RHCSA
862 incident response problems that help with RHCSA prep.
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All problems (862)
LINUX-1188Pinned package mirror stays reachable but serves stale repository metadataAutomated patching fails because the pinned mirror never disappeared, yet its package metadata has aged out or fallen behind the expected release state.LinuxAdvanced22 minProLINUX-025Socket backlog tuning hides application accept bottleneckKernel queue settings were increased, but the service still stalls because the application cannot drain connections fast enough.LinuxIntermediate22 minProLINUX-810An application writes Unicode filenames correctlyAn application writes Unicode filenames correctly focuses on linux-performance-and-observability and asks the reader to isolate Rollout Stuck. 실무에서는 linux-performance-and-observability 문제를 볼 때 서비스 로그만 보지 말고 inode, 파일시스템 여유, 포트 점유, systemd 상태, 최근 패키지 변경까지 같이 확인해야 원인을 빨리 좁힐 수 있습니다.LinuxIntermediate23 minProLINUX-073mdadm auto-assembly picks the wrong member order after an initramfs still references stale metadataThe disks are present, but recovery stays risky because the boot environment is assembling the array from outdated metadata assumptions.LinuxAdvanced23 minProLINUX-1184Root partition fillsPublic rsync advice was used to simplify deployment. Large artifact refreshes now double write pressure on the root filesystem.LinuxAdvanced23 minProLINUX-039NFS client hits stale file handle after the export path movedPermissions and network reachability look fine, yet file operations fail because the server-side export changed under a still-mounted client path.LinuxAdvanced24 minProLINUX-1194NFS mount recovers slowlyA shared NFS export appears mostly healthy after maintenance. Only one path prefix fails, leading teams to suspect app bugs instead of partial mount-state recovery.LinuxAdvanced25 minProLINUX-1190NFS-backed service hangsA Linux service stores one write path on NFS after following public tuning advice. Later, a degraded mount leaves app threads stuck and progress stops.LinuxAdvanced27 minProLINUX-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-1175A restored permission model looks right (Permission Denied)A restored permission model looks right (Permission Denied) focuses on Linux Storage and Filesystems and asks the reader to isolate Permission Denied. 실무에서는 Linux Storage and Filesystems 문제를 볼 때 서비스 로그만 보지 말고 inode, 파일시스템 여유, 포트 점유, systemd 상태, 최근 패키지 변경까지 같이 확인해야 원인을 빨리 좁힐 수...LinuxAdvanced29 minProLINUX-1170An application writes Unicode filenames correctlyAn application writes Unicode filenames correctly focuses on linux-performance-and-observability and asks the reader to isolate Rollout Stuck. 실무에서는 linux-performance-and-observability 문제를 볼 때 서비스 로그만 보지 말고 inode, 파일시스템 여유, 포트 점유, systemd 상태, 최근 패키지 변경까지 같이 확인해야 원인을 빨리 좁힐 수 있습니다.LinuxIntermediate29 minProLINUX-1594A chrony source file is fixed and one VM still driftsOne VM still drifts after a chrony source file fix.LinuxIntermediate7 minProLINUX-1574A chrony source reorder is correct and one VM still driftsOne VM still drifts after chrony source reorder and reload.LinuxIntermediate7 minProLINUX-1584A chrony template is corrected and one node still steps timeOne node still steps time after a chrony template correction.LinuxIntermediate7 minProLINUX-1608A DNF repo cleanup is correct and one node still upgrades the wrong streamOne node still upgrades the wrong stream after DNF repo cleanup.LinuxIntermediate7 minProLINUX-1564A chrony pool is fixed and one VM still skewsOne VM drifts again only after DHCP renew.LinuxIntermediate8 minProLINUX-1588A DNF mirror fix lands and one host still sees the old metalinkOne host still sees the old metalink after a DNF mirror fix.LinuxIntermediate8 minProLINUX-1598A DNF mirror update succeeds and one host still sees old metadataOne host still sees old metadata after a DNF mirror update.LinuxIntermediate8 minProLINUX-1578A DNF stream switch succeeds and one host still resolves old packagesOne host still resolves packages from the old stream after a switch.LinuxIntermediate8 minProLINUX-1605A logrotate script is fixed and one archive still doublesOne log archive still duplicates after a logrotate fix.LinuxIntermediate8 minPro