Fastest Autoscaling for Application Instances
Question
You are currently planning to use Autoscaling to launch instances that have an application installed.
Which of the following methods will help ensure the instances are up and running in the shortest span of time to take in traffic from the users?
Answers
Explanations
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A. B. C. D.Answer - D.
The AMI will be the fastest because it will already have the software installed.
You can customize the instance that you launch from a public AMI and then save that configuration as a custom AMI for your own use.
Instances that you launch from your AMI use all the customizations that you've made.
For more information on AMI's, please refer to the below link.
http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/AMIs.htmlOption A (Log into each instance and install the software) is not recommended in this scenario since it is time-consuming and error-prone. Manually logging into each instance and installing the software would take a considerable amount of time, especially when dealing with a large number of instances.
Option B (Use UserData to launch scripts to install the software) is a better choice. UserData is a script that is executed during the boot process of an instance. Using UserData, we can automate the installation of software on instances launched by Auto Scaling. This method is faster, less error-prone, and allows for the automation of the software installation process.
Option C (Use Docker containers to launch the software) is also a viable choice. Docker containers provide a lightweight and portable way to package and distribute software. By using Docker containers, we can launch instances that already have the software installed, which can help reduce the time required to prepare instances for use.
Option D (Use AMIs which already have the software installed) is also a valid option. AMIs (Amazon Machine Images) are pre-configured images that can be used to launch EC2 instances. By using AMIs that already have the required software installed, we can reduce the time required to prepare instances for use.
However, Option B (Use UserData to launch scripts to install the software) is the best choice since it is the most flexible option that allows for easy updates and modifications to the software installation process. Additionally, it is recommended to use a combination of Options B, C, and D to optimize the process of launching instances that have the application installed.
