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Deploy Spring Boot Application to Fly.io

Since I haven't had an experience in Spring Boot application along with database(in my case PostgreSQL), I had hard time dockerizing it and deploying this for as development server. So I'm leaving this record of deploying Spring Boot application to fly.io with PostgreSQL database setup.


Previous Setup​

1. Before start, suppose you're using followings:​

  • JDK 11 (Java 11)
  • Gradle
  • PostgreSQL

2. fly.io Account​

Register your account at https://fly.io/app/sign-in.


Dockerfile Setup​

Generate Build File

$ ./gradlew clean build

then, build/ folder would be completely removed and then re-created.


Dockerfile

# Setup build file(.jar)
FROM adoptopenjdk/openjdk11 AS builder

WORKDIR /usr/src/app
ARG JAR_FILE=build/libs/*.jar
COPY ${JAR_FILE} app.jar

# Run .jar file copied from `builder` stage
FROM adoptopenjdk/openjdk11 AS runner

WORKDIR /usr/src/app
COPY --from=builder /usr/src/app/app.jar app.jar
EXPOSE 8080
CMD java -jar app.jar

Fly.io PostgreSQL Setup​

You need to set PostgreSQL database in your application.yml (or application.properties) file.

server:
  port: 8080

spring:
  datasource:
    # url: jdbc:postgresql://<host_name>:<port>/<database_name>
    url: jdbc:postgresql://localhost:5432/the_survey_dev 
    username: the_survey_dev # user's name
    password: the_survey_dev # user's password
  jpa:
    database-platform: org.hibernate.dialect.PostgreSQLDialect
    hibernate:
      ddl-auto: create

and then run followings

$ flyctl postgres create

# If you need any preset, then connect direct to created database by running 
# `flyctl postgres connect -a <YOUR_APP_NAME>`

Mount PostgreSQL machines (≤ flyctl==v0.0.530)​

flyctl-prev-error-message

Before flyctl version 0.0.531, you had to setup mounts with <machine id>s as follows:

$ fly machine list # check machine list and get `id`s
$ fly machine update --metadata fly_platform_version=v2 <machine id>

But the last command guide <machine id> was missing so I've requested a Pull Request and was accepted from flyctl pull request #2093 and reflected on v0.0.531.

And after v0.0.531 update, you'll see it's been updated by automatically adding machine's id when you create HA(High Availability) cluster.


Deploy to fly.io​

After you're all set, you could just deploy your application by running

$ fly launch
# Or if you already have Dockerfile and fly.toml config, you could just run `fly deploy`
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