kubernetes

Terminology

• images: each container in a pod has an image. Currently only docker images are supported.
• pod: smallest deployable unit in a kube cluster. Consists of one or more images.
• replica sets (rs): multi-pod hypervisor, makes sure just the right amount of pods are running at any given time.
• deployments: sets of pods and replication controllers. Can be defined in a declarative format which describes the desired state
• services: persistant wrapper around a deployment; provides policies, virtual network addresses and labels
• node: single virtual or physical machine in a kube cluster
• cluster: group of nodes firewalled from the internet
• ingress resources: incoming traffic router

note: replication controllers (rc) used to be on this list, but is currently in the process of being superseded by rs. They should be similar in most regards.

SSL

• kelseyhightower/docker-kubernetes-tls-guide

Helm

helm(1) is to kube, what homebrew is to OS X.

Labels

Labels are added onto system objects to provide a multi-tiered structure. The following labels are enforced by helm(1), and are probably a good idea to rely on for non-helm kube structures too:

• group: same role. E.g. frontend, api, data
• provider: type of service provided. E.g. etcd, postgres, s3
• mode: operation mode of the service. E.g. standalone, clustered, discovery

Secrets

• user-guide/secrets
• https://github.com/kelseyhightower/kube-cert-manager

See Also

• bin/docker
• bin/gcloud
• bin/helm
• bin/kubectl
• https://kubernetesbootcamp.github.io/kubernetes-bootcamp/index.html