Add a couple of questions
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README.md
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README.md
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:information_source: This repository contains interview questions on various DevOps related topics
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:bar_chart: There are currently **416** questions
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:bar_chart: There are currently **434** questions
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:warning: You don't need to know how to answer all the questions in this repo. DevOps is not about knowing all :)
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<td align="center"><a href="#puppet"><img src="images/puppet.png" width="75px;" height="75px;" alt="puppet"/><br /><b>Puppet</b></a><br /><sub><a href="#puppet-beginner">Beginner :baby:</a></sub><br><sub><a href="#puppet-advanced">Advanced :star:</a></sub></td>
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<td align="center"><a href="#openshift"><img src="images/openshift.png" width="75px;" height="75px;" alt="OpenShift"/><br /><b>OpenShift</b></a><br /><sub><a href="#openshift-beginner">Beginner :baby:</a></sub><br><sub></td>
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</tr>
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<tr>
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<td align="center"><a href="#scenarios"><img src="images/scenarios.png" width="110px;" height="75px;" alt="Scenarios"/><br /><b>Scenarios</b></a></td>
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</tr>
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</table>
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</center>
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<!-- markdownlint-enable -->
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@ -65,6 +68,27 @@
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<details>
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<summary>What is DevOps? What DevOps helps us to achieve?</summary><br><b>
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There are many good answers to this question. I like Amazon's description of DevOps:
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"DevOps is the combination of cultural philosophies, practices, and tools that increases an organization’s ability to deliver applications and services at high velocity: evolving and improving products at a faster pace than organizations using traditional software development and infrastructure management processes. This speed enables organizations to better serve their customers and compete more effectively in the market."
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You can find more details here: https://aws.amazon.com/devops/what-is-devops
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</b></details>
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<details>
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<summary>What are the benefits of DevOps? What it can help us to achieve?</summary><br><b>
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You should mention some or all of the following:
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* Collaboration
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* Improved delivery
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* Security
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* Speed
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* Scale
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* Reliability
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Detailed answer can be found here: https://aws.amazon.com/devops/what-is-devops
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</b></details>
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<details>
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@ -485,7 +509,15 @@ Stop the instance, the type of the instance to match the desired RAM and start t
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</b></details>
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<details>
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<summary>What is an IP address? What is a subnet?</summary><br><b>
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<summary>What is an IP address?</summary><br><b>
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</b></details>
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<details>
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<summary>Explain subnet mask and given an example</summary><br><b>
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</b></details>
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<details>
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<summary>What is a private IP address? What do we need it for?</summary><br><b>
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</b></details>
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<details>
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@ -500,6 +532,18 @@ Data link: provides a link between two directly connected nodes (MAC is here)
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Physical: the electrical and physical spec the data connection (Bits are here)
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</b></details>
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<details>
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<summary>For each of the following determine to which OSI layer it belongs:
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* Error correction
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* Packets routing
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* Cables and electrical signals
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* MAC address
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* IP address
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* Sessions between applications
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* 3 way handshake</summary><br><b>
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</b></details>
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<details>
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<summary>What delivery schemes are you familiar with?</summary><br><b>
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@ -539,12 +583,20 @@ CSMA/CD algorithm:
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<summary>What is NAT?</summary><br><b>
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</b></details>
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<details>
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<summary>What is a proxy? How it works? What do we need it for?</summary><br><b>
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</b></details>
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<details>
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<summary>What is the difference between TCP and UDP?</summary><br><b>
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TCP establishes a connection between the client and the server to guarantee the order of the packages, on the other hand, UDP does not establish a connection between client and server and doesn't handle package order. This makes UDP more lightweight than TCP and a perfect candidate for streaming services.
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</b></details>
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<details>
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<summary>Explain "default gateway"</summary><br><b>
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</b></details>
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<details>
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<summary>How TCP works? What is the 3 way handshake?</summary><br><b>
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</b></details>
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@ -713,6 +765,10 @@ Using the `chmod` command.
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<summary>Explain what is setgid, setuid and sticky bit</summary><br><b>
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</b></details>
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<details>
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<summary>You try to delete a file but it fails. Name at least three different reason as to why it could happen</summary><br><b>
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</b></details>
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<details>
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<summary>How to add a new user to the system without providing him the ability to log-in into the system?</summary><br><b>
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@ -823,7 +879,7 @@ I consider this as a good blog post to read more about it: https://shapeshed.com
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</b></details>
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<details>
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<summary>What is the different between a soft link and hard link?</summary><br><b>
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<summary>What is the difference between a soft link and hard link?</summary><br><b>
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hard link is the same file, using the same inode.
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soft link is a shortcut to another file, using a different inode.
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@ -832,6 +888,10 @@ soft links can be created between different file systems while
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hard link can be created only within the same file system.
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</b></details>
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<details>
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<summary>What happens when you delete the original file in case of soft link and hard link?</summary><br><b>
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</b></details>
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<details>
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<summary>What is a swap partition? What is it used for?</summary><br><b>
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</b></details>
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@ -1035,6 +1095,19 @@ related to the file like its size, owner, permissions, etc.
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<summary>How can you turn your Linux server into a router?</summary><br><b>
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</b></details>
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<details>
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<summary>What is a virtual IP? In what situation would you use it?</summary><br><b>
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</b></details>
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<details>
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<summary>Which port is used in each of the following protocols?:
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* SSH
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* HTTP
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* DNS
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* HTTPS</summary><br><b>
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</b></details>
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<details>
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<summary>What is the routing table? How do you view it?</summary><br><b>
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</b></details>
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@ -2829,6 +2902,10 @@ the pseudo table to retrieve the sum of the prices spent by each customer, then
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<a name="azure-beginner"></a>
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#### :baby: Beginner
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<details>
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<summary>Explain Azure's architecture</summary><br><b>
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</b></details>
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<details>
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<summary>Explain availability sets and availability zones</summary><br><b>
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</b></details>
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@ -2846,6 +2923,10 @@ the pseudo table to retrieve the sum of the prices spent by each customer, then
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<a name="gcp-beginner"></a>
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#### :baby: Beginner
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<details>
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<summary>Explain GCP's architecture</summary><br><b>
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</b></details>
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<details>
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<summary>What are the main components and services of GCP?</summary><br><b>
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</b></details>
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</b></details>
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<details>
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<summary>What is Privilege Restriction?</summary><br><b>
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<summary>Explain "Privilege Restriction"</summary><br><b>
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</b></details>
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<details>
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<summary>What is DDoS attach? How do you deal with it?</summary><br><b>
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</b></details>
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<details>
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<summary>Explain Man-in-the-middle attach</summary><br><b>
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</b></details>
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<details>
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<summary>Explain CVE and CVSS</summary><br><b>
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</b></details>
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<details>
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<summary>Describe how do you secure public repositories</summary>
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</b></details>
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##### Containers
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<details>
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<summary>What security measures are you taking when dealing with containers?</summary><br><b>
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</b></details>
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<details>
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<summary>Explain what is Docker Bench</summary><br><b>
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</b></details>
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## Puppet
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## Ansible, Minikube and Docker
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* Write a simple program in any language you want that outputs "I'm on <HOSTNAME>"
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* Write a simple program in any language you want that outputs "I'm on %HOSTNAME%" (HOSTNAME should be the actual host name on which the app is running)
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* Write a Dockerfile which will run your app
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* Create the YAML files required for deploying the pods
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* Write and run an Ansible playbook which will install Docker, Minikube and kubectl and then create a deployment in minikube with your app running.
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