[[deployment]]
= Deploying Spring Boot applications

[partintro]
--
Spring Boot's flexible packaging options provide a great deal of choice when it comes to
deploying your application. You can easily deploy Spring Boot applications to a variety
of cloud platforms, to a container images (such as Docker) or to virtual/real machines.

This section covers some of the more common deployment scenarios.
--



[[cloud-deployment]]
== Deploying to the cloud
Spring Boot's executable jars are ready-made for most popular cloud PaaS
(platform-as-a-service) providers. These providers tend to require that you
"`bring your own container`"; they manage application processes (not Java applications
specifically), so they need some intermediary layer that adapts _your_ application to the
_cloud's_ notion of a running process.

Two popular cloud providers, Heroku and Cloud Foundry, employ a "`buildpack`" approach.
The buildpack wraps your deployed code in whatever is needed to _start_ your
application: it might be a JDK and a call to `java`, it might be an embedded web server,
or it might be a full-fledged application server. A buildpack is pluggable, but ideally
you should be able to get by with as few customizations to it as possible.
This reduces the footprint of functionality that is not under your control. It minimizes
divergence between development and production environments.

Ideally, your application, like a Spring Boot executable jar, has everything that it needs
to run packaged within it.

In this section we'll look at what it takes to get the
<<getting-started.adoc#getting-started-first-application, simple application that we
developed>> in the "`Getting Started`" section up and running in the Cloud.



[[cloud-deployment-cloud-foundry]]
=== Cloud Foundry
Cloud Foundry provides default buildpacks that come into play if no other buildpack is
specified. The Cloud Foundry https://github.com/cloudfoundry/java-buildpack[Java buildpack]
has excellent support for Spring applications, including Spring Boot.  You can deploy
stand-alone executable jar applications, as well as traditional `.war` packaged
applications.

Once you've built your application (using, for example, `mvn clean package`) and
http://docs.cloudfoundry.org/devguide/installcf/install-go-cli.html[installed the `cf`
command line tool], simply deploy your application using the `cf push` command as follows,
substituting the path to your compiled `.jar`. Be sure to have
http://docs.cloudfoundry.org/devguide/installcf/whats-new-v6.html#login[logged in with your
`cf` command line client] before pushing an application.

[indent=0,subs="verbatim,quotes,attributes"]
----
	$ cf push acloudyspringtime -p target/demo-0.0.1-SNAPSHOT.jar
----

See the http://docs.cloudfoundry.org/devguide/installcf/whats-new-v6.html#push[`cf push`
documentation] for more options. If there is a Cloud Foundry
http://docs.cloudfoundry.org/devguide/deploy-apps/manifest.html[`manifest.yml`]
file present in the same directory, it will be consulted.

NOTE: Here we are substituting `acloudyspringtime` for whatever value you give `cf`
as the name of your application.

At this point `cf` will start uploading your application:

[indent=0,subs="verbatim,quotes,attributes"]
----
	Uploading acloudyspringtime... *OK*
	Preparing to start acloudyspringtime... *OK*
	-----> Downloaded app package (*8.9M*)
	-----> Java Buildpack source: system
	-----> Downloading Open JDK 1.7.0_51 from .../x86_64/openjdk-1.7.0_51.tar.gz (*1.8s*)
	       Expanding Open JDK to .java-buildpack/open_jdk (*1.2s*)
	-----> Downloading Spring Auto Reconfiguration from  0.8.7 .../auto-reconfiguration-0.8.7.jar (*0.1s*)
	-----> Uploading droplet (*44M*)
	Checking status of app 'acloudyspringtime'...
	  0 of 1 instances running (1 starting)
	  ...
	  0 of 1 instances running (1 down)
	  ...
	  0 of 1 instances running (1 starting)
	  ...
	  1 of 1 instances running (1 running)

	App started
----

Congratulations! The application is now live!

It's easy to then verify the status of the deployed application:

[indent=0,subs="verbatim,quotes,attributes"]
----
	$ cf apps
	Getting applications in ...
	OK

	name                 requested state   instances   memory   disk   urls
	...
	acloudyspringtime    started           1/1         512M     1G     acloudyspringtime.cfapps.io
	...
----

Once Cloud Foundry acknowledges that your application has been deployed, you should be
able to hit the application at the URI given, in this case
`\http://acloudyspringtime.cfapps.io/`.



