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Posted to users@tomcat.apache.org by Anil Ambati <aa...@us.ibm.com> on 2014/11/04 20:58:05 UTC
PID file locked on Windows 2008 system
Hi,
We have a requirement to read the PID file created by the Tomcat server
process on Windows, but we are not able to using RandomAccessFile or
FileInputStream because the file seems to be locked by the Tomcat process.
Why does the Tomcat server keep the PID file locked, preventing other
processes to even read the file? Is there a work around or solution for
this problem?
Any help is appreciated. Thank you in advance.
Regards,
Regards,
Anilkumar Ambati
4205 S Miami Blvd
WebSphere Virtual Enterprise Development
Durham, 27703-9141
Phone:
+1-919-254-6152
USA
Mobile:
+1-919-434-5674
e-mail:
aambati@us.ibm.com
"You have no responsibility to live up to what other people think you
ought to accomplish." -Richard Feynman (1918-1988)
Re: PID file locked on Windows 2008 system
Posted by Christopher Schultz <ch...@christopherschultz.net>.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
Anil,
On 11/4/14 6:27 PM, Anil Ambati wrote:
> Thanks for the response. How can I ask procrun folks about the
> options? Is there another news group? Sorry , I am new to Tomcat.
Yes, you'll want to post to the commons users mailing list:
http://commons.apache.org/proper/commons-daemon/mail-lists.html
Please be aware that Apache commons is ... crowded. If you post to the
list, please put "[daemon]" in the subject line to get some attention.
Otherwise, you'll not cut through all the messages about mathematical
solvers, parsers, file compression utilities and all the other things
that have been dumped into commons over the years.
We'd be interested in hearing the result of the discussion, so please
post back here if/when you get an answer and/or resolution.
- -chris
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Re: PID file locked on Windows 2008 system
Posted by Anil Ambati <aa...@us.ibm.com>.
Hi Chris,
Thanks for the response. How can I ask procrun folks about the options? Is
there another news group? Sorry , I am new to Tomcat.
Regards,
Anilkumar Ambati
4205 S Miami Blvd
WebSphere Virtual Enterprise Development
Durham, 27703-9141
Phone:
+1-919-254-6152
USA
Mobile:
+1-919-434-5674
e-mail:
aambati@us.ibm.com
"You have no responsibility to live up to what other people think you
ought to accomplish." -Richard Feynman (1918-1988)
From:
Christopher Schultz <ch...@christopherschultz.net>
To:
Tomcat Users List <us...@tomcat.apache.org>,
Date:
11/04/2014 05:39 PM
Subject:
Re: PID file locked on Windows 2008 system
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
Anil,
On 11/4/14 5:25 PM, Christopher Schultz wrote:
> Anil,
>
> On 11/4/14 2:58 PM, Anil Ambati wrote:
>> We have a requirement to read the PID file created by the Tomcat
>> server process on Windows, but we are not able to using
>> RandomAccessFile or FileInputStream because the file seems to be
>> locked by the Tomcat process.
>
>
>> Why does the Tomcat server keep the PID file locked, preventing
>> other processes to even read the file? Is there a work around or
>> solution for this problem?
>
> You must be using commons-daemon's procrun, otherwise known as the
> Windows service wrapper. That process creates (and possibly locks)
> the PID file for Tomcat.
>
> You may find users here who know the answer to your question, but
> you might have better luck posting to the commons mailing list to
> ask there.
>
> I suspect it's something silly like holding-open the PID file
> instead of writing to it and then closing it.
I took a quick look, and it looks like the PID file is being created
with a file option FILE_FLAG_DELETE_ON_CLOSE which causes the OS to
delete the file off the disk when all file handles are closed. So,
closing the file handle will result in the PID file being deleted.
This option was added because the PID file wasn't being removed if the
service crashed, which kept the service from restarting (oops).
https://issues.apache.org/jira/browse/DAEMON-183
It seems like an option to control what happens on startup when the
PID file already exists would be a good idea. You'll have to ask the
procrun folks about what the options are. It seems reasonable to be
able to read the PID file, since not being able to read it makes it
kind of useless other than as a lock-file (i.e. its contents are
irrelevant).
- -chris
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Re: PID file locked on Windows 2008 system
Posted by Christopher Schultz <ch...@christopherschultz.net>.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
Anil,
On 11/4/14 5:25 PM, Christopher Schultz wrote:
> Anil,
>
> On 11/4/14 2:58 PM, Anil Ambati wrote:
>> We have a requirement to read the PID file created by the Tomcat
>> server process on Windows, but we are not able to using
>> RandomAccessFile or FileInputStream because the file seems to be
>> locked by the Tomcat process.
