Migrating from Bamboo

DETAILS: Tier: Free, Premium, Ultimate Offering: GitLab.com, Self-managed, GitLab Dedicated

This migration guide looks at how you can migrate from Atlassian Bamboo to GitLab CI/CD. The focus is on Bamboo Specs YAML exported from the Bamboo UI or stored in Spec repositories.

GitLab CI/CD Primer

If you are new to GitLab CI/CD, use the Getting started guide to learn the basic concepts and how to create your first .gitlab-ci.yml file. If you already have some experience using GitLab CI/CD, you can review CI/CD YAML syntax reference to see the full list of available keywords.

You can also take a look at Auto DevOps, which automatically builds, tests, and deploys your application using a collection of pre-configured features and integrations.

Key similarities and differences

Offerings

Atlassian offers Bamboo in its Cloud (SaaS) or Data center (Self-managed) options. A third Server option is scheduled for EOL on February 15, 2024.

These options are similar to GitLab SaaS and Self-Managed. GitLab also offers GitLab Dedicated, a fully isolated single-tenant SaaS service.

Agents vs Runners

Bamboo uses agents to run builds and deployments. Agents can be local agents running on the Bamboo server or remote agents running external to the server.

GitLab uses a similar concept to agents called runners which use executors to run builds.

Examples of executors are shell, Docker, or Kubernetes. You can choose to use GitLab SaaS runners or deploy your own self-managed runners.

Workflow

Bamboo workflow is organized into projects. Projects are used to organize Plans, along with variables, shared credentials, and permissions needed by multiple plans. A plan groups jobs into stages and links to code repositories where applications to be built are hosted. Repositories could be in Bitbucket, GitLab, or other services.

A job is a series of tasks that are executed sequentially on the same Bamboo agent. CI and deployments are treated separately in Bamboo. Deployment project workflow is different from the build plans workflow. Learn more about Bamboo workflow.

GitLab CI/CD uses a similar workflow. Jobs are organized into stages, and projects have individual .gitlab-ci.yml configuration files or include existing templates.

Templating & Configuration as Code

Bamboo Specs

Bamboo plans can be configured in either the Web UI or with Bamboo Specs. Bamboo Specs is configuration as code, which can be written in Java or YAML. YAML Specs is the easiest to use but lacks in Bamboo feature coverage. Java Specs has complete Bamboo feature coverage and can be written in any JVM language like Groovy, Scala, or Kotlin. If you configured your plans using the Web UI, you can export your Bamboo configuration into Bamboo Specs.

Bamboo Specs can also be repository-stored.

`.gitlab-ci.yml` configuration file

GitLab, by default, uses a .gitlab-ci.yml file for CI/CD configuration. Alternatively, Auto DevOps can automatically build, test, and deploy your application without a manually configured .gitlab-ci.yml file.

GitLab CI/CD configuration can be organized into templates that are reusable across projects. GitLab also provides pre-built templates that help you get started quickly and avoid re-inventing the wheel.

Configuration

Bamboo YAML Spec syntax

This Bamboo Spec was exported from a Bamboo Server instance, which creates quite verbose output:

version: 2
plan:
  project-key: AB
  key: TP
  name: test plan
stages:
- Default Stage:
    manual: false
    final: false
    jobs:
    - Default Job
Default Job:
  key: JOB1
  tasks:
  - checkout:
      force-clean-build: false
      description: Checkout Default Repository
  - script:
      interpreter: SHELL
      scripts:
      - |-
        ruby -v  # Print out ruby version for debugging
        bundle config set --local deployment true  # Install dependencies into ./vendor/ruby
        bundle install -j $(nproc)
        rubocop
        rspec spec
      description: run bundler
  artifact-subscriptions: []
repositories:
- Demo Project:
    scope: global
triggers:
- polling:
    period: '180'
branches:
  create: manually
  delete: never
  link-to-jira: true
notifications: []
labels: []
dependencies:
  require-all-stages-passing: false
  enabled-for-branches: true
  block-strategy: none
  plans: []
other:
  concurrent-build-plugin: system-default

---

version: 2
plan:
  key: AB-TP
plan-permissions:
- users:
  - root
  permissions:
  - view
  - edit
  - build
  - clone
  - admin
  - view-configuration
- roles:
  - logged-in
  - anonymous
  permissions:
  - view
...

