blopezpi / the-real-sre-challenge

This challenge was designed to look for your SRE skills.

The real SRE challenge

Hey! You're here because you want to show your worth as a Site Reailibily Engineer (a.k.a SRE). You know what? I'm really happy you're here. If you want more information about what is a SRE, we recommend read the books published by Google to increase your knowledge.

Let's go!

The challenge starts here

You have to fork this repository to complete the following challenges in your own github account. Feel free to solve the challenge you want. If you have any doubt, don't hesitate to open an issue to ask any question about any challenge.

Exists 6 basic challenges and 3 extras challenge. So, the basic we recommend to finish them and the extra only if you want demostrate more.

• Every challenge must have the SOLUTION.md in their directory.
• The content of SOLUTION.md is how-to obtain the result, executed commands and short explanation (if necessary).

And... this is all. The first step is clone the repository and read quietly.

Challenge 1. Basic search

NOTE: Go challenge-1 directory.

We've found a sample.log file with 3360 lines but we need some info. Can you help us?

• Count all lines with 500 HTTP code.
• Count all GET requests from yoko to /rrhh location and was OK (200).
• How many requests go to /?
• Count all lines without 5XX HTTP code.
• Replace all 503 HTTP code by 500, how many requests have 500 HTTP code?

Challenge 2. Overview system

NOTE: Create challenge-2 directory.

We would like get some info. about the server. Can you help us? Someone told us about sysstat package.

• Check the distribution.
• Check CPU usage.
• Check RAM usage. Can you explain the difference of free, used, shared and available stats?
• List block devices and file system disk.
• Obtain TCP and UDP listen ports.
• Get only PID top 10 process with more CPU usage.
• List all pid which open/used /dev/null.

Challenge 3. Scripting

NOTE: Create challenge-3 directory.

We would like use the challenge-2 commands with a simple menu (develop with bash script). In my mind the -h (help) print this:

Usage: myscript [options..]
Myscript description

Myscript options:
  -d, --disk       check disk stats
  -c, --cpu        check cpu stats
  -p, --ports      check listen ports
  -r, --ram        check ram stats
  -o, --overview   top 10 process with more CPU usage.

Challenge 4. Is running?

NOTE: Go challenge-4 directory.

We've the server.py code and we want containerized (with docker) this HTTP server. Can you give us the Dockerfile? Ah! Can you check everything is running? Our technical team told us we need make a request with Challenge: intelygenz.com header. Can you give us the result that server print?

Challenge 5. What's wrong?

NOTE: Go challenge-5 directory.

Oh, no! I don't know what happen on this binary! Can you help me? When I executed the binary told me always Ooooh, what's wrong? :(. How to fix it? We expected Congrats! :) message.

Challenge 6. Build with Ansible

NOTE: Go challenge-6 directory.

NOTE 2: We recommend use a Virtual Machine with Debian (or you favorite flavour).

You find a playbook but is incomplete. Can you develop Ansible tasks to deploy the challenge-4?

• Add the server on the inventory.
• Install docker.
• build the image from Dockerfile (challenge-4).
• Deploy the image on the server.
• Check if HTTP server is running and response properly.
• Save the output of the ansible-playbook execution in ansible.log file and upload.
• Group tasks with tags.

We've some modules to solve it:

• build Docker image
• deploy container
• check server via HTTP

Extra Challenges

Extra Challenge 1. Build with Terraform

NOTE: Create challenge-extra-1 directory.

• Use kreuzwerker/docker and hashicorp/http providers to replicate challenge-6 with Terraform.
• Upload all files when you finished the task.

Extra Challenge 2. Kubernetes

NOTE: Go challenge-extra-2 directory.

Prepare environment:

• Install microk8s or minikube.
• Execute kubectl apply -f manifests/.

Get info.:

• Get all namespaces.
• Get all pods from all namespaces.
• Get all resources from all namespaces.
• Get all services from namespace intelygenz.
• Get all deployments from tools.
• Get image from nginx deployment on intelygenz namespace.
• Create a port-forward to access nginx pod on intelygenz namespace.

Extra Challenge 3. Test Ansible

NOTE: Create challenge-extra-3 directory.

• Use molecule to test challenge-6 with your prefered (and compatible) provider and driver.
• Upload all files when you finished the task.