadsWithLabel(kubectl, manifestObjects.deploymentEntityList, GREEN_LABEL_VALUE);
// create other non deployment and non service entities
const newObjectsList = manifestObjects.otherObjects.concat(manifestObjects.ingressEntityList);
const newObjectsList = manifestObjects.otherObjects.concat(manifestObjects.ingressEntityList).concat(manifestObjects.unroutedServiceEntityList);
const manifestFiles = fileHelper.writeObjectsToFile(newObjectsList);
kubectl.apply(manifestFiles);
@@ -23,7 +23,7 @@ export function deployBlueGreenService(kubectl: Kubectl, filePaths: string[]) {
export async function promoteBlueGreenService(kubectl: Kubectl, manifestObjects) {
// checking if services are in the right state ie. targeting green deployments
if (!validateServicesState(kubectl, manifestObjects.deploymentEntityList, manifestObjects.serviceEntityList)) {
if (!validateServicesState(kubectl, manifestObjects.serviceEntityList)) {
throw('NotInPromoteState');
}
@@ -36,29 +36,20 @@ export async function promoteBlueGreenService(kubectl: Kubectl, manifestObjects)
export async function rejectBlueGreenService(kubectl: Kubectl, filePaths: string[]) {
// get all kubernetes objects defined in manifest files
const manifestObjects = getManifestObjects(filePaths);
const manifestObjects: BlueGreenManifests = getManifestObjects(filePaths);
// routing to stable objects
routeBlueGreenService(kubectl, NONE_LABEL_VALUE, manifestObjects.deploymentEntityList, manifestObjects.serviceEntityList);
routeBlueGreenService(kubectl, NONE_LABEL_VALUE, manifestObjects.serviceEntityList);
// seeing if we should even delete the service
cleanUp(kubectl, manifestObjects.deploymentEntityList, manifestObjects.serviceEntityList);
// deleting the new deployments with green suffix
deleteWorkloadsWithLabel(kubectl, GREEN_LABEL_VALUE, manifestObjects.deploymentEntityList);
}
export function routeBlueGreenService(kubectl: Kubectl, nextLabel: string, deploymentEntityList: any[], serviceEntityList: any[]) {
export function routeBlueGreenService(kubectl: Kubectl, nextLabel: string, serviceEntityList: any[]) {
const newObjectsList = [];
serviceEntityList.forEach((serviceObject) => {
if (isServiceRouted(serviceObject, deploymentEntityList)) {
// if service is routed, point it to given label
const newBlueGreenServiceObject = getUpdatedBlueGreenService(serviceObject, nextLabel);
newObjectsList.push(newBlueGreenServiceObject);
} else {
// if service is not routed, just push the original service
newObjectsList.push(serviceObject);
}
const newBlueGreenServiceObject = getUpdatedBlueGreenService(serviceObject, nextLabel);
newObjectsList.push(newBlueGreenServiceObject);
});
// configures the services
const manifestFiles = fileHelper.writeObjectsToFile(newObjectsList);
@@ -73,22 +64,20 @@ function getUpdatedBlueGreenService(inputObject: any, labelValue: string): objec
return newObject;
}
export function validateServicesState(kubectl: Kubectl, deploymentEntityList: any[], serviceEntityList: any[]): boolean {
export function validateServicesState(kubectl: Kubectl, serviceEntityList: any[]): boolean {
let areServicesGreen: boolean = true;
serviceEntityList.forEach((serviceObject) => {
if (isServiceRouted(serviceObject, deploymentEntityList)) {
// finding the existing routed service
const existingService = fetchResource(kubectl, serviceObject.kind, serviceObject.metadata.name);
if (!!existingService) {
let currentLabel: string = getServiceSpecLabel(existingService);
if(currentLabel != GREEN_LABEL_VALUE) {
// service should be targeting deployments with green label
areServicesGreen = false;
}
} else {
// service targeting deployment doesn't exist
// finding the existing routed service
const existingService = fetchResource(kubectl, serviceObject.kind, serviceObject.metadata.name);
if (!!existingService) {
let currentLabel: string = getServiceSpecLabel(existingService);
if(currentLabel != GREEN_LABEL_VALUE) {
// service should be targeting deployments with green label
areServicesGreen = false;
}
} else {
// service targeting deployment doesn't exist
areServicesGreen = false;
}
});
return areServicesGreen;