{"action":"created","comment":{"url":"https://api.github.com/repos/giantswarm/docs-content/pulls/comments/46544507","id":46544507,"diff_hunk":"@@ -12,30 +12,42 @@ weight = 10\n   <li><a href=\"/fundamentals/architecture/\">Architecture Overview</a></li>\n </ol>\n \n-# Core Nodes\n+# Control Plane\n \n-The core nodes provide an interface to the Giant Swarm platform as well as some basic infrastructure modules.\n+The Control Plane provides an interface to the Giant Swarm platform as well as common infrastructure modules that help manage the Compute Cluster(s). It runs on a cluster of at least 3 nodes to ensure consensus in the service discovery.\n \n <a href=\"/img/architecture_core_nodes.png\" target=\"_blank\"><img src=\"/img/architecture_core_nodes.png\" class=\"img-responsive\" alt=\"Core Nodes\"></a>\n \n <hr>\n \n-## Public Registry\n+## Routing Layer\n+\n+Both the external registry and the API gateway are connected to the Internet through the routing layer which handles the traffic between these two and the loadbalancer.\n+\n+## External Registry\n \n Our registry for storing Docker images as visible to end-users. User credentials are verified via the API gateway and user management services.\n \n-## Private Registry\n+## Internal Registry\n \n-A read-only version of the public registry, which is used to serve Docker images to [compute nodes](/fundamentals/architecture/compute-nodes/).\n+A read-only version of the registry, which uses the same storage backend as the external registry and is used to serve Docker images to [compute clusters](/fundamentals/architecture/compute-cluster/).\n \n ## Service Discovery\n \n The service discovery is used to provide connectivity between linked containers. We provide a [detailed description](/fundamentals/user-services/service-discovery/) in the \"User services behind the scenes\" section.\n \n-## Storage Control Plane\n+## Storage Controller\n \n A set of services, which manage persistent storage volumes and data replication.\n \n+## Scheduler\n+\n+`fleet` is used as a scheduler in the Giant Swarm infrastructure. It schedules user services in form of system.d units onto compute nodes through their respective fleet agents.\n+\n+## Consensus\n+\n+The scheduler uses `etcd` as its distributed key-value store and registers or deregisters the containers there. A Raft consensus algorithm is used to keep consistency guarantees and gracefully handle master elections.","path":"content/fundamentals/architecture/control-plane.md","position":55,"original_position":55,"commit_id":"43684429d746a0f2a3e9f5397da7e4d9d705cf00","original_commit_id":"43684429d746a0f2a3e9f5397da7e4d9d705cf00","user":{"login":"puja108","id":5468872,"avatar_url":"https://avatars.githubusercontent.com/u/5468872?v=3","gravatar_id":"","url":"https://api.github.com/users/puja108","html_url":"https://github.com/puja108","followers_url":"https://api.github.com/users/puja108/followers","following_url":"https://api.github.com/users/puja108/following{/other_user}","gists_url":"https://api.github.com/users/puja108/gists{/gist_id}","starred_url":"https://api.github.com/users/puja108/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/puja108/subscriptions","organizations_url":"https://api.github.com/users/puja108/orgs","repos_url":"https://api.github.com/users/puja108/repos","events_url":"https://api.github.com/users/puja108/events{/privacy}","received_events_url":"https://api.github.com/users/puja108/received_events","type":"User","site_admin":false},"body":"Core OS called it `key-value` store (https://github.com/coreos/etcd), that's why I used that, but open to change it to `configuration`. What do you think?\r\n\r\nI wasn't sure how to put what I meant with register/deregister, I think we don't need that part, removing.\r\n\r\nagain `master` was what is was called on a page on the CoreOS website, but can change. I actually also think `leader` is better here as we're directly talking about the `fleet` stuff. Generally though you could use it for any kind of `master` 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