Linux
390 incident problems in Linux environments.
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How to split Linux failures by systemd, permission, and filesystem signalsAn InfraTree guide that lays out the first signals to check, the CLI verification order, common misdiagnoses, and a safe recovery path when a service fails but you need to isolate whether the cause is a systemd unit, permission, inode, mount, or process.Linux3 min readWhen sudo works in the shell but fails under automationAn InfraTree guide that lays out the first signals to check, the CLI verification order, common misdiagnoses, and a safe recovery path when only automation jobs fail because of TTY, sudoers, environment reset, or service user differences.Linux3 min readWhen permissions are fixed but only new directories are created with the wrong groupAn InfraTree guide that lays out the first signals to check, the CLI verification order, common misdiagnoses, and a safe recovery path when existing file permissions are correct but group inheritance breaks for newly created files and directories.Linux3 min read
Recommended problems
Reviewed problems first, then problems with detailed scenarios.
LINUX-1377A cron-triggered deploy script works manually and fails overnightA maintenance script is promoted to cron and later the scheduled run fails with a binary not found error no one can reproduce manually.ReviewedLinuxBeginner10 minFreeLINUX-1611A systemd service still failsA service still fails immediately after a package layout change.ReviewedLinuxBeginner6 minFreeLINUX-1625An sshd Match block is updated and one admin still misses accessOne admin still misses SSH access after a group rename.ReviewedLinuxBeginner7 minFreeSECURITY-1614A certificate is rotated and one client still rejects itOne client still rejects a rotated certificate.ReviewedSecurityBeginner7 minFree
All problems (390)
LINUX-1377A cron-triggered deploy script works manually and fails overnightA maintenance script is promoted to cron and later the scheduled run fails with a binary not found error no one can reproduce manually.ReviewedLinuxBeginner10 minFreeLINUX-1611A systemd service still failsA service still fails immediately after a package layout change.ReviewedLinuxBeginner6 minFreeSECURITY-1614A certificate is rotated and one client still rejects itOne client still rejects a rotated certificate.ReviewedSecurityBeginner7 minFreeLINUX-1625An sshd Match block is updated and one admin still misses accessOne admin still misses SSH access after a group rename.ReviewedLinuxBeginner7 minFreeLINUX-1787A logrotate file is valid and one log still growsA log still grows after logrotate cleanup.LinuxBeginner8 minFreeLINUX-1707A logrotate policy is valid and one file still growsA file still grows after logrotate was fixed.LinuxBeginner8 minFreeLINUX-1687A logrotate rule is valid and one file still growsA log file still grows after a logrotate cleanup.LinuxBeginner8 minFreeLINUX-1697A logrotate rule is valid and one file still growsA log file still grows after a logrotate cleanup.LinuxBeginner8 minFreeLINUX-1727A logrotate rule is valid and one file still growsA log file still grows after a cleanup.LinuxBeginner8 minFreeLINUX-1737A logrotate rule is valid and one file still growsA log file still grows after cleanup.LinuxBeginner8 minFreeLINUX-1747A logrotate rule is valid and one file still growsA log file still grows after cleanup.LinuxBeginner8 minFreeLINUX-1767A logrotate rule is valid and one file still growsA log file still grows after cleanup.LinuxBeginner8 minFreeLINUX-1777A logrotate rule is valid and one file still growsA log file still grows after cleanup.LinuxBeginner8 minFreeLINUX-1797A logrotate rule is valid and one file still growsA file still grows after logrotate cleanup.LinuxBeginner8 minFreeLINUX-1807A logrotate rule is valid and one file still growsA file still grows after logrotate cleanup.LinuxBeginner8 minFreeLINUX-1817A logrotate rule is valid and one file still growsA file still grows after logrotate cleanup.LinuxBeginner8 minFreeLINUX-1827A logrotate rule is valid and one file still growsA file still grows after logrotate cleanup.LinuxBeginner8 minFreeLINUX-1717A logrotate rule parses and one file still growsA log file still grows after a logrotate cleanup.LinuxBeginner8 minFreeLINUX-1756A timer is enabled and one task still never runsA timer still never runs even though it is enabled.LinuxBeginner8 minFreeLINUX-1706An fstab entry is correct and one mount still fails at bootA mount still fails at boot after the fstab entry was corrected.LinuxBeginner8 minFree