RHCSA
862 incident response problems that help with RHCSA prep.
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All problems (862)
LINUX-1191Rsync deploy succeeds but leaves stale filesA public rsync deployment pattern is reused after a repo layout change. The sync completes, but old files from the previous layout still shadow the new release.LinuxIntermediate18 minProLINUX-1201Rsync dry-run looked safe but the real run removed filesA community rsync recipe was validated with dry-run output. In production, one path resolved differently and the cleanup removed files operators assumed were protected.LinuxIntermediate18 minProLINUX-529A 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.LinuxIntermediate19 minProLINUX-494A log rotation policy is correct (Resource Exhaustion)A log rotation policy is correct (Resource Exhaustion) focuses on linux-performance-and-observability and asks the reader to isolate Resource Exhaustion. 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...LinuxIntermediate19 minProLINUX-1203File cleanup frees disk on the host but the container still sees no spacePublic cleanup advice frees obvious log files on the host. The application inside the container still sees no space because runtime overlay storage is the real bottleneck.LinuxIntermediate19 minProLINUX-1193Logrotate runs but the application never reopens files and disk pressure returns immediatelyRotation completes successfully, yet space pressure persists because the process never receives or handles the reopen signal needed to release old log files.LinuxIntermediate19 minProLINUX-1198Memory pressure looks like a leak but the real growth is page cache from one hot file pathSystem memory usage rises steadily, yet the real pressure comes from aggressive page cache growth rather than the application heap itself.LinuxIntermediate19 minProLINUX-554A log rotation policy is correct (Resource Exhaustion)A log rotation policy is correct (Resource Exhaustion) focuses on linux-performance-and-observability and asks the reader to isolate Resource Exhaustion. 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...LinuxIntermediate20 minProLINUX-611A log rotation policy is correct (Resource Exhaustion)A log rotation policy is correct (Resource Exhaustion) focuses on linux-performance-and-observability and asks the reader to isolate Resource Exhaustion. 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...LinuxIntermediate20 minProLINUX-1189Journald grows unexpectedlyA host logging policy was hardened after reading public guidance, but container streams now arrive through two separate ingestion paths.LinuxIntermediate20 minProLINUX-1182Bind-mounted app directory flips ownership after containerized deployment runs as rootA Linux host starts serving permission denied errors because a containerized deployment step rewrites ownership on the bind-mounted directory.LinuxIntermediate21 minProLINUX-829A 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.LinuxIntermediate24 minProLINUX-1008A 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.LinuxIntermediate28 minProLINUX-1630A locale archive is updated and one service still renders old textOne service still renders old locale output after an update.LinuxIntermediate10 minProLINUX-1620A package upgrade succeeds and one daemon still loads the old libraryOne daemon still loads an old library after package upgrade.LinuxIntermediate10 minProLINUX-1690A runtime directory is correct after manual repair and still comes back wrong after rebootA service works after manual repair and breaks again after reboot because the runtime path changes ownership.LinuxIntermediate11 minProLINUX-1678A runtime directory is correct during the day and comes back owned by root after rebootA service works until reboot, then its runtime directory comes back with the wrong owner.LinuxIntermediate11 minProLINUX-1760A runtime directory is fixed and still revertsA runtime directory still reverts after the manual fix.LinuxIntermediate11 minProLINUX-1700A runtime directory is repaired and still comes back wrongA service works after manual repair and fails again after reboot because the runtime directory ownership changes.LinuxIntermediate11 minProLINUX-1790A runtime directory is repaired and still flips backA runtime directory flips back after manual repair.LinuxIntermediate11 minPro