Red Hat OpenShift Developer Experience Office Hours, 27 Jul 2021

Previous Meeting Next Meeting

⏯

youtube image

►

From YouTube: Developer Experience Office Hours: Play with Spring on OpenShift

Description

Join OpenShift's Developer Experience experts for our regularly scheduled program filled with cloud native, Kubernetes, and OpenShift tips and tricks for developers.

Dewan Ahmed
https://twitter.com/DewanAhmed
https://www.linkedin.com/in/diahmed/

Eric Deandrea
https://www.linkedin.com/in/edeandrea/
https://twitter.com/edeandrea

Chris Short
https://www.linkedin.com/in/thechrisshort
https://twitter.com/ChrisShort

A

A

A

Good morning, good afternoon, good evening, wherever you're hanging from welcome to the developer experience office hour here on red hat live streaming, I am chris short a host and a show runner is the proper tv title. I've been told, uh I'm joined today by dewan ahmed and eric d'andrea. We're gonna have an awesome time with fruit. Apparently I I'm curious how this is going to go down. Please introduce yourself for the audience and and tell us what we're doing uh today.

B

Absolutely so my name is tiwan and I'm joining you from the beautiful new brunswick, which is in the eastern part of canada and we'll have some fun with fruits. What's your favorite fruit, chris, oh gosh, probably.

A

Oh man, that's tough, favorite fruit, probably oranges or blueberries. Like you know, I.

B

A

B

One of those increased high in vitamin c ones, then.

A

Yeah exactly right, like a lot of antioxidants, that kind of thing yeah.

B

Okay, going to going to eric then for his intro and favorite fruit.

C

My favorite so good, like chris, said good morning good afternoon good evening, wherever it is that you are I'm eric d'andrea like dewan, I'm not not in canada, but just below him, I'm in new the great state of new hampshire, granite state, um my favorite fruit, I like watermelon, especially this time of year. It's been.

B

Really really good.

C

B

We buy a lot of watermelon.

C

And it's been really really good this year.

B

C

uh Hard to find in the winter time, though,.

B

So so chris, do you know about this game where you chopped the fruits with the.

A

B

A

My my daughter played that quite a bit when it was popular yeah.

B

So someone told me eric: has a black belt.

C

Wow, I do have a black belt in martial arts wow, okay,.

B

C

I'm not just a tech geek. I can't.

B

Do stuff so we.

C

B

Ninja on the show.

A

Really does like, will he disappear and search in.

B

A

B

What kind of ninja, maybe if the demo doesn't work.

C

And then reappear.

D

Not on air my monitor.

C

Screen actually right now actually looks like I threw a chinese star at it. It's got a big spider web crack to it. I have no idea how it happened so.

A

C

A

Sorry to hear that.

C

And that was my monday morning.

A

And, of course, the kids didn't do it no like. This is why you only have one kid, because you know who always does it.

C

Well, you're you're, the big kid right. You got all the toys.

A

Right, like I mean, but to be honest with you most of the toys back there for my five-year-old's enjoyment, um you.

C

Just don't allow him anywhere near him, because.

A

He can totally grab whatever he wants off the shelf, but the problem is there's just a lot of crap in front of it.

A

So yeah, let's uh this is kind of the first uh developer experience officer we've had in a while, so you know apologize, you know, think life has happened it's summer. All these other things hell. We had storms rolling through here this weekend that left me without power for almost 48 hours. So you know, there's there's a lot going on and dawan is new to the team, and this is his first office hour of sorts, so at least live here. So thank you for joining us dwan. We really appreciate.

D

A

Yeah. Thank you. It's a pleasure.

C

We were chatting a little bit beforehand too, this this is kind of how we feel every day right.

A

Yes, yes, like especially today, after not like having access to anything like cell servers power internet. Anything yesterday like coming to work today, is like that right there yeah.

A

This is kind of how you want it to be like.

C

Right like yes, yes,.

A

Very nice, the world in harmony, kind of thing yeah, but instead it's just t-rex chasing.

B

Even if we don't know sometimes we're the t-rex and we're probably chasing someone else, we always think that we're the we're the person on that on the jeep right.

A

B

A

B

Okay, so what are we gonna talk about today? Well, you tell me something.

A

About something about.

B

Since, since we started the show with uh talk about fruits, so.

A

B

Maybe let's talk about fruits but uh how to build a fruit sap, maybe all right.

A

Let's so are you're you're doing this on your own, your own cluster? This is not a lab. Okay. Cool yeah just make it sure.

B

Yeah yeah yeah. So so let me start by sharing my screen and if you, if you can see my cool t-shirt, um that's the was the only java t-shirt. I could. I could find.

A

B

Wardrobe, so so we're gonna um we're gonna, build something uh with with spring framework and we will deploy the app on openshift.

B

But the good thing is what we're gonna show you today, you don't have to have access to an openshift cluster.

A

C

B

Me start by sharing my screen.

C

B

C

He's doing that is that he mentioned that's his only you know cool t-shirt, the only clean cool t-shirt.

A

Yes, to be clear right, like very cleanliness,.

B

Yes, yeah. Yes, yes, it's all like sprayed with uh hand sanitizers, so it's very clean and okay. So uh I think uh you can see the link on the screen learn.openshift.com, but uh my friend can also add this link on on the on the chat or comments or, however, you're.

