AWS Elastic Network Interface & Elastic IP Address Assigner
Project description
This utility lets you define a pool of Amazon Elastic Network Interfaces and Elastic IP Addresses and instance tag filter criteria.
When run it will:
find instances that match the criteria
attach any spare Elastic Network Interface to any matched running instance which does not have one from the set you defined
attach any spare Elastic IP Addresses to any matched running instance which does not have one from the set you defined
When an instance is terminated AWS detaches the Elastic Network Interface or Elastic IP Address for you automatically.
This requires environment variables or an IAM Role to be assigned to the machine it is being run on.
Depends on boto (2.38.0) and so requires Python 2.7 and is installable from PyPI with pip install eniarbiter.
Sample Config:
{
"region": "ap-southeast-2",
"eni_list": ["eni-913c08e6", "eni-9d3c08ea", "eni-d33c08a4", "eni-cd3e0aba"],
"ip_list": ["222.15.158.2", "74.89.251.77", "10.126.147.95", "115.69.216.207", "52.124.77.212"],
"instance_tag_spec": {
"tag:aws:autoscaling:groupName": "cs-TEST",
"tag:Availability": "{\"availability\": \"24x7\"}"
}
}
The variables eni_list and ip_list may be omitted if you do not require that functionality.
Running
After activating your virtualenv, run eniarbiter {CONFIG}, e.g.:
(eniarbiter)[chris@tripparch eniarbiter]$ eniarbiter config.json 2015-04-14 23:06:52,121 - INFO - Connecting to AWS... 2015-04-14 23:06:52,123 - INFO - Retrieving ENIs... 2015-04-14 23:06:52,821 - INFO - 3 available ENIS 2015-04-14 23:06:52,954 - INFO - 3 running matching instances 2015-04-14 23:06:52,954 - INFO - Attaching interface eni-cd3e0aba to instance i-07c46dc9 as eth1 2015-04-14 23:06:53,180 - INFO - Attaching interface eni-9d3c08ea to instance i-b4c46d7a as eth1 2015-04-14 23:06:53,389 - INFO - Instance i-1fc56cd1 already has a specified ENI attached
And if you immediately re-run you will see that the ENIs are attached and available count has reduced:
(eniarbiter)[chris@tripparch eniarbiter]$ eniarbiter config.json 2015-04-14 23:07:05,039 - INFO - Connecting to AWS... 2015-04-14 23:07:05,041 - INFO - Retrieving ENIs... 2015-04-14 23:07:05,436 - INFO - 1 available ENIS 2015-04-14 23:07:05,748 - INFO - 3 running matching instances 2015-04-14 23:07:05,749 - INFO - Instance i-07c46dc9 already has a specified ENI attached 2015-04-14 23:07:05,749 - INFO - Instance i-b4c46d7a already has a specified ENI attached 2015-04-14 23:07:05,749 - INFO - Instance i-1fc56cd1 already has a specified ENI attached (eniarbiter)[chris@tripparch eniarbiter]$
There is also a Dry Run mode (--dry-run or -c):
(eniarbiter)[chris@tripparch eniarbiter]$ eniarbiter config.json -c 2015-04-14 23:06:39,959 - INFO - Connecting to AWS... 2015-04-14 23:06:39,961 - INFO - Retrieving ENIs... 2015-04-14 23:06:40,174 - INFO - 3 available ENIS 2015-04-14 23:06:40,316 - INFO - 3 running matching instances 2015-04-14 23:06:40,317 - INFO - Propose attching interface eni-cd3e0aba to instance i-07c46dc9 as eth1 2015-04-14 23:06:40,317 - INFO - Propose attching interface eni-9d3c08ea to instance i-b4c46d7a as eth1 2015-04-14 23:06:40,317 - INFO - Instance i-1fc56cd1 already has a specified ENI attached
Setup from source
Create virtualenv:
mkvirtualenv -p `which python2.7` eni_arbiter
Or activate existing virtualenv:
workon eni_arbiter
Then install:
python setup.py install
For development I suggest you do a pip install -r requirements-dev.txt.
Initially created April 2015 by Chris Speck | Web | Github
Licensed under the GPLv3
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