A GitLab CI/CD .gitlab-ci.yml configuration with similar behavior would be:

default:
  image: ruby:latest

stages:
- default-stage

job1:
  stage: default-stage
  script:
    - ruby -v  # Print out ruby version for debugging
    - bundle config set --local deployment true  # Install dependencies into ./vendor/ruby
    - bundle install -j $(nproc)
    - rubocop
    - rspec spec

Common Configurations

This section reviews some common Bamboo configurations and the GitLab CI/CD equivalents.

Workflow

Bamboo is structured differently compared to GitLab CI/CD. With GitLab, CI/CD can be enabled in a project in a number of ways: by adding a .gitlab-ci.yml file to the project, the existence of a Compliance pipeline in the group the project belongs to, or enabling AutoDevOps. Pipelines are then triggered automatically, depending on rules or context, where AutoDevOps is used.

Bamboo is structured differently, repositories need to be added to a Bamboo project, with authentication provided and triggers are set. Repositories added to projects are available to all plans in the project. Plans used for testing and building applications are called Build plans.

Build Plans

Build Plans in Bamboo are composed of Stages that run sequentially to build an application and generate artifacts where relevant. Build Plans require a default repository attached to it or inherit linked repositories from its parent project. Variables, triggers, and relationships between different plans can be defined at the plan level.

An example of a Bamboo build plan:

version: 2
plan:
  project-key: SAMPLE
  name: Build Ruby App
  key: BUILD-APP

stages:
  - Test App:
      jobs:
        - Test Application
        - Perform Security checks
  - Build App:
      jobs:
        - Build Application

Test Application:
  tasks:
    - script:
        - # Run tests

Perform Security checks:
  tasks:
    - script:
        - # Run Security Checks

Build Application:
  tasks:
    - script:
        - # Run buils

In this example:

Plan Specs include a YAML Spec version. Version 2 is the latest.
The project-key links the plan to its parent project. The key is specified when creating the project.
Plan key uniquely identifies the plan.

In GitLab CI/CD, a Bamboo Build plan is similar to the .gitlab-ci.yml file in a project, which can include CI/CD scripts from other projects or templates.

The equivalent GitLab CI/CD .gitlab-ci.yml file would be:

default:
  image: alpine:latest

stages:
  - test
  - build

test-application:
  stage: test
  script:
    - # Run tests

security-checks:
  stage: test
  script:
    - # Run Security Checks

build-application:
  stage: build
  script:
    - # Run builds

Container Images

Builds and deployments are run by default on the Bamboo agent's native operating system, but can be configured to run in containers. To make jobs run in a container, Bamboo uses the docker keyword at the plan or job level.

For example, in a Bamboo build plan:

version: 2
plan:
  project-key: SAMPLE
  name: Build Ruby App
  key: BUILD-APP

docker: alpine:latest

stages:
  - Build App:
      jobs:
        - Build Application

Build Application:
  tasks:
    - script:
        - # Run builds
  docker:
    image: alpine:edge

In GitLab CI/CD, you only need the image keyword.

The equivalent GitLab CI/CD .gitlab-ci.yml file would be:

default:
  image: alpine:latest

stages:
  - build

build-application:
  stage: build
  script:
    - # Run builds
  image:
    name: alpine:edge

Variables

Bamboo has the following types of variables based on scope:

Build-specific variables which are evaluated at build time. For example ${bamboo.planKey}.
System variables inherited from the Bamboo instance or system environment.
Global variables defined for the entire instance and accessible to every plan.
Project variables specific to a project and accessible by plans in the same project.
Plan variables specific to a plan.