A

B

Okay, okay, perfect, so learn.openshift.com! uh Actually let me go to the the main page, so you can also see how to navigate here and there's tons of scenarios for for different topics, but today's topic is developing with spring and spring book. So if you click that tab right here, you get six scenarios. Let's start with the first one, getting started with spring.

B

If you click on start the scenario uh this this uh setup runs on on on an openshift cluster which which is not your openshift cluster. This is provided for you as a sandbox, and I think, if I'm not mistaken, this is live for 60 minutes, but that should be more than enough to to complete this scenario.

B

If you somehow can't complete in time, you can refresh and you can have access to one more 60 minutes environment.

B

So once you, you start this scenario, some magic happens in the background, so basically it installs some required software, and once you see this ready you can you can start the scenario.

B

One of the cool thing with that is, you can type in the command, but you can also click and execute so, for example, if I do an ls-la.

A

B

Have anything here so first step is you have to clone the repository? So if I click that bam it clones the repository I see now I have a typical looking java project with palm.xml.

B

Let me clear up the screen, maybe put it on top nope, not not there yep like that, and if I do a tree I can see the the file structure, folder uh and all the file structure as well all right. So that's all nice and great. Let's look at the palm.xml.

B

So if we look at the palm.xml, you'll see a typical palm.xml with some to do so. These to-do's are stuff that we would like you to add yourself just to get used to the scenario and and do the scenario yourself, but majority of the stuff are already added for you. So this is more like a template and you add only the missing pieces again. All this thing you can type by hand, but because we don't want to do that, we can do just click and execute.

B

So if you come here this section, you see a nice copy to editor button uh watch the line watch line number 59. So this is the the dependency for springboard starter web, the web dependency. If I click here there, you have that dependency added. So that's the very first of the dependency just to even run the application. We add the other dependencies, but for the first step you don't need anything else. You can click maven spring boot run and it starts running. So this is a after maven downloads, the internet.

B

Yes, yes, that's what I wanted to say. If you actually the introduction we had, we could have the introduction right now uh how how's everything the state of world, whatever.

A

B

To chat probably now is the time when maven downloads, the internet,.

A

So, let's discuss how much of the internet is actually downloading. I mean.

A

Hundreds of megs.

C

Gigs, it's probably I mean, if you think about you, take a spring boot app and you package it into an uber jar. It's.

A

C

Megs between 60 and 100 meg, somewhere.

B

And yeah we were just overestimating uh the run time because I think it was like seven or eight seconds till we made the joke, see the jvm running for 1.3 seconds. So now you have the app running so where you can see the app where you have two options. First, is you can click right here.

A

B

Local web browser, not there, that's just an image, you have to click right here, local web browser and there you go, as you said, you can add or edit a fruit. You can also get the same link by clicking here. Use this link. It takes you that same app.

B

Now, of course, we don't have the methods to actually add or get at the foot. This is just in slash api fruits. uh The list doesn't have any fruit. So that's what we can expect. So I think eric was mentioning about watermelon.

A

See if we destroy it.

B

Say it's not gonna do anything because it doesn't have the methods to to add the fruit, but but don't you worry, we were gonna. Add that watermelon to the list. That's our promise, uh sometimes today, all right so so now that we have that, let's do a ctrl c exit that process and congratulations. We will keep congratulating you on every step because we are sure you can do it. Okay. So let's go to the next step.

B

Now we have to read content for from a database from this step and we add a jpa to this application. So you can see line 65. If I click copy to editor, you add the dependency and h2 is an in-memory database right or spring.

C

B

Is an in-memory database.

C

Yeah right right right so.

B

That's just a quick way of. If you want to test your application, you can use an in-memory database rather than maybe spinning up an actual like a full-fledged database. So we'll add again, that's if you scroll down on the palm you'll, see there's a section at h2 dependency line, 130 so copy to editor.

B

So now we're going to the meat of the of the project where you have to create an entity class. The first one is the fruit class fruit.java.

B

So if you see source main java.com, we don't have anything yet that's going to change. If I click copy editor, you can also like click here and then copy to edit it. It's gonna. Do the same thing. Copy to editor actually opens up the of the file on the on the ui and then copies the content. If you like vim, you can also do let's say like a vim, and then you can copy that file name and add that from the terminal. However, you want you.

B

Can you have lots of options so here we're adding that the fruit.java has some some? It has the constructor. It has some some uh methods, as you can see now, we need to create a repository class for uh for our content, like some something that will talk to the database um so like uh it's like it's a middle layer from from your from a source file and uh talking to your database.

C

Yeah one thing to kind of point out: there too demand is that entity class is just standard jpa, there's really nothing spring related, so any application that you were building in whatever framework that supported jpa would be the same rough, pretty much.

B

Yep yep and to do let me open up this link right here on a separate tab and we'll come back to that later, but that will be handy sometimes later so next we have to populate the database with some initial content, there's nothing uh in the database right now. So if we click here, just some sql commands sql sql one one of those two. um As you can see, we have three fruits in the list: cherry apple banana, no watermelon. Yet next, who doesn't like testing right?

