Saturday, April 12, 2014

Installing Tomcat on OpenShift

In the previous articles we have seen how to deploy a application and configure Database in OpenShift. By default OpenShift supports JBoss 7.In this article we will see how we can configure Tomcat in OpenShift.

Since Tomcat is not an officially support application type on OpenShift, we need to create a DIY application.

You can use your own Languages and Data Stores by talking advantage of OpenShift's powerful Do-It-Yourself (DIY) feature if the built-in Perl, Ruby, PHP, Python, and Java EE6 support doesn't suit you. OpenShift's DIY allows you run just about any program that speaks HTTP.

Create a Tomcat application

[root@vx111a funtest]# rhc app create tomcat diy
Using diy-0.1 (Do-It-Yourself 0.1) for 'diy'

Application Options
-------------------
Domain:     fundomain
Cartridges: diy-0.1
Gear Size:  default
Scaling:    no

Creating application 'tomcat' ... done

  Disclaimer: This is an experimental cartridge that provides a way to try unsupported languages, frameworks, and middleware on OpenShift.

Waiting for your DNS name to be available ... done

Initialized empty Git repository in /soa/openShift/funtest/tomcat/.git/
The authenticity of host 'tomcat-fundomain.rhcloud.com (107.21.128.82)' can't be established.
RSA key fingerprint is cf:ee:77:cb:0e:fc:02:d7:72:7e:ae:80:c0:90:88:a7.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'tomcat-fundomain.rhcloud.com,107.21.128.82' (RSA) to the list of known hosts.

Your application 'tomcat' is now available.

  URL:        http://tomcat-fundomain.rhcloud.com/
  SSH to:     537f5367500446573b00011e@tomcat-fundomain.rhcloud.com
  Git remote: ssh://537f5367500446573b00011e@tomcat-fundomain.rhcloud.com/~/git/tomcat.git/
  Cloned to:  /soa/openShift/funtest/tomcat

Run 'rhc show-app tomcat' for more details about your app.

This will create a application named tomcat and will also inform OpenShift that we are using DIY type application and will plan to install tomcat on OpenShift.


By default diy cartridge has a ruby server installed, which can be stop/start using start and stop scripts. Navigate into the tomcat application in the local repository,

[root@vx111a funtest]# ll
drwxr-xr-x. 6 root root 4096 May 23 23:56 dbtest
drwxr-xr-x. 6 root root 4096 May 23 22:12 funtest
drwxr-xr-x. 6 root root 4096 May 24 00:57 tomcat
[root@vx111a funtest]# cd tomcat/

 [root@vx111a tomcat]# ls -alrt
drwxr-xr-x. 5 root root 4096 May 24 00:56 ..
-rw-r--r--. 1 root root  169 May 24 00:57 README.md
drwxr-xr-x. 4 root root 4096 May 24 00:57 .openshift
drwxr-xr-x. 2 root root 4096 May 24 00:57 misc
drwxr-xr-x. 2 root root 4096 May 24 00:57 diy
drwxr-xr-x. 6 root root 4096 May 24 00:57 .
drwxr-xr-x. 8 root root 4096 May 24 00:57 .git

[root@vx111a tomcat]# cd .openshift/

[root@vx111a .openshift]# ls -alrt
drwxr-xr-x. 7 root root 4096 May 24 00:57 cron
drwxr-xr-x. 2 root root 4096 May 24 00:57 action_hooks
drwxr-xr-x. 4 root root 4096 May 24 00:57 .
drwxr-xr-x. 6 root root 4096 May 24 00:57 ..

The action_hooks is the place where the scripts exist.
[root@vx111a .openshift]# cd action_hooks/

[root@vx111a action_hooks]# ls
README.md  start  stop

To disable the ruby server Stop the tomcat
[root@vx111a action_hooks]# rhc app stop -a tomcat
RESULT:
tomcat stopped

[root@vx111a action_hooks]# ll
total 12
-rw-r--r--. 1 root root 171 May 24 00:57 README.md
-rwxr-xr-x. 1 root root 280 May 24 00:57 start
-rwxr-xr-x. 1 root root 339 May 24 00:57 stop

Remove the start and stop files
[root@vx111a action_hooks]# rm start
rm: remove regular file `start'? y
[root@vx111a action_hooks]# rm stop
rm: remove regular file `stop'? y

Now create the files again and push them to the repository with git
[root@vx111a action_hooks]# touch start
[root@vx111a action_hooks]# touch stop

Commit the files with Git
[root@vx111a action_hooks]# git commit -a -m "Replaces start and Stop Scripts"
[master 5c81663] Replaces start and Stop Scripts
 Committer: root <root@vx111a.jas.com>
Your name and email address were configured automatically based
on your username and hostname. Please check that they are accurate.
You can suppress this message by setting them explicitly:

    git config --global user.name "Your Name"
    git config --global user.email you@example.com

