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问题

如何为Linux Guest VM生成崩溃转储文件

  • 2020年11月10日
  • 0答复
  • 300次观看
马兹
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  • 马兹 Nutanix员工
  • Nutanix员工
  • 12个答复

激活Linux Guest VM上的SYSRQ

  1. 登录到Linux Guest VM作为root用户，并如下检查“ SYSRQ”的值。

[root@linuxvm〜]＃cat/proc/sys/kernel/sysrq

16

默认值为16，代表“启用同步命令”。

  1. 将“ sysrq”的值从“ 16”修改为“ 1”。“ 1”是指“启用SYSRQ中的所有功能

根据情况，我们可以将此值设置为持久或非持久性

非持久

[root@linuxvm〜]＃echo“ 1”>/proc/sys/kernel/sysrq

永久 - 将需要重新启动才能应用更改

[root@linuxvm〜]＃echo“ kernel.sysrq = 1” >> /etc/sysctl.d/99-sysctl.conf
  1. 查看 ”sysrq”再次价值
[root@linuxvm〜]＃cat/proc/sys/kernel/sysrq

  1. 查找Linux VM正在运行的AHV主机

nutanix@cvm：〜$ acli vm.get  |GREP HOST_NAME

host_name：“ x.x.x.x”

  1. CVM从任何CVM中检查Linux Guest VM的UUID

nutanix@cvm：〜$ acli vm.list |grep 

LinuxVM 66551923-EB86-4C69-933B-ECF15EC5F59C

  1. 在下面的命令下运行，以在“步骤5”中确认了Grepping VM的UUID来找出Linux Guest VM的域ID。

root@ahv〜]＃virsh列表|GREP 66551923-EB86-4C69-933B-ECF15EC5F59C

104 66551923-EB86-4C69-933B-ECF15EC5F59C运行
  1. 在AHV主机上运行命令，以迫使Linux Guest VM Panic使用“步骤6”确认的域ID。
[root@ahv〜]＃virsh send-key 104 key_leftalt key_sysrq key_c
  1. 重新启动Linux Guest VM后，登录到VM，并检查“/var/crash”下的转储文件是否可用
[root@linuxvm〜]＃PWD

/var/崩溃
[root@linuxvm〜]＃ls -alt

127.0.0.1-2020-03-11-09：07：26
[root@linuxvm〜]＃CD 127.0.0.1-2020-03-11-09：07：26
[root@linuxvm〜]＃ls -alst

总计113832

0 drwxr-xr-x。2根44 3月11日09:07。

113044 -RW -------。1根115754458 3月11日09:07 VMCORE

788 -RW-R-R-R--。1根806202 3月11日09:07 vmcore-dmesg.txt

0 drwxr-xr-x。6根154 3月11日09:07 ..

下面的文档中提到了步骤：

Linux VM的崩溃转储文件


Activate sysrq on Linux guest VMs<\/span><\/p>
  1. \t

    Log in to the Linux Guest VM as root user and check the value of \"sysrq\" as below.<\/span><\/p>\t<\/li><\/ol>

    [root@linuxvm ~]# cat \/proc\/sys\/kernel\/sysrq

    16<\/code><\/pre>
    Default value is 16 which stands for \"enable sync command\".<\/span><\/p>
    1. \t
      Modify the value of \"sysrq\" from \"16\" to \"1\". \"1\" means \"Enable all functions in sysrq<\/span><\/p>\t<\/li><\/ol>
      We can set this value to be persistent or non-persistent depending on situation<\/span><\/p>
      Non\u00a0persistent\u00a0<\/span><\/p>
      [root@linuxvm ~]# echo \"1\" > \/proc\/sys\/kernel\/sysrq<\/code><\/pre>
      Permanent - Reboot will be required to apply the change<\/span><\/p>
      [root@linuxvm ~]# echo \"kernel.sysrq =1\" >> \/etc\/sysctl.d\/99-sysctl.conf<\/code><\/pre>
      1. Check \u201c<\/span>sysrq<\/em>\u201d value again<\/span><\/li><\/ol>
        [root@linuxvm ~]# cat \/proc\/sys\/kernel\/sysrq<\/code><\/pre>
        1. \t
          Find AHV host in which linux VM is running <\/span><\/p>\t<\/li><\/ol>
          nutanix@cvm:~$ acli vm.get <VM name> | grep host_name

          host_name: \"X.X.X.X\"<\/code><\/pre>
          1. \t
            CVM to check the UUID of Linux Guest VM from any CVM<\/span><\/p>\t<\/li><\/ol>
            nutanix@cvm:~$ acli vm.list | grep <VM name>

            linuxvm \u00a0 \u00a0 66551923-eb86-4c69-933b-ecf15ec5f59c<\/code><\/pre>
            1. \t
              run below command to find out the domain ID of the Linux Guest VM by grepping VM's UUID confirmed in \"Step 5\".<\/span><\/p>\t<\/li><\/ol>
              root@ahv ~]# virsh list | grep 66551923-eb86-4c69-933b-ecf15ec5f59c

              \u00a0104 \u00a0 66551923-eb86-4c69-933b-ecf15ec5f59c \u00a0 running<\/code><\/pre>
              1. Run command on AHV host to force panic the Linux Guest VM with the domain ID confirmed from \"Step 6\".<\/span><\/li><\/ol>
                [root@ahv ~]# virsh send-key 104 KEY_LEFTALT KEY_SYSRQ KEY_C<\/code><\/pre>
                1. Once reboot of the Linux Guest VM is completed, login to the VM and check if the dump files are available under \"\/var\/crash\"<\/span><\/li><\/ol>
                  [root@linuxvm ~]# pwd

                  \/var\/crash<\/code><\/pre>
                  [root@linuxvm ~]# ls -alt

                  127.0.0.1-2020-03-11-09:07:26<\/code><\/pre>
                  [root@linuxvm ~]# cd 127.0.0.1-2020-03-11-09:07:26<\/code><\/pre>
                  [root@linuxvm ~]# ls -alst

                  total 113832

                  0 drwxr-xr-x. 2 root root\u00a0 \u3000\u3000\u3000\u3000\u300044 Mar 11 09:07 .

                  113044\u00a0 -rw-------. \u00a0 1 root root \u00a0 115754458 Mar 11 09:07 vmcore

                  788 -rw-r--r--. \u00a0 1 root root\u00a0 \u00a0 \u3000\u3000806202 Mar 11 09:07 vmcore-dmesg.txt

                  0 drwxr-xr-x. 6 root root \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 154 Mar 11 09:07 ..<\/code><\/pre>
                  \u00a0<\/p>
                  Steps are mentioned in following document:<\/p>
                  crash dump file for linux VM<\/u><\/a><\/p>
                  \u00a0<\/p>

                  \u00a0<\/p>","quoteUsername":"maaz","translations":{"Common":{"like":"Like","unlike":"Unlike"},"Forum":{"Quote":"Quote","Share":"Share"}}}">
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