sharing instance_home?

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sharing instance_home?

by Jürgen Herrmann :: Rate this Message:

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currently i'm running a single zope2 process with relstorage
as storage backend. to improve performance for our end users
i'd like to fire up a 2nd zope2 process that will handle all
internal background processes and db packing.

for simplicity's sake i'd like to share the instance_home
directory between these two processes, just use a different
config file to enter a different http port for each server.

no how can i run 2 zope processes from the same instance
home with 2 different config files?
modifying $INSTANCE_HOME/zopectl to include a different
config file name does not work, as it's also contained in
$INSTANCE_HOME/runzope. renaming/modifying runzope does not
work either, as it's name is hardcoded somewhere in zopectl.

thanks in advance and best regards,
jürgen herrmann
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Re: sharing instance_home?

by Chris Withers :: Rate this Message:

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Jürgen Herrmann wrote:
> no how can i run 2 zope processes from the same instance
> home with 2 different config files?

What version of Zope is this?

Should be fine, provided the instances are configured to use different
pid files, log files, local zodb cache files, etc...

Chris

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Re: sharing instance_home?

by Jürgen Herrmann :: Rate this Message:

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On Wed, November 4, 2009 15:05, Chris Withers wrote:

> Jürgen Herrmann wrote:
>> no how can i run 2 zope processes from the same instance
>> home with 2 different config files?
>
> What version of Zope is this?
>
> Should be fine, provided the instances are configured to use different
> pid files, log files, local zodb cache files, etc...
>
> Chris
>
- it's zope 2.12.1 .
- i configured different log/pid files in the different configs.

jürgen
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Re: sharing instance_home?

by M.J. Pieters :: Rate this Message:

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2009/11/4 Jürgen Herrmann <Juergen.Herrmann@...>:

> currently i'm running a single zope2 process with relstorage
> as storage backend. to improve performance for our end users
> i'd like to fire up a 2nd zope2 process that will handle all
> internal background processes and db packing.
>
> for simplicity's sake i'd like to share the instance_home
> directory between these two processes, just use a different
> config file to enter a different http port for each server.
>
> no how can i run 2 zope processes from the same instance
> home with 2 different config files?
> modifying $INSTANCE_HOME/zopectl to include a different
> config file name does not work, as it's also contained in
> $INSTANCE_HOME/runzope. renaming/modifying runzope does not
> work either, as it's name is hardcoded somewhere in zopectl.

If you are using RelStorage you won't be saving much space by reusing
the instance home. I'd be wary of sharing the directory between
instances, because 3rd party products sometimes use it to store
instance-specific data (e.g. not sharable between 2 zope processes).

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Re: sharing instance_home?

by Chris Withers :: Rate this Message:

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Martijn Pieters wrote:
> If you are using RelStorage you won't be saving much space by reusing
> the instance home. I'd be wary of sharing the directory between
> instances, because 3rd party products sometimes use it to store
> instance-specific data (e.g. not sharable between 2 zope processes).

They do? That seems pretty evil... Have you got some examples?

Chris

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Re: sharing instance_home?

by M.J. Pieters :: Rate this Message:

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On 4. nov.. 2009, at 18.20, Chris Withers wrote:
> Martijn Pieters wrote:
>> If you are using RelStorage you won't be saving much space by reusing
>> the instance home. I'd be wary of sharing the directory between
>> instances, because 3rd party products sometimes use it to store
>> instance-specific data (e.g. not sharable between 2 zope processes).
>
> They do? That seems pretty evil... Have you got some examples?

Why would that be evil? That's what the instance home is for, to store  
instance-specific data.

No examples here.

Martijn Pieters
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Parent Message unknown Re: sharing instance_home?

by Jürgen Herrmann :: Rate this Message:

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On Wed, November 4, 2009 15:05, Chris Withers wrote:
> Jürgen Herrmann wrote:
>> no how can i run 2 zope processes from the same instance
>> home with 2 different config files?
>
> What version of Zope is this?
>
> Should be fine, provided the instances are configured to use different pid files, log files,
local zodb cache files, etc...
>
> Chris
>

a few observations:
 - running several zope processes inside one instance_home is
   very simple via modified runzope shell scripts (just modify
   config filename)
 - trying the same via zopectl is a pita because:
   o when doing a "zopectl start" it calls runzope in the end
     and does not pass the config filename, instead runzope uses
     the hardcoded one in itself
   o zopectl abviously uses hard coded socket name and the daemon
     manager refuses to start up twice...
   o i got tired trying to fix that stuff, as making my own set of
     startup scripts calling runzope only took me very little time.
     works for me now.
     what's the point of that really complex daemon manager anyway?
 - i have not observed any product that puts runtime data in the
   instance_home, except ThreadSafeCounter which uses lock files in
   instance_home/var. i want to share these lock files between
   processes anyway, so this is rather good than bad. no problems
   with my other products.

best regards,
jürgen
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