RE: Configuring Tomcat5/Apache2/JK2 for load balancing??

[Kwong Chong]

Hi,

JkWorkersFile or JkMount are mod_jk directives, you need to use the
equivalent mod_jk2 directives,

something like :

(jkmount equiv)
[uri:/*.jsp]
worker=lb:LB

(jkworkersfile equiv)
JkSet config:file /{path}/workers2.properties

Kwong.

-Original Message-
From: Kevin Hartig [mailto:[EMAIL PROTECTED]
Sent: Friday, 28 March 2003 8:45
To: Tomcat Users List
Subject: Re: Configuring Tomcat5/Apache2/JK2 for load balancing??


OK. Thx.

But Apache 2 still doesn't recognize the  JkWorkersFile or JkMount 
parameters. Have these changed?

John Turner wrote:


 If you're using JK2, you don't want mod_jk.conf file.  ApacheConfig 
 and mod_jk.conf are only for JK, not JK2.

 John

 On Thu, 27 Mar 2003 14:02:23 -0700, Kevin Hartig 
 [EMAIL PROTECTED] wrote:

 I would like to configure multiple instances of Tomcat for load 
 balancing.
 Most of the documentation I have found on this refers to older 
 versions of Tomcat and Apache which are only partially correct.

 I  am running on Windows 2000, using Tomcat 5, Apache 2.0.44, and JK2 
 2.0.43.

 First, is there current documentation that describes setting up a 
 load balanced configuration?
 The first problem I have run into so far is that the JK options 
 defined in the Apache http.conf are not recognized even though the 
 module appears to be loaded successfully. Also I haven't been able to 
 get Tomcat to auto-generate the mod_jk.conf file. The classes that 
 generated them in Tomcat 4 are not in Tomcat ??

 Anyone else have this working with the latest versions of Tomcat and 
 Apache?

 ---
 Kevin Hartig[EMAIL PROTECTED]
 Technical Architect Mobile: 303.378.0579
 Sun Microsystems, Inc.  AIM: kwhartig



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RE: Infuriating port problem 80 - 8443 and 8008 - 8443

[Kwong Chong]

Perhaps some other process is already listening to port 80..

stop tomcat and try something like
netstat -an | grep LISTEN
and see if anything shows up as listening on port 80

Kwong.

-Original Message-
From: John Turner [mailto:[EMAIL PROTECTED]
Sent: Wednesday, 26 March 2003 0:40
To: Tomcat Users List
Subject: Re: Infuriating port problem 80 - 8443 and 8008 - 8443



If it was a root restriction issue, Tomcat wouldn't even start.

John

On Tue, 25 Mar 2003 13:26:35 -, James Lewis 
[EMAIL PROTECTED] wrote:

 Obviously I meant Linux, although root access on Linus sounds 
 interesting...

 -Original Message-
 From: James Lewis [mailto:[EMAIL PROTECTED]
 Sent: 25 March 2003 13:24
 To: Tomcat Users List
 Subject: RE: Infuriating port problem 80 - 8443 and 8008 - 8443


 is the User who is running the server root? Some ports are
 privileged and
 you need root access on Linus to use them (someone can correct me on the
 exact ones no doubt :p)

 james


  -Original Message-
  From: Jamesey [mailto:[EMAIL PROTECTED]
  Sent: 25 March 2003 13:16
  To: [EMAIL PROTECTED]
  Subject: Infuriating port problem 80 - 8443 and 8008 - 8443
 
 
  My web app has been working fine for weeks switching from 8080 to 
 8443..
 
  however.. i've now reconfigured it to port 80 and it after
  submitting to my
  struts action servlet.. i get page not found..
  if i switch it back to 8080 its fine..
 
  anyone know if im doing sometihng wrong?
 
  DETAILS: - Server.xml
  !-- Define a non-SSL Coyote HTTP/1.1 Connector on port 8080 --
 
  Connector className=org.apache.coyote.tomcat4.CoyoteConnector
 
  port=80 minProcessors=5 maxProcessors=75
 
  enableLookups=false redirectPort=8443
 
  acceptCount=100 debug=0 connectionTimeout=2
 
  useURIValidationHack=false disableUploadTimeout=true /
 
  !-- Note : To disable connection timeouts, set connectionTimeout 
 value
 
  to -1 --
 
 
 
 
 