B

We have to have a test class application, test.java copy to editor.

B

Do you see the application test.java source test java com yep? We see application test.java.

B

All right, so at this point we have the necessary structure to run, may even verify. We have some classes, some methods and we have a test class that tests those methods. So if we do maven verify.

C

No apparently maven didn't download the whole internet. The first time.

B

Yes, yes, so yeah. I wanted to ask.

A

B

Yeah, just part of it is that concept similar to um docker file, eric like where it caches all the previous stages. um Let's say if I do maven x command and then maven y command, the previous dependencies that may even download it it only downloads. The thing that it didn't download in the previous step is that right.

C

Yeah may even has a cache on the file system, but any protective patterns that's already downloaded. It won't re-download. So I think the first time when you ran it, you didn't have a test class. So there.

A

C

Nothing for it to do for surefire to do so. It didn't download any of the test scope dependencies, but when you ran verified the second time that you said hey, I've got some stuff to do, but I don't know how to compile this stuff. Let me go out and download everything I need.

B

Correct- and that applies to let's say the version as well. So if I have uh a dependency and I updated the version, it's gonna again download the newer version right.

B

Okay, all right! So, as you can see on the screen, we did run the maven verify and exist expected. We can see test, run five, no failure, so all our tests passed. So that's that's a good step. Again! Congratulations uh for completing step, two out of five, so we should have.

C

Like an icon that has like a pat on the back kind of thing,.

B

C

Pat yourself on the back.

B

You know actually, on that note, I I saw a patent online uh pat on the back patent. You can you, can you? Can google right now, like pat on the back patent, so someone actually paid in an idea of a device which, like you attach here and then you, you move that and then the mechanical arm that pats you in the back? This is apparently a patent on that okay.

C

So, coming back to the we're a bundle of useless knowledge, we should go on jeopardy right.

B

So coming back to to rest so so far you have your application running locally, so no one can access that right. So on other than yourself, so opening up to the internet means you add some rest endpoints, so that folks from the internet can can talk to your application, uh see the list of the fruits you have so for that we'll start with the fruit controller.

B

uh So you can see this. This class has and again an empty to do so. If I click copy to editor, uh we'll add those those methods, uh it doesn't have anything else except slash. Api, slash, slash fruits, which is just the list tongue twister, um okay,.

C

Let me let me throw something else in there, too people a lot of people with spring are familiar with, like the thing called auto wired and you notice there's no auto wired on the fruit repository and you might start like asking why. Why is there no auto wired and that that goes to what's called field injection versus constructor injection? And although the spring team doesn't come out and say it, you know in any other documentation they, they really do.

C

Recommend constructor injection over the field injection for a lot of different reasons, one as a myself as a committer. If you do field injection your, they won't merge your code. You have to do it this way as a committer, but there's a couple different reasons.

C

Why and if you think about it, passing your dependencies that a class depends on if you just have them as fields, it makes it really hard as someone who's trying to use that class to know what what things do, I need to provide this class in order for it to function properly right by using constructor injection. It's pretty obvious right.

C

It's a kind of a self-documenting thing, plus there's you know, I don't know how measurable it is, but there is some performance benefit because at run time it doesn't have to use reflection to do the injection. You can just call new past the thing and be done with it.

C

So just a little little tidbit of information.

B

No, no, that that that's that's! uh That's a lot of helpful information, so here, if we see the the method um find all so you can, you can find this method uh in the classes we have written. But if you see it, the the type of repository variable is fruit repository.

B

So if I see fruit repository, it imports this particular package and if I look here in the document in the spring documentation and try to find this method find all I can see where it gets the the definition of the method so coming back here, uh so we added uh the the fruit repository class. uh Well, we added that before so here we added fruit controller class. Let me open up fruit controller right here here, so we added fruit controller with some to to add additional service calls here.

B

So with the empty service calls, we can now again run maven springboardrun. At this point we are skipping the test because we actually don't have any test tool to test the endpoints which we haven't added. So you can see that jvm is running. I can go to my local web browser and see it here and if I try to add watermelon at this point, we still can't because we don't have the methods uh in order.

A

B

Add add a fruit, so so that's, okay! Next uh we'll create additional service. So here we can update, create and delete. So if I click copy to editor, so you can see um the post mapping uh this dot repository save so this should let us save any new fruit that we're adding uh to the list eric. Do you have any comments on on any of these.

C

No, no, it looks.

B

C

Like, like anything in software engineering, there's a million different ways, you could solve the same problem and the same holds true in spring I mean there's like you notice, there's, like some exception, handling and validation handling. That's there that's one way you could do it there's probably five other ways that you could do it as well.

B

Yeah yep, so I know you all have been waiting eagerly to to see the watermelon uh eric's favorite fruit on the on the list. So.

A

B

If we can get that working uh in this try and this time, I'm not gonna click. This link right here we can go from this link which should take us to the same list all right. So, let's see water melon.

B

There you go honestly on a hot summer day. We now have the essential watermelon in the list and talk about uh good fruits. Apple in this list is my least favorite fruit. So let me try to remove it. Okay, yes, we.

A

Are able to remove.

B

So it seems the methods that we added are working. We can. We can see the list which is just in slash api fruits, and then we can add a fruit. um We can even update the fruit right, probably we can say red cherry.

