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What to Expect and Tips

• 45-minute systems interview, focus on responding to real world problems with an unhealthy service, such as a web server or database. The interview will start off at a high level troubleshooting a likely scenario, dig deeper to find the cause and some possible solutions for it. The goal is to probe your knowledge of systems at scale and under load, so keep in mind the challenges of the Facebook environment.
• Focus on things such as tooling, memory management and unix process lifecycle.

Systems

More specifically, linux troubleshooting and debugging. Understanding things like memory, io, cpu, shell, memory etc. would be pretty helpful. Knowing how to actually write a unix shell would also be a good idea. What tools might you use to debug something? On another note, this interview will likely push your boundaries of what you know (and how to implement it).

Design/Architecture

Interview is all about taking an ambiguous question of how you might build a system and letting

Windows Containers notes

Published ports from Windows Containers aren't accessible on the container host (they are remotely). Use Container IP locally:
- docker inspect --format '{{ .NetworkSettings.Networks.nat.IPAddress }}' <container>
- Docs explaining this
- GH Issue tracking fixes
  - host's IP on host does work now in Creator's Update: "as well as having direct access to the container using the Host IP and exposed port." - https://blogs.technet.microsoft.com/virtualization/2017/04/13/whats-new-in-hyper-v-for-the-windows-10-creators-update/
  - localhost on host doesn't work yet
Troubleshooting & Logs - Docker docs: https://docs.docker.com/docker-for-windows/troubleshoot/#docker-knowledge-hub

using Ansible command line:

ansible-playbook --connection=local 127.0.0.1 playbook.yml

using inventory:

127.0.0.1 ansible_connection=local


	Questions are not from any actual exam!!!



	Q: Create a job that calculates pi to 2000 decimal points using the container with the image named perl
	and the following commands issued to the container: ["perl", "-Mbignum=bpi", "-wle", "print bpi(2000)"]
	Once the job has completed, check the logs to and export the result to pi-result.txt.

	Solution:

	type FilterOperator = 'AND' \| 'OR';
	type FiltersBy<T> = {
	[K in keyof T]?: (value: T[K]) => boolean;
	};

	/**
	* Factory function that creates a specialized function to filter
	* arrays, by validating all filters (AND operator),
	* or validating just one of the filters (OR operator).
	* @param operator Method to validate all filters: AND, OR

	class ParentComponent extends Component {
	constructor() {
	super();

	this.state = {
	data : [
	{id : 1, date : "2014-04-18", total : 121.0, status : "Shipped", name : "A", points: 5, percent : 50},
	{id : 2, date : "2014-04-21", total : 121.0, status : "Not Shipped", name : "B", points: 10, percent: 60},
	{id : 3, date : "2014-08-09", total : 121.0, status : "Not Shipped", name : "C", points: 15, percent: 70},
	{id : 4, date : "2014-04-24", total : 121.0, status : "Shipped", name : "D", points: 20, percent : 80},

	GRANT CREATE PROCEDURE TO [SqlUser];
	GRANT CREATE SERVICE TO [SqlUser];
	GRANT CREATE QUEUE TO [SqlUser];
	GRANT REFERENCES ON CONTRACT::[http://schemas.microsoft.com/SQL/Notifications/PostQueryNotification] TO [SqlUser];
	GRANT SUBSCRIBE QUERY NOTIFICATIONS TO [SqlUser];
	GRANT CONTROL ON SCHEMA::[dbo] TO [SqlUser];
	GRANT IMPERSONATE ON USER::DBO TO [SqlUser];

	-- This acually works
	-- https://social.msdn.microsoft.com/Forums/sqlserver/en-US/bd195da8-93b2-43c6-8f59-674f5fb9d618/cannot-find-the-queue-sqlquerynotificationserviceguid?forum=sqlservicebroker&prof=required

	# The command finds the most recent tag that is reachable from a commit.
	# If the tag points to the commit, then only the tag is shown.
	# Otherwise, it suffixes the tag name with the number of additional commits on top of the tagged object
	# and the abbreviated object name of the most recent commit.
	git describe

	# With --abbrev set to 0, the command can be used to find the closest tagname without any suffix:
	git describe --abbrev=0

	# other examples


	Invoke-WebRequest https://chocolatey.org/install.ps1 -UseBasicParsing \| Invoke-Expression;
	choco install vim

	package main

	import (
	"os"
	"os/exec"
	)

	func Start(args ...string) (p *os.Process, err error) {
	if args[0], err = exec.LookPath(args[0]); err == nil {
	var procAttr os.ProcAttr