How do I troubleshoot "Port 8080 was already in use" with automated deployments with AWS CodeDeploy?

Question

I am practicing Spring Boot automatic deployment using Travis CI, AWS S3, and AWS CodeDeploy. Currently, if I do git push, automatic deployment is in progress, but the following problem occurs.

***************************
APPLICATION FAILED TO START
***************************

Description:

Web server failed to start. Port 8080 was already in use.

Action:

Identify and stop the process that's listening on port 8080 or configure this application to listen on another port.

So, I used the following command to check the process using port 8080.

sudo lsof -i TCP:8080

The user resulted in ec2-user. If I kill ec2-user with a kill pid to use port 8080, the server cannot be used. How to solve it?

[EDIT]

appspec.yml

hooks:
  ApplicationStart:
    - location: deploy.sh
      timeout: 60
      runas: ec2-user

deploy.sh

#!/bin/bash

REPOSITORY=/home/ec2-user/app/travis
PROJECT_NAME=springboot-test

echo "> Copy Build File"

cp $REPOSITORY/zip/*.jar $REPOSITORY/

echo "> confirm current application pid"

CURRENT_PID=$(pgrep -fl $PROJECT_NAME | grep jar | awk '{print $1}')

echo "> pid: $CURRENT_PID"

if [ -z "$CURRENT_PID" ]; then
  echo "> No application"
else
  echo "> kill -15 $CURRENT_PID"
  kill -15 $CURRENT_PID
  sleep 5
fi

echo "> Deploy new application"

JAR_NAME=$(ls -tr $REPOSITORY/*.jar | tail -n 1)

echo "> JAR Name: $JAR_NAME"

echo "> Add +x in $JAR_NAME"

chmod +x $JAR_NAME

echo "> run $JAR_NAME"

nohup java -jar \
  -Dspring.config.location=/home/ec2-user/app/application.yml \
  -Dspring.profiles.active=real \
  $JAR_NAME > $REPOSITORY/nohup.out 2>&1 &

Answer 1

You should add ApplicationStop hook into your appspec.yml. The hook is executed first, and you should define it so that it stops your web server.