如何从先前 EC2 实例的 AMI 启动 VPC 中 EC2 实例的完全相同的副本

Question

我有一个不能重新启动的 EC2 实例 A，但问题是它将因维护而停机。我基本上使用我的代码创建了这个实例的 AMI，如下所示：

import boto.ec2
import time
import sys 
conn = boto.ec2.connect_to_region("ap-southeast-1")

image_id = conn.create_image(sys.argv[1], "nits", description="Testing", no_reboot=True, block_device_mapping=None, dry_run=False)
image = conn.get_all_images(image_ids=[image_id])[0]

while image.state != 'available':
    time.sleep(10)
    image.update()
    print "The image is being Created, Please wait!! state:%s" % (image.state) 

if image.state == 'available':
   print "AMI CREATED SUCCESSFULLY with AMI id = %s" % image_id   
else:
   print "Something Went Wrong!!" 

上述脚本运行良好，并创建了我作为系统参数提供的实例的 AMI。我需要启动实例“A”的完全相同的副本，即需要启动的实例需要具有相同的 VPC、sec 组、密钥名称等。 我在想我需要将实例 A 的详细信息存储在一个变量中，然后使用它们从 AMI 或类似的东西启动一个新实例..

P.S：以下代码有助于获取实例 A 的详细信息：

reservations=conn.get_all_instances(sys.argv[1])
instances = [i for r in reservations for i in r.instances]
for i in instances:
    print(i.__dict__)

Answer 1

下面的代码基本上会获取您将为其提供实例 id 的系统的 ami，然后它会获取现有系统的详细信息，并启动新的副本系统

from boto.regioninfo import *
from boto.ec2.connection import EC2Connection

# Enter Instance ID here for which you want replication
instance_id = 'i-XXXXXXXX'

# AWS connect info
aws_access_key_id='########## AWS Access Key ############'
aws_secret_access_key='########### AWS Secret Key ############'
region_name='ap-southeast-1'
region_ec2_endpoint='ec2.ap-southeast-1.amazonaws.com'

# Connect EC2
aws_region = RegionInfo(name=region_name, endpoint=region_endpoint)
conn = EC2Connection(aws_access_key_id,aws_secret_access_key,region=aws_region)

# create ami
print "Step 1 : Creating ami"
ami_id = conn.create_image(instance_id,"testami",no_reboot=True)
ami_status = "Pending"
print "ami is being launched " + ami_id

# check_ami_status
image = conn.get_image(ami_id)
while image.state == "pending":
    time.sleep(10)
    image = conn.get_image(ami_id)
    print "ami is in pending state, waiting for 10 sec before next check"

image = conn.get_image(ami_id) 
print "Image is now " + image.state

reservations = conn.get_all_instances(instance_ids=[instance_id])
instances = [i for r in reservations for i in r.instances]
for i in instances:
    key_name = i.key_name
    security_group = []
    for each in i.groups:
        security_group.append(each.id)
    instance_type = i.instance_type
    subnet_name = i.subnet_id
    vpc_id = i.vpc_id
    reserve = conn.run_instances(image_id=ami_id,subnet_id=subnet_name ,key_name=key_name,instance_type=instance_type,security_group_ids =security_group)
    print "new replica system id is " + reserve.instances[0].id