Kernel Panic

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Time
21 hours 25 minutes
Difficulty
Intermediate
CEU/CPE
21
Video Transcription
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>> Hello, cybrarians and welcome back to
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the Linux+ course here at Cybrary.
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I'm your instructor, Rob Goelz.
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In today's lesson, we'll be discussing kernel panic.
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Upon completion of the lesson,
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you'll be able to understand what a kernel panic is
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>> and describe the utilities that are used to handle one.
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>> A kernel panic is essentially a preventative measure,
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and this is what happens
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>> when the kernel detects an issue,
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>> and it does so in order to prevent
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>> any kind of loss or corruption of the system itself.
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>> Some common causes of a kernel panic
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can include some configuration issues,
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you can have problems with
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the applications running on your system,
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you might have a hardware failure,
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or you might have driver issues,
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a buggy driver can sometimes
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>> cause a kernel panic to occur
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>> if it accesses some memory
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>> it's not supposed to be using.
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>> The kernel panic and kernel uses the kdump utility,
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and that's used to save the crash dump in memory.
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Now, that requires that you have some system memory
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>> setup or reserved for storing that information,
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>> and that's configured in GRUB using crashkernel.
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Crashkernel is used to setup and reserve
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a certain amount of system memory
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>> to write the output of a kernel panic
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>> so that it can be used to determine
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>> what exactly happened when the kernel panic occurred.
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>> The kexec utility is used by the kdump
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>> to boot into a second kernel when the system crashes.
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>> This is where you can interactively get in
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>> and see what's happening.
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>> It preserves the system state
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>> and you can analyze the crash dump
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>> using the crash command.
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>> In today's lesson, we covered kernel panic
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>> and the tools and utilities involved in a kernel panic
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>> and to troubleshoot a kernel panic.
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Thank you so much for being here,
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>> and I look forward to seeing you in the next lesson.
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