k8s-1

What types of applications can Kubernetes run?

• Anything that can run on Linux

• backend APIs

• Batch Jobs

• Web frontend

Which Linux technologies should be utilized to run a production-grade containerization system?

• Control daemons running with elevated privileges

• Namespaces

• Additional security mechanism (SELinux, seccomp, etc.)

• cgroups

Which kubectl command will switch the current context to a different one?

• kubectl config get-contexts

• kubectl config set-context mycontext

• kubectl config use-context mycontext

• kubectl set-context mycontext

How is authentication to Kubernetes cluster performed at Linker Cloud?

• With OpenID Connect token, obtained from Keycloak

• With a dedicated user name and password

• With a X.509 certificate

• With a bearer token, obtained via AWS

Can Kubernetes build a container image?

• Yes, with built-in functionality

• No

• Yes, with 3rd-party tools or a custom solution

What is the purpose of YAML representation of a Kubernetes resource?

• kubectl needs to parse it, and translate to use methods and attributes used by Kubernetes API

• kubectl converts YAML into JSON and sends as-is to appropriate Kubernetes API

• kubectl uploads YAML as a file to Kubernetes master, where it is parsed

A Pod is:

• a concept specific to podman

• made of one or more containers

• made of exactly one container

• smallest deployable computing unit in Kubernetes

A ConfigMap resource can be consumed by the application running in a Pod, in the following way:

• Environment variables created from ConfigMap keys

• By issuing a request to Kubernetes API within the cluster

• With files stored in the container image during image build

• With files created in configuration volume, from ConfigMap keys

A command can be executed in a running Kubernetes Pod, using:

• kubectl exec podname -- command

• kubectl exec podname -c command

• docker exec command

• kubectl run podname command

I have Kubernetes problems and I am strongly convinced these problems are not between keyboard and chair. Where should I ask questions?

• Direct message to rkujawa

• On #linker-general-internal channel

• Direct message to dkierdal

• On #kubernetes channel