RHCSA
862 incident response problems that help with RHCSA prep.
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All problems (862)
LINUX-145An LVM cache pool masks a failing SSD, and writeback mode keeps acknowledging writes until the cache metadata finally goes read-onlyStorage looks fast and healthy right up to the point where recovery becomes much harder because the failure mode was buffered.LinuxAdvanced18 minProLINUX-131An LVM device filter excludes the restored path after multipath renaming and the volume group appears incomplete on one boot pathThe disks exist, but discovery logic now ignores them because the path naming contract changed.LinuxAdvanced18 minProLINUX-138An mdadm bitmap keeps recovery fast on paper, but a write-mostly member slows resync so much that the array never catches up under loadThe storage survives, yet the degraded state lingers because one tuning decision and one hardware profile conflict.LinuxAdvanced18 minProLINUX-234An NFS mount survives boot while stale file handles explode after an export swap on the server side during a failover rehearsalThe mount path exists and the underlying file identity contract changed underneath it. Normal traffic masked the issue until the standby or alternate path became active under rehearsal conditions.LinuxAdvanced18 minProLINUX-117An SELinux boolean is enabled but the domain still cannot transition to the target type the app needsThe operator toggles the obvious control, yet access stays blocked because the denial depends on a type transition rule not covered by the boolean.LinuxAdvanced18 minProLINUX-318An SELinux boolean is enabled while a later package update reloads a policy module that still denies the exact type transition the app needs during a failover rehearsalThe expected switch is on, yet the effective policy path still blocks the workflow. Normal traffic masked the issue until the standby or alternate path became active under rehearsal conditions.LinuxAdvanced18 minProLINUX-264An SSSD cache stays warm while the identity provider rotates usernames with a new realm suffix during a failover rehearsalAuthentication works in one place and the cached identity model remains anchored to the old directory naming contract. Normal traffic masked the issue until the standby or alternate path became active under rehearsal conditions.LinuxAdvanced18 minProLINUX-210Crash dumps remain enabled while the reserved crash kernel memory no longer matches the current kernel footprint during a failover rehearsalThe host thinks it is protected while the dump path quietly truncates or fails. Normal traffic masked the issue until the standby or alternate path became active under rehearsal conditions.LinuxAdvanced18 minProLINUX-1217Journald rate limiting hides the real crash patternA failing service emits repeated error bursts and the operator can no longer reconstruct the true sequence from host logs alone.LinuxAdvanced18 minProLINUX-1185Log cleanup does not reclaim spaceAn operator follows a common cleanup answer and removes oversized logs. The disk remains full because the application never reopened its file handles.LinuxIntermediate18 minProLINUX-109mdadm assembles the array degradedThe new disk is present, but boot recovery chooses the wrong component set because stale metadata still claims to belong to the array.LinuxAdvanced18 minProLINUX-216Policy routing marks the outbound packets correctly while rp_filter still rejects the asymmetric return path during a failover rehearsalForwarding is valid in one direction and kernel anti-spoofing defeats the other. Normal traffic masked the issue until the standby or alternate path became active under rehearsal conditions.LinuxAdvanced18 minProLINUX-111rsyslog disk-assisted forwarding queue fills the spool partition and local logging blocks behind remote delivery pressureRemote forwarding is supposed to be resilient, yet local observability degrades because the spillover queue shares space with critical system paths.LinuxAdvanced18 minProLINUX-1206Rsyslog duplicates an eventA service moves under systemd and alert volume doubles even though the application still writes one line.LinuxAdvanced18 minProLINUX-1222Systemd unit sees the right variables but still launches the wrong binaryA command runs the right binary manually but starts an older or different binary when systemd launches it.LinuxAdvanced18 minProLINUX-1227The host reboots cleanly after patching but one service still runs old codeA rollout should have replaced a service binary, but behavior remains unchanged until a much later full restart.LinuxAdvanced18 minProLINUX-174The right initramfs was built while firmware still boots an older entry pointing elsewhere during a failover rehearsalRecovery artifacts exist and the machine never actually loads them. Normal traffic masked the issue until the standby or alternate path became active under rehearsal conditions.LinuxAdvanced18 minProLINUX-104XFS project quota is enabled but a subdirectory inherits the wrong project ID and one tenant can overrun its limitQuota appears configured on the filesystem, yet nested paths escape the intended control because the directory tree was not fully assigned.LinuxAdvanced18 minProLINUX-294A dracut image includes the storage driver while an older UEFI entry still points at a kernel that lacks the matching userspace module set during a failover rehearsalEarly boot pieces are individually present and not aligned as one bootable pair. Normal traffic masked the issue until the standby or alternate path became active under rehearsal conditions.LinuxAdvanced19 minProLINUX-1232A reboot clears the symptom once, then it returnsA temporary boot fix works until the next config regeneration or package update rewrites the original parameters back.LinuxAdvanced19 minPro