A systems administrator is troubleshooting a critical Linux server that has experienced a kernel panic. Upon connecting to the server's console, the administrator notes the system is halted and displays a panic message. To perform a detailed post-mortem analysis of the system's state precisely at the moment of the crash, the administrator needs to analyze a memory dump. Which of the following utilities should be configured beforehand to save a complete memory image when a kernel panic occurs?
The correct answer is kdump. kdump is a kernel crash dumping mechanism that captures the system's memory state (a vmcore or crash dump) in the event of a kernel panic. It works by booting into a secondary, smaller kernel (a capture kernel) which then saves the memory image of the crashed kernel to a file for later analysis with tools like crash. dmesg is used to view the kernel ring buffer, which contains kernel messages. While it may show the panic message, it does not capture the entire memory state for detailed analysis. journalctl is used to query the systemd journal. Similar to dmesg, it provides access to logged messages but is not the tool that captures the memory dump itself. rsyslog is a service for processing and forwarding log messages, not for creating crash dumps.
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CompTIA Linux+ XK0-006 (V8)
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