Linux内核开启kdump

Posted 2021-10-05 li_Jiejun

Index of /7/x86_64

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=5
GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
GRUB_DEFAULT=0
GRUB_DISABLE_SUBMENU=true
GRUB_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=512M
GRUB_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.service

Sep 28 14:32:42 localhost dracut[4873]: drwxr-xr-x   2 root     root            0 Sep 28 14:32 usr/share/zoneinfo/Asia
Sep 28 14:32:42 localhost dracut[4873]: -rw-r--r--   1 root     root          528 Jul 11  2019 usr/share/zoneinfo/Asia/Shanghai
Sep 28 14:32:42 localhost dracut[4873]: drwxr-xr-x   2 root     root            0 Sep 28 14:32 var
Sep 28 14:32:42 localhost dracut[4873]: lrwxrwxrwx   1 root     root           11 Sep 28 14:32 var/lock -> ../run/lock
Sep 28 14:32:42 localhost dracut[4873]: lrwxrwxrwx   1 root     root            6 Sep 28 14:32 var/run -> ../run
Sep 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 kernel
Sep 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/