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Author Topic: Integrate Apache httpd with Tomcat on AWS EC2 instance
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  posted on: 10/21/2011 12:51:40 AM    Edit  |   Quote  |   Report 
Integrate Apache httpd with Tomcat on AWS EC2 instance

Now that we have Apache httpd and Tomcat, it's time to put them work together. The whole point here is to:

1) Apache httpd to handle multiple websites.
2) Apache httpd to handle static contents.
3) Tomcat server to handle dynamical contents.


                        -------              --------
   www.exmaple1.com ---|       |            |        |
                       |       |            |        |
                       | httpd |------------| tomcat |
   www.exmaple2.com ---|       |            |        |
                       |_______|            |________|
                           ^                    ^
                           |                    |
                           |                    |

                        static contents    dynamical contents



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  posted on: 10/21/2011 01:12:07 AM    Edit  |   Quote  |   Report 
Install Apache mod_jk
                        -------              --------
   www.exmaple1.com ---|       |            |        |
                       |       |  mod_jk    |        |
                       | httpd |------------| tomcat |
   www.exmaple2.com ---|       |            |        |
                       |_______|            |________|
                           ^                    ^
                           |                    |
                           |                    |

                        static contents    dynamical contents


1. Install httpd-devel
# yum install httpd-devel



2. Install all c/c++ complier and builder
# yum install gcc gcc-c++ libtool libxml2-devel


3. Download, make and install mod_jk
$ cd /home/ec2-user
$ mkdir mod_jk
$ cd mod_jk
$ curl http://apache.osuosl.org//tomcat/tomcat-connectors/jk/
tomcat-connectors-1.2.32-src.tar.gz > tomcat-connectors-1.2.32-src.tar.gz
$ tar xzf tomcat-connectors-1.2.32-src.tar.gz
$ cd tomcat-connectors-1.2.32-src/native
$ ./configure --with-apxs=/usr/sbin/apxs
$ make
$ sudo make install


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  posted on: 10/21/2011 01:57:12 AM    Edit  |   Quote  |   Report 
Configure Apache mod_jk
1. Configure connector
$ sudo vi /etc/httpd/conf/workers.properties

 # Define the list of workers that will be used
 worker.list=worker1

 # Define worker1
 worker.worker1.port=8009
 worker.worker1.host=localhost
 worker.worker1.type=ajp13

Save and close the file.

2. Configure httpd 
# Load mod_jk module
LoadModule    jk_module  /usr/lib/httpd/modules/mod_jk.so

# Where to find workers.properties
JkWorkersFile /etc/httpd/conf/workers.properties

# Where to put jk shared memory
JkShmFile     /var/log/httpd/mod_jk.shm

# Where to put jk logs
JkLogFile     /var/log/httpd/mod_jk.log

# Set the jk log level [debug/error/info]
JkLogLevel    info

# Select the timestamp log format
JkLogStampFormat "[%a %b %d %H:%M:%S %Y] "

# Send servlet for context /examples to worker named worker1
JkMount  /examples/servlets/* worker1
# Exclude the static files                      
JkUnMount /examples/servlets/*.jpg  worker1
JkUnMount /examples/servlets/*.gif  worker1

# Send JSPs  for context /examples to worker named worker1
JkMount  /examples/*.jsp worker1


3. Configure httpd -- VirtualHost 
<VirtualHost *:80>
  ServerName example2.com
  ServerAlias www.example2.com
  DocumentRoot /home/ec2-user/example2.com/html
  SuexecUserGroup ec2-user ec2-user

  <Directory /home/ec2-user/example2.com/html>
    Options Indexes Includes FollowSymLinks
    AllowOverride All
  </Directory>

# Send servlet for context /examples to worker named worker1
JkMount  /examples/servlets/* worker1

# Send JSPs  for context /examples to worker named worker1
JkMount  /examples/*.jsp worker1

</VirtualHost>

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  posted on: 10/26/2011 12:52:23 AM    Edit  |   Quote  |   Report 
Who should go online first, Apache httpd or Tomcat?
Always start or restart Tomcat first, then Apache httpd.
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  posted on: 11/02/2011 07:12:46 PM    Edit  |   Quote  |   Report 
Integrate Apache httpd with Tomcat plus failover


                        -------              ----------
   www.exmaple1.com ---|       |            |          |
                       |       |  mod_jk    |  tomcat  |
                       | httpd |------------|(primary) |
   www.exmaple2.com ---|       |         |  |          |
                       |_______|         |  |__________|
                                         |
                                         |   ----------
                                         |  |          | 
                                         |  |  tomcat  |
                                         |--|(failover)|
                                            |          |
                                            |__________|


A load balancer is a worker that does not directly communicate with Tomcat. Instead it is responsible for the management of several "real" workers, called members or sub workers of the load balancer.

A practical example given here is to use loadbalancer to provide high-availability service with a failover tomcat server.

