CentOS - Mar 2019 - How to specify kernel version when restart kdump

kdump operates by booting a fresh kernel to capture the context of a 
crashed kernel, and so the only way for kdump to dump a kernel is to 
crash it and cause kdump to invoke its post-crash kernel.

You can manually force a running kernel to panic (and invoke a 
correctly-configured kdump) with the following command sequence:
>     echo 1 > /proc/sys/kernel/sysrq
>     echo c > /proc/sysrq-trigger
Cheers,
Ben


On 3/25/19 7:19 PM, wuzhouhui wrote:
> Hi,
> 
> Is there a way to specify kernel version when (re)start kdump
> service? Suppose I have install a new kernel and kdump will
> generate kdump.img for new kernel in next boot. But I want kdump
> to generate kdump.img for new kernel immediately, is it possible?
> 
> Thanks.
> _______________________________________________
> CentOS mailing list
> CentOS at centos.org
> https://lists.centos.org/mailman/listinfo/centos
> 
-- 

Benjamin Hauger
SysAdmin/CSDC-DMO
Rm. 94
x8371

> -----Original Messages-----
> From: "Benjamin Hauger" <hauger at noao.edu>
> Sent Time: 2019-03-27 00:15:21 (Wednesday)
> To: centos at centos.org
> Cc: 
> Subject: Re: [CentOS] How to specify kernel version when restart kdump
> 
> kdump operates by booting a fresh kernel to capture the context of a 
> crashed kernel, and so the only way for kdump to dump a kernel is to 
> crash it and cause kdump to invoke its post-crash kernel.
> 
> You can manually force a running kernel to panic (and invoke a 
> correctly-configured kdump) with the following command sequence:
> 
> >     echo 1 > /proc/sys/kernel/sysrq
> >     echo c > /proc/sysrq-trigger
> 
> Cheers,
> Ben
Hi, Ben

I think your response doesn't answered my question. I'm not asking
how to trigger kernel crash and see whether the kdump is works, but
asking how to specifying kernel version when start kdump service.

Thanks.
> 
> 
> On 3/25/19 7:19 PM, wuzhouhui wrote:
> CentOS at centos.org
> https://lists.centos.org/mailman/listinfo/centos

What do you mean? Wouldn't the kernel version always be the actual 
running version of the kernel that was booted?

Ben

On 3/26/19 6:16 PM, wuzhouhui wrote:
>> -----Original Messages-----
>> From: "Benjamin Hauger" <hauger at noao.edu>
>> Sent Time: 2019-03-27 00:15:21 (Wednesday)
>> To: centos at centos.org
>> Cc:
>> Subject: Re: [CentOS] How to specify kernel version when restart kdump
>>
>> kdump operates by booting a fresh kernel to capture the context of a
>> crashed kernel, and so the only way for kdump to dump a kernel is to
>> crash it and cause kdump to invoke its post-crash kernel.
>>
>> You can manually force a running kernel to panic (and invoke a
>> correctly-configured kdump) with the following command sequence:
>>
>>>      echo 1 > /proc/sys/kernel/sysrq
>>>      echo c > /proc/sysrq-trigger
>>
>> Cheers,
>> Ben
> Hi, Ben
> 
> I think your response doesn't answered my question. I'm not asking
> how to trigger kernel crash and see whether the kdump is works, but
> asking how to specifying kernel version when start kdump service.
> 
> Thanks.
>>
>>
>> On 3/25/19 7:19 PM, wuzhouhui wrote:
>> CentOS at centos.org
>> https://lists.centos.org/mailman/listinfo/centos
> _______________________________________________
> CentOS mailing list
> CentOS at centos.org
> https://lists.centos.org/mailman/listinfo/centos
> 
-- 

Benjamin Hauger
SysAdmin/CSDC-DMO
Rm. 94
x8371