B

So we can. We can update the fruit. So if you're watching this live or you're watching this at a later time, we have a challenge for you. So let's say watermelon. If I add it again, it adds a second watermelon, so the the to do for you if you're watching it at any time now or in future. uh How do you add a check so that it doesn't add the same fruit to the list?

B

So that's, that's. That's your to do all right. So, let's, let's do a conclusion. My.

C

Mind's already racing challenge accepted. You know after this I'm gonna have to go off and do that I'm one of those kinds of people that I can't just like you can't let it go.

D

C

Can't just let it go it'll bother me like, I won't be able to sleep tonight, it'll just he's gonna.

A

C

To wake you up in the middle.

A

Of the night haunting your dreams, kind of thing.

C

D

C

One watermelon, you know I really like watermelon, but only one at a time. I can't have two watermelon it'll go bad. You can't eat it fast enough.

B

Now imagine that.

C

B

Are chasing you with a watermelon giant water? There.

C

B

Okay, so let's clear up the screen continue to the next step, so all good. I know we've been talking a lot about uh the local uh environment and and building a spring app, but now you have to deploy and let's deploy to the best platform, best kubernetes platform on openshift okay. So if you haven't used openshift before, uh let me show you one more scenario.

B

So if I go to learn.openshift.com, uh I think somewhere at the bottom, you have openshift playground, so you can go to openshift playground and choose, whichever version will say openshift4.7, and it's going to give you one more 60 minutes um um sandbox, where you can type in different commands and learn about openshift and once you're familiar you can all the instructions are here by the way, but in case you want to get more familiar with openshift you can have. You can have that playground so coming back here.

B

So we have our code right here on this directory and the first step would be for you to connect to your openshift cluster. So since this is a sandbox, we are already connected to the openshift cluster oc. Who am, I will show us like who's, the who's, the current user?

B

So it shows we, we are the admin, so we can do a lot of stuff.

C

Admin oc delete all dash dash all that, and that's all that sounds like a.

D

B

For that, for that we need auth z, not.

D

A

B

We need audsey who can do what all right.

B

So, let's, let's be, let's just create a simple project: let's not cause any havoc, um let's say you do something and that oc delete and then chris's internet goes down again right. So we don't want to do that. Why.

A

It's got to be again, it wasn't my fault this time.

A

B

Prevent natural.

A

Disasters, I'm sorry.

B

Using using ocd lead commands could could cut cause natural disaster. No, that's that's not true, since we're on air.

C

Chris isn't going to invite me on any more of these things.

B

B

Okay, so now that you have, uh you are authenticated to a cluster. You have created a project, let's actually go to the openshift web console uh oops. Let's try again open shift console.

C

You should probably mention too. The whole scenario itself is running on an open shift cluster so even like when you're doing ls and you've got that nice terminal. What not you're already on an openshift cluster. So.

B

Yes, you just go.

C

Into the same cluster, just a different project.

B

Yes, yes, and, and uh probably um this will be fixed at a later date, but if you're, if you're trying this scenario now, I will suggest you use admin admin credential to log in rather than develop a developer, because um if you are developer, you probably won't be able to switch projects uh right now, because we are using dev project and let's say, if you're a default project, you probably won't be able to switch right now.

B

So if you go from here administrator, you can see all the projects. Dev is the project we are. We should be on and now, if I switch the perspective to develop perspective, we are in dev. We shouldn't have any resources, a clean slat, so first step uh after you create the project would be uh creating a database, a postgresql database.

B

So remember we were using an h2-data database in in previous steps, but now you can- and that is as simple as oc new app uh and some some uh environmental variables for for the username and password, uh and then you specify this is the image image name, openshift postgresql and the version- and you give it a name.

B

So once you do that, let's go back to the topology and see you can see now the database is starting up um if you're using openshift. For the first time the the cyan blue circle means um the deployment config or the pods are still starting up. It's not running, and I think the solid blue yeah right like that. It means it's running. So if I hover my mouse, it says it's running all right, so you can see the database configuration here, source main jquery, deployment.yml and again you can go.

B

You can navigate from here or you can just click right here and it's going to open up which will show you, the db username, the tv password and.

C

So should we talk a little bit about what jqb is so like? Yes, please, yeah yeah, so j cube is a it's a set of maven plugins for interacting with kubernetes platforms and openshift being one of them. So it's a way where you can take your application, your java application, it's not real specific to spring, but I just through running a maven command, deploy that application to a kubernetes cluster, in this case we're using the the openshift maven plugin, because it we're dealing with openshift.

C

So there's some openshift like a deployment config instead of a deployment and a root instead of an ingress and all that stuff, and so what you can do is if you go back to your editor there and you go into that source main j cube directory. Is you notice this? If you scroll up to the top of the editor, that's not a complete! Actually, this one is a complete one, but it doesn't have to be a complete manifest file. It could be just what they call a fragment.

A

C

It'll create the j-cube plug-in when it runs, it'll actually create all the necessary kubernetes manifests and it'll look in this source main j-cube and, if you've specified anything. So in this case, it's like deployment or deployment. Config.Yaml it'll apply those on top of whatever it generates. So if you overwrite something like an environment variable section or what add some labels or whatever it'll apply that on top of whatever it generates before it does the actual deployment.

