https://www.cnblogs.com/gaoyuechen/p/8595183.html

https://www.cnblogs.com/poiqwe/archive/2012/12/19/2824731.html

https://blog.csdn.net/weixin_35910783/article/details/116609447

[root@scaqan03dv0101 crashfiles]# echo “c”>/proc/sysrq-trigger

kdump的配置文件
/etc/kdump.conf
修改該配置文件之后需要重啟kdump service
systemctl restart kdump.service
查看kdump service是否正常
[root@scaqan03dv0201 crashfiles]# systemctl status kdump.service
● kdump.service - Crash recovery kernel armingLoaded: loaded (/usr/lib/systemd/system/kdump.service; enabled; vendor preset: enabled)Active: active (exited) since Fri 2022-01-28 21:54:15 CST; 1min 8s agoProcess: 53221 ExecStop=/usr/bin/kdumpctl stop (code=exited, status=0/SUCCESS)Process: 53271 ExecStart=/usr/bin/kdumpctl start (code=exited, status=0/SUCCESS)Main PID: 53271 (code=exited, status=0/SUCCESS)Jan 28 21:53:46 scaqan03dv0201 systemd[1]: Starting Crash recovery kernel arming...
Jan 28 21:53:46 scaqan03dv0201 kdumpctl[53271]: Detected change(s) in the following file(s):
Jan 28 21:53:46 scaqan03dv0201 kdumpctl[53271]: /etc/kdump.conf
Jan 28 21:53:46 scaqan03dv0201 kdumpctl[53271]: Rebuilding /boot/initramfs-4.14.35-2047.508.3.3.el7uek.x86_64kdump.img
Jan 28 21:54:15 scaqan03dv0201 kdumpctl[53271]: kexec: loaded kdump kernel
Jan 28 21:54:15 scaqan03dv0201 kdumpctl[53271]: Starting kdump: [OK]<=== 這里表示kdump是處于正常狀態
Jan 28 21:54:15 scaqan03dv0201 systemd[1]: Started Crash recovery kernel arming.測試kdump是否正常工作[root@scaqan03dv0101 crashfiles]#  echo "c">/proc/sysrq-triggerecho "c" >> /proc/sysrq-trigger
echo c>>/proc/sysrq-trigger我發現追加模式echo "c" >> /proc/sysrq-trigger   會重啟機器，但是有時候不會生成coredump

crash命令是用來對kdump產生的vmcore進行分析的命令
如果沒有的需要安裝，可以通過yum或者從網上找一個rpm包來安裝

[root@scaqan03dv0201 ~]# rpm -ivh ./crash-7.2.3-11.el7.x86_64.rpm
warning: ./crash-7.2.3-11.el7.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID f4a80eb5: NOKEY
Preparing...                          ################################# [100%]
Updating / installing...1:crash-7.2.3-11.el7               ################################# [100%]

需要安裝另外兩個kernel debug rpm來對kdump生成的vmcore進行分析

根據你自己的kernel版本來選擇下載

[root@scaqan03dv0201 bin]# uname -a
Linux scaqan03dv0201 4.14.35-2047.508.3.3.el7uek.x86_64 #2 SMP Wed Nov 10 13:27:37 PST 2021 x86_64 x86_64 x86_64 GNU/Linux[root@scaqan03dv0201 ~]# rpm -ivh kernel-uek-debuginfo-4.14.35-2047.508.3.3.el7uek.x86_64.rpm kernel-uek-debuginfo-common-4.14.35-2047.508.3.3.el7uek.x86_64.rpm

進入到包含vmcore文件的目錄，對這個vmcore進行分析

[root@scaqan03dv0201 127.0.0.1-2022-01-29-10:27:21]# ls
vmcore  vmcore-dmesg.txt
[root@scaqan03dv0201 127.0.0.1-2022-01-29-10:27:21]# crash /usr/lib/debug/lib/modules/4.14.35-2047.508.3.3.el7uek.x86_64/vmlinux vmcore

總結

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