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What is Kubernetes ?
Ahmet Üstün
ahmetustun@comind.ai
1
What does “Kubernetes” means ?
Kubernetes
= Greek for “pilot” or
“helmsman of a ship”
2
Kubernetes
A Production-Grade Container Orchestration System
Google-grown, based on Borg and Omega, systems that run insid...
So what does Kubernetes actually do ?
One thing: Abstract away the underlying hardware. Abstract away the concept
Node.
Pr...
So what does Kubernetes actually do ?
A system for container management in a clustered environment.
Multiple cloud and bar...
Kubernetes’ popularity
KUBERNETES
MESOS
DOCKER SWARM
CLOUD FOUNDRY
OPENSTACK
Google Search interest over time in the 1.10....
Kubernetes general view 7
Master Components
API Server: The main management endpoint for cluster (RESTful interface)
Controller Manages: Handles rep...
Node Components
Docker: A container system which runs on a dedicated network
Kubelet: Is responsible for the communication...
Work Units: POD 10
POD
= A collocated group of
containers (one-to-many)
with shared resources. e.g.
network, volumes.
It c...
Work Units: LABELS and SELECTORS 11
LABELS and SELECTORS
= Arbitrary metadata that
represent identity for
generic grouping...
Work Units: SERVICES 12
SERVICES
= An interface to a group of
containers, which acts as
load-balancer and provides
an abst...
Work Units: REPLICA SET 13
REPLICA SET
= Ensures that the number
of desired pods
"replicas" are running at
any time.
Work Units: DEPLOYMENT 14
DEPLOYMENT
= Declarative way to
describe the desired state
of the application (pods,
replica set...
Work Units: DAEMON SETS 15
DAEMON SETS
= Way to run a Pod on
every node?
Work Units: DAEMON SETS 16
CONFIG MAP and SECRET
= Provides one interface to
manage app configuration
& secrets
12-factor ...
Work Units: DAEMON SETS 17
HORIZONTAL AUTO SCALER
= Automatically scale pods
as needed
- based on CPU utilization (for
now...
Work Units: PERSISTENT VOLUME 18
PERSISTENT VOLUME
= Manage storage with its
own lifecycle. +20 supported
driver plugins:
...
Networking
19
Networking
20
Kubernetes general view 21
Kubernetes manifest example 22
apiVersion: v1
kind: Service
metadata:
name: web-frontend
spec:
selector:
app: webapp
role:...
Kubernetes Dashboard 23
Monitoring
24
Logging
25
Continuous Deployment/Integration with Kubernetes 26
Cluster Deployment
27
Minikube:
https://github.com/kubernetes/minikube
Kubeadm:
https://kubernetes.io/docs/setup/independe...
Kops Use Case 28
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Kubernetes Nedir?

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Abstract:
• Kubernetes Nedir?
• Çalışma prensipleri nelerdir?
• Neler sunuyor?
• Alternatifleri nelerdir?

Bio:
Ahmet Üstün, Comind isimli yapay zeka startup'ının kurucularından. Öncesinde 3 yıl Cybersoft Ar-Ge takımında bulut sistemleri konusunda çalıştı. Bu sürede; Docker, Kubernetes, Openstack ve Aws üzerine yoğunlaştı, projeler geliştirdi. Yüksek lisansını ODTÜ'de yapay zeka ve doğal dil işleme üzerine yaptı. Halen doktora öğrencisi olarak ODTÜ'de araştırmalar yapmaya devam ediyor.

Veröffentlicht in: Technologie
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Kubernetes Nedir?

