Install oracle java 7 in ubuntu

If you want to install Oracle Java 7 in ubuntu, you need to execute following commands in terminal

sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java7-installer

Communicating with muliple guest VMs

It's a common use case to have multiple VMs configured in a Virtual Box and be able to communicate to them from host. e.g. you may want to setup tomcat in a two node cluster and be able to access the nodes from the terminal in host machine.

By default, while using Virtual Box, guest VMs can see host but host can not see the guest VMs.

following blog has a very good explanation of how to solve this.

http://christophermaier.name/blog/2010/09/01/host-only-networking-with-virtualbox


 

FATAL: Cannot find sub command for: 'ec2'

I was trying to execute knife command to create ec2 server however i was getting error.


here is the command that i was executing:

$ knife ec2 server create -G default -I ami-7000f019 -f m1.small   -S java-quick-start -i ~/.ssh/java-quick-start.pem -x ubuntu   -r 'role[base],role[dbapp_database_master],role[dbapp],recipe[dbapp::db_bootstrap],role[dbapp_load_balancer]'

this is the error i was getting:

FATAL: Cannot find sub command for: 'ec2 server create -G default -I ami-7000f019 -f m1.small -S java-quick-start -i /home/pankaj/.ssh/java-quick-start.pem -x ubuntu -r role[base],role[dbapp_database_master],role[dbapp],recipe[dbapp::db_bootstrap],role[dbapp_load_balancer]'
The ec2 commands were moved to plugins in Chef 0.10
You can install the plugin with `(sudo) gem install knife-ec2

I continued getting this error even when i installed knife-ec2 using command

gem install knife-ec2

finally it worked when i executed following:

$ /opt/chef/embedded/bin/gem install knife-ec2