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69 lines
2.0 KiB
69 lines
2.0 KiB
.TH KDUMPCTL 8 2015-07-13 kexec-tools |
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.SH NAME |
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kdumpctl \- control interface for kdump |
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.SH SYNOPSIS |
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.B kdumpctl |
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.I COMMAND |
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.SH DESCRIPTION |
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.B kdumpctl |
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is used to check or control the kdump service. |
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In most cases, you should use |
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.B systemctl |
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to start / stop / enable kdump service instead. However, |
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.B kdumpctl |
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provides more details for debug and a helper to setup ssh key authentication. |
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.SH COMMANDS |
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.TP |
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.I start |
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Start the service. |
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.TP |
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.I stop |
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Stop the service. |
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.TP |
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.I status |
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Prints the current status of kdump service. |
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It returns non-zero value if kdump is not operational. |
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.TP |
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.I restart |
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Is equal to |
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.I start; stop |
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.TP |
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.I reload |
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reload crash kernel image and initramfs without triggering a rebuild. |
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.TP |
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.I rebuild |
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rebuild the crash kernel initramfs. |
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.TP |
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.I propagate |
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Helps to setup key authentication for ssh storage since it's |
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impossible to use password authentication during kdump. |
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.TP |
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.I showmem |
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Prints the size of reserved memory for crash kernel in megabytes. |
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.TP |
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.I estimate |
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Estimate a suitable crashkernel value for current machine. This is a |
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best-effort estimate. It will print a recommanded crashkernel value |
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based on current kdump setup, and list some details of memory usage. |
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.TP |
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.I reset-crashkernel [--kernel=path_to_kernel] [--reboot] |
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Reset crashkernel to default value recommended by kexec-tools. If no kernel |
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is specified, will reset KDUMP_KERNELVER if it's defined in /etc/sysconfig/kdump |
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or current running kernel's crashkernel value if KDUMP_KERNELVER is empty. You can |
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also specify --kernel=ALL and --kernel=DEFAULT which have the same meaning as |
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grubby's kernel-path=ALL and kernel-path=DEFAULT. ppc64le supports FADump and |
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supports an additonal [--fadump=[on|off|nocma]] parameter to toggle FADump |
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on/off. |
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Note: The memory requirements for kdump varies heavily depending on the |
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used hardware and system configuration. Thus the recommended |
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crashkernel might not work for your specific setup. Please test if |
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kdump works after resetting the crashkernel value. |
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.SH "SEE ALSO" |
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.BR kdump.conf (5), |
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.BR mkdumprd (8)
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