EC2: Waiting until a new instance is in running state

Question

I would like to create a new instance based on my stored AMI.

I achieve this by the following code:

RunInstancesRequest rir = new RunInstancesRequest(ima         


        

Answer 1

From the AWS CLI changelog for v1.6.0:

Add a wait subcommand that allows for a command to block until an AWS resource reaches a given state (issue 992, issue 985)

I don't see this mentioned in the documentation, but the following worked for me:

aws ec2 start-instances --instance-ids "i-XXXXXXXX"
aws ec2 wait instance-running --instance-ids "i-XXXXXXXX"

The wait instance-running line did not finish until the EC2 instance was running.

I don't use Python/boto/botocore but assume it has something similar. Check out waiter.py on Github.