Q: What is a DaemonSet and when do you use it?
A DaemonSet ensures one pod runs on every node (or a subset of nodes). When a new node joins the cluster, the DaemonSet automatically pla...
#Kubernetes #Deployments & Workloads #L1 #Container Orchestration #K8s #Prometheus
🎙️ Candidate Opening & Architectural Context
""In our production Kubernetes clusters running microservices on EKS/AKS, this was a classic operational challenge. When addressing this question, I walk the interviewer through our production incident runbook: isolating the blast radius, checking diagnostic logs and metrics, and applying a safe fix.""
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🛠️ Production Runbook & Step-by-Step Resolution
1️⃣
Initial Diagnostics & Root Cause Analysis
A DaemonSet ensures one pod runs on every node (or a subset of nodes). When a new node joins the cluster, the DaemonSet automatically places a pod on it.
- Log collectors (Fluentd, Filebeat) — need to run on every node to collect logs.
- Monitoring agents (Prometheus node-exporter) — need node-level metrics from every node.
- Network plugins (Calico, Weave) — need to run on every node.
2️⃣
Remediation & Permanent Safeguards
Use cases:
- Security agents (Falco, Wazuh) — need to watch every node.
💡 The Senior SRE Gold Nugget (Key Architectural Takeaway)
"Pro-Tip: Log collectors (Fluentd, Filebeat) — need to run on every node to collect logs.."
⚡ 60-Second Elevator Pitch Talking Points
- Log collectors (Fluentd, Filebeat) — need to run on every node to collect logs.
- Monitoring agents (Prometheus node-exporter) — need node-level metrics from every node.
- Network plugins (Calico, Weave) — need to run on every node.
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