>
>
>> Why does the Tomcat server keep the PID file locked, preventing
>> other processes to even read the file? Is there a work around or
>> solution for this problem?
>
> You must be using commons-daemon's procrun, otherwise known as the
> Windows service wrapper. That process creates (and possibly locks)
> the PID file for Tomcat.
>
> You may find users here who know the answer to your question, but
> you might have better luck posting to the commons mailing list to
> ask there.
>
> I suspect it's something silly like holding-open the PID file
> instead of writing to it and then closing it.
I took a quick look, and it looks like the PID file is being created
with a file option FILE_FLAG_DELETE_ON_CLOSE which causes the OS to
delete the file off the disk when all file handles are closed. So,
closing the file handle will result in the PID file being deleted.
This option was added because the PID file wasn't being removed if the
service crashed, which kept the service from restarting (oops).
https://issues.apache.org/jira/browse/DAEMON-183
It seems like an option to control what happens on startup when the
PID file already exists would be a good idea. You'll have to ask the
procrun folks about what the options are. It seems reasonable to be
able to read the PID file, since not being able to read it makes it
kind of useless other than as a lock-file (i.e. its contents are
irrelevant).
- -chris
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Re: PID file locked on Windows 2008 system
Posted by Christopher Schultz <ch...@christopherschultz.net>.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
David,
On 11/4/14 5:54 PM, David kerber wrote:
> On 11/4/2014 5:25 PM, Christopher Schultz wrote: Anil,
>
> On 11/4/14 2:58 PM, Anil Ambati wrote:
>>>> We have a requirement to read the PID file created by the
>>>> Tomcat server process on Windows, but we are not able to
>>>> using RandomAccessFile or FileInputStream because the file
>>>> seems to be locked by the Tomcat process.
>>>>
>>>>
>>>> Why does the Tomcat server keep the PID file locked,
>>>> preventing other processes to even read the file? Is there a
>>>> work around or solution for this problem?
>
> You must be using commons-daemon's procrun, otherwise known as the
> Windows service wrapper. That process creates (and possibly locks)
> the PID file for Tomcat.
>
>> This is only peripherally related to the OP, but is there a
>> situation where that file is not created, when using the windows
>> service wrapper? I run a dozen or so instances of TC 7.0.54 as
>> separate services on Windows 2008 R2 using the included renamed
>> version of procrun, and don't have any pid files anywhere that I
>> can find on my file system.
Sure: if you don't specify a --PidFile argument in procrun, you won't
get a PID file.
- -chris
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Re: PID file locked on Windows 2008 system
Posted by David kerber <dc...@verizon.net>.
On 11/4/2014 5:25 PM, Christopher Schultz wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA256
>
> Anil,
>
> On 11/4/14 2:58 PM, Anil Ambati wrote:
>> We have a requirement to read the PID file created by the Tomcat
>> server process on Windows, but we are not able to using
>> RandomAccessFile or FileInputStream because the file seems to be
>> locked by the Tomcat process.
>>
>>
>> Why does the Tomcat server keep the PID file locked, preventing
>> other processes to even read the file? Is there a work around or
>> solution for this problem?
>
> You must be using commons-daemon's procrun, otherwise known as the
> Windows service wrapper. That process creates (and possibly locks) the
> PID file for Tomcat.
This is only peripherally related to the OP, but is there a situation
where that file is not created, when using the windows service wrapper?
I run a dozen or so instances of TC 7.0.54 as separate services on
Windows 2008 R2 using the included renamed version of procrun, and don't
have any pid files anywhere that I can find on my file system.
>
> You may find users here who know the answer to your question, but you
> might have better luck posting to the commons mailing list to ask there.
>
> I suspect it's something silly like holding-open the PID file instead
> of writing to it and then closing it.
>
> - -chris
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Re: PID file locked on Windows 2008 system
Posted by Christopher Schultz <ch...@christopherschultz.net>.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
Anil,
On 11/4/14 2:58 PM, Anil Ambati wrote:
> We have a requirement to read the PID file created by the Tomcat
> server process on Windows, but we are not able to using
> RandomAccessFile or FileInputStream because the file seems to be
> locked by the Tomcat process.
>
>
> Why does the Tomcat server keep the PID file locked, preventing
> other processes to even read the file? Is there a work around or
> solution for this problem?
