ACR image building and pushing in Azure - Step-by-Step Execution

Process Flow - ACR image building and pushing

Write Dockerfile

↓

Build Docker Image

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Login to ACR

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Tag Image with ACR Repo

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Push Image to ACR

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Image Stored in ACR

This flow shows the steps to build a Docker image locally, log in to Azure Container Registry (ACR), tag the image for ACR, and push it to store in the registry.

Execution Sample

Azure

az acr login --name myRegistry
docker build -t myapp:v1 .
docker tag myapp:v1 myRegistry.azurecr.io/myapp:v1
docker push myRegistry.azurecr.io/myapp:v1

This code logs into ACR, builds the Docker image locally from the current folder, tags it for ACR, and pushes it to ACR with the tag 'myapp:v1'.

Process Table

Step	Action	Command/Process	Result/Output
1	Login to ACR	az acr login --name myRegistry	Authenticated to myRegistry
2	Build and push image	docker build -t myapp:v1 . docker tag myapp:v1 myRegistry.azurecr.io/myapp:v1 docker push myRegistry.azurecr.io/myapp:v1	Image built locally and pushed to myRegistry/myapp:v1
3	Verify image	az acr repository show-tags --name myRegistry --repository myapp	Tags: v1
4	Exit	No further commands	Image available in ACR for deployments

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Status Tracker

Variable	Start	After Login	After Build & Push	Final
Authentication Status	Not logged in	Logged in	Logged in	Logged in
Local Image	Not built	Not built	Built	Built
ACR Image Tags	None	None	v1	v1

Key Moments - 3 Insights

Why do we need to login to ACR before pushing the image?

Logging in authenticates your local machine with ACR, allowing secure push access. See execution_table step 1 where login happens before build and push.

What happens if the image is not tagged correctly with the ACR repository?

The push will fail or go to the wrong place. Tagging with the ACR repo name ensures the image is pushed to the right registry, as shown in step 2.

How do we confirm the image is in ACR after pushing?

By listing tags in the repository using 'az acr repository show-tags', as shown in step 3, confirming the image tag exists.

Visual Quiz - 3 Questions

Look at the execution_table, what is the result after step 1?

A Image pushed to ACR

B Image built locally

C Authenticated to myRegistry

D No authentication

💡 Hint

Check the 'Result/Output' column for step 1 in execution_table.

At which step is the image actually pushed to ACR?

A Step 2

B Step 3

C Step 1

D Step 4

💡 Hint

Look at the 'Action' and 'Result/Output' columns in execution_table for when push happens.

If you skip the login step, what variable in variable_tracker would remain unchanged?

A Local Image

B Authentication Status

C ACR Image Tags

D Final

💡 Hint

Check 'Authentication Status' changes in variable_tracker after login.

Concept Snapshot

ACR Image Build & Push:
1. Login to ACR with 'az acr login'.
2. Build image locally, tag with ACR repo name, and push using Docker CLI.
3. Verify image with 'az acr repository show-tags'.
This process stores your container image securely in Azure.

Full Transcript

To build and push a container image to Azure Container Registry (ACR), first write your Dockerfile. Then login to your ACR using 'az acr login --name yourRegistry'. Next, build the image locally with 'docker build -t yourImage:tag .', tag it with 'docker tag yourImage:tag yourRegistry.azurecr.io/yourImage:tag', and push it with 'docker push yourRegistry.azurecr.io/yourImage:tag'. These commands build the image locally and push it to your ACR. Finally, verify the image is stored by listing tags with 'az acr repository show-tags'. This sequence ensures your image is ready for deployment from ACR.