DEV Community: Sivaranjanibharath

To modify your AWS Lambda entry point using AWS Console

Sivaranjanibharath — Thu, 11 Jan 2024 00:16:56 +0000

Lambda handler is the entry point to your code.When your function is invoked, Lambda runs the handler method. To modify the AWS Lambda entry point using console,follow the below steps:

Go to the Functions page of the Lambda console and select your function(ex:bd_register)

Select the Code tab.

Go to the Runtime settings where you can see default lambda handler function(i.e lambda_function). To change the handler function,select Edit.

you can see Handler with default handler name.

Enter the new name(bd_register) for your function handler.

Click save

Create a static S3 website

Sivaranjanibharath — Fri, 05 Jan 2024 19:11:33 +0000

Step 1: Create a bucket

Sign in to AWS console and open S3 service using the link (https://console.aws.amazon.com/s3/).
Select Create bucket. Enter the bucket name(Ex. Hello) and choose the region where you want to create bucket.Leave the other settings as default.
Then, choose Create option to create the bucket.

Step 2: Enable static website hosting

Now, bucket is created. Under the bucket list select the bucket you have created.Then, To enable static web hosting go to Properties tab of the selected bucket.
Look for Static website hosting, choose Edit.

Then, under Static website hosting, choose Enable.

In Index document, enter the index file name of the index document, typically index.html(you have to create one for your website)
In Error document, enter the error file name of the error document, typically error.html(you have to create this one for returning when an error occurs)
Click Save changes

Step 3: Edit Block Public Access settings

Click into your bucket and then select the ** Permissions** tab at the top
Under Public access settings click edit.
Now disable Block all public access and click save changes.

-It will ask for confirmation to unblock public access as shown below. Type confirm and click confirm .

Step 4: Add a bucket policy that makes your bucket content publicly available

Under Permissions tab you will find Bucket policy and click edit to add bucket policy.
Add the following policy and click Save.

{
"Version": "2012-10-17",
"Statement": [
{
"Sid": "PublicReadGetObject",
"Effect": "Allow",
"Principal": "",
"Action": "s3:GetObject",
"Resource": "arn:aws:s3:::Bucket-name/"
}
]
}

Step 5: Configure an index document

Create an index.html file.Save it locally and the filename should match the index document name that you entered in step 2.Then upload the file in the bucket you created as shown below.

Step 6: Configure an error document

Create an error.html file.Save it locally and the filename should match the error document name that you entered in step 2.Then upload the error.html file in the bucket you created as shown in above screen shot.

Step 7: Test your website endpoint

To check your website Go to Buckets and select Properties.At the bottom of the page,under Static website hosting, choose your endpoint below to see your website as shown in above screen shot.

Step 8: Clean up

Delete the resources if you created this website for learning purpose.

Installing Jenkins in EC2

Sivaranjanibharath — Mon, 11 Dec 2023 19:28:09 +0000

Background

This post shows the steps we need to follow to install jenkins in an EC2 that has ubuntu OS

Steps

ssh into your ec2
sudo apt-get update

Java by default is not available in a EC2. However jenkins needs a java. Verify if java is available in your ec2 by invoking,

java -version

If you get the below message you need to install java before you proceed.

Command 'java' not found

*In case of missing java runtime environment (JRE) install by following the instructions at https://www.jenkins.io/doc/book/installing/linux/#installation-of-java .You can test your installation by executing the below command,

java -version

You'd get a message something like,

ubuntu@ip-172-31-40-141:~$ java -version
openjdk version "17.0.9" 2023-10-17
OpenJDK Runtime Environment (build 17.0.9+9-Ubuntu-122.04)
OpenJDK 64-Bit Server VM (build 17.0.9+9-Ubuntu-122.04, mixed mode, sharing)

This doc installs jenkins LTS version(Long Term Support version). Follow install script in https://www.jenkins.io/doc/book/installing/linux/#long-term-support-release
Jenkins should start the background service. Alternatively you can also start the service by executing service start command

sudo systemctl start jenkins

Jenkins Admin UI Access

UI verification

Jenkins comes with a web application archive (aka .war) deployed. This webapp helps you access, customize and execute a jenkins pipeline using an graphical user interface (GUI). However you cannot access the ui from your ssh terminal. But it is worth checking the webapp is up and running by using curl against port 8080 which is the default port that runs jenkins.

curl http://localhost:8080

In the terminal you should see a basic html code that the server's home page sends back. With that you can confirm that jenkins is running and the admin web app is properly installed.

Access through web browser

Given that the application is running on an EC2, you have to manually open port 8080 to be accessed over the internet in the EC2 security group.

Security group changes

Login to your AWS console and navigate to EC2 home page.

AWS Console -> in Navbar search ec2 -> choose EC2
Choose your instance where you installed jenkins and in the bottom half of your screen choose the

Security Tab

that lists the security groups associated with this instance.
On the Inbound rules tab, Choose

Edit inbound rules -> Add rule
For Type choose Custom TCP, For port type in

8080

, For Source, choose My IP
Save and exit

This allows 8080 port to be accessed from your computer alone using HTTP protocol

Last step

Open browser and using your ec2's public IP or DNS to open the jenkins admin page

http://ec2_DNS:8080/

You'd be greeted with a nice UI interface that asks for the password
The default password is protected and securely stored in a file in the jenks server.
You can access the password by ssh into the ec2 again and view the file with command

sudo cat /var/lib/jenkins/secrets/initialAdminPassword

Copy that password and provided it in the browser's password box

We are all set!!