automate-launch-configuration-update-with-latest-image

automate-launch-configuration-update-with-latest-image/README.md

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+# DO NOT USE
+
+## SCRIPT UNDER CONSTRUCTION

automate-launch-configuration-update-with-latest-image/automate-launch-configuration-update-with-latest-image.sh

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+#!/bin/bash
+
+# This script will do the following (in order):
+#	- Get a list of instances running inside the autoscaling group
+#	- Create an AMI of the particular instance and store AMI ID
+#	- fetch the launch configuration name to an autoscaling group (passed as parameter to script)
+#	- create a new launch configuration with the updated image
+#	- Assign the Launch Configuration to the existing Auto Scaling Group (ASG)
+#	- Removal of old Launch Configurations (commented for now)
+#
+# NOTES:
+#	When you change the launch configuration for your Auto Scaling group, 
+#		any new instances are launched using the new configuration parameters, 
+#		but existing instances are not affected.
+
+if [ "$#" -ne 3 ]; then
+	usage
+else
+	# export AWS PROFILES
+	export AWS_PROFILE="$1"
+	export AWS_REGION="$2"
+
+	# Enter ASG Name
+	export ASG_NAME="$3"
+
+	# Initializing Logic:
+	# Setting aws binary location alias with profile parameter
+	alias aws=''`which aws`' --region '"$AWS_REGION"' --output text --profile '"$AWS_PROFILE"''
+	shopt -s expand_aliases
+
+	DATETODAY=$(date +%d%m%Y)
+	DATEYESTERDAY=$(date +%d%m%Y --date='yesterday')
+
+	# Get launch configuration name from ASG_NAME
+	LC_NAME="$(aws autoscaling describe-auto-scaling-groups --auto-scaling-group-names $ASG_NAME --output text --query 'AutoScalingGroups[].LaunchConfigurationName')"
+	NEW_LC_NAME="$(echo $LC_NAME | awk -F- 'sub(FS $NF,x)')"-"$DATETODAY"
+
+	# Get 1 random instance ID from the list of instances running under ASG_NAME
+	RANDOM_INST_ID="$(aws autoscaling describe-auto-scaling-groups --auto-scaling-group-names $ASG_NAME --output text --query 'AutoScalingGroups[].Instances[?HealthStatus==`Healthy`].InstanceId' | tr -s '\t' '\n' | shuf -n 1)"
+
+	# Create AMI from the Instance without reboot
+	AMI_ID="$(aws ec2 create-image --instance-id $RANDOM_INST_ID --name "$ASG_NAME"-"$DATETODAY" --output text --no-reboot)"
+
+	# Extract existing launch configuration
+	aws autoscaling describe-launch-configurations --launch-configuration-names $LC_NAME --output json --query 'LaunchConfigurations[0]' > /tmp/$LC_NAME.json
+
+	# Remove unnecessary and empty entries from the launch configuration JSON and fill up with latest AMI ID
+	cat /tmp/$LC_NAME.json | \
+		jq 'walk(if type == "object" then with_entries(select(.value != null and .value != "" and .value != [] and .value != {} and .value != [""] )) else . end )' | \
+		jq 'del(.CreatedTime, .LaunchConfigurationARN)' | \
+		jq ".ImageId = \"$AMI_ID\" | .LaunchConfigurationName = \"$NEW_LC_NAME\"" > /tmp/$NEW_LC_NAME.json
+
+	# Create new launch configuration with new name
+	if [ -z "$(jq .UserData /tmp/$LC_NAME.json --raw-output)" ]; then
+		aws autoscaling create-launch-configuration \
+			--cli-input-json file:///tmp/$NEW_LC_NAME.json
+	else
+		aws autoscaling create-launch-configuration \
+			--cli-input-json file:///tmp/$NEW_LC_NAME.json \
+			--user-data file://<(jq .UserData /tmp/$NEW_LC_NAME.json --raw-output | base64 --decode)
+	fi
+
+	# Update autoscaling group with new launch configuration
+	aws autoscaling update-auto-scaling-group --auto-scaling-group-name "$ASG_NAME" --launch-configuration-name "$NEW_LC_NAME"
+
+	# Delete old launch configuration
+	#aws autoscaling delete-launch-configuration --launch-configuration-name "$LC_NAME_OLD"
+
+	# Resetting aws binary alias
+	unalias aws
+fi

automate-launch-configuration-update-with-latest-image/launchConfig.json

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+{
+    "LaunchConfigurationName": "", 
+    "ImageId": "", 
+    "KeyName": "", 
+    "SecurityGroups": [
+        ""
+    ], 
+    "ClassicLinkVPCId": "", 
+    "ClassicLinkVPCSecurityGroups": [
+        ""
+    ], 
+    "UserData": "", 
+    "InstanceId": "", 
+    "InstanceType": "", 
+    "KernelId": "", 
+    "RamdiskId": "", 
+    "BlockDeviceMappings": [
+        {
+            "VirtualName": "", 
+            "DeviceName": "", 
+            "Ebs": {
+                "SnapshotId": "", 
+                "VolumeSize": 0, 
+                "VolumeType": "", 
+                "DeleteOnTermination": true, 
+                "Iops": 0, 
+                "Encrypted": true
+            }, 
+            "NoDevice": true
+        }
+    ], 
+    "InstanceMonitoring": {
+        "Enabled": true
+    }, 
+    "SpotPrice": "", 
+    "IamInstanceProfile": "", 
+    "EbsOptimized": true, 
+    "AssociatePublicIpAddress": true, 
+    "PlacementTenancy": ""
+}