RHCSA
862 incident response problems that help with RHCSA prep.
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All problems (862)
LINUX-1487An mdadm reshape resumes after reboot and write performance collapsesThroughput craters after a reboot in the middle of an array reshape even though the array reports healthy.LinuxAdvanced12 minProLINUX-1479An mdadm resync slows to a crawlA RAID rebuild takes dramatically longer after a previously tested spare is reintroduced.LinuxAdvanced12 minProLINUX-1510An MFA rollout validates and one bastion still skips promptsA single bastion host skips MFA after a fleet-wide PAM rollout.LinuxAdvanced12 minProLINUX-1520An MFA rollout validates and one bastion still skips promptsA single bastion skips MFA after the fleet-wide rollout.LinuxAdvanced12 minProLINUX-1484An NFS mount remounts cleanly and one app still sees stale handlesA remounted NFS path still throws stale file handle errors only for processes that survived the maintenance window.LinuxAdvanced12 minProLINUX-1472An nftables migration preserves rules and still opens one pathA host hardening migration succeeds until reboot, when one subnet regains access unexpectedly.LinuxAdvanced12 minProLINUX-1498An nftables policy is loaded and one host still accepts old flowsA host continues allowing traffic that should be blocked immediately after a firewalld zone refactor.LinuxAdvanced12 minProLINUX-1508An nftables policy loads and old flows still passTraffic that should be blocked still passes immediately after a firewalld zone refactor.LinuxAdvanced12 minProLINUX-1462An nftables ruleset loads and one subnet stays openA hardened host remains reachable from one subnet after the ruleset is split into multiple include files.LinuxAdvanced12 minProLINUX-1467An rsyslog queue recovers after disk pressure and still skips one hostCentral logging comes back after cleanup, yet one host has a missing incident window.LinuxAdvanced12 minProLINUX-1428SSH certificate auth fails (authorizedprincipalscommand-returned-utf16-encoded-output)SSH certificate auth fails (authorizedprincipalscommand-returned-utf16... focuses on Identity And Access and asks the reader to isolate the key signal in ubuntu. Invisible encoding differences can break SSH auth flows that otherwise l...LinuxAdvanced12 minProLINUX-1438SSH certificate auth fails (authorizedprincipalscommand-returned-utf16-principal-list)SSH certificate auth fails (authorizedprincipalscommand-returned-utf16... focuses on Identity And Access and asks the reader to isolate the key signal in ubuntu. Invisible encoding changes can break SSH auth despite human-readable log...LinuxAdvanced12 minProLINUX-1418SSH certificate login fails only (authorizedprincipalscommand-returned-bom-prefixed-output)SSH certificate login fails only (authorizedprincipalscommand-returned-bom... focuses on Identity And Access and asks the reader to isolate the key signal in ubuntu. Invisible encoding bytes can break SSH auth decisions even when logs...LinuxAdvanced12 minProLINUX-1388A bastion host enforces SSH certificates and one host rejects all valid...A bastion host enforces SSH certificates and one host rejects all valid... focuses on Identity And Access and asks the reader to isolate the key signal in Linux. Time-step issues can masquerade as certificate or CA failures in SSH certif...LinuxAdvanced13 minProLINUX-1446A journald cursor survives rotation and shipping still duplicatesDuplicate or missing logs appear after journald storage is moved to a new filesystem.LinuxAdvanced13 minProLINUX-1426A journald forwarder drops logs (sandbox-profile-blocked-new-journal-cursor-location)A journald forwarder drops logs (sandbox-profile-blocked-new-journal-cursor... focuses on Observability Pipeline and asks the reader to isolate the key signal in redhat. Logging restart issues often come from cursor persistence paths drifti...LinuxAdvanced13 minProLINUX-1436A journald forwarder drops or replays logsA journald forwarder drops or replays logs focuses on Observability Pipeline and asks the reader to isolate the key signal in redhat. Restart-time logging anomalies often come from cursor restore problems, not from throughput limits.LinuxAdvanced13 minProLINUX-1396A journald remote forwarder remains active and drops burstsA journald remote forwarder remains active and drops bursts focuses on incident-response and asks the reader to isolate the key signal in Linux. Package splits can move config authority between units while leaving the main service name...LinuxAdvanced13 minProLINUX-1406A journald-to-remote forwarder ignores a new rate-limit overrideLog forwarding becomes bursty after an upgrade even though the team added a documented rate-limit drop-in.LinuxAdvanced13 minProLINUX-1416A journald-to-rsyslog bridge drops bursts (sandboxing-profile-blocked-imjournal-cursor-path-restore)A journald-to-rsyslog bridge drops bursts (sandboxing-profile-blocked... focuses on Observability Pipeline and asks the reader to isolate the key signal in redhat. Restart-time logging gaps often come from cursor restore failures rathe...LinuxAdvanced13 minPro