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A sudden spike in traffic from a misconfigured client or a DDoS attack can fill your kernel’s connection tracking table. When nf_conntrack hits its ma...
You have a lightweight container meant to run a periodic cleanup script or report generator. You baked cron into the Dockerfile, installed the service...
You are trying to debug a container that crashes immediately upon startup or behaves erratically, but you cannot simply exec into it because the entry...
A sysadmin incident that is easy to miss is “the app died, but the disk was fine.” The service exits with signal SIGKILL, journalctl shows Killed proc...
A common, confusing incident: a service starts writing millions of tiny files — build cache, email queue, session files, Prometheus WAL chunks, or tem...
You’re trying to deploy via a bastion host using ssh -A user@bastion, but the connection to the target server fails with Permission denied (publickey)...
You push a one-line code change to your CI/CD pipeline, but the build takes 15 minutes because Docker is re-downloading base images and re-executing h...
You’re staring at a production incident where your application is timing out on write operations to a local syslog socket. The kernel log buffer is fu...
It’s 2 AM, and your CI/CD pipeline is timing out. The CPU looks fine, memory is stable, but the build agents are freezing. You suspect the disk, but d...
You’re on-call when a production node stops responding to SSH and health checks fail, but the machine isn’t dead—the CPU is still at 100%, yet no proc...