Copy of #100DaysOfKubernetes
Where does the orchestration come in?
There are several other API objects which can be used to deloy pods. A DaemonSet will ensure that a single pod is deployed on every node. These are often used for logging and metrics pods. A StatefulSet can be used to deploy pods in a particular order, such that following pods are only deployed if previous pods report a ready status.
API objects can be used to know
What containerized applications are running (and on which nodes)
The resources available to those applications
The policies around how those applications behave, such as restart policies, upgrades, and fault-tolerance
There are several add-ons which have become essential to a typical production cluster, such as DNS services. Others are third-party solutions where Kubernetes has not yet developed a local component, such as cluster-level logging and resource monitoring.