Containers and Kubernetes,
or There and Back Again
Lukáš Hejtmánek
CERIT-SC
Who We Are and What We Have
Never was so much owed by so many to so few
Viktória Spišaková, Tomáš Zvoník (leaves in June)
Students
Romana Duráčiová, Patrik Ješko
Hardware
43 Nodes — 2752 CPU cores
30 GPU NVIDIA A40/A10
1.5PB SSD storage — NVME+SATA
There
Workflow
Application K8s Infrastructure
Docker image K8s Infrastructure
No VM
Cases
Ask us very nicely, we implement it (k8s@ics.muni.cz)
Find and run docker image
Find, modify, and run docker image
Create own docker image and run it
⇒
→
And
Things to consider
Networking
Is it needed to expose the application to Internet? Protocols?
Storage
How to access data? How to copy?
Security
No root available
Back
How to connect everything together?
docker image dockerfile
persistent volume (sshfs, cifs)
deployment
service
ingress
⇐
Again
Everything goes wrong?
kubectl logs
kubectl exec
kubectl describe pod
Check
container does not request run as root
defines resources (cpu, memory)
correct access rights inside container
Read. The. Docs
https://docs.cerit.io
Practical part
https://docs.cerit.io/docs/webinar2.html