[[cloud-deployment-cloud-foundry-services]]
==== Binding to services
By default, metadata about the running application as well as service connection
information is exposed to the application as environment variables (for example:
`$VCAP_SERVICES`). This architecture decision is due to Cloud Foundry's polyglot
(any language and platform can be supported as a buildpack) nature; process-scoped
environment variables are language agnostic.

Environment variables don't always make for the easiest API so Spring Boot automatically
extracts them and flattens the data into properties that can be accessed through
Spring's `Environment` abstraction:

[source,java,indent=0]
----
	@Component
	class MyBean implements EnvironmentAware {

		private String instanceId;

		@Override
		public void setEnvironment(Environment environment) {
			this.instanceId = environment.getProperty("vcap.application.instance_id");
		}

		// ...

	}
----

All Cloud Foundry properties are prefixed with `vcap`. You can use vcap properties to
access application information (such as the public URL of the application) and service
information (such as database credentials). See `CloudFoundryVcapEnvironmentPostProcessor`
Javadoc for complete details.

TIP: The http://cloud.spring.io/spring-cloud-connectors/[Spring Cloud Connectors] project
is a better fit for tasks such as configuring a DataSource. Spring Boot includes
auto-configuration support and a `spring-boot-starter-cloud-connectors` starter.



[[cloud-deployment-heroku]]
=== Heroku
Heroku is another popular PaaS platform. To customize Heroku builds, you provide a
`Procfile`, which provides the incantation required to deploy an application. Heroku
assigns a `port` for the Java application to use and then ensures that routing to the
external URI works.

You must configure your application to listen on the correct port. Here's the `Procfile`
for our starter REST application:

[indent=0]
----
	web: java -Dserver.port=$PORT -jar target/demo-0.0.1-SNAPSHOT.jar
----

Spring Boot makes `-D` arguments available as properties accessible from a Spring
`Environment` instance. The `server.port` configuration property is fed to the embedded
Tomcat, Jetty or Undertow instance which then uses it when it starts up. The `$PORT`
environment variable is assigned to us by the Heroku PaaS.

Heroku by default will use Java 1.8. This is fine as long as your Maven or Gradle build
is set to use the same version (Maven users can use the java.version property). If you
want to use JDK 1.7, create a new file adjacent to your `pom.xml` and `Procfile`,
called `system.properties`. In this file add the following:

[indent=0]
----
	java.runtime.version=1.7
----

This should be everything you need. The most common workflow for Heroku deployments is to
`git push` the code to production.

[indent=0,subs="verbatim,quotes,attributes"]
----
	$ git push heroku master

	Initializing repository, *done*.
	Counting objects: 95, *done*.
	Delta compression using up to 8 threads.
	Compressing objects: 100% (78/78), *done*.
	Writing objects: 100% (95/95), 8.66 MiB | 606.00 KiB/s, *done*.
	Total 95 (delta 31), reused 0 (delta 0)

	-----> Java app detected
	-----> Installing OpenJDK 1.8... *done*
	-----> Installing Maven 3.3.1... *done*
	-----> Installing settings.xml... *done*
	-----> Executing: mvn -B -DskipTests=true clean install

	       [INFO] Scanning for projects...
	       Downloading: http://repo.spring.io/...
	       Downloaded: http://repo.spring.io/... (818 B at 1.8 KB/sec)
			....
	       Downloaded: http://s3pository.heroku.com/jvm/... (152 KB at 595.3 KB/sec)
	       [INFO] Installing /tmp/build_0c35a5d2-a067-4abc-a232-14b1fb7a8229/target/...
	       [INFO] Installing /tmp/build_0c35a5d2-a067-4abc-a232-14b1fb7a8229/pom.xml ...
	       [INFO] ------------------------------------------------------------------------
	       [INFO] *BUILD SUCCESS*
	       [INFO] ------------------------------------------------------------------------
	       [INFO] Total time: 59.358s
	       [INFO] Finished at: Fri Mar 07 07:28:25 UTC 2014
	       [INFO] Final Memory: 20M/493M
	       [INFO] ------------------------------------------------------------------------

	-----> Discovering process types
	       Procfile declares types -> *web*

	-----> Compressing... *done*, 70.4MB
	-----> Launching... *done*, v6
	       http://agile-sierra-1405.herokuapp.com/ *deployed to Heroku*

	To git@heroku.com:agile-sierra-1405.git
	 * [new branch]      master -> master
----

Your application should now be up and running on Heroku.



