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Add a couple of Kubernetes questions

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abregman 2020-08-19 16:02:39 +03:00
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@ -2370,6 +2370,10 @@ tail -f <file_name>
<summary>What kind of information one can find in /proc?</summary><br><b>
</b></details>
<details>
<summary>Can you create files in /proc?</summary><br><b>
</b></details>
<details>
<summary>What is the difference between CPU load and utilization?</summary><br><b>
</b></details>
@ -2504,6 +2508,10 @@ Another way to ask this: what happens from the moment you turned on the server u
<summary>What is Secure Boot?</summary><br><b>
</b></details>
<details>
<summary>What can you find in /boot?</summary><br><b>
</b></details>
##### Linux Disk & Filesystem
<details>
@ -3450,6 +3458,12 @@ MemAvailable - The amount of available memory for new workloads (without pushing
<summary>Wildcards are implemented on user or kernel space?</summary><br><b>
</b></details>
<details>
<summary>If I plug a new device into a Linux machine, where on the system, a new device entry/file will be created?</summary><br><b>
/dev
</b></details>
<details>
<summary>Why there are different sections in man? What is the difference between the sections?</summary><br><b>
</b></details>
@ -4329,6 +4343,64 @@ False. A Kubernetes cluster consists of at least 1 master and 0 or more workers.
<summary>What is kubectl?</summary><br><b>
</b></details>
<details>
<summary>What are namespaces? Why would someone use namespaces?</summary><br><b>
</b></details>
<details>
<summary>True or False? When a namespace is deleted all resources in that namespace are not deleted but moved to another default namespace</summary><br><b>
False. When a namespace is deleted, the resources in that namespace are deleted as well.
</b></details>
<details>
<summary>What special namespaces are there?</summary><br><b>
* Default
* Kube-system
* Kube-public
</b></details>
<details>
<summary>What "Resources Quotas" are used for and how?</summary><br><b>
</b></details>
<details>
<summary>Explain ConfigMaps</summary><br><b>
Separate configuration from pods.
</b></details>
<details>
<summary>How to use ConfigMaps?</summary><br><b>
1. Create it (from key&value, a file or an env file)
2. Attach it. Mount a configmap as a volume
</b></details>
<details>
<summary>Explain "Horizontal Pod Autoscaler"</summary><br><b>
Scale the number of pods automatically on observed CPU utilization.
</b></details>
<details>
<summary>Explain the "Service" concept</summary><br><b>
"An abstract way to expose an application running on a set of Pods as a network service." - more [here](https://kubernetes.io/docs/concepts/services-networking/service)
</b></details>
<details>
<summary>What services types are there?</summary><br><b>
* ClusterIP
* NodePort
* LoadBalancer
* ExternalName
More on this topic [here](https://kubernetes.io/docs/concepts/services-networking/service/#publishing-services-service-types)
</b></details>
#### Basic Commands
<details>
@ -4349,6 +4421,24 @@ False. A Kubernetes cluster consists of at least 1 master and 0 or more workers.
`kubectl get namespaces`
</b></details>
<details>
<summary>How to view the current namespace?</code></summary><br><b>
kubectl config view | grep namespace
</b></details>
<details>
<summary>How to switch to another namespace?</code></summary><br><b>
kubectl config set-context --current --namespace=some-namespace
</b></details>
<details>
<summary>How to create a resource quota?</code></summary><br><b>
kubectl create quota some-quota --hard-cpu=2,pods=2
</b></details>
<details>
<summary>How to create a deployment?</code></summary><br><b>
@ -4378,10 +4468,46 @@ cat << EOF | kubectl create -f -
`kubectl delete pod pod_name`
</b></details>
<details>
<summary>How to execute the command "ls" in an existing pod?</code></summary><br><b>
kubectl exec some-pod -it -- ls
</b></details>
<details>
<summary>How to create a service that exposes a deployment?</code></summary><br><b>
kubectl expose deploy some-deployment --port=80 --target-port=8080
</b></details>
<details>
<summary>How to create a pod and a service with one command?</code></summary><br><b>
kubectl run nginx --image=nginx --restart=Never --port 80 --expose
</b></details>
<details>
<summary>Describe in detail what the following command does <code>kubectl create deployment kubernetes-httpd --image=httpd</code></summary><br><b>
</b></details>
<details>
<summary>How to scale a deployment to 8 replicas?</code></summary><br><b>
kubectl scale deploy some-deployment --replicas=8
</b></details>
<details>
<summary>How to get list of resources which are not in a namespace?</code></summary><br><b>
kubectl api-resources --namespaced=false
</b></details>
<details>
<summary>How to delete all pods whose status is not "Running"?</code></summary><br><b>
kubectl delete pods --field-selector=status.phase!='Running'
</b></details>
<details>
<summary>What is Minikube?</summary><br><b>
@ -4478,6 +4604,32 @@ It includes:
<summary>What is kubconfig? What do you use it for?</summary><br><b>
</b></details>
#### Kubernetes Secrets
<details>
<summary>Explain Kubernetes Secrets</summary><br><b>
Secrets let you store and manage sensitive information (passwords, ssh keys, etc.)
</b></details>
<details>
<summary>How to create a secret from a key and value?</summary><br><b>
kubectl create secret generic some-secret --from-literal=password='donttellmypassword'
</b></details>
<details>
<summary>How to create a secret from a file?</summary><br><b>
kubectl create secret generic some-secret --from-file=/some/file.txt
</b></details>
#### Kubernetes Misc
<details>
<summary>Explain what is CronJob and what is it used for</summary><br><b>
</b></details>
#### Submariner
<details>