k8s

Question 1

How do we let other Pods and applications automatically discover each other?

Answer 1

k8s addresses this by grouping Pods in Services.

Question 2

Define a k8s Service

Answer 2

A k8s Service is an abstraction layer which defines a logical set of Pods and enables external traffic exposure, load balancing, and service discovery for those Pods.

Question 3

How do service match a set of Pods?

Answer 3

Using Label Selectors, a grouping primitive that allows for logical operation on Labels.

Question 4

What flag allows for creation of a Service while running a Deployment?

Answer 4

–expose

Question 5

What are Labels?

Answer 5

Labels are key/value pairs that are attached to objects, such as Pods and you an think of them as hashtags fm social media. They are used to organize related objects in a way meaningful to the users like: Production environment, Application version, Type of service/server.

Question 6

How is scaling accomplished?

Answer 6

By changing the number of replicas in a Deployment.

Question 7

What are rolling updates?

Answer 7

Rolling updates allows Deployments to occur with zero downtime by incrementally updating Pods instances with new ones.

Question 8

What actions are allowed with rolling updates?

Answer 8

• Promote an application from one env to another (via container image updates)
• Rollback to prev version
• Cont. Integration and Cont. Delivery of applications with zero downtime.