boto3 搜索未使用的安全组

Question

我正在使用 AWS Python SDK Boto3，我想知道哪些安全组未被使用。我用 boto2 做到了，但我不知道如何用 boto3 做同样的事情。

from boto.ec2.connection import EC2Connection
from boto.ec2.regioninfo import RegionInfo
import boto.sns
import sys
import logging
from security_groups_config import config

# Get settings from config.py
aws_access_key = config['aws_access_key']
aws_secret_key = config['aws_secret_key']    
ec2_region_name = config['ec2_region_name']
ec2_region_endpoint = config['ec2_region_endpoint']

region = RegionInfo(name=ec2_region_name, endpoint=ec2_region_endpoint)

if aws_access_key:
    conn = EC2Connection(aws_access_key, aws_secret_key, region=region)
else:
    conn = EC2Connection(region=region)

sgs = conn.get_all_security_groups()

## Searching unused SG if the instances number is 0
def search_unused_sg(event, context):
    for sg in sgs:
        print sg.name, len(sg.instances())

Answer 1

首先，我建议你重新看看boto3是如何处理凭证的。最好使用通用的 AWS 凭证文件，这样在将来需要时，您可以在不更改代码的情况下切换到 IAM 角色基础凭证或 AWS STS。

import boto3 
# You should use the credential profile file 
ec2 = boto3.client("ec2")

# In boto3, if you have more than 1000 entries, you need to handle the pagination
# using the NextToken parameter, which is not shown here.

all_instances = ec2.describe_instances() 
all_sg = ec2.describe_security_groups()

instance_sg_set = set()
sg_set = set()

for reservation in all_instances["Reservations"] :
  for instance in reservation["Instances"]: 
    for sg in instance["SecurityGroups"]:
      instance_sg_set.add(sg["GroupName"]) 


for security_group in all_sg["SecurityGroups"] :
  sg_set.add(security_group ["GroupName"])

idle_sg = sg_set - instance_sg_set

注意：代码未经测试。请按要求调试。

Answer 2

利用 Boto3 的强大功能和 Python 的列表理解和集合，只需 7 行代码即可获得您想要的内容：

import boto3

ec2 = boto3.resource('ec2') #You have to change this line based on how you pass AWS credentials and AWS config

sgs = list(ec2.security_groups.all())
insts = list(ec2.instances.all())

all_sgs = set([sg.group_name for sg in sgs])
all_inst_sgs = set([sg['GroupName'] for inst in insts for sg in inst.security_groups])
unused_sgs = all_sgs - all_inst_sgs

调试信息

print 'Total SGs:', len(all_sgs)
print 'SGS attached to instances:', len(all_inst_sgs)
print 'Orphaned SGs:', len(unused_sgs)
print 'Unattached SG names:', unused_sgs

输出

Total SGs: 289
SGS attached to instances: 129
Orphaned SGs: 160
Unattached SG names: set(['mysg', '...

Answer 3

注意：如果您有处于空状态（计数=0）的 ASG（自动缩放组），当 ASG 开始添加安全组时，它将采用孤立安全组。请记住，您还需要检查 ASG 安全组

Answer 4

我使用了另一种方法。如果我们跳过凭证讨论并回到主要问题“boto3 搜索未使用的安全组”，这里有一个选项：你去枚举资源，在我的例子中是网络接口，因为如果你考虑一下，安全组必须与资源相关联才能使用。我的例子：

client = boto3.client('ec2', region_name=region, aws_access_key_id=newsession_id, aws_secret_access_key=newsession_key, aws_session_token=newsession_token)
response = client.describe_network_interfaces()
for i in response["NetworkInterfaces"]:
    #Check if the security group is attached
    if 'Attachment' in i and i['Attachment']['Status'] == 'attached':
        #Create a list with the attached SGs
        groups = [g['GroupId'] for g in i['Groups']]

我使用了网络接口资源，因为我需要为帐户获取 public 个 IP。

boto3 搜索未使用的安全组

boto3 searching unused security groups

python

amazon-ec2

amazon-web-services

aws-sdk

boto3