Updating pods

Create, scale, update, recover, remove

ReplicaSets are only responsible for maintaining scale

Containerized services require complete lifecycle management

Update without service interruption

Responsible for updating applications with multiple replicas

RollingUpdate - Bring up new replicas as early as possible

Recreate - Start new replica after old replica was removed

Deployment internals

Deployment with ReplicaSet and pods

Deployments create a ReplicaSet

ReplicaSet maintains scale

ReplicaSet receives a random suffix

Pods receive a second random suffix

Deployment with old and new ReplicaSet

Deployments initiate an update by creating a new ReplicaSet

Updates work by scaling the new ReplicaSet up…

…and scaling the old ReplicaSet down