腳本要實現的功能：輸入instance id

1：將所有的volume take snapshot

2: 獲取public ip 并登陸機器執行 ps 命令記錄patch前進程狀態已經端口狀態

3：獲取機器所在的elb

4: 從elb中移除當前機器

5：檢查snapshots是否完成

6：snapshots完成后patching

7: patching完成后將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-nameimport timeimport boto3import sysimport argparsedef 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 resultdef 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 publicIpdef 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: passdef 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.statedef 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? Yes/No') 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，本腳本并未包含鏈接機器并執行命令的部分，僅僅是打印出命令，需要手動執行 take_screenshotOfProcess 已經patch的命令，此部分也參考之前的文章，完全自動化，不需要手動執行

另外Patch命令腳本中并未給出

總結

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