0g-chain/.github/scripts/put-all-chain-nodes-on-standby.sh

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#!/bin/bash
set -x
# get all the node's ec2 instance ids for the specified chain id
chain_node_instance_ids=$(aws ec2 describe-instances --filters "Name=tag:KavaChainId,Values=$CHAIN_ID" | jq -r '[.Reservations | .[] | .Instances | .[] | .InstanceId] | join(" ")')
for chain_node_instance_id in ${chain_node_instance_ids}
do
autoscaling_group_state=$(aws autoscaling describe-auto-scaling-instances --instance-ids "$chain_node_instance_id" | jq -r '[.AutoScalingInstances | .[].LifecycleState] | join(" ")')
# Possible states: https://docs.aws.amazon.com/autoscaling/ec2/userguide/ec2-auto-scaling-lifecycle.html
case "$autoscaling_group_state" in
InService)
# place the nodes on standby so they won't get terminated
# by the autoscaling group during the time
# they are offline for a deploy / upgrade
autoscaling_group_name=$(aws autoscaling describe-auto-scaling-instances --instance-ids "$chain_node_instance_id" | jq -r '[.AutoScalingInstances | .[].AutoScalingGroupName] | join(" ")')
aws autoscaling enter-standby \
--instance-ids "$chain_node_instance_id" \
--auto-scaling-group-name "$autoscaling_group_name" \
--should-decrement-desired-capacity
;;
*)
echo "instance ($chain_node_instance_id) not in an elgible state ($autoscaling_group_state) for going on standby, skipping"
;;
esac
done