In this chapter we will focus on networking aspects of your workloads. We will
first review the defaults that Kubernetes proper comes equipped with and
what else is readily available due to integrations. We cover
networking topics including East-West and North-South traffic—that is,
intra-pod and inter-pod communication, communication with the worker node
(hosts), cluster-external communication, workload identity, and encryption on the wire.
In the second part of this chapter we have a look at two more recent additions
to the Kubernetes networking toolbox: service meshes and the Linux kernel extension
mechanism eBPF. We try to give you a rough idea if, how, and where you can,
going forward, benefit from both.
As you can see in Figure 5-1, there are many moving parts
in the networking space.
Figure 5-1. Network layer model
The good news is that most if not all of the protocols should be familiar to you, since Kubernetes uses the standard Internet Engineering Task Force (IETF) suite of networking protocols, from the Internet Protocol to the Domain Name System (DNS). What changes, really, is the scope
and generally the assumptions about how the protocols are used. For example, when deployed on a worldwide scale, it makes sense to make the time-to-live (TTL) of a DNS record months or longer.
In the context of a container that may run for hours or days at best, ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month, and much more.
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.
Julian F.
Head of Cybersecurity
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.
Addison B.
Field Engineer
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.
Amir M.
Data Platform Tech Lead
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.