You can access variables in Bamboo using the format ${system.variableName} for System variables and ${bamboo.variableName} for other types of variables. When using a variable in a script task, the full stops, are converted to underscores, ${bamboo.variableName} becomes $bamboo_variableName.

In GitLab, CI/CD variables can be defined at these levels:

Instance.
Group.
Project.
At the global level in the CI/CD configuration.
At the job level in the CI/CD configuration.

Like Bamboo's System and Global variables, GitLab has predefined CI/CD variables that are available to every job.

Defining variables in CI/CD scripts is similar in both Bamboo and GitLab.

For example, in a Bamboo build plan:

version: 2
# ...
variables:
  username: admin
  releaseType: milestone

Default job:
  tasks:
    - script: echo '$bamboo_username is the DRI for $bamboo_releaseType'

The equivalent GitLab CI/CD .gitlab-ci.yml file would be:

variables:
  GLOBAL_VAR: "A global variable"

job1:
  variables:
    JOB_VAR: "A job variable"
  script:
    - echo "Variables are '$GLOBAL_VAR' and '$JOB_VAR'"

In GitLab CI/CD, variables are accessed like regular Shell script variables. For example, $VARIABLE_NAME.

Jobs & Tasks

In both GitLab and Bamboo, jobs in the same stage run in parallel, except where there is a dependency that needs to be met before a job runs.

The number of jobs that can run in Bamboo depends on availability of Bamboo agents and Bamboo license Size. With GitLab CI/CD, the number of parallel jobs depends on the number of runners integrated with the GitLab instance and the concurrency set in the runners.

In Bamboo, Jobs are composed of Tasks, which can be:

A set of commands run as a script
Predefined tasks like source code checkout, artifact download, and other tasks available in the Atlassian tasks marketplace.

For example, in a Bamboo build plan:

version: 2
#...

Default Job:
  key: JOB1
  tasks:
  - checkout:
      force-clean-build: false
      description: Checkout Default Repository
  - script:
      interpreter: SHELL
      scripts:
      - |-
        ruby -v
        bundle config set --local deployment true
        bundle install -j $(nproc)
      description: run bundler
other:
  concurrent-build-plugin: system-default

The equivalent of Tasks in GitLab is the script, which specifies the commands for the runner to execute.

For example, in a GitLab CI/CD .gitlab-ci.yml file:

job1:
  script: "bundle exec rspec"

job2:
  script:
    - ruby -v
    - bundle config set --local deployment true
    - bundle install -j $(nproc)

With GitLab, you can use CI/CD templates and CI/CD components to compose your pipelines without the need to write everything yourself.

Conditionals

In Bamboo, every task can have conditions that determine if a task runs.

For example, in a Bamboo build plan:

version: 2
# ...
tasks:
  - script:
      interpreter: SHELL
      scripts:
        - echo "Hello"
      conditions:
        - variable:
            equals:
              planRepository.branch: development

With GitLab, this can be done with the rules keyword to control when jobs run in GitLab CI/CD.

For example, in a GitLab CI/CD .gitlab-ci.yml file:

job:
  script: echo "Hello, Rules!"
  rules:
    - if: $CI_MERGE_REQUEST_SOURCE_BRANCH_NAME = development

Triggers

Bamboo has a number of options for triggering builds, which can be based on code changes, a schedule, the outcomes of other plans, or on demand. A plan can be configured to periodically poll a project for new changes, as shown below.

For example, in a Bamboo build plan:

version: 2
#...
triggers:
- polling:
    period: '180'

GitLab CI/CD pipelines can be triggered based on code change, on schedule, or triggered by other jobs or API calls. GitLab CI/CD pipelines do not need to use polling, but can be triggered on schedule as well.

You can configure when pipelines themselves run with the workflow keyword, and rules.

