RHCSA
862 incident response problems that help with RHCSA prep.
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All problems (862)
LINUX-1835An SSH Match rule is updated and one admin still failsAn admin still fails after the SSH Match update.LinuxBeginner7 minFreeLINUX-1845An SSH Match rule is updated and one admin still failsAn admin still fails after the SSH Match update.LinuxBeginner7 minFreeLINUX-1855An SSH Match rule is updated and one admin still failsAn admin still fails after the SSH Match update.LinuxBeginner7 minFreeLINUX-1875An SSH Match rule is updated and one admin still failsAn admin still fails after the SSH Match update.LinuxBeginner7 minFreeLINUX-1695An SSH Match rule is updated and one admin still fails loginAn admin still cannot log in after a group rename.LinuxBeginner7 minFreeLINUX-1725An SSH Match rule is updated and one admin still fails loginAn admin still cannot log in after a group rename.LinuxBeginner7 minFreeLINUX-1735An SSH Match rule is updated and one admin still fails loginAn admin still cannot log in after a Match rule update.LinuxBeginner7 minFreeLINUX-1745An SSH Match rule is updated and one admin still fails loginAn admin still cannot log in after a Match rule update.LinuxBeginner7 minFreeLINUX-1765An SSH Match rule is updated and one admin still fails loginAn admin still cannot log in after a Match rule update.LinuxBeginner7 minFreeLINUX-1775An SSH Match rule is updated and one admin still fails loginAn admin still cannot log in after a Match rule update.LinuxBeginner7 minFreeLINUX-1635An SSH Match rule is updated and one admin still misses accessOne admin still misses SSH access after a group rename.LinuxBeginner7 minFreeLINUX-1655An SSH Match rule is updated and one admin still misses accessOne admin still misses SSH access after a group rename.LinuxBeginner7 minFreeLINUX-1665An SSH Match rule is updated and one admin still misses accessOne admin still misses SSH access after a group rename.LinuxBeginner7 minFreeLINUX-481A sudo rule allows the target subcommand (Permission Denied)A sudo rule allows the target subcommand (Permission Denied) focuses on linux-identity-and-access and asks the reader to isolate Permission Denied. 실무에서는 linux-identity-and-access 문제를 볼 때 서비스 로그만 보지 말고 inode, 파일시스템 여유, 포트 점유, systemd 상태, 최근 패키지 변경까지 같이 확인해야 원인을 빨리 좁힐 수 있습니다.ReviewedLinuxIntermediate17 minProLINUX-015After a jemalloc config change, memory is stable but CPU spikesAfter a jemalloc config change, memory is stable but CPU spikes is a hands-on troubleshooting drill. Analyzes a situation where changing the allocator to optimize memory instead increases CPU cost. Linux Service Operations needs to be checked by narrowing scope, recent change,...LinuxAdvanced27 minProLINUX-018The kernel log is quiet, but a NIC driver reset briefly drops connectionsA situation where there is little trace in the application log but a brief connection drop happens at the lower driver level.LinuxAdvanced28 minProLINUX-019A short journalctl retention policy means logs are already gone right after an incidentA short journalctl retention policy means logs are already gone right is a hands-on troubleshooting drill. A situation where a log-retention setting trimmed to cut operating cost conversely makes incident analysis harder. Linux Service Operations needs to be checked by narrowi...LinuxIntermediate18 minProLINUX-013A ulimit setting applied to the shell but not reflected in the systemd serviceA ulimit setting applied to the shell but not reflected in the systemd service is a hands-on troubleshooting drill. A situation where manual testing is fine but the actual service process hits a file-descriptor shortage. Linux Service Operations needs to be checked by narrowin...LinuxAdvanced24 minProLINUX-120A kernel livepatch package loads successfully but the target symbol version mismatch means the host remains vulnerableThe livepatch service reports success, yet the running kernel never actually applies the fix because the binary compatibility window was missed.LinuxAdvanced17 minProLINUX-100Filesystem is remounted read-only after transient storage errors but the app hides it as generic 500sThe application logs are noisy, yet the real cause is the kernel remounting the filesystem read-only after I/O faults the app never surfaces clearly.LinuxAdvanced18 minPro