O’Reilly Velocity Conference 2018 – San Jose, California

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so let’s talk about state in kubernetes there’s two types of state the first one ephemeral it goes away that’s what we just learned about that’s the stateless component here

I started container your application I run it and state goes away when that application is done in exits and goes back to stack this is simple it’s easy and it gives us powerful guarantees as

systems engineers that we can destroy our application at any time furthermore we have persistent state this is the type of state you and I grew up with this is the state that we learned when

we started playing with computers when we were kids if you unplug your computer and plug it back in your state persists it comes back imagine living in a world where you would restart your computer

and you would lose everything on your hard drive persistent state is important because if we’re running stateful applications we have reasonable expectations as software engineers that

we should be able to save something and get it back later regardless of how many times we’ve restarted our applications that’s a little bit hard to do in kubernetes and when I say hard I don’t

want you think it’s impossible I just want you to understand that it’s new I remember the first time learning about managing disks and Linux in like the first time I was like man I really

knocked out some LVM today like really learn that really solid and you know it took me a few years to kind of get there and learn about how the filesystem worked and learn about these different

types of state kubernetes is no different it just takes some time to learn it’s possible in kubernetes that’s the point of the keynote I want you guys to understand that it is possible to do

in kubernetes and then it might make sense for you and your engineering organization to do I get asked this question so much in fact I remember is just the other day we were at the office

one of our sales guys came up to me he’s like Chris this kubernetes ready for stateful workloads and I’m like I mean yeah I can give you my opinion here I think so really it depends on you and

your team it depends on how much you know what your use cases is and more importantly than anything else what value are you getting out of kubernetes why do you want to move there in the

first place come see my talk later today you’ll learn all about the great wonderful things kubernetes can do for you there’s a lot of people in tech thought

leaders you might have heard of who say that you know what I don’t really want to run stateful applications in kubernetes I think that’s great I think a lot of people might misunderstand

what’s happening here though the question isn’t if kubernetes is ready for state the question is a viewer ready to run stateful applications in kubernetes