# AWS Elastic Beanstalk deployment strategies
<a name="aeb-deployment-strategies"></a>

[AWS Elastic Beanstalk](https://aws.amazon.com/elasticbeanstalk/) supports the following type of deployment strategies:
+ **All-at-once** Performs in place deployment on all instances.
+ **Rolling** Splits the instances into batches and deploys to one batch at a time. 
+ **Rolling with additional batch** Splits the deployments into batches but for the first batch creates new EC2 instances instead of deploying on the existing EC2 instances. 
+ **Immutable** If you need to deploy with a new instance instead of using an existing instance. 
+ **Traffic splitting** Performs immutable deployment and then forwards percentage of traffic to the new instances for a pre-determined duration of time. If the instances stay healthy, then forward all traffic to new instances and shut down old instances.