What are containers ?

Need for orchestration

  • To run containers at scale
  • Optimally using system resources
  • Fault Tolerance
  • Autoscaling
  • ....

Container Orchestrator

  • Docker Swarm
  • Kubernetes
  • Mesos Marathon
  • Hashicorp Nomad
  • Amazon ECS
  • Fleet

Container Management Platforms

  • Tectonic
  • Rancher
  • Platform9

What is needed to do the Container Orchestration

Multiple Nodes to be part of a cluster

Unique ID/Token to bind all the nodes in a unique cluster

Container Engines

  • runC
  • Docker
  • Rkt

Single source of truth about configuration for nodes

  • Key-Value Store like etcd, consul

Network for containers of different nodes to talk to each other

  • Some form of Overlay network like VxLAN.
  • With possibility to plug different neworking solution like Calico.
  • TODO

One or more cluster master to manage the cluster and schedule the jobs/tasks

Scheduler to schedule the containers on nodes based on

  • Constraints, like run the container where SSD storage is available
  • Affinity

Service discovery within the cluster

  • Internal DNS server
  • Through environment variables
  • Load balancer, HA proxy

Access the services from external world

Access to external shared storage

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