Case Studies¶

Incident narratives with symptoms, diagnostic questions, solutions, and self-grading.

95 case studies across 6 domains.

Cross Domain (20)¶

Study	Files
Alert Storm Flapping Healthchecks	symptoms · questions · grading
Ansible Ssh Agent Firewall	symptoms · questions · grading
Api Latency Bgp Route Leak Acl	symptoms · questions · grading
Backup Job Iscsi Vlan	symptoms · questions · grading
Canary Deploy Wrong Backend Ingress	symptoms · questions · grading
Ci Pipeline Docker Cache Registry	symptoms · questions · grading
Container Vuln Scanner False Positive	symptoms · questions · grading
Database Replication Lag Raid	symptoms · questions · grading
Deployment Stuck Imagepull Vault	symptoms · questions · grading
Disk Full Runaway Logs Loki	symptoms · questions · grading
Dns Tls Certmanager	symptoms · questions · grading
Grafana Empty Prometheus Networkpolicy	symptoms · questions · grading
Hpa Flapping Clock Skew Ntp	symptoms · questions · grading
Job Queue Cpu Throttle Cgroup	symptoms · questions · grading
Node Notready Nic Firmware Ansible	symptoms · questions · grading
Pod Oomkilled Sidecar Helm	symptoms · questions · grading
Service Mesh 503 Envoy Rbac	symptoms · questions · grading
Ssh Timeout Mtu Terraform	symptoms · questions · grading
Terraform State Lock Dynamodb	symptoms · questions · grading
User Auth Oidc Cert Kms	symptoms · questions · grading

Study	Files
Bios Settings Reset After Cmos	symptoms · questions · solution · grading
Bmc Clock Skew Cert Failure	symptoms · questions · solution · grading
Bonding Failover Not Working	symptoms · questions · solution · grading
Cable Management Wrong Port	symptoms · questions · solution · grading
Disk Full Root Services Down	symptoms · questions · solution · grading
Firmware Update Boot Loop	symptoms · questions · solution · grading
Hba Firmware Mismatch	symptoms · questions · solution · grading
Idrac Unreachable Os Up	symptoms · questions · solution · grading
Link Flaps Bad Optic	symptoms · questions · solution · grading
Memory Ecc Errors Increasing	symptoms · questions · solution · grading
Nvme Drive Disappeared	symptoms · questions · solution · grading
Os Install Fails Raid Controller	symptoms · questions · solution · grading
Power Supply Redundancy Lost	symptoms · questions · solution · grading
Pxe Boot Fails Uefi Mismatch	symptoms · questions · solution · grading
Rack Pdu Overload Alert	symptoms · questions · solution · grading
Raid Degraded Rebuild Latency	symptoms · questions · solution · grading
Serial Console Garbled	symptoms · questions · solution · grading
Server Intermittent Reboot	symptoms · questions · solution · grading
Server Remote Console Lag	symptoms · questions · solution · grading
Thermal Throttle Fan Failure	symptoms · questions · solution · grading

Study	Files
Cni Broken After Restart	symptoms · questions · solution · grading
Coredns Timeout Pod Dns	symptoms · questions · solution · grading
Crashloopbackoff No Logs	symptoms · questions · solution · grading
Daemonset Blocks Eviction	symptoms · questions · solution · grading
Drain Blocked By Pdb	symptoms · questions · solution · grading
Imagepullbackoff Registry Auth	symptoms · questions · solution · grading
Node Pressure Evictions	symptoms · questions · solution · grading
Persistent Volume Stuck Terminating	symptoms · questions · solution · grading
Resource Quota Blocking Deploy	symptoms · questions · solution · grading
Service No Endpoints	symptoms · questions · solution · grading

Study	Files
Inode Exhaustion	symptoms · questions · solution · grading
Iptables Blocking Unexpected	symptoms · questions · solution · grading
Kernel Soft Lockup	symptoms · questions · solution · grading
Oom Killer Events	symptoms · questions · solution · grading
Runaway Logs Fill Disk	symptoms · questions · solution · grading
Selinux Denying Service	symptoms · questions · solution · grading
Stuck Nfs Mount	symptoms · questions · solution · grading
Systemd Service Flapping	symptoms · questions · solution · grading
Time Sync Skew Breaks App	symptoms · questions · solution · grading
Zombie Processes Accumulating	symptoms · questions · solution · grading

Study	Files
Arp Flux Duplicate Ip	symptoms · questions · solution · grading
Asymmetric Routing One Direction	symptoms · questions · solution · grading
Bgp Peer Flapping	symptoms · questions · solution · grading
Dhcp Relay Broken	symptoms · questions · solution · grading
Dns Resolution Slow	symptoms · questions · solution · grading
Dns Split Horizon Confusion	symptoms · questions · solution · grading
Duplex Mismatch Symptoms	symptoms · questions · solution · grading
Firewall Shadow Rule	symptoms · questions · solution · grading
Jumbo Frames Partial	symptoms · questions · solution · grading
Lacp Mismatch One Link Hot	symptoms · questions · solution · grading
Mtu Blackhole Tls Stalls	symptoms · questions · solution · grading
Multicast Not Crossing Router	symptoms · questions · solution · grading
Nat Exhaustion Intermittent	symptoms · questions · solution · grading
Network Loop Broadcast Storm	symptoms · questions · solution · grading
Ospf Stuck In Exstart	symptoms · questions · solution · grading
Proxy Arp Causing Issues	symptoms · questions · solution · grading
Source Routing Policy Miss	symptoms · questions · solution · grading
Ssl Cert Chain Incomplete	symptoms · questions · solution · grading
Tcp Rst After Idle	symptoms · questions · solution · grading
Vlan Trunk Mistag	symptoms · questions · solution · grading