如何在VPC从previous EC2实例的AMI启动一个EC2实例的完全相同的副本 [英] How to Launch a exact same replica of a EC2 instance in VPC from the AMI of a previous EC2 instance

问题描述

我有一个EC2实例一，绝不能重新启动，但问题是，这将是停机维护。我基本上是用我的code创建这个实例的AMI如下：

 进口boto.ec2
进口时间
进口SYS
康恩= boto.ec2.connect_to_region（AP-东南-1）

image_id = conn.create_image（sys.argv中[1]，尼特，说明=测试，no_reboot = TRUE，block_device_mapping =无，dry_run = FALSE）
图象= conn.get_all_images（image_ids = [image_id]）[0]

！而image.state ='可用'：
    time.sleep（10）
    image.update（）
    打印图像被创建，请稍等！状态：％s的％（image.state）

如果image.state =='可用'：
   打印AMI成功创建与AMI ID =％s的％image_id
其他：
   打印出事了！
 

以上脚本工作正常，并创建我提供作为系统参数的实例的AMI。我需要启动实例A的完全相同的翻版，即需要启动需要有相同的VPC，上电集团，键名等实例.. 我想，我需要存储在一个变量实例A的详细信息，然后利用它们发动的AMI或一个新的实例类似的东西。

PS：该follwing code有助于获取实例A的细节：

 预订= conn.get_all_instances（sys.argv中[1]）
实例= [我对R的预订我的r.instances]
因为我的情况：
    打印（我.__ dict__中）
 

解决方案

下面code基本上会采取系统，您将提供实例ID的AMI，然后将其取出现有系统的细节，以及劳克新的副本系统

 从boto.regioninfo进口*
从boto.ec2.connection进口EC2Connection

＃进入实例ID在这里您要复制
实例ID ='I-XXXXXXXX

＃AWS连接信息
aws_access_key_id ='########## AWS访问密钥############
aws_secret_access_key ='########### AWS秘密钥匙############
=的region_name'AP-东南-1'
region_ec2_endpoint ='ec2.ap-southeast-1.amazonaws.com

＃连接EC2
aws_region = RegionInfo（名称=的region_name，终点= region_endpoint）
康恩= EC2Connection（aws_access_key_id，aws_secret_access_key，区域= aws_region）

＃创建AMI
打印第1步：创建AMI
ami_id = conn.create_image（INSTANCE_ID，testami，no_reboot =真）
ami_status =待定
打印AMI正在推出的+ ami_id

＃check_ami_status
图像= conn.get_image（ami_id）
而image.state ==待定：
    time.sleep（10）
    图像= conn.get_image（ami_id）
    打印AMI处于待定状态，下次检查之前等待10秒

图像= conn.get_image（ami_id）
打印图像现在是+ image.state

保留= conn.get_all_instances（instance_ids = [实例ID]）
实例= [我对R的预订我的r.instances]
因为我的情况：
    KEY_NAME = i.key_name
    security_group = []
    对于每个在i.groups：
        security_group.append（each.id）
    INSTANCE_TYPE = i.instance_type
    子网名称= i.subnet_id
    vpc_id = i.vpc_id
    储备= conn.run_instances（image_id = ami_id，subnet_id =子网名称，KEY_NAME = KEY_NAME，INSTANCE_TYPE = INSTANCE_TYPE，security_group_ids = security_group）
    打印新的副本系统ID为+ reserve.instances [0] .ID
 

I have a EC2 instance A which must NOT be rebooted, but the problem is that it's going to be down for maintenance. I basically create a AMI of this instance using my code as follows:

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!!" 

The above script works fine and creates an AMI of the instance that I provide as a system argument. I need to launch a EXACT SAME REPLICA of the instance "A" , i.e the instance that need to be launched needs to have the same VPC, sec group, key name etc.. i am thinking that i need to store the instance A's details in a variable and then use them to launch a new instance from the AMI or something like that..

P.S: The follwing code helps to get the details of the instance A:

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__)

解决方案

Below code will basically take ami of the system for which you will provide instance id, then it fetches details of the existing system , and lauch new replica system

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

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