An Education Company Has a Docker-Based Application Running on Multiple

question 341

Multiple Choice

An education company has a Docker-based application running on multiple Amazon EC2 instances in an Amazon ECS cluster. When deploying a new version of the application, the Developer, pushes a new image to a private Docker container registry, and then stops and starts all tasks to ensure that they all have the latest version of the application. The Developer discovers that new tasks are occasionally running with an old image. How can this issue be prevented?

• A) After pushing the new image, restart ECS Agent, and then start the tasks.
• B) Use "latest" for the Docker image tag in the task definition.
• C) Update the digest on the task definition when pushing the new image.
• D) Use Amazon ECR for a Docker container registry.

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Definitions:

Capital Gain

The profit that results from a disposition of a capital asset, such as stock, bond, or real estate, where the sale price exceeds the purchase price.

Arithmetic Average Return

The simple mean of a series of returns over a period of time, calculated by summing the returns and dividing by the number of periods.

Multiyear Period

A span of time that covers more than one year, often used in planning, budgeting, or assessing performance over the long term.

Compound Return

The total amount of money gained or lost on an investment over a specified period, calculated by taking into account the effect of compounding.