For example, in a GitLab CI/CD .gitlab-ci.yml file:

workflow:
  rules:
    - changes:
        - .gitlab/**/**.md
      when: never

Artifacts

You can define Job artifacts using the artifacts keyword in both GitLab and Bamboo.

For example, in a Bamboo build plan:

version: 2
# ...
  artifacts:
    -
      name: Test Reports
      location: target/reports
      pattern: '*.xml'
      required: false
      shared: false
    -
      name: Special Reports
      location: target/reports
      pattern: 'special/*.xml'
      shared: true

In this example, artifacts are defined with a name, location, pattern, and the optional ability to share the artifacts with other jobs or plans. You canalso define jobs that subscribe to the artifact.

artifact-subscriptions is used to access artifacts from another job in the same plan, for example:

Test app:
  artifact-subscriptions:
    -
      artifact: Test Reports
      destination: deploy

artifact-download is used to access artifacts from jobs in a different plan, for example:

version: 2
# ...
  tasks:
    - artifact-download:
        source-plan: PROJECTKEY-PLANKEY

You need to provide the key of the plan you are downloading artifacts from in the source-plan keyword.

In GitLab, all artifacts from completed jobs in earlier stages are downloaded by default.

For example, in a GitLab CI/CD .gitlab-ci.yml file:

stages:
  - build

pdf:
  stage: build
  script: #generate XML reports
  artifacts:
    name: "test-report-files"
    untracked: true
    paths:
      - target/reports

In this example:

The name of the artifact is specific explicitly, but you can make it dynamic by using a CI/CD variable.
The untracked keyword sets the artifact to also include Git untracked files, along with those specified explictly with paths.

Caching

In Bamboo, Git caches can be used to speed up builds. Git caches are configured in Bamboo administration settings and are stored either on the Bamboo server or remote agents.

GitLab supports both Git Caches and Job cache. Caches are defined per job using the cache keyword.

For example, in a GitLab CI/CD .gitlab-ci.yml file:

test-job:
  stage: build
  cache:
    - key:
        files:
          - Gemfile.lock
      paths:
        - vendor/ruby
    - key:
        files:
          - yarn.lock
      paths:
        - .yarn-cache/
  script:
    - bundle config set --local path 'vendor/ruby'
    - bundle install
    - yarn install --cache-folder .yarn-cache
    - echo Run tests...

Deployment Projects

Bamboo has Deployments project, which link to Build plans to track, fetch, and deploy artifacts to deployment environments.

When creating a project you link it to a build plan, specify the deployment environment and the tasks to perform the deployments. A deployment task can either be a script or a Bamboo task from the Atlassian marketplace.

For example in a Deployment project Spec:

version: 2

deployment:
  name: Deploy ruby app
  source-plan: build-app

release-naming: release-1.0

environments:
  - Production

Production:
  tasks:
    - # scripts to deploy app to production
    - ./.ci/deploy_prod.sh

In GitLab CI/CD, You can create a deployment job that deploys to an environment or creates a release.

For example, in a GitLab CI/CD .gitlab-ci.yml file:

deploy-to-production:
  stage: deploy
  script:
    - # Run Deployment script
    - ./.ci/deploy_prod.sh
  environment:
    name: production

To create release instead, use the release keyword with the release-cli tool to create releases for Git tags.

For example, in a GitLab CI/CD .gitlab-ci.yml file:

release_job:
  stage: release
  image: registry.gitlab.com/gitlab-org/release-cli:latest
  rules:
    - if: $CI_COMMIT_TAG                  # Run this job when a tag is created manually
  script:
    - echo "Building release version"
  release:
    tag_name: $CI_COMMIT_TAG
    name: 'Release $CI_COMMIT_TAG'
    description: 'Release created using the release-cli.'

