En el capítulo anterior, « », exploramos cómo Cilium asigna direcciones IP a los pods. Ahora que cada pod tiene asignada una IP, el siguiente paso lógico es comprender cómo fluye el tráfico entre ellos. Esta es la función de la ruta de datos de Cilium: el conjunto de tecnologías que Cilium utiliza para procesar, enrutar y reenviar paquetes dentro de un clúster de Kubernetes.
En este capítulo, examinaremos cómo se entregan los paquetes tanto dentro como entre nodos, cómo funcionan los diferentes modelos de enrutamiento y cómo entran en juego los protocolos de encapsulación como VXLAN y Geneve cuando no es posible el enrutamiento nativo. Puedes encontrar todos los manifiestos YAML que utilizarás en este capítulo en el directorio chapter05 del repositorio GitHub del libro.
Comenzaremos con el caso más sencillo (intranodo, para la comunicación entre pods en el mismo nodo), luego pasaremos al tráfico entre nodos (conectividad entre pods ubicados en diferentes nodos) y las diferencias entre los modos nativo y superpuesto (Figura 5-1).
Figura 5-1. Comunicaciónintranodo frente a internodo
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