[[cloud-deployment-openshift]]
=== OpenShift
https://www.openshift.com/[OpenShift] is the RedHat public (and enterprise) PaaS solution.
Like Heroku, it works by running scripts triggered by git commits, so you can script
the launching of a Spring Boot application in pretty much any way you like as long as the
Java runtime is available (which is a standard feature you can ask for at OpenShift).
To do this you can use the
https://www.openshift.com/developers/do-it-yourself[DIY Cartridge] and hooks in your
repository under `.openshift/action_hooks`:

The basic model is to:

1. Ensure Java and your build tool are installed remotely, e.g. using a `pre_build` hook
   (Java and Maven are installed by default, Gradle is not)
2. Use a `build` hook to build your jar (using Maven or Gradle), e.g.
+
[indent=0]
----
	#!/bin/bash
	cd $OPENSHIFT_REPO_DIR
	mvn package -s .openshift/settings.xml -DskipTests=true
----
+
3. Add a `start` hook that calls `java -jar ...`
+
[indent=0]
----
	#!/bin/bash
	cd $OPENSHIFT_REPO_DIR
	nohup java -jar target/*.jar --server.port=${OPENSHIFT_DIY_PORT} --server.address=${OPENSHIFT_DIY_IP} &
----
+
4. Use a `stop` hook (since the start is supposed to return cleanly), e.g.
+
[indent=0]
----
	#!/bin/bash
	source $OPENSHIFT_CARTRIDGE_SDK_BASH
	PID=$(ps -ef | grep java.*\.jar | grep -v grep | awk '{ print $2 }')
	if [ -z "$PID" ]
	then
	    client_result "Application is already stopped"
	else
	    kill $PID
	fi
----
+
5. Embed service bindings from environment variables provided by the platform
in your `application.properties`, e.g.
+
[indent=0]
----
	spring.datasource.url: jdbc:mysql://${OPENSHIFT_MYSQL_DB_HOST}:${OPENSHIFT_MYSQL_DB_PORT}/${OPENSHIFT_APP_NAME}
	spring.datasource.username: ${OPENSHIFT_MYSQL_DB_USERNAME}
	spring.datasource.password: ${OPENSHIFT_MYSQL_DB_PASSWORD}
----

There's a blog on https://www.openshift.com/blogs/run-gradle-builds-on-openshift[running
Gradle in OpenShift] on their website that will get you started with a gradle build to
run the app.



[[cloud-deployment-aws]]
=== Amazon Web Services (AWS)
Amazon Web Services offers multiple ways to install Spring Boot based applications, either
as traditional web applications (war) or as executable jar files with an embedded web
server. Options include :

* AWS Elastic Beanstalk
* AWS Code Deploy
* AWS OPS Works
* AWS Cloud Formation
* AWS Container Registry

Each has different features and pricing model, here we will describe only the simplest
option : AWS Elastic Beanstalk.



==== AWS Elastic Beanstalk
As described in the official http://docs.aws.amazon.com/elasticbeanstalk/latest/dg/create_deploy_Java.html[Elastic
Beanstalk Java guide], there are two main options to deploy a Java application; You can
either us the "`Tomcat Platform`" or the "`Java SE platform`".



===== Using the Tomcat platform
This option applies to Spring Boot projects producing a war file. There is no any special
configuration required, just follow the official guide.



===== Using the Java SE platform
This option applies to Spring Boot projects producing a jar file and running an embedded
web container. Elastic Beanstalk environments run an nginx instance on port 80 to proxy
the actual application, running on port 5000. To configure it, add the following to your
`application.properties`:

[indent=0]
----
	server.port=5000
----



===== Best practices

====== Uploading binaries instead of sources
By default Elastic Beanstalk uploads sources and compile them in AWS. To upload the
binaries instead, add the following to your `.elasticbeanstalk/config.yml` file:



[source,xml,indent=0,subs="verbatim,quotes,attributes"]
----
	deploy:
		artifact: target/demo-0.0.1-SNAPSHOT.jar
----



====== Reduce costs by setting the environment type
By default an Elastic Beanstalk environment is load balanced. The load balancer has a cost
perspective, to avoid it, set the environment type to "`Single instance`" as described
http://docs.aws.amazon.com/elasticbeanstalk/latest/dg/environments-create-wizard.html#environments-create-wizard-capacity[in the Amazon documentation].
Single instance environments can be created using the CLI as well using the following
command:

[indent=0]
----
	eb create -s
----



==== Summary
This is one of the easiest way to get to AWS, but there are more things
to cover, e.g.: how to integrate Elastic Beanstalk into any CI / CD tool, using the
Elastic Beanstalk maven plugin instead of the CLI, etc. There is a
https://exampledriven.wordpress.com/2017/01/09/spring-boot-aws-elastic-beanstalk-example/[blog]
covering these topics more in detail.



