February 2026
Intermediate to advanced
372 pages
9h 38m
Portuguese (Portugal, Brazil)
Content preview from Cilium: Em funcionamento (Portuguese Edition)
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Capítulo 10. Acessoao cluster
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Acessar aplicativos dentro de um cluster Kubernetes a partir do mundo externo é uma necessidade comum. Um cliente externo, seja ele o laptop de um usuário, um roteador upstream ou outro aplicativo, precisa de uma maneira estável de acessar um serviço dentro do cluster.
No Capítulo 7, apresentamos o suporte do Cilium para o Kubernetes Ingress e a API Gateway como mecanismos para equilibrar a carga e manipular o tráfego assim que ele chega ao cluster. No entanto, ainda não explicamos como os clientes externos ficam sabendo do endereço IP externo do cluster. Esse é o foco deste capítulo.
A opção mais direta oferecida pelo Kubernetes é um serviço do tipo NodePort. Com um serviço NodePort, o Kubernetes abre o mesmo número de porta em todos os nós do cluster e encaminha o tráfego dessa porta para os pods de back-end do serviço. Isso funciona sem configuração adicional e é frequentemente usado em clusters simples, nos quais os clientes conhecem diretamente os IPs dos nós.
O NodePort introduz duas camadas de seleção. Na primeira camada, o cliente escolhe qual nó contatar. Na segunda camada, o nó que recebe o tráfego o encaminha para um dos pods backend saudáveis, conforme explicado no Capítulo 6. A segunda camada funciona de maneira consistente porque o Kubernetes rastreia a integridade do pod e remove os backends com falha. A primeira ...
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