Perfgenx - All About Performance: 2019

Wednesday 16 October 2019

Execute commands remotely on AWS EC2 linux instance in Python

import paramiko

##Initiate SSH Connection
ssh = paramiko.SSHClient()
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
try:
ssh.connect(hostname=<hostIp>,port=<port>,username=<username>,key_filename=<keypath>)
print("Connection Successfully Established!")
except paramiko.AuthenticationException:
print("Authentication Failed!")

#Execute Commands
ssh.exec_command("ls -lst")

Remote connection to AWS EC2 Linux Instance in Python

import paramiko

##Initiate SSH Connection
ssh = paramiko.SSHClient()
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
try:
ssh.connect(hostname=<host_ip>,port=<port>,username<username>,key_filename=<keypath>)
print("Connection Successfully Established!")
except paramiko.AuthenticationException:
print("Authentication Failed!")

Logging module in python

import logging

##Logging Basic Configurations
logging.basicConfig(filename="Scriptlog.log" , format='%(asctime)s %(message)s', filemode='w')
logger = logging.getLogger('logger')
logger.setLevel(logging.INFO) #Log Level can be changed to DEBUG, ERROR, WARNING etc.

##Put below logger where you want logging
logger.info("Python script has been completed")

Python Code to Stop AWS EC2 Instances Using Filters

import sys

import boto3

from botocore.exceptions import ClientError

region = 'xx-east-x'

InstanceList = []

try:

ec2 = boto3.client('ec2', region_name=region)

except Exception as e:

print(e)

sys.exit(1)

response = ec2.describe_instances(

Filters=[{

'Name': '<tagname>',

'Values': ['<value>']

{

'Name' : 'instance-state-name',

'Values' : ['stopped']

}]

)

#print (response)

for reservation in response['Reservations']:

for instance in reservation['Instances']:

InstanceList.append(instance['InstanceId'])

#print InstanceList

for instanceid in InstanceList:

startec2 = ec2.start_instances(InstanceIds=[instanceid])

Python Code to Start AWS EC2 Instances Using Filters