C

This is kind of the next incarnation to do. There was the old fabric eight maven.

A

C

And suite of tools, yeah.

A

C

This that kind of died on the vine and- and this is the new incarnation of that which reuses a lot of the code. But it's it's a little bit more structured because I you know I'll throw my hand out there and say I'm a gradle fan and not a maven fan that this kind of stuff didn't exist in gradle before I still don't think it does. But it's it's getting there, because they've done a lot of refactoring and a lot of retooling around how the code is structured.

C

So that's my two minute spiel here.

B

No, that that's that's very important and also uh eric like here. I see that for for openshift, maven plugin. uh It helps with like building s2i images. So, for example, when we do that the command we haven't executed yet, but when we do mavenoc deploy uh we'll be able to see like how it builds the image before actually deploying it right. So s2i is one one mechanism where openshift builds container images right from your source repository, so you don't have to have a docker file. It's just one of the techniques.

B

How openshift builds right, so I can see that openshift may even plug in uh it has an integration. If we may say uh to to build those s2i images.

C

Yeah so s2i I mean, I think the term s2i gets thrown around and there's really three different use cases that we call source to image, there's true source image, which is like what you just said, where you just give it a github, repo or bitbucket or whatever and it'll, actually take your source, compile it and then create a container image around it.

C

But in this case we're actually doing what's called a binary build where we're going to use maven on our in I'm in air quotes here local environment, which is our catacota environment, to produce the uber jar.

A

C

The we'll just tell openshift, hey openshift, I've already built the binary, just wrap it in a container image and deploy it for me, and so that's still considered and again in air quotes here. S2I.

A

C

But it's not actually doing the maven build. It's.

A

Right, that's already.

C

Built because I know a lot of organizations at least where I used to work part of our build process. We take that jar that uber jar and we'd still publish that to like nexus or artifactory or whatever.

A

C

You're using because you might want to run that outside of a container somewhere, you know in some way shape or form, but then you need a container image to run it on a kubernetes platform like openshift.

B

Right right- and that reminds me of the pre-container era, where the actual jar was the the deployment artifact like you, produce the jar and the j. That's the jar you pushed onto some other vm and that's what around the server, but now is the container, and the container image is what you use to deploy your image.

C

Is cool too because, like if you had a local you're in again in air quotes if I were doing it on my laptop here, you know a lot of organizations are so locked down. You can't even install a java runtime right right. So assuming you had a java runtime, but you can't install the docker runtime. You know that's forbidden, especially in financial services, which is my.

A

C

You can still do this and build container images, because the container image part of that is not actually happening on your machine, and so you don't need the the darker runtime.

B

Wow nice got it so coming back, so where we were was we logged into the openshift cluster? We created a new project called dev. We created a postgresql database called my database and we could see in the topology that you have your my database, but we don't have the app yet but before actually creating the app we again have to so. If you remember the palm.xml, it had lots of to do so in the last 20 minutes or so so we added all those studios, but one to do or two to do actually are left.

B

One of them uh is the postgresql dependency. So if I click here it has the postgresql database and the final dependency is a health check. So using uh springboot provides something called actuator and it exposes like that, slash health matrix um and if I click here I think that's the.

C

Same what's cool about that, if you're going back to the j cube, conversation is j, cube kind of understands. You know that your app is a spring boot app and that if you have actuator it knows that it has health and uh ready and liveness probe endpoints already built in so it'll, add those to the deployment and the or the deployment config for you automatically that gets deployed. So you don't have to go. Do that.

B

B

So now that our palm.xml is complete, let's actually deploy to openshift single command. I think there's a maven package like build, but if you do like deploy deploy, uh does the build and deploy all together.

B

So let's click that um and you'll see um more of the.

C

World needs to be downloaded more of the world needs.

B

To now now is that the other parts of the galaxy being downloaded uh and then uh let's, let's show the topology. This is.

C

Actually, gonna take a few minutes, because the container build will take a minute or two to do so.

B

A

I mean I can put on some music if you, if you want us to, I mean we could talk about my book. We.

C

Could talk about mine yeah, so I I don't know if I did it in the introduction, but you know my background is spraying I'm uh or at least I was for a period of time. I committed a lot a lot of stuff in spring security, but I was, I was a committer and a lot of spring stuff and for those who haven't heard of this thing called corkus.

C

That's out there, I've written a book, that's going to be published in august at some point mid to late august, we're looking at quarkus from a spring developer's perspective, so looking at a lot of the conventions like spring data jpa and controllers and cloud and kubernetes, and all that kind of stuff, but looking at it from the eye of a spring developer and kind of showcasing side by side hey. This is how you do something in spring, and this is what it looks like in quarkus and by the way, it's not really so different.

C

You know, there's really not a big learning curve to it right so.

A

C

So do we have a link.

A

To the book yet or do we know where it's going to be when it does come out.

C

And fortunately, we're still we're we're. Building that now it'll be on developers.redhat.com there'll, be a link. It's free! It's not something we're going to send you to amazon and make you pay 50 bucks for it. Yeah.

A

It'll be on the e-book.

