cpanel and mod passenger with PassengerMinInstances 1 not working

[James Tt]

im using centos 6 with cpanel with mod passenger. i tried to configure extra custom apache configuration for a domain, and vi /usr/local/apache/conf/userdata/std/2/username/domain.com/rails.conf

and configured:

PassengerMinInstances 1

PassengerMaxPoolSize 3

but the instance seems to auto shutdown after 5minutes of inactive

anyone encounter similar issue?

[Daniel Knoppel]

5 min is the default instance timeout time when no mininstances is set. Anything above the minimum configured will auto-timeout.

Are you 100% sure passenger is using that config? For example, if you change the PassengerMaxPoolSize to 9 and do passenger-status, does it show that the max is 9?

- Daniel

[James Tt]

hi,

you are right, i tried to set maxpoolsize to 6

passenger-status seems to show same 3

what could go wrong?

my apache does not throw any configuration error,

and ive restarted apache after the update

here is my config:

Alias /shop /home/username/rails/current/public

PassengerRuby /usr/local/rvm/gems/ruby-2.2.2/wrappers/ruby

PassengerMinInstances 1

PassengerMaxPoolSize 5

<Directory /home/username/rails/current/public>

SetEnv RAILS_RELATIVE_URL_ROOT "/shop"

PassengerAppRoot /home/username/rails/current

PassengerBaseURI /shop

Options -MultiViews

AllowOverride All

Allow from All

</Directory>

<Location /assets/>

# Use of ETag is discouraged when Last-Modified is present

Header unset ETag

FileETag None

# RFC says only cache for 1 year

ExpiresActive On

ExpiresDefault "access plus 1 year"

</Location>

PassengerRuby seems to work.

and SetEnv RAILS_RELATIVE_URL_ROOT also working

i tried to move PassengerMinInstances into directory config block, it throws apache configuration error

is there any other place to set this correctly?

thanks

[Daniel Knoppel]

What could be happening is that it is just using a different config file from somewhere else. Maybe do a text search for something like PassengerMaxPoolSize.

- Daniel

[James Tt]

Hi Daniel,

ive checked,

cpanel load the include file within the block virtualhost

didnt work.

i searched for PassengerMaxPoolSize, cant find

wait. is this applicable only in enterprise edition?

[Daniel Knoppel]

Max pool size? No, standard open source feature. It would give an error otherwise.

If cpanel is really using the file then the only thing I can think of is that you're trying to configure the same application in multiple domains. If you try to do this, the settings (like the max pool size) from one domain will overwrite the other (depending on which domain gets the last request).

If this is the case you should solve it by assigning different app groups:

https://www.phusionpassenger.com/library/config/apache/reference/#passengerappgroupname

- Daniel 

[James Tt]

hi Daniel,

isn't passenger configuration group within virtualhost directive?

ive even tried to set it under global configuration, it doesnt seems to work.

does cloud linux have any effect on this?

[James Tt]

hi Daniel,

ive added

PassengerAppGroupName "mydomain.com group"

passenger-status shows:

*** Cleaning stale instance directory /tmp/passenger.8Y8dUtk

    Warning: Operation not permitted @ rb_file_chown - /tmp/passenger.8Y8dUtk/.

*** Cleaning stale instance directory /tmp/passenger.8W0tzLe

    Warning: Operation not permitted @ rb_file_chown - /tmp/passenger.8W0tzLe/.

*** Cleaning stale instance directory /tmp/passenger.cknU2Z0

    Warning: Operation not permitted @ rb_file_chown - /tmp/passenger.cknU2Z0/.

*** Cleaning stale instance directory /tmp/passenger.OgAYEVb

    Warning: Operation not permitted @ rb_file_chown - /tmp/passenger.OgAYEVb/.

Version : 5.0.23

Date    : 2016-03-28 11:37:18 +0800

Instance: Ni6OGeR8 (Apache/2.4.16 (Unix) OpenSSL/1.0.1e-fips Phusion_Passenger/5.0.21)

----------- General information -----------

Max pool size : 3

App groups    : 8

Processes     : 3

Requests in top-level queue : 0

----------- Application groups -----------

mydomain.com group:

  App root: /home/mydomain/rails/current

  Requests in queue: 0

  * PID: 629669   Sessions: 0       Processed: 1       Uptime: 14s

    CPU: 7%      Memory  : 85M     Last used: 14s ago

will it show group based max pool?

my max pool is set to 5, but it does not show anywhere...