  !-- Define a SSL Coyote HTTP/1.1 Connector on port 8443 --
 
  Connector className=org.apache.coyote.tomcat4.CoyoteConnector
 
  port=8443 minProcessors=5 maxProcessors=75
 
  enableLookups=false
 
  acceptCount=100 debug=0 scheme=https secure=true
 
  useURIValidationHack=false disableUploadTimeout=true
 
  Factory 
 className=org.apache.coyote.tomcat4.CoyoteServerSocketFactory
 
  clientAuth=false protocol=TLS /
 
  /Connector
 
  -- snip
 
  Host name=james_laptop debug=0 appBase=webapps
 
  unpackWARs=true 
 
  Logger className=org.apache.catalina.logger.FileLogger
 
  directory=logs prefix=localhost_log. suffix=.txt
 
  timestamp=true/
 
  Context path= docBase=MyApp debug=0 reloadable=true
 
 
  Logger className=org.apache.catalina.logger.FileLogger
 
  prefix=james_laptop_log. suffix=.txt
 
  timestamp=true/
 
  Manager className=org.apache.catalina.session.PersistentManager
 
  debug=0
 
  saveOnRestart=true
 
  maxActiveSessions=-1
 
  minIdleSwap=-1
 
  maxIdleSwap=-1
 
  maxIdleBackup=-1
 
  Store className=org.apache.catalina.session.FileStore/
 
  /Manager
 
  /Context
 
  /Host
 
 
 
 
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RE: RE : Lb_factor didn't work as expected

[Kwong Chong]

Hi there,

Instead of
worker.tomcat1.lbfactor=1
try
worker.tomcat1.lb_factor=1

in any event, observer the jk2status page while your app is under load -
it will help you understand what is happening.

Kwong.

-Original Message-
From: LAGALISSE Eric [mailto:[EMAIL PROTECTED]
Sent: Sunday, 23 March 2003 0:14
To: Tomcat Users List
Subject: RE : Lb_factor didn't work as expected


Yes, we are using the worker MPM and the behavior mentionned in my
initial mail if we use the same lb_factor value 1.

Eric LAGALISSE

-Message d'origine-
De : Bill Barker [mailto:[EMAIL PROTECTED] 
Envoyé : samedi 22 mars 2003 09:59
À : [EMAIL PROTECTED]
Objet : Re: Lb_factor didn't work as expected

Which MPM are you using?  AFAIK, the load balancing only works currently
with the 'worker' MPM.


LAGALISSE Eric [EMAIL PROTECTED] wrote in message
news:[EMAIL PROTECTED]
After several test using mod_jk 2.0.43 on Linux with apache 2.0.43 we
noticed that if we define workers.properties as follow the load balancing
send to both tomcat server but not in the same ratio.
For example if we stress with 100 users, 80 are routed to the first tomcat
server declared in workers.properties and 20 are routed to the second.

So if soemone on this small planet already configured and tested
SUCCESSFULLY the load balancing we'll very interested in his experience on
this subject.

# Workers.properties
ps=/

worker.list=infonetworker

# 
# First tomcat server
# 
worker.tomcat1.port=8112
worker.tomcat1.host=clos1030.casden.fr
worker.tomcat1.type=ajp13
worker.tomcat1.cachesize=10
worker.tomcat1.cache_timeout=600
worker.tomcat1.socket_keepalive=0
worker.tomcat1.socket_timeout=300



#
# Specifies the load balance factor when used with
# a load balancing worker.
# Note:
#   lbfactor must be  0
#   Low lbfactor means less work done by the worker.
worker.tomcat1.lbfactor=1

# 
# Second tomcat server
# 
worker.tomcat2.port=8112
worker.tomcat2.host=clos1032.casden.fr
worker.tomcat2.type=ajp13
worker.tomcat2.cachesize=10
worker.tomcat2.cache_timeout=600
worker.tomcat2.socket_keepalive=0
worker.tomcat2.socket_timeout=300

#
# Specifies the load balance factor when used with
# a load balancing worker.
# Note:
#   lbfactor must be  0
#   Low lbfactor means less work done by the worker.
worker.tomcat2.lbfactor=1


# 
# Load Balancer worker
# 
#

# The loadbalancer (type lb) worker performs weighted round-robin
# load balancing with sticky sessions.
# Note:
#   If a worker dies, the load balancer will check its state
#once in a while. Until then all work is redirected to peer
#worker.
worker.infonetworker.type=lb
worker.infonetworker.balanced_workers=tomcat1, tomcat2


#
# END workers.properties
#


Eric LAGALISSE



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RE: Convenience on using apache+tomcat vs tomcat alone

[Kwong Chong]

Hi there,

I guess it's fine if you are using one tomcat instance;
You will need webserver(s) with mod jk/jk2 for loadbalancing and
failover when using multiple instances

Kwong.