C

A

It'll be on every page.

C

Cool, hopefully the end of august it'll it'll be out.

A

C

Yeah, I don't know how books.

A

B

Just to keep it on air eric did promise me a signed copy of like physical copy of the book, a signed physical copy of the book when it comes out. I've only.

C

Have a handful of.

A

C

Yeah we're hoping to do a few printed copies as we start to get back to in-person events. You know. Finally, you know these virtual conferences are kind of I'm tired of.

A

They are, they are.

C

Yeah, they are what they are, so we're hoping to have printed copies, and you know I'll do autograph sessions and whatnot. If anybody wants it. Autograph sessions just have.

A

You in the red hat booth at the next conference signing books.

C

That's right, who's.

A

That kind of sending books.

C

I get a crowd around me. I must be important right.

C

It looks like it's done now that we've, yes, that was plugged.

B

Is complete? No, that was a very important plug now that the build is complete part of part of the command. You can see like your familiar docker like commands, or you can see like step one two like you see using a base image, um so you can see like how the the image is built in in different different parts.

B

um So once the build is done, we can go back to the topology topology view and you can see now the the deploy con the deployment config is there. uh You can also check from command line uh oc rollout status. The name of the deployment config is spring getting started.

B

Let me clear up the screen and it should say successfully rolled out, so this is running on open openshift. This is no longer your local local machine and if we click here, we should see the same fruits app and, let's see, if we can add eric's favorite fruit.

B

Yes, we can eric, finally can have watermelon on openshift. So so so I think that's, that's the that's the demo piece. There is something even more cool cooler, um yes cooler. So so let's say this is a 60 minute sandbox and you want more right. You want more time you you want.

A

B

Yeah you all you always want more. So I think my friend is gonna. Add a link in the chat or comments for red hat developer, sandbox.

A

So it's actually in the lower third folks that uh qr code there will teach you straight to it perfect. So.

B

Red hat developer sandbox, so you can get started on the sandbox for 30 days. You'll have an open shift cluster. Absolutely no credit cards required, no swiping needed no swiping needed. So since I have already have the sandbox, if I click and start using my sandbox, it takes me right to my sandbox and here I already have this deploy.

B

But let me delete the previous deployment just to show how I can also use my sandbox to deploy the application um for the sake of time I'll keep the database I'll just keep the database for the sake of time.

B

So, if you see at the end of of your scenario, you can fork the repository so for that there's a there's a nifty little script that my friend eric uh uh written and if you click here, um it's gonna give you a code, this code right here and then you copy the code right here um to for device activation.

B

um I'm already like I already authorized github before and I already went through with the forking of the repository. So if I come back, if I close right here uh and come here.

C

Got to follow the instructions you're going to press enter there. You go yeah.

B

Yeah there you go authentication complete.

B

Press enter to continue.

B

um Are you sure you log out no.

B

All right, so, if I come here right.

C

Not just over there that the the credentials that you entered like for github are the learn.openshift.com platform knows nothing about that. That's a complete like oauth call using the github cli yeah.

A

C

No access to any of the credentials or anything there.

B

Right, so you can see that the repository I have it here, forked and then on my local. So this is my local machine. uh I have again if I do ls-la, I I have the uh the clone version of uh of the repository that we just forked and now I'm I'm gonna, deploy it on my sandbox environment, which is right here. So let me just copy the the actual maven oc, deploy command and copy this one right here.

C

You should mention, too, that there are two branches in the repository the.

B

C

Branch is kind of like where you were starting from at the beginning of the scenario with all the to-do's in there and then there's also the solution branch, which is what you got at the end of the scenario. You know what you should have.

B

Yes, so once you once, you check out, you'll, probably be with a master branch and then, if you check out solution, uh you'll have the the all the solutions. So you just completed something on learn.openshift.com. You probably don't want to redo the same thing you just want to deploy. You can check out solution, brands and, let's say the project I'm on right. Now, I'm on tv, that's fine! I'm just going to deploy on this project.

B

I already have the database, which was created before so now, the same command that we ran before, but this is not on on a 60 minutes cluster. This is actually now going to deploy on your 30 days.

B

Developer, sandbox cluster, um similar similar command for for building the the.

C

B

uh Process first and then it will create the deployment.

C

Config yeah, just kind of while that's going add-on that the the 30 days it expire. It will destroy automatically after 30 days. But even right after that, you can come back and do another one right.

A

C

For another 30 days.

A

C

Credit card required.

A

We discourage you from running production like that, though,.

C

A

Have a really good ansible.

C

Playbook right to be able to recreate everything from.

A

Wherever yeah I mean you need something like load, balancers and all kinds of stuff to even make that work. I feel like so yeah. Don't do that.

C

There's some resource constraints and resource quarters.

A

C

You get like, I think, two or three name spaces that you can use, that you can't change the name of, and you can only run so many cores or memory workloads or something I don't know exactly what the quotas are. But there are some quotas that can enforce.

B

Almost done almost.

D

B

All right, it's finished now uh the pod is not yet running uh it's container, creating stage. uh Let's see.

C

A

Within a few seconds,.

B

If I go to the url right now, the application should be down, and as soon as the the circle turns solid, blue.

C

B

On yeah, I was just.

