Introduction

Version management process

1. Prepare a function

   When you create a service and its function for the first time, the version of the service is LATEST. You can debug the function for the service of the LATEST version until the function runs stably.

2. Publish a version

   When the service of the LATEST version becomes stable, you can publish the service of this stable version to serve online requests.

3. Switch traffic by using an alias

   After a version is published, you can create an alias and point the alias to the version. When this version is updated, you only need to change the version to which the alias points to the new version. In this way, the caller is freed from needing to know the specific version of the service, but only need to use the correct alias. If a trigger is created for your function, you only need to associate the trigger with the alias. Changing the version does not affect the use of the trigger.

View the version of a function

module.exports.handler = function(eventBuf, context, callback) {
    var qualifier = context['service']['qualifier']
    var versionId = context['service']['versionId']
    console.log('Qualifier from context:', qualifier);
    console.log('VersionId from context:', versionId);
    callback(null, null);
};