---
title: How to send AWS CloudWatch Alarms to Slack using lambda function.
tags: AWS, EC2, cloudwatch, alarm, slack.
description:
---

# How to send AWS CloudWatch Alarms to Slack using lambda function

## What we need?

- Login credential of your AWS account :laughing:.
- Slack Admin access.

## Steps need to perform on AWS console.

### Create Role

- Go on Roles from navigation pane.
- Click on create role.
- Chosse a service will use the role click on **Lambda**.
- Click next.
- Attach a policy name **AWSLambdaBasicExecutionRole** (you can search using policy name).
- Click next next till it's not ask for role name.
- Give role name and description.
- click on create role.
- :tada: It's Done.

## Configure slack app

Add Incoming webhook

That variable you should fill with the Slack Incoming Webhook, create a new one for CloudWatch on that page for your organization.

Get A web hook URL from APP.

## Deploy Lambda function

To deploy the AWS Lambda function, you need to clone the repository and have Node.js installed on your local machine.

`git clone https://github.com/assertible/lambda-cloudwatch-slack.git`
`cd lambda-cloudwatch-slack`
`cp .env.example .env`

Open your .env file and fill in the environment variables.

## Configure `.env` file

AWS_FUNCTION_NAME
The name of your function which will be declared in your AWS Lambda function page. Let’s call it “cloudwatch-to-slack.”

AWS_ROLE=arn:aws:iam::123456789123:role/lambda_exec_role
Copy the arn id of role you created eariler.

AWS_ACCESS_KEY_ID
AWS_SECRET_ACCESS_KEY

- Go on AWS console select IAM page.
- Click on users from navigation pane.
- Click Add user.
- Attach administrative access to user `AdministratorAccess`.
- And click on next.
- Copy AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY.
- Go on your local computer.
- use command `vim ~/.aws/credentials`
- Add your key here like this.

[claudia]
aws_access_key_id = xxxxxxxxx
aws_secret_access_key = xxxxxxxxxxxxxxxxx

- And same add this to .env file.
- Run following commands.

npm install
npm run deploy

- Check your lambda function page you will able to see one new lambda function created.
- :tada: It's done.

###### If you get any problem for trobleshooting please user link in reference

## Create an SNS topic and subscription

### Create a topic
- Go on [SNS](https://console.aws.amazon.com/sns/v2/home?region=us-east-1) page.
- Click on Create topic.
- Give a name and configure your topic.
- Click on create topic.

### Create a subscription
- Click on create a subscription.
- Select a topic.
- Select **lambda** in protocol.
- And select lambda function created by your deployed code.
- And click on create a subscription.

#### Attach topic with your Alarm and it's all set.

## Thanks a lot
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##### Referance link
[How to send AWS CloudWatch Alarms to Slack](https://medium.com/pixelpoint/how-to-send-aws-cloudwatch-alarms-to-slack-502bcf106047)