On Friday, 25 March 2016 17:45:14 UTC+8, Daniel Knoppel wrote:

[Daniel Knoppel]

Sorry, I worded it incorrectly; 

1) The max pool size is a global setting, not per application. See documentation: https://www.phusionpassenger.com/library/config/apache/reference/#passengermaxpoolsize

2) The problem you reported was with min instances seemingly not being respected, that is a per group setting and should be solved now if you configure it for that group.

- Daniel

[James Tt]

hi Daniel,

okay, my concern is min instances,

how do i know if min instances is working?

from my test, adding 

PassengerMinInstances 1 within

• Virtualhost (not working)
  
• Virtualhost > Directory (public - also not working)

the instance will auto shutdown

[Daniel Knoppel]

Version : 5.0.23

Date    : 2016-03-28 11:37:18 +0800

Instance: Ni6OGeR8 (Apache/2.4.16 (Unix) OpenSSL/1.0.1e-fips Phusion_Passenger/5.0.21)

You have multiple versions of Passenger installed according to this output. You can try removing the older versions and installing the latest (5.0.26).

- Daniel

[James Tt]

hi Daniel,

no matter version 5.0.23 or 5.0.21, it should support min instance ,

i dont think this version differences should matter

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[Daniel Knoppel]

What I'm trying to say is that using two different passenger versions mixed is likely to cause problems. I don't know what you are using it for but you can already see strange things happening in your passenger-status where it's detecting stale instance directories and failing to clean them, that's not supposed to happen. I can easily imagine your config isn't working as expected either because different settings are getting mixed.

N.B. we haven't gotten any other reports about this, and I haven't seen any problems with the setting since the fix we did in 5.0.8.

- Daniel

On Wednesday, March 30, 2016 at 11:52:29 AM UTC+2, James Tt wrote:

hi Daniel,

no matter version 5.0.23 or 5.0.21, it should support min instance ,

i dont think this version differences should matter

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[James Tt]

hi Daniel,

okay, ive updated it to use same version.

i got the feeling that if my session is logged into server,

the passenger-status seems to remain 1 instance,

but when i log out from shell after 20minutes and tried to open the rails url,

it seems to restarting the instance again...

passenger-status

*** Cleaning stale instance directory /tmp/passenger.8Y8dUtk

    Warning: Operation not permitted @ rb_file_chown - /tmp/passenger.8Y8dUtk/.

*** Cleaning stale instance directory /tmp/passenger.8W0tzLe

    Warning: Operation not permitted @ rb_file_chown - /tmp/passenger.8W0tzLe/.

*** Cleaning stale instance directory /tmp/passenger.cknU2Z0

    Warning: Operation not permitted @ rb_file_chown - /tmp/passenger.cknU2Z0/.

*** Cleaning stale instance directory /tmp/passenger.Yz1w1IN

    Warning: Operation not permitted @ rb_file_chown - /tmp/passenger.Yz1w1IN/.

*** Cleaning stale instance directory /tmp/passenger.OgAYEVb

    Warning: Operation not permitted @ rb_file_chown - /tmp/passenger.OgAYEVb/.

Version : 5.0.26

Date    : 2016-03-31 11:16:08 +0800

Instance: xhAtiTqn (Apache/2.4.16 (Unix) OpenSSL/1.0.1e-fips Phusion_Passenger/5.0.26)

----------- General information -----------

Max pool size : 3

App groups    : 5

Processes     : 2

Requests in top-level queue : 0

----------- Application groups -----------

mydomain.com group:

  App root: /home/myuser/rails/production

  Requests in queue: 0

[James Tt]

ok this time i kept my shell open with top -U myusername,

after 10minutes, the ruby instance is gone,

when i visit the url, 2 ruby instance running, 

after awhile, only 1 ruby instance is running, i think the mininstance is working.

but after 10minutes, 0 ruby instance is running.

how can i maintain at least 1 instance running for infinity time?