MTU stands for Maximum Transmission Unit. It is a networking term that refers to the largest size of a data packet that can be transmitted in a particular network protocol. The MTU size is important because it determines the maximum size of the data packets that can be transmitted over…

ClusterMesh, a solution of multi-cluster from Cilium, can provides a bunch of benefits for cross-cluster communications or networking traffics, such as: 1. Pod IP routing across multiple Kubernetes clusters at native performance via tunneling or direct-routing without requiring any gateways or proxies. 2. Transparent service discovery with standard Kubernetes services…

CNI (Container Network Interface) is a fundamental framework for configuring and managing network resources and connectivities of containers, used by container runtimes. There are a bunch of CNI implementations used by Kubernetes and Cilium is one of them with popular usage. Why Cilium CNI? We are using AWS EKS clusters which have the…

AWS Elastic Kubernetes Service (EKS) does not support Kubernetes Network Policy with its VPC CNI plugin. Therefore, there are a bunch of options to for EKS to support Network Policy. Antrea is one of them I explored and tested in one of my EKS clusters. The most attractive point of…

Egress traffic is outbound network connections or requests from Pods in the Kubernetes cluster. By default, a Pod can send requests to any other Pods, even have access to internet. Though, it might have security concerns. …

Datadog is very popular in use for system observation and supports various data sources, like metrics, logs. This is much helpful for IT operations, security, and development teams to monitor their systems from different angles. In order to collect metrics of AWS resources into Datadog, an integration of Datadog and…

ZooKeeper, as a centralized service, is quite useful for providing synchronization and maintaining naming and configuration data for distributed systems. Therefore, it could be a critical dependency for other services which rely on its services.

Builder is one of creational design patterns which builds a complex object from a simple one using a step-by-step approach. In Java, builder pattern is so popular that you might see it and use it everyday. …

K3s is a lightweight Kubernetes distribution which is great for Edge, IoT, CI, ARM, etc, so it is quite useful when building a local integration environment for an application mostly for testing purpose. My previous post introduced detailed steps to setup an integration environment with K3s and docker-compose, which is…