RHCSA
862 incident response problems that help with RHCSA prep.
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All problems (862)
LINUX-1357A package reinstall restores the binary and SELinux still blocks executionA recovery action reinstalls a package and later the service still fails even though the required binary now exists again.LinuxIntermediate12 minProLINUX-1335A root filesystem cleanup frees space and journald still refuses new logsAfter an inode or disk pressure incident, system logs partly recover but one class of user service logs never returns.LinuxIntermediate12 minProLINUX-1381A rootless Podman service survives package updates and failsA rootless Podman service survives package updates and fails focuses on Runner Hygiene and asks the reader to isolate the key signal in Linux. Rootless runtimes depend on user service policy as much as on package installation.LinuxIntermediate12 minProLINUX-1359A scheduled rsnapshot run works manually and fails on timerA remote backup job works on manual retry and fails consistently during boot-triggered or scheduled runs.LinuxIntermediate12 minProLINUX-1355A sudo rule works locally and fails through a bastionA host update passes basic tests and later operators notice sudo MFA behaves differently only when entering through a jump host.LinuxIntermediate12 minProLINUX-1365A sudoers include works for direct users and fails for bastion usersA host update passes basic access tests and later operators discover that bastion-based sudo no longer enforces MFA consistently.LinuxIntermediate12 minProLINUX-1369A systemd mount waits on network-online.target and still failsA remote filesystem works after manual retry and fails consistently on boot or timer-triggered execution.LinuxIntermediate12 minProLINUX-1361A systemd path unit stopped triggering after a deployment model switched from in-place writes to symlink swaps for the current release pointerThe watched path still changes logically, yet no event fires because the release tool now updates a symlink target instead of modifying the file directly.LinuxIntermediate12 minProLINUX-1371A systemd PathUnit never triggers after a blue-green releaseA deployment hook relies on a PathUnit to reload a service and later one release lands without any of the expected follow-up actions.LinuxIntermediate12 minProLINUX-1341A systemd service works by hand and fails on bootA systemd service works by hand and fails on boot focuses on cluster-maintenance and asks the reader to isolate the key signal in Linux. Systemd may need files to exist before the process ever starts, not only by the time the command runs.LinuxIntermediate12 minProLINUX-1373An apt hardening migration looks complete and old packages still come from an...An apt hardening migration looks complete and old packages still come from... focuses on runtime-configuration and asks the reader to isolate the key signal in ubuntu. A correct signed-by migration can still be undermined by one forgotten sour...LinuxIntermediate12 minProLINUX-1363An Ubuntu apt migration adds signed-by cleanly and one host still failsA repository trust migration is rolled out and later one host class keeps failing apt update despite the new signed-by config being present.LinuxIntermediate12 minProLINUX-1345An Ubuntu cloud image keeps restoring the wrong routeA network incident is repaired interactively and the host reverts to the old broken route after reboot or reprovision events.LinuxIntermediate12 minProLINUX-1325sudo stops honoring one permissionA host hardening change adds a new sudoers.d file and later one operational command begins prompting or denying unexpectedly.LinuxIntermediate12 minProLINUX-1337A backup mount works (mount-started-before-network-backed-cryptsetup-unlock)A backup mount works (the key signal) focuses on service-health-gates and asks the reader to isolate the key signal in Linux. Boot-time storage readiness depends on the unlock path, not just on the f...LinuxIntermediate13 minProLINUX-1303A database health check goes green before transactions are actually accepted, so dependent services migrate against a server that is still replaying recovery statePort checks pass, yet migrations fail because the real readiness condition trails behind the simplistic health command.LinuxIntermediate13 minProLINUX-1353A logrotate policy runs successfully and a long-running uploader loses chunksA logrotate policy runs successfully and a long-running uploader loses chunks focuses on incident-response and asks the reader to isolate the key signal in Linux. A clean logrotate run does not prove the application tolerated the rotation semantics.LinuxIntermediate13 minProLINUX-1331A netplan change looks valid and the host still boots without networkA refreshed Ubuntu image is rolled out and only new instances lose network while the same config works on existing hosts.LinuxIntermediate13 minProLINUX-1308A sudo command works interactively and fails in a systemd serviceA maintenance script works for an operator shell and later fails only when run from a service timer or oneshot unit.LinuxIntermediate13 minProLINUX-1347A sudo MFA rule works for direct users and fails for SSH jump usersA sudo MFA rule works for direct users and fails for SSH jump users focuses on Identity And Access and asks the reader to isolate the key signal in Linux. Authentication bugs after updates often come from include-order drift, not missing modu...LinuxIntermediate13 minPro