Hi, I'm Sungmin Ryou
I'm a software engineer who trembles at how fast AI is advancing, yet can't go back to a life without it. Half portfolio, half blog — this is where I keep notes on what I've studied and the projects I've built.
Read the posts below, or head to the About page to learn more about me!
Recent Posts
Checking resource usage with kubectl top, kubectl logs container selection, previous containers, and stdout/stderr, where log files live on the node, and comparing symptoms after breaking Service selectors, targetPort, readiness, CoreDNS, and NetworkPolicy one at a time.
A record of stopping the kubelet and containerd, deliberately breaking the kubelet config and static Pod manifests, then tracking down the cause with kubectl, systemctl, journalctl, crictl, and /var/log/pods on a kubeadm cluster.
The split of roles between GatewayClass, Gateway, and HTTPRoute, host/path/header matching and weighted splitting, allowedRoutes and ReferenceGrant for Routes and backends in other namespaces, and how it differs from Ingress, checked on a kubeadm cluster with NGINX Gateway Fabric and ingress-nginx installed.
The Kubernetes network model, Pod-to-Pod traffic across nodes, how kube-proxy turns Services into iptables rules, NodePort and LoadBalancer, editing the CoreDNS Corefile, and Pod dnsPolicy, checked hands-on on a kubeadm + Calico cluster.