700 questions :D
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abregman
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README.md
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README.md
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:information_source: This repository contains questions on various DevOps and SRE related topics
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:bar_chart: There are currently **690** questions
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:bar_chart: There are currently **700** questions
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:books: To learn more about DevOps check the resources in [DevOpsBit.com](https://devopsbit.com)
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@ -24,12 +24,12 @@
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<tr>
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<td align="center"><a href="#devops"><img src="images/devops.png" width="70px;" height="75px;" alt="DevOps" /><br /><b>DevOps</b></a><br /><sub><a href="#devops-beginner">Beginner :baby:</a></sub><br><sub><a href="#devops-advanced">Advanced :star:</a></sub></td>
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<td align="center"><a href="#jenkins"><img src="images/jenkins.png" width="80px;" height="85px;" alt="Jenkins"/><br /><b>Jenkins</b></a><br /><sub><a href="#jenkins-beginner">Beginner :baby:</a></sub><br><sub><a href="#jenkins-advanced">Advanced :star:</a></sub></td>
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<td align="center"><a href="#git"><img src="images/git.png" width="110px;" height="75px;" alt="Git"/><br /><b>Git</b></a><br /><sub><a href="#git-beginner">Beginner :baby:</a></sub><br><sub><a href="#git-advanced">Advanced :star:</a></sub></td>
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<td align="center"><a href="#git"><img src="images/git.png" width="80px;" height="75px;" alt="Git"/><br /><b>Git</b></a><br /><sub><a href="#git-beginner">Beginner :baby:</a></sub><br><sub><a href="#git-advanced">Advanced :star:</a></sub></td>
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<td align="center"><a href="#ansible"><img src="images/ansible.png" width="65px;" height="75px;" alt="Ansible"/><br /><b>Ansible</b></a><br /><sub><a href="#ansible-beginner">Beginner :baby:</a></sub><br><sub><a href="#ansible-advanced">Advanced :star:</a></sub></td>
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<td align="center"><a href="#Network"><img src="images/network.png" width="80x;" height="75px;" alt="Network"/><br /><b>Network</b></a><br /><sub><a href="#network-beginner">Beginner :baby:</a></sub><br><sub><a href="#network-advanced">Advanced :star:</a></sub></td>
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<td align="center"><a href="#linux"><img src="images/linux.png" width="75x;" height="75px;" alt="Linux"/><br /><b>Linux</b></a><br /><sub><a href="#linux-beginner">Beginner :baby:</a></sub><br><sub><a href="#linux-advanced">Advanced :star:</a></sub></td>
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<td align="center"><a href="#terraform"><img src="images/terraform.png" width="75px;" height="75px;" alt="Terraform"/><br /><b>Terraform</b></a><br /><sub><a href="#terraform-beginner">Beginner :baby:</a></sub><br><sub><a href="#terraform-advanced">Advanced :star:</a></sub></td>
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<td align="center"><a href="#docker"><img src="images/docker.png" width="75px;" height="75px;" alt="Docker"/><br /><b>Docker</b></a><br /><sub><a href="#docker-beginner">Beginner :baby:</a></sub><br><sub><a href="#docker-advanced">Advanced :star:</a></sub></td>
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<td align="center"><a href="#terraform"><img src="images/terraform.png" width="70px;" height="75px;" alt="Terraform"/><br /><b>Terraform</b></a><br /><sub><a href="#terraform-beginner">Beginner :baby:</a></sub><br><sub><a href="#terraform-advanced">Advanced :star:</a></sub></td>
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<td align="center"><a href="#docker"><img src="images/docker.png" width="70px;" height="75px;" alt="Docker"/><br /><b>Docker</b></a><br /><sub><a href="#docker-beginner">Beginner :baby:</a></sub><br><sub><a href="#docker-advanced">Advanced :star:</a></sub></td>
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</tr>
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<tr>
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<td align="center"><a href="#coding"><img src="images/coding.png" width="75px;" height="75px;" alt="coding"/><br /><b>Coding</b></a><br /><sub><a href="#coding-beginner">Beginner :baby:</a></sub><br><sub><a href="#coding-advanced">Advanced :star:</a></sub></td>
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<tr>
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<td align="center"><a href="#monitoring"><img src="images/monitoring.png" width="75px;" height="75px;" alt="Monitoring"/><br /><b>Monitoring</b></a><br /><sub><a href="#monitoring-beginner">Beginner :baby:</a></sub><br><sub></td>
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<td align="center"><a href="#elastic"><img src="images/elastic.png" width="110px;" height="75px;" alt="Elastic"/><br /><b>Elastic</b></a><br /><sub><a href="#elastic-beginner">Beginner :baby:</a></sub><br><sub></td>
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<td align="center"><a href="#dns"><b>DNS</b></a><br /><sub><a href="#dns-beginner">Beginner :baby:</a></sub><br><sub></td>
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<td align="center"><a href="#virtualization"><b>Virtualization</b></a><br /><sub><a href="#virtualization-beginner">Beginner :baby:</a></sub><br><sub></td>
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<td align="center"><a href="#dns"><b>DNS</b></a><br /><sub><a href="#dns-beginner">Beginner :baby:</a></sub><br><sub></td>
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<td align="center"><a href="#operating-system"><b>Operating System</b></a><br /><sub><a href="#operating-system-beginner">Beginner :baby:</a></sub><br><sub></td>
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<td align="center"><a href="#distributed"><img src="images/distributed.png" width="110px;" height="75px;" alt="Distributed"/><br /><b>Distributed</b></a></td>
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<td align="center"><a href="#general"><b>General</b></a><br /><sub><a href="#general-beginner">Beginner :baby:</a></sub><br><sub></td>
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@ -260,6 +260,10 @@ One can argue whether it's per company definition or a global one but at least a
