spring boot auto deployment with git hooks and docker

spring boot auto deployment with git hooks and docker

1. create git bare repository on your server machine (for example a virtual machine rented from digital ocean)

  git init --bare
  
2. go hooks folder in git repo that created above and create post-receive.sh file 

3. in post-receive file write below:

#!/usr/bin/env bash

TARGET="/opt/my_app"
REPO="/opt/my_app_git"
TEMP="/tmp/my_app"


# Extracting source to temp directory.
rm -rf $TEMP
mkdir -p $TEMP
git --work-tree=$TEMP --git-dir=$REPO checkout -f

# copy project file from temp directory to the target directory
cd $TEMP
rm -rf $TARGET/*
mv $TEMP/* $TARGET

cd $TARGET

# remove existing container and image
docker stop <container name>
docker rm <container name>
docker rmi <image name>

# execute gradle build to create docker image
./gradlew build -x test -PactiveProfiles=integration buildDocker

# create docker container based on above image
docker run -d --network <docker network> -p 8081:8081 --name <container name> --ip 172.10.0.4 <image name>

# create connection between our docker network and above container
docker network connect --ip 172.10.0.4 <docker network> <container name>


4. prepare your spring boot project to integrate with docker

4.1. inside build.gradle put docker dependency in buildscript -> dependencies

buildscript {
	.
  .
  .
	dependencies {
		.
    .
    .
		classpath('se.transmode.gradle:gradle-docker:1.2')
	}
}

4.2. add below code at the bottom of the build.gradle file

task buildDocker(type: Docker, dependsOn: build) {
	push = true
	applicationName = jar.baseName
	dockerfile = file('src/main/docker/Dockerfile')
	doFirst {
		copy {
			from jar
			into stageDir
		}
	}
}

4.3. create Dockerfile in src/main/docker

FROM frolvlad/alpine-oraclejdk8:slim
VOLUME /tmp
ADD <your jar file name> app.jar
RUN sh -c 'touch /app.jar'
ENV JAVA_OPTS=""
ENTRYPOINT [ "sh", "-c", "java $JAVA_OPTS -Djava.security.egd=file:/dev/./urandom -jar /app.jar" ]

5. thats it. finally push your project to the bare repository in server machine

git push <my private repo> master

Good luck!!!

why not add git url ?