EC2 and Java Spring Boot

These days, containers and ECS/EKS seem to be all the rage.  However, I wanted to make sure I could still install and run my application on an EC2 Instance.

I decided to create an EC2 Instance t2.micro) using the AMI for Amazon Linux 2.

Step 1: Installing Java 17 (Amazon Corretto)

I logged in using the private key from the Keypair I generated and installed Java 17:

login as: ec2-user

Authenticating with public key "java-demo-keypair"

Last login: Mon Dec 19 02:54:32 2022 from **********

       __|  __|_  )

       _|  (     /   Amazon Linux 2 AMI

      ___|\___|___|

https://aws.amazon.com/amazon-linux-2/

[ec2-user@ip-10-0-0-72 ~]$ sudo yum install java-17-amazon-corretto

after all the dependencies were downloaded, installed, and this completed, I verified:

[ec2-user@ip-10-0-0-72 ~]$ java -version

openjdk version "17.0.5" 2022-10-18 LTS

OpenJDK Runtime Environment Corretto-17.0.5.8.1 (build 17.0.5+8-LTS)

OpenJDK 64-Bit Server VM Corretto-17.0.5.8.1 (build 17.0.5+8-LTS, mixed mode, sharing)

Finally, I added a Bash script to /etc/profile.d to set JAVA_HOME and PATH to include JAVA_HOME. 

[ec2-user@ip-10-0-0-72 ~]$ sudo vi /etc/profile.d/java.sh

export JAVA_HOME=/usr/lib/jvm/java-17-amazon-corretto.x86_64

and sourced this Bash script so it would take effect immediately:

[ec2-user@ip-10-0-0-72 ~]$ source /etc/profile.d/java.sh

Step 2: Create Service to run Spring Boot App

Create java-user (in java-group) with a home directory of /opt/java-apps 

[ec2-user@ip-10-0-0-72 ~]$ sudo groupadd -r java-group

[ec2-user@ip-10-0-0-72 ~]$ sudo useradd -r -m -g java-group -d /opt/java-apps -s /bin/false java-user

                             

I copied the Spring Boot JAR into /opt/java-apps/demo.jar and created the following Systemctl Service file:

[root@ip-10-0-0-72 system]# sudo vi /etc/systemd/system/springboot.service

[Unit]
Description=Java Spring Boot Demo App
After=syslog.target

[Service]
WorkingDirectory=/opt/java-apps
ExecStart=/bin/java -jar demo.jar
SuccessExitStatus=143

User=java-user
Group=java-group

[Install]
WantedBy=multi-user.target