-Original Message-
From: Simone Chiaretta [mailto:[EMAIL PROTECTED]
Sent: Thursday, 13 March 2003 20:32
To: Tomcat User List
Subject: Convenience on using apache+tomcat vs tomcat alone


Hello All,
I'm in the process of setting up a real-production server to serve a dynamic
jsp driven website.
And I'm facing the decision if using tomcat alone or apache+jk+tomcat.

From what I've read on the ML I think that is best to use tomcat alone
because I've got a completely dynamic web site, with just a few graphical
images and not static html pages... so I think that the double step of
apache that ask tomcat to give me a response is just a performance
degradation...

Are my thoughts right? or am I missing something?

or maybe using JK2 instead of JK will give me benefetis even if the site is
fully jsp driven?

Thank you all
Simone

-
Simone Chiaretta
www.piyosailing.com/S
Any sufficiently advanced technology is indistinguishable from magic


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RE: three tiers on three machines: Apache, Tomcat, DB

[Kwong Chong]

There is hope!

I have been able to run up :

multiple apache instances on one tier, talking to
multiple tomcat instances on another tier,
with a load balancer sitting in front of the websevers.

using solaris 8, apache 2.0.43, tomcat 4.1.18

After you define your channels and workers, eg

# Define channels
[channel.socket:channel1]
port=2111
host=apphost1
tomcatId=tc1

[channel.socket:channel2]
port=2112
host=apphost2
tomcatId=tc2

# Define workers
[ajp13:worker1]
channel=channel.socket:channel1

[ajp13:worker2]
channel=channel.socket:channel2

you can then define a loadbalancer worker :

[lb:LBworker]
attempts=1
recovery=30
timeout=0
worker=ajp13:worker1
worker=ajp13:worker2


after that, configure your URI directives to send dynamic traffic to the
LBworker :

# Uri mapping
[uri:/*.jsp]
worker=lb:LBworker

[uri:/*.do]
worker=lb:LBworker


Of course if you have any firewalls between your webserver and your app
servers, they will need to be configured to let traffic through.. in
this example, tcp/ip on ports 2111 , 2112.

Good luck!


Kwong.

-Original Message-
From: Mark Eggers [mailto:[EMAIL PROTECTED]
Sent: Friday, 14 March 2003 6:56
To: Tomcat Users List
Subject: Re: three tiers on three machines: Apache, Tomcat, DB


Terence,

I've never done this, and I don't have three machines
to test this on.  However, this is how I would
approach things:

#
# workers2.properties
# replace hostname with your host name for Tomcat
# replace ip_address with your host ip address for 
# Tomcat
#
[channel.socket:hostname:8009]
port = 8009
host = ip_address

# define the worker
[ajp13:hostname:8009]
channel=channel.socket:hostname:8009

# map a URI
[uri:/examples/*.jsp]
worker=ajp13:hostname:8009

#
# jk2.properties
#
# Socket configuration
#
handler.list=request,container,channelSocket

#
# socket configuration
#
channelSocket.port=8009
channelSocket.address=ip_address
channelSocket.maxPort=port+10

!-- JNDI stuff
see the following in the documentation and replace
localhost with the name or ip address of your database
server.  This should get remote database connections
up and running

http://localhost:8080/tomcat-docs/jndi-datasource-examples-howto.html

--

There are a few issues that I'm not sure about.  One
is how to get the URIs correct when a request is
forwarded from your Apache host to the Tomcat host. 
Does this happen automatically, or do you need to do
some URI rewriting?

Also, lacing static and dynamic pages together might
get interesting.  I would imagine that you would need
to create the same site structure on both machines so
that html, images, css files, jsp files, and servlets
can 'find' each other.

Just some thoughts - hope this gets you started.

/mde/
just my two cents . . . .

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RE: Play the key ctr + c in any directions, the server(Tomcat4.x) will be shutdow

[Kwong Chong]

Try ./catalina.sh start 

Kwong.

-Original Message-
From: deep blue [mailto:[EMAIL PROTECTED]
Sent: Wednesday, 12 March 2003 13:58
To: [EMAIL PROTECTED]
Subject: Play the key ctr + c in any directions, the server(Tomcat
4.x) will be shutdow


I'm using Tomcat 4.x for soloris sparc. When tomcat is running(using 
command:nohup catalina.sh run ), if I play the key ctr + c in any 
directions or close the telnet terminal, the server will be shut down. I 
don't know what causes it? Please help me.


_
ÏíÓÃÊÀ½çÉÏ×î´óµÄµç×ÓÓʼþϵͳ¡ª MSN Hotmail¡£  http://www.hotmail.com  


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RE: Problems configuring Tomcat with Apache using mod_jk2

[Kwong Chong]

Looks like you need (assuming you don't already have) a

[uri:/examples]
worker=worker

in your workers2.properties file to tell apache to forward such requests
to tomcat..

hope this helps

Kwong.

