Registry Credentials

Allow for Registry credentials to be refreshed inside your Kubernetes cluster via ImagePullSecrets.

How it works

1. The tool runs as a pod in the kube-system namespace.

• It gets credentials from AWS ECR, Google Container Registry, Docker private registry, or Azure Container Registry.
• Next it creates a secret with credentials for your registry
• Then it sets up this secret to be used in the ImagePullSecrets for the default service account
• Whenever a pod is created, this secret is attached to the pod
• The container will refresh the credentials by default every 60 minutes
• Enabled for use with Minikube as an addon

NOTE: This will setup credentials across ALL namespaces!

Parameters

The following parameters are driven via Environment variables.

• Environment Variables:
  • AWS_ACCESS_KEY_ID / AWS_SECRET_ACCESS_KEY: Credentials to access AWS.
  • awsaccount: Comma separated list of AWS Account Ids.
  • awsregion: (optional) Can override the default AWS region by setting this variable.
  • aws-assume-role (optional) can provide a role ARN that will be assumed for getting ECR authorization tokens

    Note: The region can also be specified as an arg to the binary.

  • TOKEN_RETRY_TYPE: The type of Timer to use when getting a registry token fails and must be retried; "simple" or "exponential" (default: simple)
  • TOKEN_RETRIES: The number of times to retry getting a registry token if an error occurred (default: 3)
  • TOKEN_RETRY_DELAY: The number of seconds to delay between successive retries at getting a registry token; applies to "simple" retry timer only (default: 5)
  • GCRURL: URL to Google Container Registry
  • DOCKER_PRIVATE_REGISTRY_SERVER, DOCKER_PRIVATE_REGISTRY_USER, DOCKER_PRIVATE_REGISTRY_PASSWORD: the URL, user name, and password for a Docker private registry
  • ACR_URL, ACR_CLIENT_ID, ACR_PASSWORD: the registry URL, client ID, and password to access to access an Azure Container Registry.

How to setup running in AWS

1. Clone the repo and navigate to directory

2. Configure

   1. If running on AWS EC2, make sure your EC2 instances have the following IAM permissions:

      {
       "Effect": "Allow",
        "Action": [
         "ecr:GetAuthorizationToken",
         "ecr:BatchCheckLayerAvailability",
         "ecr:GetDownloadUrlForLayer",
         "ecr:GetRepositoryPolicy",
         "ecr:DescribeRepositories",
         "ecr:ListImages",
         "ecr:BatchGetImage"
       ],
       "Resource": "*"
      }

   2. If you are not running in AWS Cloud, then you can still use this tool! Edit & create the sample secret and update values for AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY, aws-account, and aws-region (base64 encoded).

      echo -n "secret-key" | base64
      
      kubectl create -f k8s/secret.yaml

3. Create the replication controller.

   kubectl create -f k8s/replicationController.yaml

   NOTE: If running on premise, no need to provide AWS_ACCESS_KEY_ID or AWS_SECRET_ACCESS_KEY since that will come from the EC2 instance.

4. Use awsecr-cred for name of imagePullSecrets on your deployment.yaml file.

How to setup running in GCR

1. Clone the repo and navigate to directory

2. Input your application_default_credentials.json information into the secret.yaml template located here: The value for application_default_credentials.json can be obtained with the following command:

   base64 -w 0 $HOME/.config/gcloud/application_default_credentials.json

3. Create the secret in kubernetes

   kubectl create -f k8s/secret.yml

4. Create the replication controller:

   kubectl create -f k8s/replicationController.yaml

How to setup running in Docker Private Registry

1. Clone the repo and navigate to directory

2. Edit the sample secret and update values for DOCKER_PRIVATE_REGISTRY_SERVER, DOCKER_PRIVATE_REGISTRY_USER, and DOCKER_PRIVATE_REGISTRY_PASSWORD (base64 encoded).

   echo -n "secret-key" | base64

3. Create the secret in kubernetes

   kubectl create -f k8s/secret.yml

4. Create the replication controller:

   kubectl create -f k8s/replicationController.yaml

How to set up Azure Container Registry

1. Create a service principal that your Kubernetes cluster will use to access the registry.

2. Clone the repo and navigate to the repo root

3. Edit the sample secret and update values for ACR_URL, ACR_CLIENT_ID, and ACR_PASSWORD (base64 encoded). Use service principal application ID as the client ID, and service principal password (client secret) as the password.

   echo -n "secret-key" | base64

4. Create the secret in kubernetes

   kubectl create -f k8s/secret.yml

5. Create the replication controller:

   kubectl create -f k8s/replicationController.yaml

DockerHub Image

• upmcenterprises/registry-creds

Developing Locally

If you want to hack on this project:

1. Clone the repo
2. Build: make build
3. Test: make test
4. Run on your machine: go run ./main.go --kubecfg-file=<pathToKubecfgFile>

About

Built by UPMC Enterprises in Pittsburgh, PA. http://enterprises.upmc.com/