Simple script for looping ec2 through instances and running yum updates.

yum_updates.sh

@@ -0,0 +1,77 @@
+#!/bin/bash
+
+# Gather a list of AWS Instances containing their name, id, private IP address, and Key Pair name
+instances=$(aws ec2 describe-instances --query 'Reservations[].Instances[].[Tags[?Key==`Name`].Value | [0], InstanceId, PrivateIpAddress, KeyName]' --output text)
+
+# Provides that list to the user in concise, readable format
+echo "Here are the instances on this AWS account:"
+echo "$instances"
+echo ""
+
+# Prompt the user whether they would like to run updates on that list
+read -p "Would you like to run updates on these instances? (y/n): " answer
+
+if [[ $answer == "y" ]]; then
+  # Loop over the instances and prompt the user whether to perform the updates
+  for instance in $instances; do
+    name=$(echo $instance | awk '{print $1}')
+    id=$(echo $instance | awk '{print $2}')
+    private_ip=$(echo $instance | awk '{print $3}')
+    key_name=$(echo $instance | awk '{print $4}')
+    
+    read -p "Do you want to update $name ($private_ip)? (y/n): " update_answer
+    
+    if [[ $update_answer == "y" ]]; then
+      # Use the private IP of the instance and Key Pair name to log in via ssh and perform the security update
+      ssh -i $key_name.pem ec2-user@$private_ip "sudo yum check-updates --security"
+      
+      # Prompt the user to confirm before continuing
+      read -p "Review the above list. Are you sure you want to update $name ($private_ip)? (y/n): " review_answer
+      
+      if [[ $review_answer == "y" ]]; then
+        ssh -i $key_name.pem ec2-user@$private_ip "sudo yum update --security"
+      fi
+    fi
+  done
+fi
+
+echo "Done."
+
+# Same script but uses the public DNS record of the instance to access.
+#
+# Gather a list of AWS Instances containing their name, id, public IPv4 DNS, and Key Pair name
+# instances=$(aws ec2 describe-instances --query 'Reservations[].Instances[].[Tags[?Key==`Name`].Value | [0], InstanceId, PublicDnsName, KeyName]' --output text)
+
+# # Provides that list to the user in concise, readable format
+# echo "Here are the instances on this AWS account:"
+# echo "$instances"
+# echo ""
+
+# # Prompt the user whether they would like to run updates on that list
+# read -p "Would you like to run updates on these instances? (y/n): " answer
+
+# if [[ $answer == "y" ]]; then
+#   # Loop over the instances and prompt the user whether to perform the updates
+#   for instance in $instances; do
+#     name=$(echo $instance | awk '{print $1}')
+#     id=$(echo $instance | awk '{print $2}')
+#     public_dns=$(echo $instance | awk '{print $3}')
+#     key_name=$(echo $instance | awk '{print $4}')
+    
+#     read -p "Do you want to update $name ($public_dns)? (y/n): " update_answer
+    
+#     if [[ $update_answer == "y" ]]; then
+#       # Use the public IPv4 DNS of the instance and Key Pair name to log in via ssh and perform the security update
+#       ssh -i $key_name.pem ec2-user@$public_dns "sudo yum check-updates --security"
+      
+#       # Prompt the user to confirm before continuing
+#       read -p "Review the above list. Are you sure you want to update $name ($public_dns)? (y/n): " review_answer
+      
+#       if [[ $review_answer == "y" ]]; then
+#         ssh -i $key_name.pem ec2-user@$public_dns "sudo yum update --security"
+#       fi
+#     fi
+#   done
+# fi
+
+# echo "Done."