脚本要实现的功能:输入instance id
1:将所有的volume take snapshot
2: 获取public ip 并登陆机器执行 ps 命令记录patch前进程状态已经端口状态
3:获取机器所在的elb
4: 从elb中移除当前机器
5:检查snapshots是否完成
6:snapshots完成后patching
7: patching完成后将instance加回到elb
#!/usr/bin/python # vim: expandtab:tabstop=4:shiftwidth=4 ''' script to get ecr info ''' # Reason: disable invalid-name because pylint does not like our naming convention # pylint: disable=invalid-name import time import boto3 import sys import argparse def get_volume(ec2, instanceId): result = [] instance = ec2.Instance(instanceId) volumes = instance.volumes.all() for volume in volumes: print("Volume attached to this instance is :" + volume.id) result.append(volume.id) return result def take_snapByInstance(client, instanceId): response = client.create_snapshots( Description='string', InstanceSpecification={ 'InstanceId': instanceId, 'ExcludeBootVolume': False }, TagSpecifications=[ { 'ResourceType': 'snapshot', 'Tags': [ { 'Key': 'orginName', 'Value': 'patch backup'+ instanceId }, ] }, ], DryRun=False, CopyTagsFromSource='volume' ) print("Creating new snapshots for instances:" + response['Snapshots'][0]['SnapshotId']) return response['Snapshots'][0]['SnapshotId'] def get_publicIp(ec2, instanceId): instance = ec2.Instance(instanceId) publicIp = instance.public_ip_address return publicIp def take_screenshotOfProcess(public_ip): print("Please run this command on your local machine") print('ssh -t ' + public_ip + ' "sudo netstat -tnpl > disk.listen"') print('ssh -t ' + public_ip + ' "sudo ps auxf > disk.ps"') def get_elbInfo(client_elb, ec2, instanceId): bals = client_elb.describe_load_balancers() for elb in bals['LoadBalancerDescriptions']: #print('ELB DNS Name : ' + elb['DNSName']) #check if the elb is the elb of instance if instanceId in elb['Instances']: print("found elb " + elb['DNSName']) else: pass def remove_fromElb(client_elb, elb, instanceId): response = client_elb.deregister_instances_from_load_balancer( LoadBalancerName='elb', Instances=[ { 'InstanceId': instanceId }, ] ) def add_backElb(client_elb, elb, instanceId): response = client.register_instances_with_load_balancer( LoadBalancerName= elb, Instances=[ { 'InstanceId': instanceId }, ] ) def check_snapStatus(ec2, snaps): snapshot = ec2.Snapshot(snaps) snapshot.load() print(snapshot.state) return snapshot.state def main(ec2, client, instanceId, client_elb): print("going to paching instanceid: " + instanceId) #get volumes volumes = get_volume(ec2, instanceId) #get public ip public_ip = get_publicIp(ec2, instanceId) #take snapshot snaps = take_snapByInstance(client, instanceId) #take screenshot of procss and port take_screenshotOfProcess(public_ip) #get elb info elb = False #elb = get_elbInfo(client_elb, ec2, instanceId) #remove from elb if elb: ans_remove = input("Are you sure to remove the instance from the elb now") if ans_remove == 'Yes': #remove from instance remove_fromElb(client_elb, elb, instanceId) #check snapshot status snapshotStatus = '' check_snapStatus(ec2, snaps) print("checking staus of snapshots") while True: snapshotStatus = check_snapStatus(ec2, snaps) print(snapshotStatus) if snapshotStatus == 'completed': break else: time.sleep(10) #paching paching_cmd = 'Your paching command' print(paching_cmd) #add to elb if elb: ans_add = input("please confirm the patching is over , input yes to continue") if ans_add == 'Yes': add_backElb(client_elb, elb, instanceId) if __name__ == "__main__": ec2 = boto3.resource('ec2', region_name='us-east-1') client = boto3.client('ec2', region_name='us-east-1') client_elb = boto3.client('elb', region_name='us-east-1') main(ec2, client, 'i-abcasdfa111122', client_elb)
注意,本脚本并未包含链接机器并执行命令的部分,仅仅是打印出命令,需要手动执行 take_screenshotOfProcess
已经patch的命令,此部分也参考之前的文章,完全自动化,不需要手动执行
另外Patch命令脚本中并未给出
总结
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