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Welcome back to backspace Academy in
this hands-on session I'm going to

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demonstrate how to use the Elastic
Beanstalk service to launch multiple

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environments and then use those multiple
environments in a Blue Green deployment

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to update our code, okay so starting off
in the Elastic Beanstalk management

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console this time I'm going to go to the
top right-hand side here and click on

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create new application, we'll just give
our application a name and click on

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create and so that will create a base
Elastic Beanstalk application and we can

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create environments that are
associated with that application

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we'll do that now, so we just go to
actions and create environment

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it's a web server environment and we'll leave
the environment name or we give it

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environment - one that's fine now
platform will be NodeJS and we're

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still again going to just use a sample
application and we're not going to

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configure any more options we just want
to launch this to a single instance

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to make it quite quick and easy, so we'll
create that environment, now while that

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environment is creating, we'll just jump
back into our blue-green application and

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I'm going to create another environment

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and we'll call this one environment - 2
and exactly the same as before

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a nodejs application and again we'll use
the sample application as before and we

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won't configure any more options and
we'll create an environment so we have

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two identical environments that will be
launched right now okay so after quite a

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few minutes we're going to have our
second environment up and running and if

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we click on the URL for that environment
we can see there we've got our AWS

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sample code for nodejs if we go back
into our application here our blue-green

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application we can see our two
environments, we click on our

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environment they've created we should be
seeing the same thing as well and that's

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fine so what we need to do now is go
back into our application and we look at

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application versions and so there we can
see is that the AWS sample application

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has been deployed to both of these
environments over here so environment 1

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environment two so what I'm going to
do is I'm going to download that so I

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just click on that and that'll take us
to the documentation and we can download

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the sample nodejs application from there
so I'll just click on that and download

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that now after I've downloaded and
extracted that zip file what I can do

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then is that I can look at modifying
this code so I'm just going to open up

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this index.html and just going to edit
it in notepad and it's going to scroll

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down to where it says the text column
and I'm just going to change the

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background color of that to it's
currently green I'm just going to change

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that to the blue and then save that and
then what I'm going to do is to zip that

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back up again so I just select
everything and see if that's so what I

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can do now so I can upload that updated
code to Elastic Beanstalk and we should

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have a blue application going there, so
I'm going to do that to the second

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environment, so I click on the
environments tab here and I'll select

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the second environment and I'm going to
upload and deploy our new code so I'll

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just click on that I'll choose that file

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and deploy that now after a certain
amount of time we're going to have that

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deployed on our second environment but
I'll give it a try now if I click on

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this endpoint we hopefully have a blue
yes we have a blue background there now

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so we changed our code we updated that
to the second environment and there we

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can see that it has come through fine if
we go back to our first environment that

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will still be green so just say that we
have our domain name that is pointed to

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this endpoint here and what we want to
do is that we want to we don't want to

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go into route 53 and change CNAMEs and
whatever and muck around like that we

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just want a very quick way to swap over
from our production environment to our

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development environment and then make
our development environment our

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production environment and so the
quickest way to do that is is with

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Elastic Beanstalk by doing a URL swap
and it'll swap the URL for this

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environment to the other environment so
then your domain that is being pointed

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to this URL will alter all of a sudden
be pointed to the other environment so

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let's give that a go. So what we do is we
go into actions and then we do swap

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environment URLs so that's going
to just swap this endpoint here for the

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endpoint of the other environment so we
slick their environment number two is

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that the environment that we want to
swap to and we click on swap and that

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will take a while to happen so after a
few minutes we're going to see that the

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the URLs for these two environments have
swapped so now our environment number

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one which was which had our green
background is now going to be pointing

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at at the URL that was previously for
environment number two we can see

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they're in - - now we go to the second
environment

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so remember this is the environment that
had the blue background it is now

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pointing or is our using the URL for the
first environment so if we've got our

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domain name pointed to this URL here now
that means that all of a sudden we're

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going to get the updated code and it's
going to happen instantaneously so we

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click on that we should get a blue
background and there we go so we have

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our environment one or that was our
originally our environment one URL is

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now pointing to the environment number
two which has our blue background so

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that's how a Bluegreen deployment works
and obviously our environment number one

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or our original environment will now
become our development environment and

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vice versa and so that's the way it
works so what we can do now is that we

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can clean this all up and again we go to
all applications and delete that

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application and delete so it'll delete
the application and it would delete

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those two environments as well so we get
his check on that we can see that the

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determinating those environments so that
brings us to the end of a pretty long

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hands-on session I don't expect you to
do this yourself it's not a lab because

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there's quite a little bit going on here
but it's good to understand exactly how

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a Bluegreen environment works I look
forward to seeing you in the next one