  1. 1. What is Kubernetes ? Ahmet Üstün ahmetustun@comind.ai 1
  2. 2. What does “Kubernetes” means ? Kubernetes = Greek for “pilot” or “helmsman of a ship” 2
  3. 3. Kubernetes A Production-Grade Container Orchestration System Google-grown, based on Borg and Omega, systems that run inside of Google right now and are proven to work at Google for over 10 years. Google spawns 2 billion containers per week with these systems. Created by three Google employees initially during the summer of 2014 Hit the first production-grade version v1.0.1 in July 2015. Have continually released a new minor version every three months since v1.2.0 in March 2016. v1.8.0 was just released 28th September 2017. 3
  4. 4. So what does Kubernetes actually do ? One thing: Abstract away the underlying hardware. Abstract away the concept Node. Principle: Manage your applications like Cattle (generic, bulk operations) instead of like Pets (every operation is customized with care and love for the individual) You (the admin) declares the desired state, Kubernetes' main task is to make the desired state the actual state. 4
  5. 5. So what does Kubernetes actually do ? A system for container management in a clustered environment. Multiple cloud and bare-metal environments. Multiple container engines, mainly based on Docker. Provides grouping, load balancing, scaling and scheduling features. Manages applications, not machines 5
  6. 6. Kubernetes’ popularity KUBERNETES MESOS DOCKER SWARM CLOUD FOUNDRY OPENSTACK Google Search interest over time in the 1.10.2012-1.10.2017 timespan 6
  7. 7. Kubernetes general view 7
  8. 8. Master Components API Server: The main management endpoint for cluster (RESTful interface) Controller Manages: Handles replication management Scheduler Server: Assigns workload to specific nodes etcd: A distributed key-value store for sharing configuration 8
  9. 9. Node Components Docker: A container system which runs on a dedicated network Kubelet: Is responsible for the communication with master server Proxy: Used for network forwarding and load balancing 9
  10. 10. Work Units: POD 10 POD = A collocated group of containers (one-to-many) with shared resources. e.g. network, volumes. It can be viewed as a "logical host".
  11. 11. Work Units: LABELS and SELECTORS 11 LABELS and SELECTORS = Arbitrary metadata that represent identity for generic grouping mechanism - pods in a ReplicaSet - pods in a Service
  12. 12. Work Units: SERVICES 12 SERVICES = An interface to a group of containers, which acts as load-balancer and provides an abstraction layer - no need to worry about containers location. (+ External Services)
  13. 13. Work Units: REPLICA SET 13 REPLICA SET = Ensures that the number of desired pods "replicas" are running at any time.
  14. 14. Work Units: DEPLOYMENT 14 DEPLOYMENT = Declarative way to describe the desired state of the application (pods, replica sets).
  15. 15. Work Units: DAEMON SETS 15 DAEMON SETS = Way to run a Pod on every node?
  16. 16. Work Units: DAEMON SETS 16 CONFIG MAP and SECRET = Provides one interface to manage app configuration & secrets 12-factor says config comes from the environment
  17. 17. Work Units: DAEMON SETS 17 HORIZONTAL AUTO SCALER = Automatically scale pods as needed - based on CPU utilization (for now) - custom metrics in Alpha
  18. 18. Work Units: PERSISTENT VOLUME 18 PERSISTENT VOLUME = Manage storage with its own lifecycle. +20 supported driver plugins: - Google Persistent Disk - Amazon ESB - Ceph ...
  19. 19. Networking 19
  20. 20. Networking 20
  21. 21. Kubernetes general view 21
  22. 22. Kubernetes manifest example 22 apiVersion: v1 kind: Service metadata: name: web-frontend spec: selector: app: webapp role: frontend ports: - port: 80 targetPort: 80 apiVersion: apps/v1beta2 kind: Deployment metadata: labels: app: webapp role: frontend name: web-frontend spec: replicas: 3 template: metadata: labels: app: webapp role: frontend spec: containers: - image: nginx:1.13.1 name: nginx ports: - containerPort: 80 name: http
  23. 23. Kubernetes Dashboard 23
  24. 24. Monitoring 24
  25. 25. Logging 25
  26. 26. Continuous Deployment/Integration with Kubernetes 26
  27. 27. Cluster Deployment 27 Minikube: https://github.com/kubernetes/minikube Kubeadm: https://kubernetes.io/docs/setup/independent/create-cluster-kubeadm/ Kubespray: https://github.com/kubernetes-incubator/kubespray Kops (Kubernetes Operations): https://github.com/kubernetes/kops
  28. 28. Kops Use Case 28

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