kubernetes-the-hard-way/docs/06-data-encryption-keys.md

Generating the Data Encryption Config and Key

Kubernetes stores a variety of data including cluster state, application configurations, and secrets. Kubernetes supports the ability to encrypt cluster data at rest.

In this lab you will generate an encryption key and an encryption config suitable for encrypting Kubernetes Secrets.

The Encryption Key

Generate an encryption key:

$ ENCRYPTION_KEY=$(head -c 32 /dev/urandom | base64)

The Encryption Config File

Create the encryption-config.yaml encryption config file:

$ cat > encryption-config.yaml <<EOF
kind: EncryptionConfig
apiVersion: v1
resources:
  - resources:
      - secrets
    providers:
      - aescbc:
          keys:
            - name: key1
              secret: ${ENCRYPTION_KEY}
      - identity: {}
EOF

Copy the encryption-config.yaml encryption config file to each master instance:

$ aws ec2 describe-instances --filters Name=vpc-id,Values=vpc-xxxxxxxxxxxxxxxxx \
  --query 'Reservations[].Instances[].[Tags[?Key==`Name`].Value | [0],InstanceId,Placement.AvailabilityZone,PrivateIpAddress,PublicIpAddress,State.Name]' \
  --output text | sort | grep master
master-0        i-xxxxxxxxxxxxxxxxx     ap-northeast-1c 10.240.0.10     xx.xxx.xxx.xxx  running
master-1        i-yyyyyyyyyyyyyyyyy     ap-northeast-1c 10.240.0.11     yy.yyy.yyy.yy   running
master-2        i-zzzzzzzzzzzzzzzzz     ap-northeast-1c 10.240.0.12     zz.zzz.z.zzz    running

for masternode in xx.xxx.xxx.xxx yy.yyy.yyy.yy zz.zzz.z.zzz; do
  scp -i ~/.ssh/your_ssh_key \
    encryption-config.yaml \
    ubuntu@${masternode}:~/
done

Next: Bootstrapping the etcd Cluster