This project allows you to create a docker image for creating a maintenance-service. You can deploy this in any orchestration tool and with few tweeks to your deployment stage you can provide user a under maintenance response.

This repository has default.conf file. This file has nginx related configuration. It has following configuration (you can change it as per your need)

• If request's content type is application/json, then return following json response

{"code":"503", "message": "Under Maintenance"}

• Else return html (maintenance.html file in repository)

Following changes are required in helm deployment stage if you want to deploy the service along with putting it under maintenance mode

• deploy maintenance image in kubernentes (using helm) Whenever you want to put a service (say service A) to maintenance mode, do following changes to service.yaml of service A
• change spec.selector.app key to point to maintenance
• change spec.ports[].targetPort to 80 (our maintenance listens on port 80)
• Trigger helm upgrade for the service A. This will redirect all requests coming for service A to maintenance deployment
• revert above changes when you want to take your service out of maintenance mode

All above steps can be automated in ci/cd. Above strategy can also be used to put service A under maintenance while deployment