-Original Message-
From: David Godfrey [mailto:[EMAIL PROTECTED]
Sent: Wednesday, 5 March 2003 3:36
To: '[EMAIL PROTECTED]'
Subject: Problems configuring Tomcat with Apache using mod_jk2 


Hi,

I'm having problems when trying to use Tomcat and Apache HTTP server
together, with mod_jk2. I have built Apache from the source, installed
Tomcat 4.1.18, and tested each individually (they seem to function
correctly). When I add in mod_jk2, both Apache and Tomcat still start and
function correctly, but there does not appear to be any redirection taking
place, (I can access http://localhost:8080/examples for, but not
http://localhost/examples). 

When I examine error_log in APACHE_HOME/logs, there are the following 2
entries, but nothing that (to me) indicates an error:  

Apache/2.0.43 (Unix) mod_jk/1.2.1 configured -- resuming normal
operations

File does not exist: /opt/apache/htdocs/examples

The error/log file I have defined in httpd.conf for mod_jk2 is created when
I start Apache / Tomcat, but is empty. I am running Solaris 2.8, Apache
2.0.43, Tomcat 4.1.18, and Java 1.4.1.

I would really appreciate some ideas on how I could solve this problem.

Many thanks,

D




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RE: how can I disable directory listing at client side

[Kwong Chong]

Hmmm should have thought to check this out earlier.. it looks like
tomcat is indeed processing the request.

But given that there is no uri directive governing the forwarding of 
/images/ would it be a bug then that it is forwarded to tomcat?

-Original Message-
From: Tam, Michael [mailto:[EMAIL PROTECTED]
Sent: Thursday, 27 February 2003 9:50
To: 'Tomcat Users List'
Subject: RE: how can I disable directory listing at client side


The listing maybe coming from tomcat itself.  Make sure you disable tomcat
directory listing as well.

-Original Message-
From: Kwong Chong [mailto:[EMAIL PROTECTED]
Sent: Wednesday, February 26, 2003 2:31 PM
To: [EMAIL PROTECTED]
Subject: RE: how can I disable directory listing at client side


Hmm I have a similar problem that's been bugging me - 
The way I normally disable directory listing is to remove the 
Options Indexes option from the Directory directive, ending up with

Directory /
Options FollowSymLinks
AllowOverride None
/Directory

With apache running alone, this all works fine, if you try to get a
directory listing, you get a forbidden message - everything a ok!

When I then configure apache to use modjk2, and to auto forward dynamic
pages to the application server, ie adding

DirectoryIndex  index.jsp index.html

in httpd.conf,

and

[uri:/*.jsp]
worker=lb:workerLB

in workers2.properties,

Everything seems to work fine; dynamic pages work etc, but I can now get
directory listings!

When I change DirectoryIndex to just
DirectoryIndex index.html

directory listing is disabled again,
or when I remove the 
[uri:/*.jsp]
worker=lb:workerLB
from workers2.properties,
directory listing is disabled too!

Any ideas?

Kwong.

-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Sent: Wednesday, 26 February 2003 8:22
To: [EMAIL PROTECTED]
Subject: RE: how can I disable directory listing at client side


Do it in your apache httpd.conf

Regards,
 
 
PQ
 
This Guy Thinks He Knows Everything
This Guy Thinks He Knows What He Is Doing

-Original Message-
From: runu rathi [mailto:[EMAIL PROTECTED] 
Sent: February 25, 2003 3:33 PM
To: [EMAIL PROTECTED]
Subject: how can I disable directory listing at client side

Hi all,
  How can I disable the directory listing to be shown
when someone tries to load my application remotely
through a browser?
I shall appreciate any help.
Thanks,
Runu

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Re: Load Balanced Tomcat freezing under high load

[Kwong Chong]

Hi,

this problem will probably be due partly to the round robin load
balancing in the modjk2 connector, as well as the application trying to
process too many requests at one time (context switching), if you are
using the sun jdk1.4, that might cause problems as well.

With round robin load balancing, as soon as you start receiving load
faster than you can process them, you will start seeing problems where
the slower workers tend to receive more and more requests in their
queue; the more requests they try to process at once, the slower they
become (due to context switching etc), and the slower they become the
longer their queue gets, etc etc.

One way to get around this might be to set limits on tomcat (tomcat
experts help me out here) lower the setting on maxprocessors and the
accept count so that the worker will reject new settings before it gets
more than it can handle.

