Introdução ao Kubernetes

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Palestra ministrada na semana da computação da Uniara em Araraquara-SP. Uma breve introdução ao Kubernetes utilizando o minikube.

Tecnologia

Gerenciando seu
cluster com Kubernetes
Uma introdução…

Sobre mim…
• Fazendo gambiarra com java
desde 2009…
• Formado pela Fatec-TQ e MBA
em Eng. de Softare pela FIAP-
SP
• Líder técnico de alguns times na
s2it
• Sempre pesquisando e
discutindo sobre engenharia de
software…
• Jogando algo quando sobra
tempo : )

!@#$Cluster!@#$
!@#$Container!@#$ 
!@#Kubernetes!@#
Cluster
Container 
Kubernetes

Por que
containers ?
• Run anywhere

• Ambiente consistente

• Ocupa menos espaço

• Isolamento

• Kubernetes ou k8s (κυβερνήτης, em
grego signiﬁca “piloto”)

• Orquestrador de containers

• Suporte a multiplas soluções de cloud e
“bare-metal”.

• Inspirado e baseado nas experiências
do google e de seus sistemas internos

• Plataforma para automatizar entregas,
escalabilidade e operações de
aplicações espalhadas em mais de um
host
O que é Kubernetes
“Gerencia aplicações, não máquinas”

• Derivado do projeto BORG

• Opensource

• Escrito em GO

• Arquitetura cliente-servidor

• API utilizando json de fácil
integração
O que é Kubernetes
“Gerencia aplicações, não máquinas”

• Pods

• Deployments

• Services

• ReplicaSets

• Ingress

• etc…
Recursos

• Menor unidade de recursos
do k8s

• Criado pelo cliente e
alocado nos hosts

• Geralmente é criado em
função de outros recursos
Pods

• Utilizado para garantir que
sempre um determinado
numero de pods estejam
rodando

• Quando criado, leva a
criação de N pods, de
acordo com o especiﬁcado
ReplicaSet

• Cria ReplicaSets e Pods de
acordo com o especiﬁcado

• Torna os recursos criados
gerenciáveis pelo cluster
Deployments

• É a abstração de um serviço
de software

• Possui uma porta local onde
o proxy deve escutar

• Através dos labels,
determina quais pods vão
responder para uma
solicitação nesse serviço
Service

• Conﬁguração de um
DaemonSet

• Faz com que esse daemon
execute em todos os nodes
do container.
DaemonSet

• Coleção de regras para
trafego de entrada

• Permite que os serviços
internos sejam expostos ao
mundo exterior

• Consegue deﬁnir dominios
para serviços e aplicações
distintas
Ingress

Demo
https://github.com/omegamendes/api-go-hostname.git

Referências
• https://www.docker.com/what-container

• https://super.abril.com.br/tecnologia/como-cai-um-aviao/

• https://www.aprendacloud.com.br/containers-docker-vms/

• https://medium.com/@anilktalla/why-container-virtualization-abb8bfc04048

• https://qconsp.com/system/ﬁles/presentation-slides/estendendo_o_kubernetes_-
_ricardo_katz.pdf

• https://kubernetes.io/docs/concepts/services-networking/ingress/

• https://github.com/nginxinc/kubernetes-ingress/tree/master/examples

• https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.10/#ingresslist-v1beta1-
extensions

• https://github.com/omegamendes/api-go-hostname.git

Valeu !
Twitter @omegamendes_

Github /omegamendes

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