Kubernetes Persistent Volume Backup / AWS

What it does

After being seeded with a variable namespace and app name (set as environment variables), this script will navigate through the Kubernetes api, and locate any underlying Persistent Volumes and create a snapshot of each of these volumes.

Presently, only AWS is supported.

How it works

Running externally (non Docker image)

• The script will authenticate with AWS and K8 by looking for ~/.aws/credentials and ~/.kube/config respectively.

Running within Kubernetes cluster

• The script will authenticate with Kubernetes by using the local service account token attached to the pod that is deployed. See Accessing API from a Pod
• The script will authenticate with AWS via a secret which will mount a config and credentials file to /root/.aws For this, a secret will have to already of been created. One method of creating this secret would be via Kubectl:

kubectl create secret --namespace=dev generic aws-key-secret --from-file=config=$HOME/.aws/config --from-file=credentials=$HOME/.aws/credentials

Usage

External usage (non Docker image)

• Ensure $HOME/.aws/ & $HOME/.kube/ store the appropriate credentials to your environment.

Running manually with Python (2.7)

• From command line, run:
  • export $K8_NAMESPACE=<<your namespace>>
  • export $K8_APP_NAME=<<the application name>>
• From the root of this project:
  • Install dependencies:
    • pip install -r ./requirements.txt
  • Launch the script:
    • python -m kubernetes-pvc-snapshot

Running via Docker image

• Use the following command to run the docker image from your local environment:

docker run -e K8_NAMESPACE="your-namespace" -e K8_APP_NAME="your-app-name" -v $HOME/.kube:/root/.kube/ -v $HOME/.aws:/root/.aws boysherman/kubernetes-snapshots

Internal (within the K8 cluster) usage

Helm Deployment (via CLI)

• Ensure aws 'secret' has been created on the cluster (see above How it works: running within Kubernetes cluster)
• in ./templates/helm/kubernetes-pvc-snapshot/values.yaml, update the following values:
  • env.name_space
  • env.app_name
  • secret_name
• Package the helm chart. From within ./templates/helm, run: helm package kubernetes-pvc-snapshot
• Deploy the helm chart. helm install kubernetes-pvc-snapshot

Standard K8 Deployment

To create a standard Kubernetes 'job':

• Provide a value to the keys K8_NAMESPACE & K8_APP_NAME in ./templates/k8/kubernetes-volume-snapshot.yml
• Create a new job via CLI:

kubectl --namespace dev create -f ./templates/k8/job--cassandra-backup.yml