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ulimit设置
# ulimit -c 输出 0 表示没有开启 输出 unlimited 表示开启//将这个加到 /etc/profile 或者 /etc/rc.d/rc.local 中# ulimit -c unlimited修改启动项
[root@localhost ~]# cat /etc/default/grub GRUB_TIMEOUT=5GRUB_DISTRIBUTOR="$(sed "s, release .*$,,g" /etc/system-release)"GRUB_DEFAULT=0GRUB_DISABLE_SUBMENU=trueGRUB_TERMINAL_OUTPUT="console"GRUB_CMDLINE_LINUX="crashkernel=512M rd.lvm.lv=zstack/root rd.lvm.lv=zstack/swap rhgb quiet intel_iommu=on modprobe.blacklist=snd_hda_intel,amd76x_edac,vga16fb,nouveau,rivafb,nvidiafb,rivatv,amdgpu,radeon" //修改或添加crashkernel=512MGRUB_DISABLE_RECOVERY="true"更新配置
# grub2-mkconfig -o /boot/grub2/grub.cfg//重启# reboot查看 kdump 服务是否启动
[root@localhost ~]# systemctl status kdump● kdump.service - Crash recovery kernel arming Loaded: loaded (/usr/lib/systemd/system/kdump.service; enabled; vendor preset: enabled) Active: active (exited) since Mon 2020-09-28 14:32:42 CST; 2min 39s ago Process: 2676 ExecStart=/usr/bin/kdumpctl start (code=exited, status=0/SUCCESS) Main PID: 2676 (code=exited, status=0/SUCCESS) Tasks: 0 CGroup: /system.slice/kdump.serviceSep 28 14:32:42 localhost dracut[4873]: drwxr-xr-x 2 root root 0 Sep 28 14:32 usr/share/zoneinfo/AsiaSep 28 14:32:42 localhost dracut[4873]: -rw-r--r-- 1 root root 528 Jul 11 2019 usr/share/zoneinfo/Asia/ShanghaiSep 28 14:32:42 localhost dracut[4873]: drwxr-xr-x 2 root root 0 Sep 28 14:32 varSep 28 14:32:42 localhost dracut[4873]: lrwxrwxrwx 1 root root 11 Sep 28 14:32 var/lock -> ../run/lockSep 28 14:32:42 localhost dracut[4873]: lrwxrwxrwx 1 root root 6 Sep 28 14:32 var/run -> ../runSep 28 14:32:42 localhost dracut[4873]: ========================================================================Sep 28 14:32:42 localhost dracut[4873]: *** Creating initramfs image file "/boot/initramfs-5.8.10-1.el7.elrepo.x86_64kdump.img" done ***Sep 28 14:32:42 localhost kdumpctl[2676]: kexec: loaded kdump kernelSep 28 14:32:42 localhost kdumpctl[2676]: Starting kdump: [OK]Sep 28 14:32:42 localhost systemd[1]: Started Crash recovery kernel arming.手动模拟crash
#echo 1 > /proc/sys/kernel/sysrq #echo c > /proc/sysrq-trigger若出现core dump现象，查看文件夹
# ls /var/crash/以上是关于Linux内核开启kdump的主要内容，如果未能解决你的问题，请参考以下文章