[[cloud-deployment-boxfuse]]
=== Boxfuse and Amazon Web Services
https://boxfuse.com/[Boxfuse] works by turning your Spring Boot executable jar or war
into a minimal VM image that can be deployed unchanged either on VirtualBox or on AWS.
Boxfuse comes with deep integration for Spring Boot and will use the information from your
Spring Boot configuration file to automatically configure ports and health check URLs.
Boxfuse leverages this information both for the images it produces as well as for all the
resources it provisions (instances, security groups, elastic load balancers, etc).

Once you have created a https://console.boxfuse.com[Boxfuse account], connected it to your
AWS account, and installed the latest version of the Boxfuse Client, you can deploy your
Spring Boot application to AWS as follows (ensure the application has been built by
Maven or Gradle first using, for example, `mvn clean package`):

[indent=0]
----
	$ boxfuse run myapp-1.0.jar -env=prod
----

See the https://boxfuse.com/docs/commandline/run.html[`boxfuse run` documentation] for
more options. If there is a https://boxfuse.com/docs/commandline/#configuration
[`boxfuse.conf`] file present in the current directory, it will be consulted.

TIP: By default Boxfuse will activate a Spring profile named `boxfuse` on startup and if
your executable jar or war contains an
https://boxfuse.com/docs/payloads/springboot.html#configuration
[`application-boxfuse.properties`]
file, Boxfuse will base its configuration based on the properties it contains.

At this point `boxfuse` will create an image for your application, upload it,
and then configure and start the necessary resources on AWS:

[indent=0,subs="verbatim,quotes,attributes"]
----
	Fusing Image for myapp-1.0.jar ...
	Image fused in 00:06.838s (53937 K) -> axelfontaine/myapp:1.0
	Creating axelfontaine/myapp ...
	Pushing axelfontaine/myapp:1.0 ...
	Verifying axelfontaine/myapp:1.0 ...
	Creating Elastic IP ...
	Mapping myapp-axelfontaine.boxfuse.io to 52.28.233.167 ...
	Waiting for AWS to create an AMI for axelfontaine/myapp:1.0 in eu-central-1 (this may take up to 50 seconds) ...
	AMI created in 00:23.557s -> ami-d23f38cf
	Creating security group boxfuse-sg_axelfontaine/myapp:1.0 ...
	Launching t2.micro instance of axelfontaine/myapp:1.0 (ami-d23f38cf) in eu-central-1 ...
	Instance launched in 00:30.306s -> i-92ef9f53
	Waiting for AWS to boot Instance i-92ef9f53 and Payload to start at http://52.28.235.61/ ...
	Payload started in 00:29.266s -> http://52.28.235.61/
	Remapping Elastic IP 52.28.233.167 to i-92ef9f53 ...
	Waiting 15s for AWS to complete Elastic IP Zero Downtime transition ...
	Deployment completed successfully. axelfontaine/myapp:1.0 is up and running at http://myapp-axelfontaine.boxfuse.io/
----

Your application should now be up and running on AWS.

There's a blog on https://boxfuse.com/blog/spring-boot-ec2.html[deploying Spring Boot apps
on EC2] as well as https://boxfuse.com/docs/payloads/springboot.html[documentation
for the Boxfuse Spring Boot integration] on their website that will get you started with a
Maven build to run the app.



[[cloud-deployment-gae]]
=== Google App Engine
Google App Engine is tied to the Servlet 2.5 API, so you can't deploy a Spring Application
there without some modifications. See the <<howto.adoc#howto-servlet-2-5, Servlet 2.5 section>>
of this guide.



[[deployment-install]]
== Installing Spring Boot applications
In additional to running Spring Boot applications using `java -jar` it is also possible
to make fully executable applications for Unix systems. This makes it very easy to install
and manage Spring Boot applications in common production environments.

