Created HowToPushImageToECR Markdown

Author: hadiparsianNIH

docs/HowToPushImageToECR.md

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+# Pushing Public Docker Images to Private ECR
+
+We will go through how to push a public docker image to a private repository in Elastic Container Registry.
+
+## Part 1: Pull a Docker image
+
+* In AWS console, In a notebook instance, Open JupyterLab:
+
+  ![](../images/ECR/5.PNG)
+
+* Open Terminal:
+
+  ![](../images/ECR/6.PNG)
+
+* Pull a Docker iamge: `docker pull public.ecr.aws/v8e3m3v4/sagemaker-studio/r:latest`
+
+  ![](../images/ECR/7.PNG)
+
+## Part 2: Create a repository in ECR
+
+* In AWS console, type *ECR* in search bar and then click **Elastic Container Registry**:
+
+  ![](../images/ECR/1.PNG)
+
+* Click **Create repository**:
+
+  ![](../images/ECR/2.PNG)
+
+* Give a name and then create the repository:
+
+  ![](../images/ECR/3.PNG)
+
+* Copy URI of your repository for the next part:
+
+  ![](../images/ECR/4.PNG)
+
+## Part 3: Push Docker image to ECR
+
+* Retrieve an authentication token and authenticate your Docker client to your registry:
+
+`aws ecr get-login-password --region us-east-1 | docker login --username AWS --password-stdin 664418964547.dkr.ecr.us-east-1.amazonaws.com/sagemaker/r-kernel`
+
+![](../images/ECR/8.PNG)
+
+* Tag your image so you can push the image to this repository:
+
+`docker tag public.ecr.aws/v8e3m3v4/sagemaker-studio/r:latest 664418964547.dkr.ecr.us-east-1.amazonaws.com/sagemaker/r-kernel:latest`
+
+![](../images/ECR/9.PNG)
+
+* Run the following command to push this image to your newly created AWS repository:
+
+`docker push 664418964547.dkr.ecr.us-east-1.amazonaws.com/sagemaker/r-kernel:latest`
+
+![](../images/ECR/10.PNG)