Pega requires re-authenticating to download Docker images from its repository. As a Linux user, you can set up an authentication file to store your credentials for the Pega Docker repository. In this way, you can use the file with Docker commands to conveniently authenticate your identity when you download a new image.

1. In a Linux bash shell with root privileges, in the /home/<Linux_username>/ folder, create a .docker directory.
2. In the /home/<Linux_username>/.docker/ folder, create a config.json file.
3. In the terminal window, encode your user ID and API access key in base64 by entering echo -n'<ID> :<key>' | base64
   The variables have the following values:<ID> is the user ID that you receive in an email from Pega Delivery.<key> is the access key that you receive in an email from Pega Delivery.
4. In the config.json file that you created in step 2, enter the following code:

   {
   	"auths": {
   		"pega-docker.downloads.pega.com": {
   			"auth": "<encoded_ID_and_key>"
   		}
   	}
   }
   

   <encoded_ID_and_key> is the string that you generated in step 3.
   Important: You must paste the encoded ID and key in a single line in the config.json file.
5. Save the file.