AWS Auto Scaling

### System environment settings ###

In Your bashrc: 
export AWS_AUTO_SCALING_HOME=/data/aws-keys/as
export AWS_CREDENTIAL_FILE=/data/aws-keys/as/credential-file-path.template

I believe you already have JAVA_HOME :)

And for AutoScaling cmd API location:
http://ec2-downloads.s3.amazonaws.com/AutoScaling-2011-01-01.zip

You can also go to the following link to get the above command location:
http://docs.aws.amazon.com/AutoScaling/latest/DeveloperGuide/UsingTheCommandLineTools.html#setting-up-your-tools

Go to above link, and select Auto Scaling Command Line Tools To get the following location.

http://aws.amazon.com/developertools/2535?_encoding=UTF8&jiveRedirect=1


#### Starting Auto scalling sample ####

amit@amitAsus:~$ as-create-launch-config MyCmdASLaunchConfig --image-id <Your ami> --instance-type m1.small
OK-Created launch config

amit@amitAsus:~$ as-describe-launch-configs 
LAUNCH-CONFIG  MyCmdASLaunchConfig  <Your ami>  m1.small


NOTE: Do not forget to provide at-least the security group and the key information.

amit@amitAsus:~$ as-create-auto-scaling-group MyCmdASGroup --launch-configuration MyCmdASLaunchConfig --availability-zones us-east-1e --min-size 1 --max-size 2 --desired-capacity 1
OK-Created AutoScalingGroup

amit@amitAsus:~$ as-describe-auto-scaling-groups
AUTO-SCALING-GROUP  MyCmdASGroup  MyCmdASLaunchConfig  us-east-1e  1  2  1  Default
INSTANCE  i-b94ac699  us-east-1e  InService  Healthy  MyCmdASLaunchConfig

amit@amitAsus:~$ as-describe-auto-scaling-groups --headers
AUTO-SCALING-GROUP  GROUP-NAME    LAUNCH-CONFIG        AVAILABILITY-ZONES  MIN-SIZE  MAX-SIZE  DESIRED-CAPACITY  TERMINATION-POLICIES
AUTO-SCALING-GROUP  MyCmdASGroup  MyCmdASLaunchConfig  us-east-1e          1         2         1                 Default             
INSTANCE  INSTANCE-ID  AVAILABILITY-ZONE  STATE      STATUS   LAUNCH-CONFIG
INSTANCE  i-b94ac699   us-east-1e         InService  Healthy  MyCmdASLaunchConfig

amit@amitAsus:~$ as-describe-auto-scaling-instances 
INSTANCE  i-b94ac699  MyCmdASGroup  us-east-1e  InService  HEALTHY  MyCmdASLaunchConfig


######## For deleting #######


If you have not updated the Auto-scaling-group to have min 0 then you will get the following error:
amit@amitAsus:~$ as-delete-auto-scaling-group MyCmdASGroup
    
    Are you sure you want to delete this AutoScalingGroup? [Ny]y
as-delete-auto-scaling-group:  Malformed input-You cannot delete an AutoScalingGroup while there are instances
 or pending Spot instance request(s) still in the group.
Usage:
as-delete-auto-scaling-group
        AutoScalingGroupName [--force-delete  ]  [General Options]
For more information and a full list of options, run "as-delete-auto-scaling-group --help"


IMP: NOTE: If the user wants to terminate all the instances, first update the Auto Scaling group with the following command: [ To have min-size '0' ]

amit@amitAsus:~$ as-update-auto-scaling-group MyCmdASGroup --min-size 0
OK-Updated AutoScalingGroup


amit@amitAsus:~$ as-describe-auto-scaling-groups 
AUTO-SCALING-GROUP  MyCmdASGroup  MyCmdASLaunchConfig  us-east-1e  0  2  1  Default
INSTANCE  i-b94ac699  us-east-1e  InService  Healthy  MyCmdASLaunchConfig
amit@amitAsus:~$ as-describe-auto-scaling-groups --headers
AUTO-SCALING-GROUP  GROUP-NAME    LAUNCH-CONFIG        AVAILABILITY-ZONES  MIN-SIZE  MAX-SIZE  DESIRED-CAPACITY  TERMINATION-POLICIES
AUTO-SCALING-GROUP  MyCmdASGroup  MyCmdASLaunchConfig  us-east-1e          0         2         1                 Default             
INSTANCE  INSTANCE-ID  AVAILABILITY-ZONE  STATE      STATUS   LAUNCH-CONFIG
INSTANCE  i-b94ac699   us-east-1e         InService  Healthy  MyCmdASLaunchConfig

# Now terminate the instance in auto-scaling-group:

INPUT EXAMPLES

    Terminates instance 'i-1' and decrements group size.
    $PROMPT> as-terminate-instance-in-auto-scaling-group i-1 --decrement-desired-capacity     
Terminates instance 'i-2' but does not decrement the group size.
    $PROMPT> as-terminate-instance-in-auto-scaling-group i-2 --no-decrement-desired-capacity     

amit@amitAsus:~$ as-terminate-instance-in-auto-scaling-group i-b94ac699 --decrement-desired-capacity
    
    Are you sure you want to terminate this instance?  [Ny]y
INSTANCE  2d7fc3b8-e725-4b4e-b433-9364f5e6fabe  InProgress  At 2013-12-31T18:48:53Z instance i-b94ac699 was taken out of service in response to a user request, shrinking the capacity from 1 to 0.

# Now you can delete the auto-scaling group:
amit@amitAsus:~$ as-delete-auto-scaling-group MyCmdASGroup
    
    Are you sure you want to delete this AutoScalingGroup? [Ny]y
OK-Deleted AutoScalingGroup
amit@amitAsus:~$ as-describe-auto-scaling-groups 
AUTO-SCALING-GROUP  MyCmdASGroup  MyCmdASLaunchConfig  us-east-1e  0  0  0  Default

amit@amitAsus:~$ as-describe-auto-scaling-instances 
No instances found

amit@amitAsus:~$ as-describe-auto-scaling-groups 
No AutoScalingGroups found

amit@amitAsus:~$ as-describe-launch-configs 
LAUNCH-CONFIG  MyCmdASLaunchConfig  ami-f5381c9c  m1.small

amit@amitAsus:~$ as-delete-launch-config MyCmdASLaunchConfig
    
    Are you sure you want to delete this launch configuration? [Ny]y
OK-Deleted launch configuration


amit@amitAsus:~$ as-describe-launch-configs 
No launch configurations found

NOTE: On Scripting, you might need to wait for some time after issuing few commands because, it takes some time, to give you rest of the information of do a recheck of the expected command out-out. Few Ref Link:
http://docs.aws.amazon.com/AutoScaling/latest/DeveloperGuide/WhatIsAutoScaling.html
http://docs.aws.amazon.com/AutoScaling/latest/DeveloperGuide/US_BasicSetup.html
http://www.newvem.com/how-to-create-update-and-delete-an-aws-auto-scaling-group/