C

Insane, it's kind of cool you can actually go and see. What's going on and watch then tell the log in real time.

B

Yes, all right, so if I refresh the page with our familiar application, but this is on a 30-day developer, sandbox all right, so I I know I took a bit of extra time, I'm going to stop sharing right here and let eric take over.

C

B

Eric you got that.

C

15 minutes I'll talk really really fast.

B

Have the dinosaurs start chasing you that'll help yeah.

C

Dinosaur, I gotta get really so I am actually a runner, but I'm a distance runner, not a not a sprinter, not.

A

C

A

C

For the long haul, you know not not the short distance here, yeah.

A

C

That that's all kind of cool, you know what we what we just did, but you know one thing that a lot of developers, kind of you got to kind of figure out is okay. I deployed this environment and I deployed you know I tied my app to a database right and we did that through environment variables. So how do I take that application and then move it from dev to qa to integration test to smoke test?

C

You know, whatever you know, end number of environments you have until you get to production and I'm going to use the word environment in air quotes again because in the old days you know an environment was a physical environment. You know it took weeks months years. You know, however, you submitted a request and you needed a bare metal server or vm or whatnot, and then god forbid, you need a new environment. You know where everything needs to be wired. Together I mean that you know the ops. People just need to send them on early retirement.

C

If you start mentioning that kind of stuff, so kubernetes and openshift make that really really easy, and what I'm going to do is I'm going to there's actually another scenario here that talks about externalized configuration and I'm going to kind of blow through some of the setup stuff, because it's you know essentially the same stuff that dejuan just did you know once this thing is my font, size, good and what everybody can read? What I'm doing here uh go up on more one, more.

C

Just waiting for the environment to.

B

C

B

Let me start it again.

D

Did we break the internet, it's possible.

A

We've been known to break things on this show not the whole internet, but.

C

You know here we go all right so that that's going it's pulling down the the jdk and whatnot um once that's done all right, we're good to go. So I'm going to start it's the same source, repo, just there's a bunch of different projects in that source repo. So it's the same source repo, just a different folder within it. I don't know if I can make this bigger, but um so essentially we've got uh that we're still dealing with fruits. We've got a fruit controller, except this one's much simpler.

C

It doesn't have all the whiz bang stuff that dejuan was just showing with like the list and being able to do stuff. But what this really showcases is. I'm gonna read a property from a properties file and I want to change that property without having to change my applications. Kind of simulating as if I was moving, my application from one environment to another and hooking up different configuration to it. So we've got and again you know I talked about in the in the last one. You know we talked about constructor injection versus field injection.

C

Well, here's here's the field injection example. Here we've got this other bean called message: properties, which is a a good way to if you, if you just have like a one-off property.

C

Great you know spring, has that value annotation, that you can use to inject a property value, but if you need a bunch of properties that are kind of somewhat related to each other, and you want to do validation on it or you know strong typing, that kind of stuff you, you would build a spring call as a configuration properties class and you can you can you see this? One has validation and it makes sure that there's actually a message.

C

You know a greeting.message variable and if your application goes to startup and it's not there, it won't it'll fail to start. So it's doing some some startup validation that you're, that your properties are there, and so, when we run it look again, air quotes here locally. We have our greeting.message and you notice it's a it's kind of an injection. Your favorite fruit is, and then the the thing that gets injected is what you actually passed in the in the um as a request parameter.

C

So if I run this guy, I should have run this guy. While we were talking because maven needs to go down with the internet.

C

I'm a theme on this show yeah, it's a theme. Next time, it's run the thing before you start talking right, mm-hmm, yeah lesson learned postmortem all right. So all that goes we'll um I'll, actually open a new channel just to kind of show off a little bit of the catacota stuff. You can open new terminals as well and whatever the active terminal is, is, I think, where the command goes. So if I click the command, it goes into the new terminal, so we're kind of doing stuff in the background here.

C

So one thing that you kind of need is with some of this actuator stuff. If the one thing in in this project, we're using is the um the spring cloud kubernetes spring boot starter in this case, specifically the config starter, which means gives us the ability to to natively our application to natively, use the cube api to read, config maps and secrets right and those are two object types within kubernetes. But in order to do that, your project needs a policy.

C

The service account that runs the pod needs a policy that gives it access to that cube api. So we have to add that by default, openshift doesn't allow that doesn't allow you the default service account because we're just using all the defaults here. So we've got to add that that role to our user and then we'll create a config map. So in the source here, we've got the source main etsy application. We've just got a greeting message that we're going to create, as as a config map, all right.

C

Oh because I'm in another terminal, I'm not in the right directory here, did everything finish.

C

Yeah everything finished. So if I run that on this terminal it created the configmap. But if we want to go to the openshift console, we can actually see that.

C

What do we say? Admin admin always administrator, give us.

D

The most destructive.

C

A

Give me root and I'll give you a broken system.

C

Yeah and I always promise not to break anything right and.

B

Cross my fingers behind my back.

C

Kind of thing, so if we go to the dev project and we look at our config map so now there shouldn't be any nothing really running here, but we do have a config map and if you look at the config map, there's a there's actually a whole application.properties file. That's embedded in the config map, there's a bunch of ways. You could do it. You could do it this way or you could just specify the properties.

