SpringOne 2021 Session Title: Next-Generation Cloud Native Apps with Spring Cloud and Kubernetes Speaker: Ryan Baxter, Staff Software Engineer at VMware

1. Next Generation Cloud
Applications With Spring Cloud
and Kubernetes
September 1–2, 2021
springone.io
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2. Safe Harbor Statement
The following is intended to outline the general direction of VMware's offerings. It is intended for information
purposes only and may not be incorporated into any contract. Any information regarding pre-release of
VMware offerings, future updates or other planned modifications is subject to ongoing evaluation by
VMware and is subject to change. This information is provided without warranty or any kind, express or
implied, and is not a commitment to deliver any material, code, or functionality, and should not be relied
upon in making purchasing decisions regarding VMware's offerings. These purchasing decisions should only
be based on features currently available. The development, release, and timing of any features or
functionality described for VMware's offerings in this presentation remain at the sole discretion of Pivotal.
Pivotal has no obligation to update forward looking information in this presentation.
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3. About Me
● Husband, Father
● Long time Java developer
● Spring Cloud Engineer
● Exercise Enthusiast, OCR Athlete
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4. Spring Cloud: Origins

5. Cloud Native Applications
Back in the day...when we didn’t have cloud
platforms
● Service Discovery
● Externalize Configuration
● Prepare for failure
● Load Balancing
● Routing
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6. Lets Make Things Simple
What if we create a platform that made
these things easier?
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7. Spring Cloud In Action
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Git
Config Server
Service Discovery
Server
Boot App A
Load Balancing
Circuit Breaker
Tracing
Boot App B
Tracing
RabbitMQ

8. App or Platform?

9. Spring Apps On Kubernetes
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Config Map
POD A
Circuit Breaker
Tracing
Volume
Env Vars
Service A
(Load Balancer)
POD B
Tracing
Service B
(Load Balancer)

10. Kubernetes Equivalents
● Config Server = Config Maps and Secrets
● Load Balancing = Service Instance
● Discovery Server = Service Instance
● Discovery Client = DNS For Service Host Name
○ http://myservicename
○ Port and Host Name Environment Variables
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REDIS_MASTER_SERVICE_HOST=10.0.0.11
REDIS_MASTER_SERVICE_PORT=6379
REDIS_MASTER_PORT=tcp://10.0.0.11:6379
REDIS_MASTER_PORT_6379_TCP=tcp://10.0.0.11:6379
REDIS_MASTER_PORT_6379_TCP_PROTO=tcp
REDIS_MASTER_PORT_6379_TCP_PORT=6379
REDIS_MASTER_PORT_6379_TCP_ADDR=10.0.0.11

11. Spring Cloud Kubernetes
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Config Map
POD A
Circuit Breaker
Tracing
Volume
Env Vars
Service A
(Load Balancer)
POD B
Tracing
Service B
(Load Balancer)
Config Watcher
K8S API
Server
RabbitMQ
Discovery Client

12. Spring Cloud In Action
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POD A
Load Balancing
Circuit Breaker
Tracing
Service A
(Load Balancer)
POD B
Tracing
Service B
(Load Balancer)
Config Watcher
K8S API
Server
RabbitMQ
Spring Cloud
Config Server
Spring Cloud
Kubernetes
Discovery
Server
Config
Map
Git

13. One Size Does Not Fit All

14. There Is No Right Answer
● A “Kubernetes Native” approach is perfectly fine
● Green field app or coming from somewhere else
● Are you deploying app to other platforms?
● Transitioning from another app platform to Kubernetes
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15. Twitter: @ryanjbaxter
Demo Apps:
https://github.com/ryanjbaxter/spring-cloud-k8s-demo/tree/s1-2021
Spring Cloud Kubernetes:
https://github.com/ryanjbaxter/spring-cloud-kubernetes/tree/s1-2021
Modern Application Configuration in Kubernetes: Craig Walls
Inner Loop Development with Spring Boot on Kubernetes: Dave Syer
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