Phase 4 / 11 · Trips 41–56

Linux Processes, Networking, and Troubleshooting

Understand the operating-system concepts that directly affect containerized applications.

Walkthroughs planned

Before this phase: Bash Scripting and Automation — checkpoint

1. Trip 41Need to inspect running processesUse ps, top, and pgrep →
   Learning goal·Not yet practiced
2. Trip 42Need to stop a processUse kill and understand signals →
   Learning goal·Not yet practiced
3. Trip 43Need to understand background executionUse &, jobs, fg, and bg →
   Learning goal·Not yet practiced
4. Trip 44Need to inspect memory and CPUUse free, uptime, and process tools →
   Learning goal·Not yet practiced
5. Trip 45Need to inspect disk usageUse df and du →
   Learning goal·Not yet practiced
6. Trip 46Need to understand Linux servicesInspect systemd services with systemctl →
   Learning goal·Not yet practiced
7. Trip 47Need to inspect system logsUse journalctl →
   Learning goal·Not yet practiced
8. Trip 48Need to inspect network interfacesUse ip addr and ip route →
   Learning goal·Not yet practiced
9. Trip 49Need to troubleshoot DNSUse dig and getent hosts →
   Learning goal·Not yet practiced
10. Trip 50Need to test HTTP endpointsUse curl with headers and status codes →
    Learning goal·Not yet practiced
11. Trip 51Need to inspect listening portsUse ss →
    Learning goal·Not yet practiced
12. Trip 52Need to test TCP connectivityUse nc →
    Learning goal·Not yet practiced
13. Trip 53Need to understand TLS connectionsInspect certificates using openssl s_client →
    Learning goal·Not yet practiced
14. Trip 54Need to understand process isolationExplore Linux namespaces →
    Learning goal·Not yet practiced
15. Trip 55Need to understand resource isolationExplore cgroups →
    Learning goal·Not yet practiced
16. Trip 56Need to understand application shutdownHandle SIGTERM and graceful termination →
    Learning goal·Not yet practiced