You must be using commons-daemon's procrun, otherwise known as the
Windows service wrapper. That process creates (and possibly locks) the
PID file for Tomcat.
You may find users here who know the answer to your question, but you
might have better luck posting to the commons mailing list to ask there.
I suspect it's something silly like holding-open the PID file instead
of writing to it and then closing it.
- -chris
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Re: PID file locked on Windows 2008 system
Posted by Anil Ambati <aa...@us.ibm.com>.
7.0.56
To make Tomcat to create a pid file , you need to specify name of the file
in the Tomcat 7 properties window (To open this window select, Configure
Tomcat menu option in the Windows Start menu)
Regards,
Anilkumar Ambati
4205 S Miami Blvd
WebSphere Virtual Enterprise Development
Durham, 27703-9141
Phone:
+1-919-254-6152
USA
Mobile:
+1-919-434-5674
e-mail:
aambati@us.ibm.com
"You have no responsibility to live up to what other people think you
ought to accomplish." -Richard Feynman (1918-1988)
From:
David kerber <dc...@verizon.net>
To:
Tomcat Users List <us...@tomcat.apache.org>,
Date:
11/04/2014 04:37 PM
Subject:
Re: PID file locked on Windows 2008 system
On 11/4/2014 4:21 PM, Anil Ambati wrote:
> I was referring to the .pid file Tomcat server creates in the logs
> directory. This file contains the process ID of the Tomcat process.
What version of Tomcat, Windows, and Java are you using? My 7.0.54
doesn't seem to create that file anywhere in the file system.
>
> Regards,
> ------------------------------------------------------------------------
> *Anilkumar Ambati* 4205 S Miami Blvd
> WebSphere Virtual Enterprise Development Durham,
27703-9141
> Phone: +1-919-254-6152 USA
> Mobile: +1-919-434-5674
> e-mail: aambati@us.ibm.com
> ------------------------------------------------------------------------
> "You have no responsibility to live up to what other people think you
> ought to accomplish." -Richard Feynman (1918-1988)
>
>
>
>
>
> From: David kerber <dc...@verizon.net>
> To: Tomcat Users List <us...@tomcat.apache.org>,
> Date: 11/04/2014 03:45 PM
> Subject: Re: PID file locked on Windows 2008 system
>
>
> ------------------------------------------------------------------------
>
>
>
> On 11/4/2014 2:58 PM, Anil Ambati wrote:
> > Hi,
> > We have a requirement to read the PID file created by the Tomcat
server
> > process on Windows, but we are not able to using RandomAccessFile or
> > FileInputStream because the file seems to be locked by the Tomcat
> process.
>
> What is the PID file? The only abbreviation I know by that name is the
> Process ID, which is just a number.
>
>
>
> >
> >
> > Why does the Tomcat server keep the PID file locked, preventing other
> > processes to even read the file? Is there a work around or solution
for
> > this problem?
> >
> > Any help is appreciated. Thank you in advance.
> >
> >
> > Regards,
> >
> >
> > Regards,
> >
------------------------------------------------------------------------
> > *Anilkumar Ambati* 4205 S Miami Blvd
> > WebSphere Virtual Enterprise Development Durham, 27703-9141
> > Phone: +1-919-254-6152 USA
> > Mobile: +1-919-434-5674
> > e-mail: aambati@us.ibm.com
> >
------------------------------------------------------------------------
> > "You have no responsibility to live up to what other people think you
> > ought to accomplish." -Richard Feynman (1918-1988)
> >
> >
>
>
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>
>
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Re: PID file locked on Windows 2008 system
Posted by David kerber <dc...@verizon.net>.
On 11/4/2014 4:21 PM, Anil Ambati wrote:
> I was referring to the .pid file Tomcat server creates in the logs
> directory. This file contains the process ID of the Tomcat process.
What version of Tomcat, Windows, and Java are you using? My 7.0.54
doesn't seem to create that file anywhere in the file system.
>
> Regards,
> ------------------------------------------------------------------------
> *Anilkumar Ambati* 4205 S Miami Blvd
> WebSphere Virtual Enterprise Development Durham, 27703-9141
> Phone: +1-919-254-6152 USA
> Mobile: +1-919-434-5674
> e-mail: aambati@us.ibm.com
> ------------------------------------------------------------------------
> "You have no responsibility to live up to what other people think you
> ought to accomplish." -Richard Feynman (1918-1988)
>
>
>
>
>
> From: David kerber <dc...@verizon.net>
> To: Tomcat Users List <us...@tomcat.apache.org>,
> Date: 11/04/2014 03:45 PM
> Subject: Re: PID file locked on Windows 2008 system
>
>
> ------------------------------------------------------------------------
>
>
>
> On 11/4/2014 2:58 PM, Anil Ambati wrote:
> > Hi,
> > We have a requirement to read the PID file created by the Tomcat server
> > process on Windows, but we are not able to using RandomAccessFile or
> > FileInputStream because the file seems to be locked by the Tomcat
> process.
