使用AWS Lambda自动创建EBS卷快照+自动清除历史快照文件

一、创建IAM策略

　　IAM->策略->创建策略->JSON

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "logs:*"
            ],
            "Resource": "*"
        },
        {
            "Effect": "Allow",
            "Action": "ec2:Describe*",
            "Resource": "*"
        },
        {
            "Effect": "Allow",
            "Action": [
                "ec2:CreateSnapshot",
                "ec2:DeleteSnapshot",
                "ec2:CreateTags",
                "ec2:ModifySnapshotAttribute",
                "ec2:ResetSnapshotAttribute"
            ],
            "Resource": [
                "*"
            ]
        }
    ]
}

二、创建角色

　　IAM->角色->创建角色->添加刚刚创建好的策略

三、编辑Python3脚本，脚本名为“lambda_function.py”

import boto3
import datetime
import os
import pytz

ec2 = boto3.resource('ec2')

def lambda_handler(event, context):
    print("\n\nAWS snapshot backups starting at %s" % datetime.datetime.now())
    instances = ec2.instances.filter(
        Filters=[{'Name': 'instance-state-name', 'Values': ['running']}])
    
    for instance in instances:
        for item in instance.tags:
            if item["Key"] == "Name":
                instance_name = item["Value"]

        for volume in ec2.volumes.filter(Filters=[{'Name': 'attachment.instance-id', 'Values': [instance.id]}]):
            description = '%s-%s-%s' % (instance_name, volume.volume_id, 
                datetime.datetime.now().strftime("%Y%m%d"))
                
            # create ebs snaphost
            if volume.create_snapshot(VolumeId=volume.volume_id, Description=description):
                print("Snapshot created with description [%s]" % description)
            # delete expired snapshot
            for snapshot in volume.snapshots.all():
                # expried datetime
                retention_days = 7
                if datetime.datetime.now().replace(tzinfo=None) - snapshot.start_time.replace(tzinfo=None) > datetime.timedelta(days=retention_days) and int(snapshot.start_time.replace(tzinfo=None).strftime("%Y%m%d")) >= 20181204:
                    print("\t\tDeleting snapshot [%s - %s]" % ( snapshot.snapshot_id, snapshot.description ))
                    try:
                        snapshot.delete()
                    except Exception as err:
                        continue


    print("\n\nAWS snapshot backups completed at %s" % datetime.datetime.now())
    return True

四、打包python脚本以及需要的三方库(Python3)

# mkdir /tmp/lambda_tmp
# mv lambda_function.py /tmp/lambda_tmp/
# pip install pytz -t /tmp/lambda_tmp/ 
# pip install boto3 -t /tmp/lambda_tmp/ 
# cd /tmp/lambda_tmp
# zip -r9 ~/lambda_EBS.zip *

五、创建Lambda函数

Service->Lambda->创建函数