Présentation de Philippe Collignon (StarObject) @Geeks Anonymes Liège, le 22-1-2020

1. phico.io
Kubernetes

2. phico.io
1980 Machine physique – Applications monolithiques
A complex idea can
be conveyed with
just a single still
image, namely
making it possible
to absorb large
amounts of data
quickly.
A complex idea can
be conveyed with
just a single still
image, namely
making it possible
to absorb large
amounts of data
quickly.

3. phico.io
2000 Machines virtuelles – Applications monolithiques
Hypervisor
Host OS
Guest OS Guest OS
VM VM

4. phico.io
2020 Containers – Applications micro-services
Container engine (docker)
Host OS
Container Container Container
Container Container Container

5. phico.io
Etat réel
Kubernetes Principe
Etat souhaité

6. phico.io
Kubernetes Architecture
Kubelet
Kube-proxy
Controller
Manager Scheduler Etcd
Kubernetes API
Master Worker 1 Worker 2
Kubernetes Cluster
Kubelet
Kube-proxy

7. phico.io
Pod
localhost
ContainerContainer
Volume

8. phico.io
Deployment

9. phico.io
Deployment
Etat réel
version 1.1
version 1.2
Rolling update & rollback
Etat souhaité

10. phico.io
Jobs
7x
apiVersion: batch/v1
kind: Job
metadata:
name: myjob
spec:
template:
spec:
containers:
- name: mycontainer
image: busybox
command: ["/bin/sleep", "3"]
restartPolicy: Never
activeDeadlineSeconds :120
parallelism: 2
completions: 7
backoffLimit: 3
Job controller

11. phico.io
Service
Kube-proxy
Worker 1
Kubernetes Cluster
Kube-proxy
Worker 2
?ClusterIP
NodePort
LoadBalancer
Kube-dns

12. phico.io
Ingress
Kube-proxy
Worker 1
Kubernetes Cluster
Kube-proxy
Worker 2
Ingress
Controller
http://../foo/
http://../bar/

13. phico.io
Volumes
Pod
Container 1
/ /
Volume

14. phico.io
Volume
plugins
NFS
EmptyDir
AWS Elastic Block Store
Azure File Storage
ConfigMap
GCE Persistent Disk

15. phico.io
Persistent Volumes
Pod
Container 1
/
Persistent
Volume
Persistent
Volume
Claim
Static
(PV)
Dynamic
(Storage
Class)

16. phico.io
ConfigMap & Secret
$ENVVolume

17. phico.io
Kubernetes Autres fonctionnalités …
▪ Namepaces
▪ CronJobs / Daemonset
▪ Readiness / Liveness
▪ Statefullset
▪ NetworkPolicies
▪ Sécurité (RBAC, service account, …)
Les principales idées :
▪ Orchestrateur de containers (Déclaratif)
▪ Haute scalabité / Haute disponibilité
▪ Abstraction / Découplage

18. phico.io
Kubernetes Histoire
▪ LXC : Linux Containers (2008)
▪ Google Borg
▪ Docker (2013)
▪ Kubernetes 1.0 ( 2015 )
- Open Source : CNCF
▪ Kubernetes 1.17
- De facto standard pour la gestion de containers ..
- Alternatives : Swarm, Apache Mesos
- Produits associés : Ranger, OpenShift, PKS
▪ http://kubernetes.io

19. phico.io
Kubernetes
▪ Philippe Collignon ( @phcollignon , philippe@collignon.email )
▪ Ingénieur physicien ULiège
▪ Freelance DevOps ( Starobject )
▪ Projet IoT + Kubernetes
▪ CKAD
▪ Cours sur Helm @ Pluralsight
apt install mysql
helm install stable/mysql
Helm