Name: Containerization and Orchestration of CS50 IDE - Cloud Native Revolution 2019
Uploaded: 2020-03-28T10:51:09.000Z
Duration: 22 min 13 s
Description: Thousands of YouTube videos with English-Chinese subtitles! Now you can learn to understand native speakers, expand your vocabulary, and improve your pronunciation...

We are having Dr David Milan and Kareem Zidane from Harvard University.

Milan is a Gordon McKay professor of the practice of computer science at Harvard University.

He teaches computer Science 50 otherwise known as CS 50 which is Harvard University's largest course, One of Yo University's largest courses and Ed X's largest massive own line are massive, open online course.

He also teaches that harvest Harvard Business School, Harvard Law School, Harvard Extension School and Harvard Summer School.

Karim's a Dane, is a software developer, system administrator and teaching fellow four CS 50 at Harvard University.

He is a self taught, a self taught programmer from Egypt who discovered computer science, including CS 50 itself online.

He is the chief architect of the CS 50 i.

When asked, what food would they never get tired of eating?

Please join me in welcoming Dr David Milan.

Coming just minutes after a talk on whether we're alone in the universe.

Our talk is I'd actually little more down to earth.

We're here to talk about integrated development environment, and my name is David Malin.

I teach an introductory course at Harvard called CS 50 Computer Science 50 which is our introduction to computer science for majors and non majors.

And I'm here with a colleague Karim sedan, who was actually a student of ours online years ago.

But it's since joined us in Cambridge, Massachusetts, to work on the very set of problems that we're here to talk a little bit about.

So I thought I'd t up what it is we do and what problems it is that we aspire to solve.

And Kareem walk us through some of these solutions to that ultimately, so the start of the semester.

We have some 800 students in this undergraduate class.

It happens to be Harvard's largest class, predominantly non majors.

But computer science is now the second largest major at Harvard, and so it's a pretty large demographic of students.

We similarly make freely available to anyone online, not only as a massive open online course via FedEx.

It that's your l, including all of the materials, all of software, all of the sample solutions.

Where is available is open courseware in the spirit of M.

Is tradition such that anyone on the Internet can download an access any of these materials att all beyond, Though being just available to students online, we focused really on the community aspect and building up local support structure, so to speak around the world, each red dot above represents high school that happens to have adapted our adopted.

This course is 50 in some form, and each of the blue dots represents a university where some faculty or student group or non profit in the area has similarly done the same.

To provide a localized in person support structure for students following along and teaching themselves computer science.

The scale then that we operate on is fairly large, not only on campus but off on campus.

We might have 1000 students among the undergraduate students, Harvard's Extension School and also down the road at Yale University, where we have a cohort of students as well and then online.

Over the past several years have we had some one million registrants in the course, not all of whom engaged at any given moment in time?

In fact, on any given day might we have several 1000 students using the courses infrastructure, cloud based infrastructure that will soon address Andi?

Over the course of a month, we might have some 30,000 active participants banging on the servers and the virtual machines.

And now the containers that we use to support those students work to give you a sense of where it all began, though it all began much more modestly, much more locally in Cambridge, Massachusetts.

So back in the day late eighties early nineties, we just had a non clamp on campus cluster of servers that students each had home directories on user names and if it's mounted home directories in which they could do their work, our class is predominately software focused.

We tend to use tools like G, C, C and G, D B and the like it familiar to focus on sea and then, later in the semester to be transition to other languages like Python.

So it sufficed early on and to this day to really just give students a terminal window.

And so back in the day, they all tell, netted two until the world figured out Sshh, which point the SS H to centralize servers where they would do all of their work and submit all of their work.

And this was implemented on campus with a bunch of UNIX servers in front of which was a load balancer of some sort.

And then students were round robin distributed among the load there.

The fact, though, that the university ran this meant that, frankly, the software was always several years out of date.

We, as an individual course, did not have administrative access or sudo access to any of the accounts.

It was hard, frankly, to support students optimally if we just didn't have the software and the access that we wanted to be able to answer questions, help them die, diagnose bugs and the like.

And so cloud computing caught our eye pretty early on when AWS was just gaining steam for us.

C to the elastic compute cloud and at the time there were terribly few.

You had to build yourself by wiring together some of the more primitive service's.

Pretty much re architect ing that same topology this time, though, in the cloud gaining for ourselves, sudo access and the ability to scale it up and down.

Depending on the day or the night of the week.

When a homework assignment was do, however, there was not without costs.

In fact, I think we appreciate it a little too long in the process that the wonderful thing Harvard was providing was system administrators who used to run all of this for us.

So all of a sudden, now it was us working not only 9 to 5 during business hours, but also 5 to 9 when the students were actually on these systems doing their work, particularly late into the night.

So not without some hidden human costs early on.

Also at the same time, because of the open courseware community, we had no ability to provide students online really, with their own Harvard University counts just by nature of not being able to scale and for reasons of privacy and security.

So they weren't able to tell another SS H to the same clusters on campus or off.

And so we eventually transition to a client side, virtual machine and appliance that students could download.

And so for several years we gave them virtual box.

Of'em were fusion or workstation with, like so they downloaded in environment onto their own Max or PC that they then did that all that same work it gave us.

Additionally, a nice graphical interface, which opened up new problems saying capabilities, since we were no longer restricted to just a command line environment.

But it, too, was not without its challenges.

Frankly, virtual box back in the day wasn't terribly reliable, Huh?

Was not uncommon for students at the end of the work.

I did the day in middle of a P set, close their laptop and boom virtual hard disk bricked because it wasn't on mounted correctly.

And so those kinds of headaches and windows and Mac OS particulars just got in the way of maintaining a common infrastructure for students in a way that just worked.

And so we transitioned ultimately to a cloud based idea in 2015.

And that's where we are now and where the story picks up where we went back into the cloud.

In this time, though focused more on software is a service using an open source tool called Cloud nine, formally implemented by a team at a start up.

Now part of Amazon Web service is and began to add some pedagogical motivated JavaScript base plug ins to this environment and ultimately to build out the back end that provided students with the same illusion that they had access to their own account or really their own service in the cloud.

For those unfamiliar, this is a screenshot of cloud nine or specifically see its fifties incarnation thereof with some pedagogical simplifications and you my modifications.

It provides students with a familiar tab based code editor like you would find on any modern system provides the most importantly with a terminal window, so they have full fledged access to the underlying system.

Ah, file browser A top left, but then also some or teacher friendly and programmer friendly features like the ability to chat in real time with someone with whom I met Pierre programming or a teacher who might want to help them remotely.

It provides them with an interactive graphical do bugger that provides them with the ability to step through their code line by line, the ability to roll back in time on a version control but this time graphically so students can see where they left off just minutes ago.

And ultimately, here's a screenshot of that same to bugger that allows them step step through stack frames and the like.

But Amazon eyes Cloud 92 out of the box connects on Lee by default to easy to servers, and it's designed to do this so that you start up your only see two server.

You run this Web based E Y, and from there, you get to do anything you want in it.

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Containerization and Orchestration of CS50 IDE - Cloud Native Revolution 2019

ultimately

entire

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massive