>
> What is the PID file? The only abbreviation I know by that name is the
> Process ID, which is just a number.
>
>
>
> >
> >
> > Why does the Tomcat server keep the PID file locked, preventing other
> > processes to even read the file? Is there a work around or solution for
> > this problem?
> >
> > Any help is appreciated. Thank you in advance.
> >
> >
> > Regards,
> >
> >
> > Regards,
> > ------------------------------------------------------------------------
> > *Anilkumar Ambati* 4205 S Miami Blvd
> > WebSphere Virtual Enterprise Development Durham, 27703-9141
> > Phone: +1-919-254-6152 USA
> > Mobile: +1-919-434-5674
> > e-mail: aambati@us.ibm.com
> > ------------------------------------------------------------------------
> > "You have no responsibility to live up to what other people think you
> > ought to accomplish." -Richard Feynman (1918-1988)
> >
> >
>
>
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>
>
>
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Re: PID file locked on Windows 2008 system
Posted by Anil Ambati <aa...@us.ibm.com>.
I was referring to the .pid file Tomcat server creates in the logs
directory. This file contains the process ID of the Tomcat process.
Regards,
Anilkumar Ambati
4205 S Miami Blvd
WebSphere Virtual Enterprise Development
Durham, 27703-9141
Phone:
+1-919-254-6152
USA
Mobile:
+1-919-434-5674
e-mail:
aambati@us.ibm.com
"You have no responsibility to live up to what other people think you
ought to accomplish." -Richard Feynman (1918-1988)
From:
David kerber <dc...@verizon.net>
To:
Tomcat Users List <us...@tomcat.apache.org>,
Date:
11/04/2014 03:45 PM
Subject:
Re: PID file locked on Windows 2008 system
On 11/4/2014 2:58 PM, Anil Ambati wrote:
> Hi,
> We have a requirement to read the PID file created by the Tomcat server
> process on Windows, but we are not able to using RandomAccessFile or
> FileInputStream because the file seems to be locked by the Tomcat
process.
What is the PID file? The only abbreviation I know by that name is the
Process ID, which is just a number.
>
>
> Why does the Tomcat server keep the PID file locked, preventing other
> processes to even read the file? Is there a work around or solution for
> this problem?
>
> Any help is appreciated. Thank you in advance.
>
>
> Regards,
>
>
> Regards,
> ------------------------------------------------------------------------
> *Anilkumar Ambati* 4205 S Miami Blvd
> WebSphere Virtual Enterprise Development Durham,
27703-9141
> Phone: +1-919-254-6152 USA
> Mobile: +1-919-434-5674
> e-mail: aambati@us.ibm.com
> ------------------------------------------------------------------------
> "You have no responsibility to live up to what other people think you
> ought to accomplish." -Richard Feynman (1918-1988)
>
>
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Re: PID file locked on Windows 2008 system
Posted by David kerber <dc...@verizon.net>.
On 11/4/2014 2:58 PM, Anil Ambati wrote:
> Hi,
> We have a requirement to read the PID file created by the Tomcat server
> process on Windows, but we are not able to using RandomAccessFile or
> FileInputStream because the file seems to be locked by the Tomcat process.
What is the PID file? The only abbreviation I know by that name is the
Process ID, which is just a number.
>
>
> Why does the Tomcat server keep the PID file locked, preventing other
> processes to even read the file? Is there a work around or solution for
> this problem?
>
> Any help is appreciated. Thank you in advance.
>
>
> Regards,
>
>
> Regards,
> ------------------------------------------------------------------------
> *Anilkumar Ambati* 4205 S Miami Blvd
> WebSphere Virtual Enterprise Development Durham, 27703-9141
> Phone: +1-919-254-6152 USA
> Mobile: +1-919-434-5674
> e-mail: aambati@us.ibm.com
> ------------------------------------------------------------------------
> "You have no responsibility to live up to what other people think you
> ought to accomplish." -Richard Feynman (1918-1988)
>
>
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