Re: [Wrapper-user] Disable OOM killer for process?

[Adam R. <ad...@ex...>]

You could setup sudoers to allow you to exec just that as root or even use
setuid on your app that makes the changes
On 28 Sep 2015 04:20, "Casey Jordan" <cas...@jo...> wrote:

> Thanks Leif,
>
> So I the main thing I need to ensure is that this gets run as root, since
> the command I need to run will only be effective as root. It seems to me
> that the first method won't allow me to do that, since I will already be
> inside the JVM executing that code right?
>
> Will the event script method allow me to do this?
>
> Thanks!
>
>
>
> On Sun, Sep 27, 2015 at 9:11 PM Leif Mortenson <
> lei...@ta...> wrote:
>
>> Casey,
>> This would need to be done after the JVM is launched.
>> You can get the PID from within the JVM with WrapperManager.getJavaPID()
>> or by using the wrapper.java.pidfile property.
>>
>> But the easiest way to do this is to use the "jvm_start" event in the
>> Professional Edition to launch the required external command at the
>> appropriate time.
>> This can be setup as follows:
>> ---
>> wrapper.event.jvm_start.command.argv.1=/usr/bin/myscript
>> wrapper.event.jvm_start.command.argv.2=%WRAPPER_EVENT_JVM_PID%
>> ---
>> The following will help with debugging and understanding the timing of
>> various events:
>> ---
>> wrapper.event.default.loglevel=INFO
>> wrapper.event.jvm_start.command.loglevel=INFO
>> ---
>> Your "myscript" script would then handle the pid argument and run your
>> command.
>>
>> See the following for details:
>> http://wrapper.tanukisoftware.com/doc/english/props-event.html#command
>> http://wrapper.tanukisoftware.com/doc/english/props-envvars.html
>>
>> Cheers,
>> Leif
>>
>>
>>
>>
>>
>> On Mon, Sep 28, 2015 at 3:10 AM, Casey Jordan <cas...@jo...>
>> wrote:
>>
>>> Hi Dannes,
>>>
>>> Thanks for the input but I have already explored options not using
>>> overcommit, or turning off the OOM killer entirely and from what I can tell
>>> the best thing for me to do is tell the OOM killer not to kill eXist.
>>>
>>> So before I evaluate other options I really need to know how to add this
>>> functionality to the eXist startup.
>>>
>>> Thanks
>>>
>>>
>>> On Sun, Sep 27, 2015 at 1:58 PM Dannes Wessels <da...@ex...>
>>> wrote:
>>>
>>>> Hi,
>>>>
>>>> over committing memory sounds like a bad thing to do? You should make
>>>> sure anyway that the JVM will not be swapped out due to memory restrictions.
>>>>
>>>> regards
>>>>
>>>> Dannes
>>>>
>>>>
>>>> On Sun, Sep 27, 2015 at 12:32 AM, Casey Jordan <cas...@jo...
>>>> > wrote:
>>>>
>>>>> Hi all,
>>>>>
>>>>> We are having an issue where the out of memory killer is killing out
>>>>> process due to the out of the box overcommit memory settings on CentOS.
>>>>>
>>>>> After researching this quite a bit, I think the best thing to do is to
>>>>> tell the OOM killer to never kill the process, as described here:
>>>>> http://www.oracle.com/technetwork/articles/servers-storage-dev/oom-killer-1911807.html
>>>>>
>>>>> To do this, we need to execute the following command after startup:
>>>>>
>>>>> echo -17 > /proc/{pid}/oom_adj
>>>>>
>>>>>
>>>>> I was thinking this could be done as part of the *.sh script that gets
>>>>> executed via the java service wrapper, but I am not sure exactly how to do
>>>>> this (mainly where in this script I can put the valid logic). I am hoping
>>>>> someone might have done this before that could help.
>>>>>
>>>>> Thanks!
>>>>>
>>>>>
>>>>> ------------------------------------------------------------------------------
>>>>>
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>>>>>
>>>>>
>>>>
>>>>
>>>> --
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>>>>
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>>
>>
>> --
>> Leif Mortenson
>> President & CEO
>> Tanuki Software, Ltd.
>> 6-18-10-4F Nishi-Kasai, Edogawa-ku
>> Tokyo 134-0088 Japan
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