No capítulo anterior, “ ”, vimos como o Cilium distribui endereços IP para os pods. Agora que cada pod tem um IP, o próximo passo é entender como o tráfego flui entre eles. É aí que entra o caminho de dados do Cilium: o conjunto de tecnologias que o Cilium usa para processar, rotear e encaminhar pacotes dentro de um cluster Kubernetes.
Neste capítulo, vamos examinar como os pacotes são entregues dentro e entre os nós, como funcionam os diferentes modelos de roteamento e como os protocolos de encapsulamento, como VXLAN e Geneve, entram em ação quando o roteamento nativo não é possível. Você pode encontrar todos os manifestos YAML que usará neste capítulo no diretório chapter05 do repositório GitHub do livro.
Começaremos com o caso mais simples (intranode, para comunicação entre pods no mesmo nó), depois passaremos para o tráfego internode (conectividade entre pods localizados em nós diferentes) e as diferenças entre os modos nativo e overlay (Figura 5-1).
Figura 5-1. Comunicaçãointranode versus internode
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