Security Scanning features

Bamboo relies on third-party tasks provided in the Atlassian Marketplace to run security scans. GitLab provides security scanners out-of-the-box to detect vulnerabilities in all parts of the SDLC. You can add these plugins in GitLab using templates, for example to add SAST scanning to your pipeline, add the following to your .gitlab-ci.yml:

include:
  - template: Jobs/SAST.gitlab-ci.yml

You can customize the behavior of security scanners by using CI/CD variables, for example with the SAST scanners.

Secrets Management

Privileged information, often referred to as "secrets", is sensitive information or credentials you need in your CI/CD workflow. You might use secrets to unlock protected resources or sensitive information in tools, applications, containers, and cloud-native environments.

Secrets management in Bamboo is usually handled using Shared credentials, or via third-party applications from the Atlassian market place.

For secrets management in GitLab, you can use one of the supported integrations for an external service. These services securely store secrets outside of your GitLab project, though you must have a subscription for the service:

GitLab also supports OIDC authentication for other third party services that support OIDC.

Additionally, you can make credentials available to jobs by storing them in CI/CD variables, though secrets stored in plain text are susceptible to accidental exposure, the same as in Bamboo. You should always store sensitive information in masked and protected variables, which mitigates some of the risk.

Also, never store secrets as variables in your .gitlab-ci.yml file, which is public to all users with access to the project. Storing sensitive information in variables should only be done in the project, group, or instance settings.

Review the security guidelines to improve the safety of your CI/CD variables.

Migration Plan

The following list of recommended steps was created after observing organizations that were able to quickly complete this migration.

Create a Migration Plan

Before starting a migration you should create a migration plan to make preparations for the migration. For a migration from Bamboo, ask yourself the following questions in preparation:

What Bamboo Tasks are used by jobs in Bamboo today?
- Do you know what these Tasks do exactly?
- Do any Task wrap a common build tool? For example, Maven, Gradle, or NPM?
What is installed on the Bamboo agents?
Are there any shared libraries in use?
How are you authenticating from Bamboo? Are you using SSH keys, API tokens, or other secrets?
Are there other projects that you need to access from your pipeline?
Are there credentials in Bamboo to access outside services? For example Ansible Tower, Artifactory, or other Cloud Providers or deployment targets?

Prerequisites

Before doing any migration work, you should first:

Get familiar with GitLab.
- Read about the key GitLab CI/CD features.
- Follow tutorials to create your first GitLab pipeline and more complex pipelines that build, test, and deploy a static site.
- Review the CI/CD YAML syntax reference.
Set up and configure GitLab.
Test your GitLab instance.
- Ensure runners are available, either by using shared GitLab.com runners or installing new runners.

Migration Steps

Migrate projects from your SCM solution to GitLab.
- (Recommended) You can use the available importers to automate mass imports from external SCM providers.
- You can import repositories by URL.
Create a .gitlab-ci.yml file in each project.
Export your Bamboo Projects/Plans as YAML Spec
Migrate Bamboo YAML Spec configuration to GitLab CI/CD jobs and configure them to show results directly in merge requests.
Migrate deployment jobs by using cloud deployment templates, environments, and the GitLab agent for Kubernetes.
Check if any CI/CD configuration can be reused across different projects, then create and share CI/CD templates.
Check the pipeline efficiency documentation to learn how to make your GitLab CI/CD pipelines faster and more efficient.

If you have questions that are not answered here, the GitLab community forum can be a great resource.

Migrating from Bamboo

GitLab CI/CD Primer

Key similarities and differences

Offerings

Agents vs Runners

Workflow

Templating & Configuration as Code

Bamboo Specs

.gitlab-ci.yml configuration file

Configuration

Bamboo YAML Spec syntax

Common Configurations

Workflow

Build Plans

Container Images

Variables

Jobs & Tasks

Conditionals

Triggers

Artifacts

Caching

Deployment Projects

Security Scanning features

Secrets Management

Migration Plan

Create a Migration Plan

Prerequisites

Migration Steps

`.gitlab-ci.yml` configuration file