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<summary>What Continuous Integration solution are you using/prefer and why?</summary><br><b>
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</b></details>
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<details>
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<summary>What deployment strategies are you familiar with or have used?</summary><br><b>
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</b></details>
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<a name="devops-advanced"></a>
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#### :star: Advanced
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@ -444,7 +448,7 @@ In On-Premise solution, it's quite the opposite. You need to take care of hardwa
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<a name="aws-beginner"></a>
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#### :baby: Beginner
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##### Global Infrastructure
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#### Global Infrastructure
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<details>
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<summary>Explain the following
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@ -469,7 +473,7 @@ Edge locations are basically content delivery network which caches data and insu
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True
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</b></details>
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##### S3
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#### S3
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<details>
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<summary>Explain what is S3 and what is it used for</summary><br>
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@ -510,7 +514,7 @@ True
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<summary>What is a storage class? What storage classes are you familiar with?</summary><br><b>
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</b></details>
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##### EC2
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#### EC2
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<details>
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<summary>What is EC2? What is it used for?</summary><br><b>
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@ -653,11 +657,15 @@ True
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<summary>What is VPC?</summary><br><b>
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</b></details>
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<details>
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<summary>What is an Elastic IP address?</summary><br><b>
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</b></details>
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<details>
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<summary>Explain Security Groups and Network ACLs</summary><br><b>
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</b></details>
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#### Identify the service
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#### Identify the service or tool
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<details>
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<summary>What would you use for easily creating similar AWS environments/resources for different customers?</summary><br><b>
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@ -678,12 +686,18 @@ Lightsail
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</b></details>
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<details>
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<summary>Which tool would you use for choosing between Reserved instances or On-Demand instances??</summary><br><b>
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<summary>Which tool would you use for choosing between Reserved instances or On-Demand instances?</summary><br><b>
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Cost Explorer
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</b></details>
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#### Misc
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<details>
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<summary>What would you use to check how many unassociated Elastic IP address you have?</summary><br><b>
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Trusted Advisor
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</b></details>
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#### AWS Misc
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<details>
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<summary>Explain what are the following services and give an use case example for each one them:
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@ -693,6 +707,10 @@ Cost Explorer
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* CloudSearch</summary><br><b>
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</b></details>
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<details>
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<summary>Explain what is AWS Lambda</summary><br><b>
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</b></details>
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## Network
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<a name="network-beginner"></a>
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<summary>What is TCP? How it works? What is the 3 way handshake?</summary><br><b>
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</b></details>
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<details>
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<summary>How does SSL handshake work?</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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@ -1315,13 +1337,7 @@ True
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* /usr/local
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</b></details>
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##### Processes
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<details>
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<summary>Can you explain what is a process?</summary><br><b>
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A process is a running program. A program is one or more instructions and the program (or process) is executed by the operating system.
