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20160509 CoreOSFest 2

20160509_CoreOSFest-2

• 1 - Intro
• Weave
• Weave topology
• Raft
• 2 - Add ETCD for discovery
• ETCD
• Gossip / Raft implementation

EtcD over gossip protocol

1 - Intro

Weave

Weave networks for containers
- Docker initialy
- CNI plugin for Kube / DCOS

Weave topology

• Router
• Meshed network
• Gossip Layer (between routers)
• Receiver
• sender
• Your application
• Talks to the Gossip Communication protocol

Raft

Raft is a Consensus protocol

2 - Add ETCD for discovery

ETCD

Expected Stack:
1. API
2. “Mechanical Bits”
3. Storage
4. “Propose Layer”
5. Raft
6. Transport

Reality:
- Not clearly decoupled
- Not easy programable API
-> Will have to reimplment a Raft server node …

Gossip / Raft implementation

In ETCD:
* Raft “nodes” are supposed persistant
* Raft “nodes” are identified

Wants “Ephemeral” behavior
-> Implement new NodeName ID as UUID at start-up