Kubernetes and cloud native computing changed the way how we deploy and operate applications and workloads. Besides stateless applications there is of course still the need for more static components like MySQL databases. In this talk I want to discuss the question if it’s a good idea to run MySQL databases on Kubernetes. Spoiler Alert: Yes, absolutely with Vitess, a CNCF graduated software project! Especially if there are more sophisticated requirements like horizontal scaling.

1. stackconf 22 Berlin
RUNNING MYSQL
WITH CONFIDENCE
ON K8S

2. -NETWAYS
-since 2010
-Head of Managed Services
-Dev and Operations
-think forward - spin in circles
SEBASTIAN
SAEMANN
NICE TO MEET YOU, I’M

3. FICTIONAL COMPANY

4. -Developed a fantastic web-app
-Everything is already running in containers
-Kubernetes of course is the platform of choice
-MySQL as database backend
FICTIONAL COMPANY

5. MYSQL?

6. “DON’T RUN STATEFUL
WORKLOADS ON
KUBERNETES!”
RANDOM INTERNET PERSON

7. -ephemeral storage
-data gets wiped at reschedule
K8S OPTION #1
MYSQL ON LOCAL DISK
POD
APP

8. -adds latency
-lack of high availability
-crash recovery could take some time
K8S OPTION #2
MYSQL WITH PVC
POD
PVC
APP

9. -designate the current primary
-app connects directly to pod
-trigger app on failover
-restore and initiate pod
POD
K8S OPTION #3
MYSQL REPLICATION
PRIMARY REPLICA
POD
APP

10. VITESS

11. -cloud native database
-based on MySQL
-sharding middleware for MySQL
-born at Youtube
-CNCF graduated project
-highly available
-horizontally scaleable
VITESS

12. ARCHITECTURE APP
VTTABLET
VTGATE
TOPOLOGY
VTTABLET VTTABLET
SHARD 1
SHARD N
SHARD N
ORCHESTRATOR
VTCTLD

13. -discovery of primary and healthy replicas
-automatic reparenting
-backup and restore
-replication for persistent data and HA
BENEFITS COMPARED APP
VTGATE

14. SCALE

15. VTTABLET
VTGATE
TOPOLOGY
VTTABLET
KEYSPACE: RAILS
DEMO APP
VTTABLET
KEYSPACE: CUSTOMER
VTTABLET VTTABLET
-Vitess-Operator
-Create a new Vitess Cluster
-Connect our App
-Scale out using more replica
-Move table to additional instance

16. DEMO

17. CONCLUSION

18. stackconf 22 Berlin
NWS.NETWAYS.DE