Is there a scheduling service in AWS? - amazon-web-services

I need something like SQS that would call my api on schedule. Also I need to be able to create new "schedules"

AWS Cloudwatch events is what you are looking for:
Events—An event indicates a change in your AWS environment. AWS resources can generate events when their state changes. For example, Amazon EC2 generates an event when the state of an EC2 instance changes from pending to running, and Amazon EC2 Auto Scaling generates events when it launches or terminates instances. AWS CloudTrail publishes events when you make API calls. You can generate custom application-level events and publish them to CloudWatch Events. You can also set up scheduled events that are generated on a periodic basis. For a list of services that generate events, and sample events from each service, see CloudWatch Events Event Examples From Supported Services.
https://docs.aws.amazon.com/AmazonCloudWatch/latest/events/WhatIsCloudWatchEvents.html

Related

AWS EventBridge handle UpdateThingShadow event

Is it possible for AWS EventBridge to track UpdateThingShadow type of event and create a rule for those? How might an event pattern for such an update look like, and is the AWS service that we listen to AWS IOT Core, AWS CloudTrail or AWS CloudWatch?
The use case is that I do not want to expose the Device shadow directly, but have a table that reflects the state. Updating the table would trigger a custom EventBridge event that updates the table, while updating the DeviceShadow directly should trigger an AWS event that can hopefully be caught in the default AWS EventBridge. The question is what service triggers the event I might want to catch, and what EventPattern would that be.
Based on the IOT Core documentation, there is no mention of device shadow update events being triggered by the IOT Core service.
There is though, mention of monitoring UpdateThingShadow in CloudWatch. Does that mean that my EventBridge should listen to events coming in from Cloudwatch of type UpdateThingShadow?

Difference between AWS CloudWatch and AWS CloudWatch Events

Was studying about Amazon web services and fundamentals when came across these 2 concepts:
Amazon CloudWatch
Amazon CloudWatch Events
Even while going through the official documents on AWS, I couldn't find a difference between the two even when Amazon mentions that they are different. Excerpt is:
CloudWatch provides you with data and actionable insights to monitor
your applications, respond to system-wide performance changes,
optimize resource utilization, and get a unified view of operational
health. CloudWatch collects monitoring and operational data in the
form of logs, metrics, and events, providing you with a unified view
of AWS resources, applications, and services that run on AWS and
on-premises servers. You can use CloudWatch to detect anomalous behavior in your environments, set alarms, visualize logs and metrics side by side, take automated actions, troubleshoot issues, and discover insights to keep your applications
running smoothly.
Documentation of AWS CloudWatch
Amazon CloudWatch Events delivers a near real-time stream of system
events that describe changes in Amazon Web Services (AWS) resources.
Using simple rules that you can quickly set up, you can match events
and route them to one or more target functions or streams. CloudWatch
Events becomes aware of operational changes as they occur. CloudWatch
Events responds to these operational changes and takes corrective
action as necessary, by sending messages to respond to the
environment, activating functions, making changes, and capturing
state information.
Documentation of AWS CloudWatch Events
CloudWatch
CloudWatch is a monitoring service for your AWS resources. You can log your log files. By default the resources created within AWS logs in CloudWatch(CW). You can monitor the performance of resources too for example you can monitor how is the CPU utilisation of your EC2 instances. You can set Alarms for your resources
threshold and get an SNS alert on that. For example you can create an Alarm for your DynamoDB if Write capacity is exceeding. You can set an alarm for your billing too. So basically CW is used as a Monitoring solution.
CloudWatch Events
CW Events is also the part of CloudWatch. CloudWatch Events is helpful when you want to schedule something. Say you to want run your lambda every other day, you can create a Rule for that or you want to trigger your lambda by Event Pattern. There are bunch of services supported by CloudWatch Events, you can use anyone of them as your target not just Lambda. Event Buses is used to send your events to multiple accounts also. For example if you have a CICD account and every month you bake new AMI there, to notify all accounts you can use Event Buses, after getting the event from Event Buses other accounts can trigger some important tasks.

