TODO
- EC2のイベント対応で夜間に自動停止・起動
- インスタンスタイプを夜間に自動更新
内容
tag
- Key=Schedule, Value= [1:予約あり, 0:予約実行完了]
- オプション
例）t3.microに変更
Key=InstanceType, Value=t3.micro
EventBridge
- 例）毎週木曜日0時に処理
cron(0 15 ? * WED *)
Lambda
lambda_handler Python3.9
import boto3
import json
import pprint
def lambda_handler(event, context):
cnt = 0
log_msg = []
task_tag = 'Schedule'
client = boto3.client('ec2')
reservations = client.describe_instances(
Filters=[{
'Name': f'tag:{task_tag}',
'Values': ['1']
}]
)
for reservation in reservations['Reservations']:
for instance in reservation['Instances']:
cnt = cnt + 1
new_instance_type = ''
inst_id = instance['InstanceId']
instance_type = instance['InstanceType']
state_name = instance['State']['Name']
for tag in instance['Tags']:
if tag['Key'] == 'InstanceType':
new_instance_type = tag['Value']
break
log_msg.append(f"{inst_id}, {state_name}, {instance_type}, {new_instance_type}")
if state_name == 'running':
response = client.stop_instances(InstanceIds=[inst_id])
log_msg.extend(response)
#停止まで待機
waiter = client.get_waiter('instance_stopped')
waiter.wait(InstanceIds=[inst_id])
#インスタンスタイプ変更があると処理
if new_instance_type and new_instance_type != instance_type:
response = client.modify_instance_attribute(InstanceId=inst_id, Attribute='instanceType', Value=new_instance_type)
#重複処理防止のため、処理完了とのタグ値更新
response_tag = client.delete_tags(
Resources=[inst_id],
Tags=[{'Key': task_tag, 'Value': '1'}],
)
response_tag = client.create_tags(
Resources=[inst_id],
Tags=[{'Key': task_tag, 'Value': '0'}],
)
log_msg.extend(response_tag)
response = client.start_instances(InstanceIds=[inst_id])
log_msg.extend(response)
log_msg.append(f'instance count: {cnt}')
pprint.pprint(log_msg)
return {
'statusCode': 200,
'body': json.dumps('ok')
}