VMware's new Cloud Foundry PaaS offering was released in beta recently and appears to be a great option for Grails developers. Peter Ledbrook, Grails project developer and co-author of Grails in Action, has written two posts on the subject. The first provides a one step deployment instructions and the second more in depth example of an app that uses both MySQL and MongoDB.
And there's a Grails Plugin for Cloud Foundry that appears to make for simple deployment of Grails apps.
On receiving my Cloud Foundry sign-up email I downloaded the installation pdf. The current instructions walk through the deployment of a simple Ruby application but never tells you to change your password. I'm not interested in Ruby and just want to change my password and move on to a Grails deployment so I performed the following steps:
$ sudo apt‐get install ruby‐full
$ sudo apt-get install rubygems
$ sudo gem install vmc
$ vmc target api.cloudfoundry.com
$ vmc login
Successfully logged into [http://api.cloudfoundry.com]
$ vmc passwd
Changing password for 'firstname.lastname@example.org'
New Password: ********
Verify Password: ********
Now that we've logged in and reset our password, it's time to deploy a grails application. I'm going to choose an application of mine that's in a stable state but that I've only run in development mode.
I'm going to follow Ledbrook's instructions from here. The first step is to install the Cloud Foundry plug-in for Grails:
$ grails install-plugin cloud-foundry
Edit the $HOME/.grails/settings.groovy file and add your credentials. I had to create this file on my
grails.plugin.cloudfoundry.username = ""
grails.plugin.cloudfoundry.password = " "
Verify that your credentials are working with the following command and you should receive a short summary of your account:
$ grails cf-info
Ignoring possible issues with the DataSource.groovy configuration, let's deploy the application directly to Cloud Foundry with this command:
$ grails cf-push
You'll be prompted for your application URL which my or may not be available. I lucked out and my app's existing name was available.
Application Deployed URL: 'ipadBackup.cloudfoundry.com'?
Would you like to create and bind a mysql service? ([y], n)
Service 'mysql-xxxxxxx' provisioned.
Creating application ipadBackup at ipadBackup.cloudfoundry.com with 512MB and services [mysql-xxxxxxx]: OK
Checking for available resources: OK
Processing resources: OK
Packing application: OK
Uploading (5M): OK
Trying to start Application: 'ipadBackup'.
Application 'ipadBackup' started.
If the URL is not available, you can override your Grails application name and specify another URL with the --appname option:
grails cf-push --appname=ipadAppUsage
I was surprised to find that my app's web page came up immediately. No MySQL credentials were required and no modifications to DataSource.groovy. Magic!
Almost, I have a hardcoded directory path that I had to change. I corrected the path and executed the following commands to update the application:
$ grails cf-update
Documentation on the Grails Cloud Foundry plug-in can be found here. I'm impressed with the ease of deployment to Cloud Foundry. I think their main issue is capacity.
I regularly have problems with CloudFoundry when trying to update my application with the cf-update command. I found this support posting helpful and am using the following steps to update the app when CloudFoundry is less than responsive:
$ grails cf-update
When the WAR file is generated make a copy of it while cf-update is trying to upload it to CloudFoundry. When the cf-update fails, execute the vmc update command to push your war file. I'm also running into memory issues with my app (discovered via the 'vmc crashlogs <appname>' command which showed that my app was shutdown for requesting more than 512M of memory
$ cp <appdir>/target/*.war <appdir>/target/myapp.war
$ vmc update <appname>
$ vmc mem <appname>