To create a '`fully executable`' jar with Maven use the following plugin configuration:

[source,xml,indent=0,subs="verbatim,quotes,attributes"]
----
	<plugin>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-maven-plugin</artifactId>
		<configuration>
			<executable>true</executable>
		</configuration>
	</plugin>
----

With Gradle, the equivalent configuration would be:

[source,groovy,indent=0,subs="verbatim,quotes,attributes"]
----
	springBoot {
		executable = true
	}
----

You can then run your application by typing `./my-application.jar` (where
`my-application` is the name of your artifact).

NOTE: Fully executable jars work by embedding an extra script at the front of the file.
Not all tools currently accept this format so you may not always be able to use this
technique.

NOTE: The default script supports most Linux distributions and is tested on CentOS and
Ubuntu. Other platforms, such as OS X and FreeBSD, will require the use of a custom
`embeddedLaunchScript`.

NOTE: When a fully executable jar is run, it uses the jar's directory as the working
directory.



[[deployment-service]]
=== Unix/Linux services
Spring Boot application can be easily started as Unix/Linux services using either `init.d`
or `systemd`.


[[deployment-initd-service]]
==== Installation as an init.d service (System V)
If you've configured Spring Boot's Maven or Gradle plugin to generate a
<<deployment-install,fully executable jar>>, and you're not using a custom
`embeddedLaunchScript`, then your application can be used as an `init.d` service. Simply
symlink the jar to `init.d` to support the standard `start`, `stop`, `restart` and
`status` commands.

The script supports the following features:

* Starts the services as the user that owns the jar file
* Tracks application's PID using `/var/run/<appname>/<appname>.pid`
* Writes console logs to `/var/log/<appname>.log`

Assuming that you have a Spring Boot application installed in `/var/myapp`, to install a
Spring Boot application as an `init.d` service simply create a symlink:

[indent=0,subs="verbatim,quotes,attributes"]
----
	$ sudo ln -s /var/myapp/myapp.jar /etc/init.d/myapp
----

Once installed, you can start and stop the service in the usual way. For example, on a
Debian based system:

[indent=0,subs="verbatim,quotes,attributes"]
----
	$ service myapp start
----

TIP: If your application fails to start, check the log file written to
`/var/log/<appname>.log` for errors.

You can also flag the application to start automatically using your standard operating
system tools. For example, on Debian:

[indent=0,subs="verbatim,quotes,attributes"]
----
	$ update-rc.d myapp defaults <priority>
----



[[deployment-initd-service-securing]]
===== Securing an init.d service

NOTE: The following is a set of guidelines on how to secure a Spring Boot application
that's being run as an init.d service. It is not intended to be an exhaustive list of
everything that should be done to harden an application and the environment in which it
runs.

When executed as root, as is the case when root is being used to start an init.d service,
the default executable script will run the application as the user which owns the jar
file. You should never run a Spring Boot application as `root` so your application's jar
file should never be owned by root. Instead, create a specific user to run your
application and use `chown` to make it the owner of the jar file. For example:

[indent=0,subs="verbatim,quotes,attributes"]
----
	$ chown bootapp:bootapp your-app.jar
----

In this case, the default executable script will run the application as the `bootapp`
user.

TIP: To reduce the chances of the application's user account being compromised, you should
consider preventing it from using a login shell. Set the account's shell to
`/usr/sbin/nologin`, for example.

You should also take steps to prevent the modification of your application's jar file.
Firstly, configure its permissions so that it cannot be written and can only be read or
executed by its owner:

[indent=0,subs="verbatim,quotes,attributes"]
----
	$ chmod 500 your-app.jar
----

Secondly, you should also take steps to limit the damage if your application or the
account that's running it is compromised. If an attacker does gain access, they could make
the jar file writable and change its contents. One way to protect against this is to make
it immutable using `chattr`:

[indent=0,subs="verbatim,quotes,attributes"]
----
	$ sudo chattr +i your-app.jar
----

This will prevent any user, including root, from modifying the jar.

