Aerospike quiesce script for GCP maintenance events

Based off of Google's own metadata example, this script will drain Aerospike nodes when the node gets a maintenance event.

A maintenance event typically means the VM will be live migrated. This plays havoc with Aerospike. To mitigate the impact, the node will be drained via the asinfo -v quiesce command once a maintenance event is scheduled.

Requirements

python requests 2.20.1 asinfo (from aerospike-tools)

Running

This script should run on every Aerospike node, as maintenance events are local to each VM.

run with nohup:

nohup ./maintenance.py &

Parameters:

usage: maintenance.py [-h] [-o OPTIONS] [-t TIMEOUT] [-p | -n]

optional arguments:
  -h, --help            show this help message and exit
  -o OPTIONS, --options OPTIONS
                        Additional options to pass into asinfo. Can be
                        anything except commands, ie: "-v $COMMAND". Entire
                        string must be quoted, eg: -o="-u admin -p admin"
  -t TIMEOUT, --timeout TIMEOUT
                        Timeout for the Google metadata service in seconds, up
                        to 3600 (default 3600)
  -p, --persist         Persist the last event to file
  -n, --non-persist     Disable persist the last event to file (default)

Example with user/password:

nohup ./maintenance.py -o="-u admin -p admin" &