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Listing 18.3 Ant running Ant remotely, via <telnet>
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install-remote: [telnet] Red Hat Linux release 7.1 (Seawolf) [telnet] Kernel 2.4.2-2 on an i686 [telnet] login: [telnet] tomcat4 [telnet] Password: [telnet] [telnet] [tomcat4@eiger tomcat4]$ [telnet] export PS1=[done] [telnet] [done] [telnet] cd /home/tomcat4/install [telnet] [done] [telnet] ant [telnet] Buildfile: build.xml [telnet] init: [telnet] install:
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CHAPTER 1 8
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[telnet] init: [telnet] unload: [telnet] [get] Getting: http://127.0.0.1:8080/manager/remove path=/antbook [telnet] [echo] OK - Removed application at context path /antbook [telnet] clean: [telnet] [delete] Deleting: /home/tomcat4/tomcat4.0/webapps/antbook.war [telnet] [delete] Deleting directory /home/tomcat4/tomcat4.0/webapps/antbook [telnet] install-files: [telnet] [copy] Copying 1 file to /home/tomcat4/tomcat4.0/webapps [telnet] [unzip] Expanding: /home/tomcat4/tomcat4.0/webapps/antbook.war into /home/tomcat4/tomcat4.0/webapps/antbook [telnet] deploy: [telnet] [get] Getting: http://127.0.0.1:8080/manager/install path=/antbook &war=file:///home/tomcat4/tomcat4.0/webapps/antbook [telnet] [echo] OK - Installed application at context path /antbook [telnet] default: [telnet] BUILD SUCCESSFUL [telnet] Total time: 35 seconds [telnet] [done]
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The log shows that Ant has successfully logged in to the remote server, and then run the remote Ant build that it just uploaded. This build file does exactly what it does on a local system: install Ant to the local Tomcat server. If the remote build failed, the local build continues, oblivious to the fact. We could modify the <telnet> task so that it waits for the BUILD SUCCESSFUL string, timing out after a few minutes if it receives a BUILD FAILED message. Instead, we just rely on the functional tests, and a new test we will write in section 18.8. 18.5.9 Reviewing the deployment process This process seems a bit complex, given that we have demonstrated nothing more than deployment to the same two systems we were deploying to in chapter 7. However, look at what we have gained: scalability, flexibility, and some more security. Scalability To add a new server: add two configuration files, one local and one remote; you don t need to touch the build file itself. Developers can easily add their systems to the project without storing passwords in the SCM system, and one single trusted and secured server can keep the details on production systems safe. Flexibility We can now support many different server types. Each one needs its own installation build file, with a default target to install the web application based on the configuration file for the local host, but all the details are left to it. These files can be reused across projects, or they can be customized to perform extra tasks, such as configuring the application server itself.
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Security Perfect security is a distant ideal; if you have a password in a computer, you have a security risk. Our deployment process is amenable to working on secured systems where server controls keep the Tomcat management application inaccessible to all but local callers. It will also work through SSH tunnels, using the passive="true" option on <ftp> and the option to customize ports and servers for <ftp> and <telnet>. We have also gained the ability to work with those operations groups that want to control the process. They can keep the configuration files for their servers on their system, and run the code. We can even deploy via email or CD: just <mail> the deployment files to operations with a please install message, or <copy> the files to a CD-ROM that you can physically hand to them. No matter how the files get to the server, running ant at the command prompt will get the application installed. This is a powerful build process. We have not delved into generating custom WAR files in this task, but the steps are obvious: use the properties in the per-target and perserver configuration files to control <webdoclet> and <war>. You do need to run a clean build on the system when switching targets. Rather than remembering to do this every time, save the target server s name to a properties file in the dist directory. Next build, load, and compare this to the current target. When the server names are different, your build file should trigger a cleanup. Now that we have put our deployment process in place, we will take a brief look at the deployment processes of some different application servers.
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