Merge branch 'docs-article-cloud-foundry' into 'master'

Docs: article - Deploy SB apps to CF with GitLab CI/CD

Closes #47505 and #37524

See merge request gitlab-org/gitlab-ce!19540

doc/ci/examples/deploy_spring_boot_to_cloud_foundry/index.md

+---
+author: Dylan Griffith
+author_gitlab: DylanGriffith
+level: intermediary
+article_type: tutorial
+date: 2018-06-07
+description: "Continuous Deployment of a Spring Boot application to Cloud Foundry with GitLab CI/CD"
+---
+
+# Deploy a Spring Boot application to Cloud Foundry with GitLab CI/CD
+
+## Introduction
+
+In this article, we'll demonstrate how to deploy a [Spring
+Boot](https://projects.spring.io/spring-boot/) application to [Cloud
+Foundry (CF)](https://www.cloudfoundry.org/) with GitLab CI/CD using the [Continuous
+Deployment](https://about.gitlab.com/2016/08/05/continuous-integration-delivery-and-deployment-with-gitlab/#continuous-deployment)
+method.
+
+All the code for this project can be found in this [GitLab
+repo](https://gitlab.com/gitlab-examples/spring-gitlab-cf-deploy-demo).
+
+In case you're interested in deploying Spring Boot applications to Kubernetes
+using GitLab CI/CD, read through the blog post [Continuous Delivery of a Spring Boot application with GitLab CI and Kubernetes](https://about.gitlab.com/2016/12/14/continuous-delivery-of-a-spring-boot-application-with-gitlab-ci-and-kubernetes/).
+
+## Requirements
+
+_We assume you are familiar with Java, GitLab, Cloud Foundry, and GitLab CI/CD._
+
+To follow along with this tutorial you will need the following:
+
+- An account on [Pivotal Web Services (PWS)](https://run.pivotal.io/) or any
+  other Cloud Foundry instance
+- An account on GitLab
+
+NOTE: **Note:**
+You will need to replace the `api.run.pivotal.io` URL in the all below
+commands with the [API
+URL](https://docs.cloudfoundry.org/running/cf-api-endpoint.html) of your CF
+instance if you're not deploying to PWS.
+
+## Create your project
+
+To create your Spring Boot application you can use the Spring template in
+GitLab when creating a new project:
+
+![New Project From Template](img/create_from_template.png)
+
+## Configure the deployment to Cloud Foundry
+
+To deploy to Cloud Foundry we need to add a `manifest.yml` file. This
+is the configuration for the CF CLI we will use to deploy the application. We
+will create this in the root directory of our project with the following
+content:
+
+```yaml
+---
+applications:
+- name: gitlab-hello-world
+  random-route: true
+  memory: 1G
+  path: target/demo-0.0.1-SNAPSHOT.jar
+```
+
+## Configure GitLab CI/CD to deploy your application
+
+Now we need to add the the GitLab CI/CD configuration file
+([`.gitlab-ci.yml`](../../yaml/README.md)) to our
+project's root. This is how GitLab figures out what commands need to be run whenever
+code is pushed to our repository. We will add the following `.gitlab-ci.yml`
+file to the root directory of the repository, GitLab will detect it
+automatically and run the steps defined once we push our code:
+
+```yaml
+image: java:8
+
+stages:
+  - build
+  - deploy
+
+build:
+  stage: build
+  script: ./mvnw package
+  artifacts:
+    paths:
+      - target/demo-0.0.1-SNAPSHOT.jar
+
+production:
+  stage: deploy
+  script:
+  - curl --location "https://cli.run.pivotal.io/stable?release=linux64-binary&source=github" | tar zx
+  - ./cf login -u $CF_USERNAME -p $CF_PASSWORD -a api.run.pivotal.io
+  - ./cf push
+  only:
+  - master
+```
+
+We've used the `java:8` [docker
+image](../../docker/using_docker_images.md) to build
+our application as it provides the up-to-date Java 8 JDK on [Docker
+Hub](https://hub.docker.com/). We've also added the [`only`
+clause](../../yaml/README.md#only-and-except-simplified)
+to ensure our deployments only happen when we push to the master branch.
+
+Now, since the steps defined in `.gitlab-ci.yml` require credentials to login
+to CF, you'll need to add your CF credentials as [environment
+variables](../../variables/README.md#predefined-variables-environment-variables)
+on GitLab CI/CD. To set the environment variables, navigate to your project's
+**Settings > CI/CD** and expand **Secret Variables**. Name the variables
+`CF_USERNAME` and `CF_PASSWORD` and set them to the correct values.
+
+![Secret Variable Settings in GitLab](img/cloud_foundry_secret_variables.png)
+
+Once set up, GitLab CI/CD will deploy your app to CF at every push to your
+repository's deafult branch. To see the build logs or watch your builds running
+live, navigate to **CI/CD > Pipelines**.
+
+CAUTION: **Caution:**
+It is considered best practice for security to create a separate deploy
+user for your application and add its credentials to GitLab instead of using
+a developer's credentials.
+
+To start a manual deployment in GitLab go to **CI/CD > Pipelines** then click
+on **Run Pipeline**. Once the app is finished deploying it will display the URL
+of your application in the logs for the `production` job like:
+
+```shell
+requested state: started
+instances: 1/1
+usage: 1G x 1 instances
+urls: gitlab-hello-world-undissembling-hotchpot.cfapps.io
+last uploaded: Mon Nov 6 10:02:25 UTC 2017
+stack: cflinuxfs2
+buildpack: client-certificate-mapper=1.2.0_RELEASE container-security-provider=1.8.0_RELEASE java-buildpack=v4.5-offline-https://github.com/cloudfoundry/java-buildpack.git#ffeefb9 java-main java-opts jvmkill-agent=1.10.0_RELEASE open-jdk-like-jre=1.8.0_1...
+
+     state     since                    cpu      memory         disk           details
+#0   running   2017-11-06 09:03:22 PM   120.4%   291.9M of 1G   137.6M of 1G
+```
+
+You can then visit your deployed application (for this example,
+https://gitlab-hello-world-undissembling-hotchpot.cfapps.io/) and you should
+see the "Spring is here!" message.