If root is used to control the application's service and you
<<deployment-script-customization-conf-file, use a `.conf` file>> to customize its
startup, the `.conf` file will be read and evaluated by the root user. It should be
secured accordingly. Use `chmod` so that the file can only be read by the owner and use
`chown` to make root the owner:

[indent=0,subs="verbatim,quotes,attributes"]
----
	$ chmod 400 your-app.conf
	$ sudo chown root:root your-app.conf
----



[[deployment-systemd-service]]
==== Installation as a systemd service
Systemd is the successor of the System V init system, and is now being used by many modern
Linux distributions. Although you can continue to use `init.d` scripts with `systemd`, it
is also possible to launch Spring Boot applications using `systemd` '`service`' scripts.

Assuming that you have a Spring Boot application installed in `/var/myapp`, to install a
Spring Boot application as a `systemd` service create a script named `myapp.service` using
the following example and place it in `/etc/systemd/system` directory:

[indent=0]
----
	[Unit]
	Description=myapp
	After=syslog.target

	[Service]
	User=myapp
	ExecStart=/var/myapp/myapp.jar
	SuccessExitStatus=143

	[Install]
	WantedBy=multi-user.target
----

TIP: Remember to change the `Description`, `User` and `ExecStart` fields for your
application.

TIP: Note that `ExecStart` field does not declare the script action command, which means
that `run` command is used by default.

Note that unlike when running as an `init.d` service, user that runs the application, PID
file and console log file are managed by `systemd` itself and therefore must be configured
using appropriate fields in '`service`' script. Consult the
http://www.freedesktop.org/software/systemd/man/systemd.service.html[service unit
configuration man page] for more details.

To flag the application to start automatically on system boot use the following command:

[indent=0,subs="verbatim,quotes,attributes"]
----
	$ systemctl enable myapp.service
----

Refer to `man systemctl` for more details.



[[deployment-script-customization]]
==== Customizing the startup script
The default embedded startup script written by the Maven or Gradle plugin can be
customized in a number of ways. For most people, using the default script along with
a few customizations is usually enough. If you find you can't customize something that
you need to, you can always use the `embeddedLaunchScript` option to write your own
file entirely.



[[deployment-script-customization-when-it-written]]
===== Customizing script when it's written
It often makes sense to customize elements of the start script as it's written into the
jar file. For example, init.d scripts can provide a "`description`" and, since you know
this up front (and it won't change), you may as well provide it when the jar is generated.

To customize written elements, use the `embeddedLaunchScriptProperties` option of the
Spring Boot Maven or Gradle plugins.

The following property substitutions are supported with the default script:

[cols="1,6"]
|===
|Name |Description

|`mode`
|The script mode. Defaults to `auto`.

|`initInfoProvides`
|The `Provides` section of "`INIT INFO`". Defaults to `spring-boot-application` for Gradle
 and to `${project.artifactId}` for Maven.

|`initInfoRequiredStart`
|The `Required-Start` section of "`INIT INFO`". Defaults to `$remote_fs $syslog $network`.

|`initInfoRequiredStop`
|The `Required-Stop` section of "`INIT INFO`". Defaults to `$remote_fs $syslog $network`.


|`initInfoDefaultStart`
|The `Default-Start` section of "`INIT INFO`". Defaults to `2 3 4 5`.

|`initInfoDefaultStop`
|The `Default-Stop` section of "`INIT INFO`". Defaults to `0 1 6`.

|`initInfoShortDescription`
|The `Short-Description` section of "`INIT INFO`". Defaults to `Spring Boot Application`
for Gradle and to `${project.name}` for Maven.

|`initInfoDescription`
|The `Description` section of "`INIT INFO`". Defaults to `Spring Boot Application` for
 Gradle and to `${project.description}` (falling back to `${project.name}`) for Maven.

|`initInfoChkconfig`
|The `chkconfig` section of "`INIT INFO`". Defaults to `2345 99 01`.

|`confFolder`
|The default value for `CONF_FOLDER`. Defaults to the folder containing the jar.

|`logFolder`
|The default value for `LOG_FOLDER`. Only valid for an `init.d` service.

|`logFilename`
|The default value for `LOG_FILENAME`. Only valid for an `init.d` service.

|`pidFolder`
|The default value for `PID_FOLDER`. Only valid for an `init.d` service.

|`pidFilename`
|The default value for the name of the pid file in `PID_FOLDER`. Only valid for an
 `init.d` service.

|`useStartStopDaemon`
|If the `start-stop-daemon` command, when it's available, should be used to control the
 process. Defaults to `true`.

|`stopWaitTime`
|The default value for `STOP_WAIT_TIME`. Only valid for an `init.d` service.
 Defaults to 60 seconds.
|===


[[deployment-script-customization-when-it-runs]]
===== Customizing script when it runs
For items of the script that need to be customized _after_ the jar has been written you
can use environment variables or a
<<deployment-script-customization-conf-file, config file>>.