C

So I could just have a greeting.message without being part of the file, and that would work just fine, the the underlying spring boot starter. For that you know, doesn't really care how you do it at least the last time I checked and then we're going to deploy this to open shift again. Cue, the cue the elevator music.

C

To do so so how about them? Mets.

A

Yeah, how about the mets they doing? Okay, for you this year,.

C

A

Know I thought about this. I gave up.

C

Baseball a long time ago, yeah.

A

I know the tigers uh are being awful this year, so uh well, not awful, but you know not up to the standard detroit is used to. I feel like and dejuan.

C

A

C

You must be a hockey guy. Well is.

B

That just a stereotype yeah, it's not like a really bad stereotype, yeah yeah. On the on the topic of stereotype. I have that if you want to connect.

A

That's fair. I like zimbabwe. I can.

B

Bring some poutine as well and then holla to my friend moves somewhere in my backyard.

C

So maybe what I'll do here? Because we've got some limited time, is I'll just kind of skip to the thing I want to talk about. You know once while maven's downloading the internet again um at the very own, at the very end of every scenario, all the spring scenarios, all the corporate scenarios. You know dejuan showed the you know being able to fork it to your own github and downloading and clone it and use the developer sandbox, which is all cool stuff. One thing: that's there as part of the developer.

C

Sandbox is a what we call code ready workspaces which is based on the the upstream eclipse che, which is an ide. So if you don't even have an ide on your machine well, who doesn't have an id? But if you don't have an idea machine, you don't have all the right, tooling or the java versions or all that kind of stuff.

C

You can use the the code ready workspaces. That's there as part of the developer sandbox, to actually develop your your your applications and like this catacota environment, it's running in the cloud and it's running on the openshift cluster, and so you, you use the same red hat account. There's a link here you would click, uh it takes a few a minute or so to start it up so, like any good cooking, show I've already kind of put it in the oven and and taken it out.

C

You know in real time here so it would actually load the solution. We talked about the two branches, it would load the solution branch, but it would filter. You know when you've got the repo just cloned there's a bunch of projects in there, so this that would actually filter it to the one that you're actually working on in that scenario, so the whole source code is there, you can do all the same commands. There's this nice little thing, that's pre-configured for you with all these different tools.

C

If I want to build the app I can just click it and it'll go and again I actually. I think I already did it, although it does have an idle time if you leave it idle. For I don't know, I don't know what the timeout is, but the pods will stop, um but it should have noticed it didn't have to re-download the internet. It does have persistent storage.

C

So even if your workspace stops as long as you don't destroy it and you restart it all stuff, any changes you made are still there on the file system because it all the persistent storage is attached. If you see it build, I could do an open shift deploy. I could run it and then in the air quotes again locally against my local machine. I think it'll actually fail, because it's looking for a postgres database.

C

Maybe it uses h2. I forget, I built the scenario, but I can't remember what I did: no, it actually works and if you notice it's got this little hey, I see that there's something running on 8080. You want to open it. I can either open it in this little preview thing that comes up over here or I can just have it open a new tab and voila I've got my my thing built, make it a little bigger.

C

I like watermelon, all right that I can say it, your favorite fruit's watermelon, but what's cool what we wanted to show as part of the scenario you know now that it's actually deployed. If I go back and I run using the local, not local web browser, I actually wanted to go to the openshift console by cooking. Here.

C

I've got the same thing. If I say watermelon, you see, it's greetings. You've picked watermelon your favorite fruit. If I go back and I actually edit this config mat so instead of greetings, I say bonjour: do you speak french up there? I know I know enough french to be dangerous. Yeah me too yeah. I.

B

Know I know all the slang.

C

Words that all my friends have taught me right nice, so I can save the config map and if I come back here and I instead of watermelon, I say banana, they say now. It says bonjour, because it's picking up the change, I didn't even have to restart my app it's picking up the change nice, and so you could see, as I started, deploying the same app and multiple namespaces with the same config map just with different values. It would, you know, pick up pick it up or even pick it up on the fly.

C

That being said, there's always the question is this is a good thing to do and you need to be careful about what things you're going to change at runtime on the fly right, because your application as a whole is your app that you deploy that's static and your configuration, which is at run time and the combination of those two forms like a versioned view of your application, and if you start changing things on the fly, how do you make sure that those changes get back into source control and configuration drift and all that good stuff that we could have a whole separate conversation on?

C

So I think that's that's what we wanted to showcase here and look at that three minutes.

B

Amazing not not just a uh martial arts, ninja.

C

I don't climb walls and I don't wear well. I guess I do wear masks right these days, not the the type of ninja mask you're thinking about, but.

A

Yeah, that's a good point all right! Well, thank you, dewan and eric. This was awesome to see in demo and everything uh if there's any questions after the fact feel free to reach out to me on twitter at chrisshort or short at redhat.com, and I will forward your message to the right people um but yeah. Thank you for demoing this today, dawan, that's and and eric. uh This was a great great stream, really appreciate it.

B

It's our it's uh our pleasure and uh thanks chris uh and bobby, and all the folks making the the show always as awesome.

C

A

Having me yeah, you know for how many times thank.

C

C