📌Shell Scripting

1. It is a set of commands written in an executable file to automate any task. The commands are converted then to machine-readable form to execute.

• Syntax:-

  #!/bin/bash

  <commands>

1. The file to be created must be with extension ".sh" and provided with necessary execute permissions to the user running the script.

2. Navigate to the server and create a directory of your suitable name.

3. Create a shell script file. I have created here a AWS_resource.sh file.

4. In this project, I have chosen few resources to display and they are:-

• AWS EC2

• S3 Buckets

• AWS Lambda

• IAM users

1. The shell script file determine the AWS resource usage is as below:-

#!/bin/bash

path=/home/ubuntu/shell_script/script.sh

############################AWS Active Resources ####################################################################### echo "-----------------------------------------------------------------------------------------------------------------------------------------------------" 
#List S3 buckets
 echo "list aws s3 buckets:" 
aws s3 ls 
echo "-----------------------------------------------------------------------------------------------------------------------------------------------------" 
#list EC2 instances 
echo "list ec2 instances:" 
aws ec2 describe-instances 
echo "-----------------------------------------------------------------------------------------------------------------------------------------------------" 
#list lambda 
echo "list ec2 lambda:" 
aws lambda list-functions 
echo "-----------------------------------------------------------------------------------------------------------------------------------------------------" 
#list IAM users 
echo "list IAM users:" 
aws iam list-users

1. Now, let's add the server health monitoring where we have determined disk space and memory of the server.

############################## Health Check of Server #####################################################################

echo "-----------------------------------------------------------------------------------------------------------------------------------------------------"
echo "Disk usage of the server is:"
df -h
echo "-----------------------------------------------------------------------------------------------------------------------------------------------------"
M=`sudo cat /proc/meminfo | grep -i memtotal | awk '{print $2}'`
echo "Total memory of the server is:$M"

echo "Memory utilized in the server is:"
sudo free -h

############################################################################################################################################################

1. Save the file and now give permission to the file with below command.

chmod 700 AWS_resource.sh

1. In this project we will send the mail to the user's account for which E-Mail services needs to be setup which we will see in next section.

2. We need to put the output to a text file and then send the file content to the Email address. The shell script for this cause is:-

#!bin/bash

bash /home/ubuntu/shell_script/Aws_resource.sh 1>/home/ubuntu/shell_script/script.txt

cat script.txt | mail -s "AWS Resource cost and server monitoring" [e-mail]