If the identity used for this commit is wrong, you can fix it with:

    git commit --amend --author='Your Name <you@example.com>'

 2 files changed, 0 insertions(+), 15 deletions(-)
 mode change 100755 => 100644 .openshift/action_hooks/start
 mode change 100755 => 100644 .openshift/action_hooks/stop
                                                         
[root@vx111a action_hooks]# git push
Counting objects: 7, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (4/4), done.
Writing objects: 100% (4/4), 499 bytes, done.
Total 4 (delta 0), reused 0 (delta 0)
remote: Stopping DIY cartridge
remote: CLIENT_RESULT: Application is already stopped
remote: Building git ref 'master', commit 5c81663
remote: Preparing build for deployment
remote: Deployment id is a5448020
remote: Activating deployment
remote: Starting DIY cartridge
remote: -------------------------
remote: Git Post-Receive Result: success
remote: Activation status: success
remote: Deployment completed with status: success
To ssh://537f5367500446573b00011e@tomcat-fundomain.rhcloud.com/~/git/tomcat.git/
   f2b1a44..5c81663  master -> master

Now we disabled the Ruby server that comes by default with DIY application.

Download and Install Tomcat

Check the domain and get the details regarding the tomcat application

[root@vx111a action_hooks]# rhc domain show
Domain fundomain (owned by jagadesh.manchala@gmail.com)
-------------------------------------------------------
  Created:            May 22  5:19 PM
  ID:                 537de4445973ca6cf70000b2
  Allowed Gear Sizes: small

  tomcat @ http://tomcat-fundomain.rhcloud.com/ (uuid: 537f5367500446573b00011e)
  ------------------------------------------------------------------------------
    Domain:     fundomain
    Created:    May 23  7:25 PM
    Gears:      1 (defaults to small)
    Git URL:    ssh://537f5367500446573b00011e@tomcat- fundomain.rhcloud.com/~/git/tomcat.git/
    SSH:        537f5367500446573b00011e@tomcat-fundomain.rhcloud.com
    Deployment: auto (on git push)

    diy-0.1 (Do-It-Yourself 0.1)
    ----------------------------
      Gears: 1 small

Ssh to the tomcat application and navigate to OPENSHIFT_DATA_DIR location

cd $OPENSHIFT_DATA_DIR
wget http://apache.mesi.com.ar/tomcat/tomcat-7/v7.0.53/bin/apache-tomcat-7.0.53.tar.gz
tar zvf apache-tomcat-7.0.53.tar.gz
tar xvf apache-tomcat-7.0.53.tar.gz
cd apache-tomcat-7.0.3

Now that we tomcat downloaded and extracted, we need to modify the server.xml file to specify the ports we want to use as well as the ip address to bind to. Because OpenShift is a multitenant environment, you will need to use the internal ip address that is provided to you. In order to find this address, run the following command:

$ env | grep INTERNAL_IP

if this does not give any IP address , we can use /sbin/ifconfig by which we can get the IP address

Now make these changes to the server.xml ,

Change the Server shutdown port : <Server port="15005" shutdown="SHUTDOWN">

Add the IP address obtained to the HTTP Connector
    <Connector port="8080" protocol="HTTP/1.1" address="10.171.23.252"
               connectionTimeout="20000"
               redirectPort="8443" />

Change the AJP port value too
    <Connector port="15009" protocol="AJP/1.3" redirectPort="8443" />

Change the address for the default host name
    <Engine name="Catalina" defaultHost="10.171.23.252">

Change the address in Host name too
      <Host name="10.171.23.252"  appBase="webapps"
            unpackWARs="true" autoDeploy="true">

Save the File once changes are done.

Now we need to make changes to the tomcat-user.xml file so that we can enable some users for logging into the tomcat console.

Add these lines to the tomcat-user.xml file

<role rolename="manager-gui"/>
<user username="tomcat" password="tomcat" roles="manager-gui"/>

Save the file

Start the tomcat
cd bin
sh startup.sh

[tomcat-fundomain.rhcloud.com bin]\> sh ./startup.sh
Using CATALINA_BASE:   /var/lib/openshift/537f5367500446573b00011e/app-root/data/apache-tomcat-7.0.53
Using CATALINA_HOME:   /var/lib/openshift/537f5367500446573b00011e/app-root/data/apache-tomcat-7.0.53
Using CATALINA_TMPDIR: /var/lib/openshift/537f5367500446573b00011e/app-root/data/apache-tomcat-7.0.53/temp
Using JRE_HOME:        /usr
Using CLASSPATH:       /var/lib/openshift/537f5367500446573b00011e/app-root/data/apache-tomcat-7.0.53/bin/bootstrap.jar:/var/lib/openshift/537f5367500446573b00011e/app-root/data/apache-tomcat-7.0.53/bin/tomcat-juli.jar
Tomcat started.

Once we start the tomcat ,we can access it using the
http://tomcat-fundomain.rhcloud.com/manager/html


More to come , Happy Learning :-)

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