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Fixed #125
Also added questions on Helm
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abregman committed Jan 24, 2021
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40 changes: 34 additions & 6 deletions README.md
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:information_source:  This repo contains questions and exercises on various technical topics, sometimes related to DevOps and SRE :)

:bar_chart:  There are currently **1500** questions
:bar_chart:  There are currently **1504** questions

:books:  To learn more about DevOps and SRE, check the resources in [devops-resources](https://github.com/bregman-arie/devops-resources) repository

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#### Kubernetes Storage

<details>
<summary>True or False? Kubernetes provides data persistence out of the box, so when you restart a pod, data is saved</summary><br><b>

False
</b></details>

<details>
<summary>Explain "Persistent Volumes". Why do we need it?</summary><br><b>

Persistent Volumes allow us to save data so basically they provide storage that doesn't depend on the pod lifecycle.
</b></details>

<details>
<summary>True or False? Persistent Volume must be available to all nodes because the pod can restart on any of them</summary><br><b>

True
</b></details>

<details>
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`helm search hub [some_keyword]`
</b></details>

<details>
<summary>Is it possible to override values in values.yaml file when installing a chart?</summary><br><b>
Yes. You can pass another values file:
`helm install --values=override-values.yaml [CHART_NAME]`

Or directly on the command line: `helm install --set some_key=some_value`
</b></details>

<details>
<summary>How Helm supports release management?</summary><br><b>

Helm allows you to upgrade, remove and rollback to previous versions of charts. In version 2 of Helm it was with what is known as "Tiller". In version 3, it was removed due to security concerns.
</b></details>

#### Submariner

<details>
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* Push Gateway
* Alert Manager</summary><br><b>

Prometheus server responsible for scraping the storing the data<br>
Prometheus server is responsible for scraping and storing the data<br>
Push gateway is used for short-lived jobs<br>
Alert manager is responsible for alerts ;)
</b></details>
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## Git

<details>
<summary>How do you know if directory you are in is a git repository?</summary><br><b>
<summary>How do you know if a certain directory is a git repository?</summary><br><b>

You can check if there is a ".git" directory.
You can check if there is a ".git" directory inside it.
</b></details>

<details>
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<details>
<summary>You would like to move forth commit to the top. How would you achieve that?</summary><br><b>

Using <code>git rebase></code> command
Using the `git rebase` command
</b></details>

<details>
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<details>
<summary>How can you see which changes have done before committing them?</summary><br><b>

<code>git diff</code>
`git diff```
</b></details>

<details>
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2 changes: 1 addition & 1 deletion credits.md
Expand Up @@ -9,7 +9,7 @@ Puppet logo created by <a href="https://puppet.com">Puppet®</a><br>
Bash logo created by Prospect One<br>
OpenStack logo created by and a trademark of The <a href="https://www.openstack.org">OpenStack Foundation®</a><br>
Linux, Kubernetes and Prometheus logos are trademarks of The Linux Foundation®<br>
Mongo logo is a trademark of <a href="www.mongodb.com">Mongo®</a><br>
Mongo logo is a trademark of <a href="http://www.mongodb.com">Mongo®</a><br>
Distributed logo by <a href="https://www.iconfinder.com/Flatart">Flatart</a><br>
Challenge icon by Elizabeth Arostegui in Technology Mix
"Question you ask" (man raising hand) and "Database" icons by [Webalys](https://www.iconfinder.com/webalys)
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