How can I use the AWS launch template to achieve the goal of deploying a fleet of EC2 instances for a web-based application?
I am currently engaged in a particular task that is related to deploying a fleet of EC2 instances for a particular web-based application. My team wants to ensure consistent Configuration and easy scalability. How can I use the AWS launch template to achieve this goal effectively?
In the context of AWS, you can achieve consistent Configuration and easy scalability by using the AWS launch template to deploy EC2 Instance for a particular web-based application by using the several steps which are given below:-
Creating a launch template
You can use the AWS management console to create a launch template. You can specify parameters such as AMI ID, instance type, key pair, security group, etc.
Aws ec2 create-launch-template –launch-template-name my-launch-template
--version-description “Initial version”
--launch-template-data file://launch_template.json
In the launch _ template.json file you can define the Configuration:-
{
“ImageId”: “ami-xxxxxxxx”,
“InstanceType”: “t2.micro”,
“KeyName”: “my-key-pair”,
“SecurityGroupIds”: [“sg-xxxxxxxx”],
“IamInstanceProfile”: {
“Arn”: “arn:aws:iam::123456789012:instance-profile/my-iam-role”
},
“UserData”: “base64-encoded-user-data-script”
}Include auto scaling Configuration
If you have a concern about scalability then you can try to integrate auto-scaling Configuration into your launch template. You can specify the parameters such as minimum and maximum instance count, desired capacity, etc.
{
“ImageId”: “ami-xxxxxxxx”,
“InstanceType”: “t2.micro”,
“KeyName”: “my-key-pair”,
“SecurityGroupIds”: [“sg-xxxxxxxx”],
“IamInstanceProfile”: {
“Arn”: “arn:aws:iam::123456789012:instance-profile/my-iam-role”
}, “UserData”: “base64-encoded-user-data-script”,
“InstanceMarketOptions”: {
“MarketType”: “spot”
},
“TagSpecifications”: [
{
“ResourceType”: “instance”,
“Tags”: [
{
“Key”: “Name”,
“Value”: “MyInstance”
}
]
}
]
}Utilize parameterized values
You can make use of parameterized values with your launch template to make the Configuration dynamic and reusable across different environments.
{
“ImageId”: “${imageId}”,
“InstanceType”: “${instanceType}”,
“KeyName”: “${keyName}”,
“SecurityGroupIds”: [“${securityGroupId}”],
“IamInstanceProfile”: {
“Arn”: “${iamInstanceProfileArn}”
},
“UserData”: “base64-encoded-user-data-script”
}
Optimization of performance
You can include Configuration in the launch template which can optimize the performance.
{
“InstanceType”: “c5.large”,
“BlockDeviceMappings”: [
{
“DeviceName”: “/dev/sda1”,
“Ebs”: {
“VolumeSize”: 50,
“VolumeType”: “gp2”,
“DeleteOnTermination”: true
}
}
],
“NetworkInterfaces”: [
{
“AssociatePublicIpAddress”: true,
“DeviceIndex”: 0,
“Groups”: [“sg-xxxxxxxx”],
“SubnetId”: “subnet-xxxxxxxx”
} ]}