Timeouts and Latency
184 incident problems that show up as “Timeouts and Latency”.
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All problems (184)
LINUX-003Tracking the upstream application bottleneck in an Nginx 502 incidentA troubleshooting exercise that comprehensively considers the proxy, ports, application state, and timeout settings.LinuxAdvanced28 minProLINUX-150A custom udev rule matches the old NIC naming scheme and no longer applies the MTU override after motherboard replacementNetwork behavior changed with hardware, but the automation still keys off the previous identity model.LinuxIntermediate15 minProLINUX-116A firewalld rich rule was added at runtime only and the maintenance reboot silently removes the allow pathThe fix works immediately, but the next restart recreates the outage because only the live firewall configuration was updated.LinuxIntermediate15 minProNETWORK-134A LACP bundle works until one side silently flips to passive during replacement and the port-channel collapses to a single linkMost traffic still passes, but capacity and redundancy disappear because only one side is actively negotiating now.NetworkIntermediate15 minProLINUX-130Checksum offload was disabled only at runtime, and after reboot the same packet corruption symptom returns with no config drift visibleThe fix appears mysterious because the network setting changed outside the persistent configuration model.LinuxIntermediate15 minProLINUX-148The shell history is redirected to a network share, and login latency spikes only when the filer fails over mid-sessionAuthentication is fine, but the interactive environment blocks on a remote dependency nobody modeled as critical.LinuxIntermediate15 minProLINUX-351A firewalld rich rule is correct while the packet actually arrives through a zone bound by a newly generated virtual interface profile during a staged decommissionThe rule exists, but not in the policy domain the traffic now uses. The service still works through the primary path, but one dependency only fails when the old component is finally drained away.LinuxIntermediate16 minProLINUX-136A firewalld zone is assigned through NetworkManager, but the new uplink profile inherits the default zone after interface replacementThe rule set exists, yet the replacement interface no longer lives in the same policy domain.LinuxIntermediate16 minProK8S-144A headless Service returns pod A records correctly, but one Java client caches the first answer forever and never balances after scale-outCluster DNS is accurate, yet one library's lookup behavior defeats the intended design.KubernetesIntermediate16 minProLINUX-107A tuned profile reapplies IRQ balancing after reboot and network latency returns on the database nodeManual tuning helped temporarily, but the performance regression comes back because the system profile manager writes its own preferred state at boot.LinuxIntermediate16 minProLINUX-204Interactive login depends on a remote home directory path that becomes the real bottleneck during a storage hesitation during a failover rehearsalAuthentication is valid while the shell environment blocks on network storage. Normal traffic masked the issue until the standby or alternate path became active under rehearsal conditions.LinuxIntermediate16 minProNETWORK-120IPv4 default routing is stable, but RA guard blocks new IPv6 gateway updates and dual-stack clients degrade graduallyConnectivity seems mostly fine until IPv6 freshness matters, because the edge no longer permits router advertisements from the intended gateway.NetworkIntermediate16 minProNETWORK-112NTP stratum looks valid but symmetric peer mode creates a timing loop across the switch stackEvery device claims a trustworthy source, yet the stack drifts because peers are feeding each other instead of a real upstream reference.NetworkIntermediate16 minProNETWORK-123Storm control on an uplink clamps ARP bursts during failover and clients intermittently lose gateway discoveryThe network remains mostly up, but protection tuning now interferes with a valid convergence burst.NetworkIntermediate16 minProLINUX-288A direct firewall fix survives until reboot while NetworkManager restores a different zone binding for the new uplink profile during a failover rehearsalThe rule exists and the interface moved to a different policy domain underneath it. Normal traffic masked the issue until the standby or alternate path became active under rehearsal conditions.LinuxIntermediate17 minProK8S-300A headless Service gives every pod address while the client library still randomizes from a stale cached subset after scale-down during a failover rehearsalService discovery is accurate and the client keeps dialing endpoints that no longer exist. Normal traffic masked the issue until the standby or alternate path became active under rehearsal conditions.KubernetesIntermediate17 minProK8S-180Cluster DNS is correct while one client runtime caches the first answer indefinitely during a failover rehearsalThe service discovery layer updates and the consuming library behaves as if nothing changed. Normal traffic masked the issue until the standby or alternate path became active under rehearsal conditions.KubernetesIntermediate17 minProK8S-142The service mesh sidecar starts after the application, and the startup probe passes once before all outbound traffic begins failingInitialization timing hid the networking dependency because the first health check ran before the sidecar took control.KubernetesIntermediate17 minProLINUX-469A firewalld rich rule is correct (Timeouts and Latency)A firewalld rich rule is correct (Timeouts and Latency) focuses on linux-network-and-firewall and asks the reader to isolate Timeouts and Latency. 실무에서는 linux-network-and-firewall 문제를 볼 때 서비스 로그만 보지 말고 inode, 파일시스템 여유, 포트 점유, systemd 상태, 최근 패키지 변경까지 같이 확인해야 원인을 빨리 좁힐 수 있습니다.LinuxIntermediate18 minProK8S-168A sidecar takes over networking after the application already passed its first startup probe during a failover rehearsalHealth looks good once, but the final runtime path is not the one the probe validated. Normal traffic masked the issue until the standby or alternate path became active under rehearsal conditions.KubernetesIntermediate18 minPro