- A
A call to the AWS CodeDeploy API to push the image.
Why wrong: CodeDeploy does not push images.
- B
An invocation of the AWS ECS RunTask API.
Why wrong: That runs a task, not pushes an image.
- C
A buildspec phase with 'ecr-push' action.
Why wrong: No such action exists; you must use shell commands.
- D
Docker build and docker push commands with AWS CLI to authenticate to ECR.
Standard approach: build, tag, and push to ECR.
Question 1,596 of 1,750
How to Push a Docker Image to ECR in CodeBuild
This DOP-C02 practice question tests your understanding of sdlc automation. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A DevOps engineer is tasked with automating the deployment of a microservices architecture. Each service is packaged as a Docker container. The team wants to use AWS CodePipeline and AWS CodeBuild to build Docker images and push them to Amazon ECR, then deploy to Amazon ECS. What should the CodeBuild buildspec file include to push the image to ECR?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Docker build and docker push commands with AWS CLI to authenticate to ECR.
Option D is correct because to push a Docker image to Amazon ECR, the buildspec must first authenticate Docker to the ECR registry using the AWS CLI's `aws ecr get-login-password` command piped to `docker login`, then build the image with `docker build`, tag it with the ECR repository URI, and finally push it with `docker push`. CodeBuild does not have a built-in 'ecr-push' action; it relies on executing these standard Docker and AWS CLI commands in the build phases.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
A call to the AWS CodeDeploy API to push the image.
Why it's wrong here
CodeDeploy does not push images.
- ✗
An invocation of the AWS ECS RunTask API.
Why it's wrong here
That runs a task, not pushes an image.
- ✗
A buildspec phase with 'ecr-push' action.
Why it's wrong here
No such action exists; you must use shell commands.
- ✓
Docker build and docker push commands with AWS CLI to authenticate to ECR.
Why this is correct
Standard approach: build, tag, and push to ECR.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may assume CodeBuild has a native 'ecr-push' action or that ECS APIs are involved in image pushing, when in fact the process relies on standard Docker commands and AWS CLI authentication within the buildspec.
Trap categories for this question
Command / output trap
No such action exists; you must use shell commands.
Detailed technical explanation
How to think about this question
Under the hood, `aws ecr get-login-password` retrieves a temporary authentication token valid for 12 hours, which Docker uses via `--password-stdin` to authenticate to the ECR registry. The image must be tagged with the full ECR repository URI (e.g., `aws_account_id.dkr.ecr.region.amazonaws.com/my-repo:tag`) before pushing, and CodeBuild's default Docker daemon handles the layer-by-layer upload to ECR over HTTPS. A real-world scenario where this matters is when using multi-account ECR cross-account access, requiring additional IAM permissions and the `--registry-ids` flag.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this DOP-C02 question test?
SDLC Automation — This question tests SDLC Automation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Docker build and docker push commands with AWS CLI to authenticate to ECR. — Option D is correct because to push a Docker image to Amazon ECR, the buildspec must first authenticate Docker to the ECR registry using the AWS CLI's `aws ecr get-login-password` command piped to `docker login`, then build the image with `docker build`, tag it with the ECR repository URI, and finally push it with `docker push`. CodeBuild does not have a built-in 'ecr-push' action; it relies on executing these standard Docker and AWS CLI commands in the build phases.
What should I do if I get this DOP-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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