CloudWatch Monitoring and Notifications

I am using various AWS services (Lambda, Glue, S3, Redshift, EC2) for ETL processing. I am trying to create a 'log ETL flow' to have monitoring and notifications sent out (email or otherwise) when a step fails in the process.
I have checked that each service I am using has metrics being logged in CloudWatch. I am now trying to figure out a smart way of processing this data in order to send out notifications when a step fails and/or have a central monitoring of the entire flow.
Are there any best practices or examples of this setup?
It seems to be the perfect case for the CloudWatch Alarms.
You can create a CloudWatch alarm that watches a single CloudWatch metric or the result of a math expression based on CloudWatch metrics. The alarm performs one or more actions based on the value of the metric or expression relative to a threshold over a number of time periods. The action can be an Amazon EC2 action, an Amazon EC2 Auto Scaling action, or a notification sent to an Amazon SNS topic.
You can create a chain CloudWatch Alarm -> SNS
You can either use SNS to notify users via SMS or Push Notifications.
Or you can do one step more SNS -> SES to deliver emails.

AWS - is there a way to receive events asynchronously without the lambda

I have a general AWS question. I have started using AWS sdk, but looks like if I want to receive events asynchronously from AWS(ex: cloudwatch events), lambda functions is the only way. I want to write a simple application that registers a callback to AWS for events, but i couldn't find a way to do that till now, since i don't want to use lambda, i have been polling from my application. Please, let me know if polling is the only option or if there is a better way to resolve it without polling.
From the documentation:
You can configure the following AWS services as targets for CloudWatch Events:
Amazon EC2 instances
AWS Lambda functions
Streams in Amazon Kinesis Streams
Delivery streams in Amazon Kinesis Firehose
Amazon ECS tasks
SSM Run Command
SSM Automation
Step Functions state machines
Pipelines in AWS CodePipeline
Amazon Inspector assessment templates
Amazon SNS topics
Amazon SQS queues
Built-in targets
The default event bus of another AWS account
That's a lot more than just Lambda, so I'm not sure why you state in your question that Lambda is the only option. The options of Amazon EC2 instances and Amazon SNS topics both provide a method for Amazon to "push" the events to your services, instead of requiring your services to poll.
With cloudwatch events, you can set rules and trigger a number of different targets, including SQS queues which you can poll from your EC2 Instances.
Lambda is certainly a popular endpoint, but based on the docs, there are other targets you can send the events to
Already above answers might also be helpful, but one of the possible options to address your problem could be one of this as well.
You can make use of AWS SNS service to subscribe for the events on AWS resources. And the SNS can publish the events to your application end point. Which is nothing but pub/sub model.
Refer this link http://docs.aws.amazon.com/sns/latest/api/API_Subscribe.html
The end-point could be your http or https based application.

Get Email notifications when ec2 instance in terminated

I need to receive notifications whenver my instance in terminated. I know it can be done by cloudtrail and then using sns and sqs to get email for it, if you receive event of termination.
Is there a simpler way to do that ?
Any solution will is appreciated, but I prefer is doing using boto.
While it is not possible to receive a notification directly from Amazon EC2 when an instance is terminated, there are a couple of ways this could be accomplished:
Auto Scaling can send a notification when an instance managed by Auto Scaling is terminated. See: Configure Your Auto Scaling Group to Send Notifications
AWS Config can also be configured to send a Simple Notification Service (SNS) notification when resources change. This would send many notifications, so you would need to inspect and filter the notifications to find the one(s) indicating an instance termination. See the SNS reference in: Set Up AWS Config Using the Console and Example Amazon SNS Notification and Email from AWS Config.
Amazon Simple Notification Service (SNS) can also push a message to Amazon Queueing Service (SQS), which can be easily polled with the boto python SDK.
Receiving notifications via CloudTrail and CloudWatch Logs is somewhat messier, so I'd recommend the AWS Config method.
Now AWS introduced "rules" Under "Events" in AWS CloudWatch. In your case, you can select EC2 as Event Selector and SNS or SQS as Targets.
https://aws.amazon.com/blogs/aws/new-cloudwatch-events-track-and-respond-to-changes-to-your-aws-resources/
According to the AWS doc: Spot Instance Interruptions, it is possible to pool the instance-metadata in order to get an approximation of the termination time. You can build any custom monitoring solution around that.
> curl http://169.254.169.254/latest/meta-data/spot/instance-action
{"action": "stop", "time": "2017-09-18T08:22:00Z"}
If the instance is not scheduled for termination a http:400 will be returned.