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When migrating a small application to new infrastructure using Consul for service discovery, the goal is to achieve zero downtime by leveraging health checks to steer traffic. In this architecture, the Consul DNS interface is used to resolve healthy service instances. A potential conflict arises when a service instance is marked as critical . While the Consu
In a k3os environment, CoreDNS operates as a system-wide addon managed by the kube-controller. When deploying on edge nodes with specific upstream DNS providers, resolution often fails because the node's resolv.conf conflicts with the CoreDNS configuration in the k3s manifest. Furthermore, because k3os utilizes a read-only root filesystem by default, injecti
consul