I have also experienced a problem using the sun jdk1.4 where
occasionally a worker will go into a state where it just about uses up
as much cpu as the system will allow it and stop responding - checking
out the process shows it makes a HUGE number of system calls; 
truss would show a lot of

lwp_suspend
lwp_continue
lwp_kill
lwp_mutex_wakeup
lwp_mutex_lock
lwp_cond_wait
lwp_cond_signal
lwp_cond_broadcast

I've yet to get to the bottom of this ... but when this happens nothing
short of a restart of the process seems to help.

Hope this helps,

Kwong


-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Sent: Thursday, 27 February 2003 7:35
To: [EMAIL PROTECTED]
Subject: Load Balanced Tomcat freezing under high load



  Hi all.. we're running Apache 2.0.44, mod_jk2 2.0.2 and Tomcat 4.0.6 (all
compiled from source) load-balanced across 4 machines. Occasionally
(usually at peak times) one of the systems (usually the first one listed
in the workers2.properties) will freeze up and the CPU will go through the
roof. 'top' shows that its one particular java process consuming 99% of
the CPU. (I think it's one of the first ones spawned when tomcat is
started). At this point the Apache hits it's MaxClients (512) and the site
goes down, despite the other Tomcat workers being alive and well. I'm
pretty sure it's not an Apache problem as I just upgraded from
1.3.27/mod_jk-1.2 last night and the problem has happened again twice
today.

  I'm getting a lot of these in the Apache error log:
--- error_log
[Wed Feb 26 01:22:47 2003] [error] jk2_init() Can't find child 26949 in
scoreboard
[Wed Feb 26 01:22:47 2003] [error] mod_jk child workerEnv in error state 3
[Wed Feb 26 01:22:47 2003] [error] mod_jk child init 1 -2
[Wed Feb 26 01:22:49 2003] [error] mod_jk child workerEnv in error state 3
[Wed Feb 26 01:22:50 2003] [error] mod_jk child workerEnv in error state 3
--- etc..etc
  and a few of these when the site got busier:
---
[Wed Feb 26 10:30:04 2003] [error] Error ajp_process_callback - write failed
[Wed Feb 26 10:30:04 2003] [error] ajp13.service() ajpGetReply
recoverable error 3
[Wed Feb 26 10:30:04 2003] [error] Error ajp_process_callback - write failed
[Wed Feb 26 10:30:04 2003] [error] ajp13.service() ajpGetReply
recoverable error 3
[Wed Feb 26 10:30:04 2003] [error] ajp13.service() Error  forwarding
ajp13:jvm1:8009 1 0
[Wed Feb 26 10:30:04 2003] [error] mod_jk.handler() Error connecting to
tomcat 3
[Wed Feb 26 10:30:13 2003] [error] mod_jk child init 1 0
-- etc etc..
  I'm also seeing a lot of these in the catalina_log on the Tomcat
workers:
--
2003-02-26 09:50:51 Ajp13Processor[8009][133] process: invoke
java.net.SocketException: Socket closed
at java.net.SocketOutputStream.socketWrite0(Native Method)
at
java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:92)
at java.net.SocketOutputStream.write(SocketOutputStream.java:126)
at org.apache.ajp.Ajp13.send(Ajp13.java:525)
at org.apache.ajp.RequestHandler.finish(RequestHandler.java:501)
at org.apache.ajp.Ajp13.finish(Ajp13.java:395)
at
org.apache.ajp.tomcat4.Ajp13Response.finishResponse(Ajp13Response.java:196)
at
org.apache.ajp.tomcat4.Ajp13Processor.process(Ajp13Processor.java:464)
at
org.apache.ajp.tomcat4.Ajp13Processor.run(Ajp13Processor.java:551)
at java.lang.Thread.run(Thread.java:536)
-

  Beyond that, the logs don't tell me much. Anyway, sorry for the huge
length of this e-mail; if anyone has any suggestions it would be a huge
help.

  Thanks!
  -Mike
   netguru at ipudev dot com


 workers2.properties
[shm]
file=/usr/local/apache/logs/shm.file
size=4194304

[channel.socket:jvm2:8009]
port=8009
host=192.168.0.31
group=lb
lb_factor=1
disabled=0
route=jvm2

[channel.socket:jvm1:8009]
port=8009
host=192.168.0.30
group=lb
lb_factor=1
disabled=0
route=jvm1

[channel.socket:jvm3:8009]
port=8009
host=192.168.0.32
group=lb
lb_factor=1
disabled=0
route=jvm3

[channel.socket:jvm4:8009]
port=8009
host=192.168.0.33