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 Docker vs Terraform: What are the differences?

What is Docker?

Docker is a set of the platform as a service products that use OS-level virtualization to deliver software in packages called containers. The service has both free and premium tiers. The software that hosts the containers is called Docker Engine. DevOps Training

What is Terraform?

 Terraform is an open-source infrastructure-as-code software tool created by Hashicorp. Users define and provide data center infrastructure using a declarative configuration language known as Hashicorp.

Docker and Terraform are primarily classified as "Virtual Machine Platforms & Containers" and "Infrastructure Build" tools respectively. 

Some of the features offered by Docker are:

• Integrated developer tools
• open, portable images
• shareable, reusable apps

On the other hand, Terraform provides the following key features:

• Infrastructure as Code: Infrastructure is described using a high-level configuration syntax. This allows a blueprint of your data center to be versioned and treated as you would any other code. Additionally, infrastructure can be shared and re-used. 
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• Execution Plans: Terraform has a "planning" step where it generates an execution plan. The execution plan shows what Terraform will do when you call to apply. This lets you avoid any surprises when Terraform manipulates infrastructure.
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• Resource Graph: Terraform builds a graph of all your resources, and parallelizes the creation and modification of any non-dependent resources. Because of this, Terraform builds infrastructure as efficiently as possible, and operators get insight into dependencies in their infrastructure.

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