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Co-authored-by: katexochen <katexochen@users.noreply.github.com> |
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README.md |
Join Service
Implementation for Constellation's node flow to join an existing cluster.
The join service runs on each control-plane node of the Kubernetes cluster. New nodes (at cluster start, or later through autoscaling) send an IssueJoinTicket request to the service over aTLS. The join service verifies the new nodes certificate and attestation statement. If attestation is successful, the new node is supplied with a disk encryption key for its state disk, and a Kubernetes bootstrap token, so it may join the cluster.
Packages
joinproto
Proto definitions for the join service.
internal/server
The server
implements gRPC endpoints for joining the cluster and holds the main application logic.
Connections between the join service and joining nodes are secured using aTLS
sequenceDiagram
participant New Node
participant Join Service
New Node-->>Join Service: aTLS Handshake (server side verification)
Join Service-->>New Node: #
New Node->>+Join Service: grpc::IssueJoinTicket(DiskUUID, NodeName, IsControlPlane)
Join Service->>+KMS: grpc::GetDataKey(DiskUUID)
KMS->>-Join Service: DiskEncryptionKey
Join Service->>-New Node: [DiskEncryptionKey, KubernetesJoinToken, ...]
internal/kms
Implements interaction with Constellation's keyservice. This is needed for fetching data encryption keys for joining nodes.
internal/kubeadm
Implements interaction with the Kubernetes API to create join tokens for new nodes.
Dockerfile
export VERSION=0.0.0
DOCKER_BUILDKIT=1 docker build --build-arg PROJECT_VERSION=${VERSION} -t ghcr.io/edgelesssys/constellation/join-service:v${VERSION} -f joinservice/Dockerfile .