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</b></details>
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#### Processes
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<details>
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<summary>How to run a process in the background and why to do that in the first place?</summary><br><b>
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You can also try closing/terminating the parent process. This will make the zombie process a child of init (1) which does periodic cleanups and will at some point clean up the zombie process.
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</b></details>
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<details>
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<summary>How to find all the
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* Processes executed/owned by a certain user
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* Process which are Java processes
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* Zombie Processes
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</summary><br><b>
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If you mention at any point ps command with arugments, be familiar with what these arguments does exactly.
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</b></details>
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<details>
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<summary>What is the init process?</summary><br><b>
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</b></details>
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@ -1582,6 +1609,10 @@ You can specify one or more of the following:
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##### Applications and Services
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<details>
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<summary>What can you find in /etc/services?</summary><br><b>
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</b></details>
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<details>
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<summary>How to make sure a Service starts automatically after a reboot or crash?</summary><br><b>
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@ -1590,18 +1621,6 @@ Depends on the init system.
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Systemd: <code> systemctl enable [service_name] </code>
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System V: <code> update-rc.d [service_name] </code> and add this line <code> id:5678:respawn:/bin/sh /path/to/app </code> to /etc/inittab
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Upstart: add Upstart init script at /etc/init/service.conf
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</b></details>
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<details>
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<summary>What is a load balancer?</summary><br><b>
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</b></details>
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<details>
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<summary>What load balancer algorithms are you familiar with?</summary><br><b>
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</b></details>
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<details>
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<summary>What can you find in /etc/services</summary><br><b>
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</b></details>
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<details>
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@ -1778,6 +1797,12 @@ There are many ways to answer that. For those who look for simplicity, the book
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* Stop - allow to stop a running process
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</b></details>
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<details>
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<summary>Can you explain what is a process?</summary><br><b>
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A process is a running program. A program is one or more instructions and the program (or process) is executed by the operating system.
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</b></details>
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<details>
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<summary>How a process is created?</summary><br><b>
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@ -2414,6 +2439,10 @@ In case we find out there was a temporary issue with the pod or the system, we c
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Setting the replicas to 0 will shut down the process. Now start it with `kubectl scale deployment [name] --replicas=1`
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</b></details>
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<details>
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<summary>Describe how roll-back works</summary><br><b>
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</b></details>
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## Coding
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<a name="coding-beginner"></a>
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@ -3770,7 +3799,11 @@ as key-value pair, document-oriented, etc.
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</b></details>
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<details>
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<summary>What is better?. Embedded documents or referenced?</summary><br><b>
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<summary>What is better? Embedded documents or referenced?</summary><br><b>
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</b></details>
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<details>
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<summary>Have you performed data retrieval optimizations in Mongo? If not, can you think about ways to optimize a slow data retrieval?</summary><br><b>
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</b></details>
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##### Queries
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@ -3917,6 +3950,10 @@ Using the keyword <code>read</code> so for example <code>read x</code> will wait
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<summary>Write a script to determine whether a host is up or down</summary><br><b>
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</b></details>
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<details>
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<summary>Write a script to remove all the empty files in a given directory (also nested directories)</summary><br><b>
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</b></details>
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<a name="shell-scripting-advanced"></a>
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#### Advanced
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@ -4839,6 +4876,20 @@ TODO: explain what is actually a Cookie
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<summary>When you publish a project, you usually publish it with a license. What types of licenses are you familiar with and which one do you prefer to use?</summary><br><b>
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</b></details>
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#### Load Balancers
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<details>
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<summary>What is a load balancer?</summary><br><b>
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</b></details>
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<details>
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<summary>What load balancer algorithms are you familiar with?</summary><br><b>
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</b></details>
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<details>
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<summary>What is an Application Load Balancer?</summary><br><b>
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</b></details>
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## HR
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Although the following questions are not DevOps related, they are still quite common and part of the DevOps interview process so it's better to prepare for them as well.
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