  # The dvanced router LB worker
  worker.list=router
  worker.router.type=lb
  worker.router.balance_workers=worker1,worker2

  # Define the first member worker
  worker.worker1.type=ajp13
  worker.worker1.host=myhost1
  worker.worker1.port=8009
  # Define preferred failover node for worker1
  worker.worker1.redirect=worker2

  # Define the second member worker
  worker.worker2.type=ajp13
  worker.worker2.host=myhost2
  worker.worker2.port=8009
  # Disable worker2 for all requests except failover
  worker.worker2.activation=disabled


The redirect flag on worker1 tells the load balancer to redirect the requests to worker2 in case that worker1 has a problem. In all other cases worker2 will not receive any requests, thus acting like a hot standby.

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  posted on: 08/30/2012 02:43:24 PM    Edit  |   Quote  |   Report 
Side notes for mod_jk installation 64-bit
1) Always get the latest version
$ cd /home/ec2-user
$ mkdir mod_jk
$ cd mod_jk
$ curl http://apache.osuosl.org/tomcat/tomcat-connectors/jk/
tomcat-connectors-1.2.37-src.tar.gz > tomcat-connectors-1.2.37-src.tar.gz
$ tar xzf tomcat-connectors-1.2.37-src.tar.gz
$ cd tomcat-connectors-1.2.37-src/native
$ ./configure --with-apxs=/usr/sbin/apxs
$ make
$ sudo make install



2) $ make may return 'make not found'

You may have to install first by
# yum install make



3) The install may change the location depending on your OS

For 32-bit: /usr/lib/httpd/modules/mod_jk.so
For 64-bit: /usr/lib64/httpd/modules/mod_jk.so



4) Accordingly, a working httpd.conf 
# vi /etc/httpd/conf/httpd.conf


# Load mod_jk module
LoadModule    jk_module  /usr/lib64/httpd/modules/mod_jk.so

# Where to find workers.properties
JkWorkersFile /etc/httpd/conf/workers.properties

# Where to put jk shared memory
JkShmFile     /var/log/httpd/mod_jk.shm

# Where to put jk logs
JkLogFile     /var/log/httpd/mod_jk.log

# Set the jk log level [debug/error/info]
JkLogLevel    info

# Select the timestamp log format
JkLogStampFormat "[%a %b %d %H:%M:%S %Y] "

<VirtualHost *:80>
  ServerName example1.com
  ServerAlias www.example1.com
  DocumentRoot /home/ec2-user/example1.com/html
  SuexecUserGroup ec2-user ec2-user

  <Directory /home/ec2-user/example1.com/html>
    Options Indexes Includes FollowSymLinks
    AllowOverride All
  </Directory>

# Send servlet for context /examples to worker named worker1
  JkMount  /examples/servlets/* worker1

# Send JSPs  for context /examples to worker named worker1
  JkMount  /examples/*.jsp worker1

</VirtualHost>



# /etc/init.d/httpd start
Starting httpd:                                            [  OK  ]

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  posted on: 05/12/2016 01:34:26 AM    Edit  |   Quote  |   Report 
Sundomain mapping with Apache httpd and Tomcat
Here comes the requirement

Two or more subdomains:
     
                        -------              ----------
   news.exmaple.com ---|       |            |          |
                       |       |  mod_jk    |  tomcat  |
    www.exmaple.com ---| httpd |------------|          |
                       |       |            |          |
   blog.exmaple.com ---|_______|            |----------|
                                                 |
                                                 |           
                                                 |-[+] webapps                             
                                                 |---[+] news
                                                 |---[+] blog
                                                 |---[+] main


Desired Mapping:
main domain:
   www.exmaple.com/main -->  /webapps/main
   www.exmaple.com/blog -->  /webapps/blog
   www.exmaple.com/news -->  /webapps/news
subdomain news:
   news.exmaple.com     -->  /webapps/news
subdomain blog:
   blog.exmaple.com     -->  /webapps/blog


Here comes the solution

httpd.conf
<VirtualHost *:80>
  ServerName exmaple.com
  ServerAlias www.exmaple.com

  <Directory /home/ec2-user/exmaple.com/html>
    Options Indexes Includes FollowSymLinks
    AllowOverride All
  </Directory>

  JkMount  /main worker1
  JkMount  /news worker1
  JkMount  /blog worker1
  JkUnMount  /*.html worker1
</VirtualHost>


<VirtualHost *:80>
  ServerName news.example.com
  <Directory /home/ec2-user/news.exmaple.com/html>
    Options Indexes Includes FollowSymLinks
    AllowOverride All
  </Directory>
  JkMount  / worker1
  JkMount  /* worker1
  JkUnMount  /*.html worker1
</VirtualHost>

<VirtualHost *:80>
  ServerName blog.example.com
  <Directory /home/ec2-user/blog.exmaple.com/html>
    Options Indexes Includes FollowSymLinks
    AllowOverride All
  </Directory>
  JkMount  / worker1
  JkMount  /* worker1
  JkUnMount  /*.html worker1
</VirtualHost>


Tomcat server.xml
 <Host name="news.example.com"  appBase="webapps"
        unpackWARs="true" autoDeploy="true">

   <Context docBase="/env/.../webapps/news" path="/" reloadable="true"/>

 </Host>

 <Host name="blog.example.com"  appBase="webapps"
        unpackWARs="true" autoDeploy="true">

   <Context docBase="/env/.../webapps/blog" path="/" reloadable="true"/>

 </Host>

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