The following environment properties are supported with the default script:

[cols="1,6"]
|===
|Variable |Description

|`MODE`
|The "`mode`" of operation. The default depends on the way the jar was built, but will
 usually be `auto` _(meaning it tries to guess if it is an init script by checking if it
 is a symlink in a directory called `init.d`)_. You can explicitly set it to `service` so
 that the `stop\|start\|status\|restart` commands work, or to `run` if you just want to
 run the script in the foreground.

|`USE_START_STOP_DAEMON`
|If the `start-stop-daemon` command, when it's available, should be used to control the
 process. Defaults to `true`.

|`PID_FOLDER`
|The root name of the pid folder (`/var/run` by default).

|`LOG_FOLDER`
|The name of the folder to put log files in (`/var/log` by default).

|`CONF_FOLDER`
|The name of the folder to read .conf files from (same folder as jar-file by default).

|`LOG_FILENAME`
|The name of the log file in the `LOG_FOLDER` (`<appname>.log` by default).

|`APP_NAME`
|The name of the app. If the jar is run from a symlink the script guesses the app name,
 but if it is not a symlink, or you want to explicitly set the app name this can be
 useful.

|`RUN_ARGS`
|The arguments to pass to the program (the Spring Boot app).

|`JAVA_HOME`
|The location of the `java` executable is discovered by using the `PATH` by default, but
 you can set it explicitly if there is an executable file at `$JAVA_HOME/bin/java`.

|`JAVA_OPTS`
|Options that are passed to the JVM when it is launched.

|`JARFILE`
|The explicit location of the jar file, in case the script is being used to launch a jar
 that it is not actually embedded in.

|`DEBUG`
|if not empty will set the `-x` flag on the shell process, making it easy to see the logic
 in the script.

|`STOP_WAIT_TIME`
|The time in seconds to wait when stopping the application before forcing a shutdown
 (`60` by default).
|===

NOTE: The `PID_FOLDER`, `LOG_FOLDER` and `LOG_FILENAME` variables are only valid for an
`init.d` service. With `systemd` the equivalent customizations are made using '`service`'
script. Check the
http://www.freedesktop.org/software/systemd/man/systemd.service.html[service unit
configuration man page] for more details.

[[deployment-script-customization-conf-file]]
With the exception of `JARFILE` and `APP_NAME`, the above settings can be configured using
a `.conf` file. The file is expected next to the jar file and have the same name but
suffixed with `.conf` rather than `.jar`. For example, a jar named `/var/myapp/myapp.jar`
will use the configuration file named `/var/myapp/myapp.conf`.

.myapp.conf
[indent=0,subs="verbatim,quotes,attributes"]
----
	JAVA_OPTS=-Xmx1024M
	LOG_FOLDER=/custom/log/folder
----

TIP: You can use a `CONF_FOLDER` environment variable to customize the location of the
config file if you don't like it living next to the jar.

To learn about securing this file appropriately, please refer to
<<deployment-initd-service-securing,the guidelines for securing an init.d service>>.


[[deployment-windows]]
=== Microsoft Windows services
Spring Boot application can be started as Windows service using
https://github.com/kohsuke/winsw[`winsw`].

A sample https://github.com/snicoll-scratches/spring-boot-daemon[maintained separately]
to the core of Spring Boot describes step-by-step how you can create a Windows service for
your Spring Boot application.



[[deployment-whats-next]]
== What to read next
Check out the http://www.cloudfoundry.com/[Cloud Foundry],
https://www.heroku.com/[Heroku], https://www.openshift.com[OpenShift] and
https://boxfuse.com[Boxfuse] web sites for more information about the kinds of features
that a PaaS can offer. These are just four of the most popular Java PaaS providers, since
Spring Boot is so amenable to cloud-based deployment you're free to consider other
providers as well.

The next section goes on to cover the _<<spring-boot-cli.adoc#cli, Spring Boot CLI>>_;
or you can jump ahead to read about
_<<build-tool-plugins.adoc#build-tool-plugins, build tool plugins>>_.

