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Have been running Docker with Elastic Beanstalk to deploy a relatively simple app, and it has been working great. Now with ECS on the horizon, I am interested to know what the differences are between the two services, and why one might use one over the other?
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Amazon ECS provides tools to manage a cluster of instances running Docker containers. Elastic Beanstalk takes care of Amazon ECS tasks including cluster creation, task definition and execution. Each of the instances in the environment run the same set of containers, which are defined in a Dockerrun. aws.
Amazon EC2 instances in a ECS managed Docker environment on Elastic Beanstalk run an agent process in a Docker container. This agent connects to the Amazon ECS service in order to coordinate container deployments. These deployments run as tasks in Amazon ECS, which are configured in task definition files.
In the case that you want to reduce system operations and just focus on the website, then Elastic Beanstalk would be the best choice for that. Elastic Beanstalk supports a PHP stack (as well as others). You can keep your site in version control and easily deploy to your environment whenever you make changes.
Elastic Beanstalk supports the deployment of web applications from Docker containers. With Docker containers, you can define your own runtime environment.
Amazon's documentation says the following:
Q: How is Amazon ECS different from AWS Elastic Beanstalk?
AWS Elastic Beanstalk is an application management platform that helps customers easily deploy and scale web applications and services. It keeps the provisioning of building blocks (e.g., EC2, RDS, Elastic Load Balancing, Auto Scaling, CloudWatch), deployment of applications, and health monitoring abstracted from the user so they can just focus on writing code. You simply specify which container images are to be deployed, the CPU and memory requirements, the port mappings, and the container links. Elastic Beanstalk will automatically handle all the details such as provisioning an Amazon ECS cluster, balancing load, auto-scaling, monitoring, and placing your containers across your cluster. Elastic Beanstalk is ideal if you want to leverage the benefits of containers but just want the simplicity of deploying applications from development to production by uploading a container image. You can work with Amazon ECS directly if you want more fine-grained control for custom application architectures.
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