To monitor an instance

1. Use the ec2-monitor-instances command.

   PROMPT>  ec2-monitor-instances instance_id

   Amazon EC2 returns output similar to the following example.

   i-ae0bf0c7  monitoring-pending 

2. The following command displays the monitoring status of the instance.

   PROMPT>  ec2-describe-instances instance_id 
   RESERVATION     r-7430c31d      924417782495    default
   INSTANCE        i-ae0bf0c7      ami-2bb65342    ec2-67-202-7-236.compute-1.amazonaws.com        ip-10-251-31-162.ec2.internal   running gsg-keypair     0               m1.small        2008-03-21T16:19:25+0000us-east-1a    monitoring-enabled