# Spring Boot Cloud CLI

# Installation

To install, make sure you haveSpring Boot CLI (opens new window)(2.0.0 or better):

$ spring version
Spring CLI v2.2.3.RELEASE

E.g. for SDKMan users

$ sdk install springboot 2.2.3.RELEASE
$ sdk use springboot 2.2.3.RELEASE

and install the Spring Cloud plugin

$ mvn install
$ spring install org.springframework.cloud:spring-cloud-cli:2.2.0.RELEASE
Prerequisites: to use the encryption and decryption features
you need the full-strength JCE installed in your JVM (it’s not there by default).
You can download the "Java Cryptography Extension (JCE) Unlimited Strength Jurisdiction Policy Files"
from Oracle, and follow instructions for installation (essentially replace the 2 policy files
in the JRE lib/security directory with the ones that you downloaded).

# Running Spring Cloud Services in Development

The Launcher CLI can be used to run common services like Eureka, Config Server etc. from the command line. To list the available services you can do spring cloud --list, and to launch a default set of services just spring cloud. To choose the services to deploy, just list them on the command line, e.g.

$ spring cloud eureka configserver h2 kafka stubrunner zipkin

Summary of supported deployables:

Service Name Address Description
eureka Eureka Server http://localhost:8761 (opens new window) Eureka server for service registration and discovery. All the other services show up in its catalog by default.
configserver Config Server http://localhost:8888 (opens new window) Spring Cloud Config Server running in the "native" profile and serving configuration from the local directory ./launcher
h2 H2 Database http://localhost:9095 (opens new window) (console), jdbc:h2:tcp://localhost:9096/{data} Relation database service. Use a file path for {data} (e.g. ./target/test) when you connect. Remember that you can add ;MODE=MYSQL or ;MODE=POSTGRESQL to connect with compatibility to other server types.
kafka Kafka Broker http://localhost:9091 (opens new window) (actuator endpoints), localhost:9092
dataflow Dataflow Server http://localhost:9393 (opens new window) Spring Cloud Dataflow server with UI at /admin-ui. Connect the Dataflow shell to target at root path.
zipkin Zipkin Server http://localhost:9411 (opens new window) Zipkin Server with UI for visualizing traces. Stores span data in memory and accepts them via HTTP POST of JSON data.
stubrunner Stub Runner Boot http://localhost:8750 (opens new window) Downloads WireMock stubs, starts WireMock and feeds the started servers with stored stubs. Pass stubrunner.ids to pass stub coordinates and then go to [http://localhost:8750/stubs](http://localhost:8750/stubs).

Each of these apps can be configured using a local YAML file with the same name (in the current working directory or a subdirectory called "config" or in ~/.spring-cloud). E.g. in configserver.yml you might want to do something like this to locate a local git repository for the backend:

configserver.yml

spring:
  profiles:
    active: git
  cloud:
    config:
      server:
        git:
          uri: file://${user.home}/dev/demo/config-repo

E.g. in Stub Runner app you could fetch stubs from your local .m2 in the following way.

stubrunner.yml

stubrunner:
  workOffline: true
  ids:
    - com.example:beer-api-producer:+:9876

# Adding Additional Applications

Additional applications can be added to ./config/cloud.yml (not./config.yml because that would replace the defaults), e.g. with

config/cloud.yml

spring:
  cloud:
    launcher:
      deployables:
        source:
          coordinates: maven://com.example:source:0.0.1-SNAPSHOT
          port: 7000
        sink:
          coordinates: maven://com.example:sink:0.0.1-SNAPSHOT
          port: 7001

when you list the apps:

$ spring cloud --list
source sink configserver dataflow eureka h2 kafka stubrunner zipkin

(notice the additional apps at the start of the list).

# Writing Groovy Scripts and Running Applications

Spring Cloud CLI has support for most of the Spring Cloud declarative features, such as the @Enable* class of annotations. For example, here is a fully functional Eureka server

app.groovy

@EnableEurekaServer
class Eureka {}

which you can run from the command line like this

$ spring run app.groovy

To include additional dependencies, often it suffices just to add the appropriate feature-enabling annotation, e.g. @EnableConfigServer,@EnableOAuth2Sso or @EnableEurekaClient. To manually include a dependency you can use a @Grab with the special "Spring Boot" short style artifact co-ordinates, i.e. with just the artifact ID (no need for group or version information), e.g. to set up a client app to listen on AMQP for management events from the Spring CLoud Bus:

app.groovy

@Grab('spring-cloud-starter-bus-amqp')
@RestController
class Service {
  @RequestMapping('/')
  def home() { [message: 'Hello'] }
}

# Encryption and Decryption

The Spring Cloud CLI comes with an "encrypt" and a "decrypt" command. Both accept arguments in the same form with a key specified as a mandatory "--key", e.g.

$ spring encrypt mysecret --key foo
682bc583f4641835fa2db009355293665d2647dade3375c0ee201de2a49f7bda
$ spring decrypt --key foo 682bc583f4641835fa2db009355293665d2647dade3375c0ee201de2a49f7bda
mysecret

To use a key in a file (e.g. an RSA public key for encyption) prepend the key value with "@" and provide the file path, e.g.

$ spring encrypt mysecret --key @${HOME}/.ssh/id_rsa.pub
AQAjPgt3eFZQXwt8tsHAVv/QHiY5sI2dRcR+...