- Configuring environments
Working with environments
- Viewing environments and deployments
- Viewing deployment history
- Retrying and rolling back
- Using the environment URL
- Stopping an environment
- Grouping similar environments
- Monitoring environments
- Web terminals
- Check out deployments locally
- Scoping environments with specs
- Further reading
Introduced in GitLab 8.9.
Environments allow control of the continuous deployment of your software, all within GitLab.
There are many stages required in the software development process before the software is ready for public consumption.
- Develop your code.
- Test your code.
- Deploy your code into a testing or staging environment before you release it to the public.
This helps find bugs in your software, and also in the deployment process as well.
GitLab CI/CD is capable of not only testing or building your projects, but also deploying them in your infrastructure, with the added benefit of giving you a way to track your deployments. In other words, you will always know what is currently being deployed or has been deployed on your servers.
It’s important to know that:
- Environments are like tags for your CI jobs, describing where code gets deployed.
- Deployments are created when jobs deploy versions of code to environments, so every environment can have one or more deployments.
- Provides a full history of your deployments for each environment.
- Keeps track of your deployments, so you always know what is currently being deployed on your servers.
If you have a deployment service such as Kubernetes associated with your project, you can use it to assist with your deployments, and can even access a web terminal for your environment from within GitLab!
Configuring environments involves:
The rest of this section illustrates how to configure environments and deployments using an example scenario. It assumes you have already:
In the scenario:
- We are developing an application.
- We want to run tests and build our app on all branches.
- Our default branch is
- We deploy the app only when a pipeline on
masterbranch is run.
Let’s consider the following
stages: - test - build - deploy test: stage: test script: echo "Running tests" build: stage: build script: echo "Building the app" deploy_staging: stage: deploy script: - echo "Deploy to staging server" environment: name: staging url: https://staging.example.com only: - master
We have defined 3 stages:
The jobs assigned to these stages will run in this order. If any job fails, then the pipeline fails and jobs that are assigned to the next stage won’t run.
In our case:
testjob will run first.
- Then the
- Lastly the
With this configuration, we:
- Check that the tests pass.
- Ensure that our app is able to be built successfully.
- Lastly we deploy to the staging server.
environmentkeyword is just a hint for GitLab that this job actually deploys to the
nameenvironment. It can also have a
urlthat is exposed in various places within GitLab. Each time a job that has an environment specified succeeds, a deployment is recorded, storing the Git SHA and environment name.
In summary, with the above
.gitlab-ci.yml we have achieved the following:
- All branches will run the
deploy_stagingjob will run only on the
masterbranch, which means all merge requests that are created from branches don’t get deployed to the staging server.
- When a merge request is merged, all jobs will run and the
deploy_stagingjob will deploy our code to a staging server while the deployment will be recorded in an environment named
Starting with GitLab 8.15, the environment name is exposed to the Runner in two forms:
$CI_ENVIRONMENT_SLUG. The first is the name given in
.gitlab-ci.yml(with any variables expanded), while the second is a “cleaned-up” version of the name, suitable for use in URLs, DNS, etc.
Starting with GitLab 9.3, the environment URL is exposed to the Runner via
$CI_ENVIRONMENT_URL. The URL is expanded from
.gitlab-ci.yml, or if the URL was not defined there, the external URL from the environment is used.
when: manual to an automatically executed job’s configuration converts it to
a job requiring manual action.
To expand on the previous example, the following includes
another job that deploys our app to a production server and is
tracked by a
.gitlab-ci.yml file for this is as follows:
stages: - test - build - deploy test: stage: test script: echo "Running tests" build: stage: build script: echo "Building the app" deploy_staging: stage: deploy script: - echo "Deploy to staging server" environment: name: staging url: https://staging.example.com only: - master deploy_prod: stage: deploy script: - echo "Deploy to production server" environment: name: production url: https://example.com when: manual only: - master
when: manual action:
- Exposes a “play” button in GitLab’s UI for that job.
- Means the
deploy_prodjob will only be triggered when the “play” button is clicked.
You can find the “play” button in the pipelines, environments, deployments, and jobs views.
Clicking on the play button in any view will trigger the
deploy_prod job, and the
deployment will be recorded as a new environment named
production(all lowercase), it will get recorded in Cycle Analytics.
Regular environments are good when deploying to “stable” environments like staging or production.
However, for environments for branches other than
master, dynamic environments
can be used. Dynamic environments make it possible to create environments on the fly by
declaring their names dynamically in
Dynamic environments are a fundamental part of Review apps.
url parameters for dynamic environments can use most available CI/CD variables,
However, you cannot use variables defined:
- On the Runner’s side.
There are also other variables that are unsupported in the context of
For more information, see Where variables can be used.
GitLab Runner exposes various environment variables when a job runs, so you can use them as environment names.
In the following example, the job will deploy to all branches except
deploy_review: stage: deploy script: - echo "Deploy a review app" environment: name: review/$CI_COMMIT_REF_NAME url: https://$CI_ENVIRONMENT_SLUG.example.com only: - branches except: - master
In this example:
- The job’s name is
deploy_reviewand it runs on the
- We set the
review/$CI_COMMIT_REF_NAME. Since the environment name can contain slashes (
/), we can use this pattern to distinguish between dynamic and regular environments.
- We tell the job to run
For the value of:
environment:name, the first part is
review, followed by a
$CI_COMMIT_REF_NAME, which receives the value of the branch name.
environment:url, we want a specific and distinct URL for each branch.
$CI_COMMIT_REF_NAMEmay contain a
/or other characters that would be invalid in a domain name or URL, so we use
$CI_ENVIRONMENT_SLUGto get a “clean” or “safe” URL.
For example, given a
100-Do-The-Thing, the URL will be something like
https://100-do-the-4f99a2.example.com. Again, the way you set up the web server to serve these requests is based on your setup.
We have used
$CI_ENVIRONMENT_SLUGhere because it is guaranteed to be unique. If you’re using a workflow like GitLab Flow, collisions are unlikely and you may prefer environment names to be more closely based on the branch name. In that case, you could use
environment:urlin the example above:
https://$CI_COMMIT_REF_SLUG.example.com, which would give a URL of
/) in the dynamic environments’ names. However, using this format will enable the grouping similar environments feature.
The configuration in this section provides a full development workflow where your app is:
- Deployed as a Review App.
- Deployed to a staging server once the merge request is merged.
- Finally, able to be manually deployed to the production server.
The following combines the previous configuration examples, including:
- Defining simple environments for testing, building, and deployment to staging.
- Adding manual actions for deployment to production.
- Creating dynamic environments for deployments for reviewing.
stages: - test - build - deploy test: stage: test script: echo "Running tests" build: stage: build script: echo "Building the app" deploy_review: stage: deploy script: - echo "Deploy a review app" environment: name: review/$CI_COMMIT_REF_NAME url: https://$CI_ENVIRONMENT_SLUG.example.com only: - branches except: - master deploy_staging: stage: deploy script: - echo "Deploy to staging server" environment: name: staging url: https://staging.example.com only: - master deploy_prod: stage: deploy script: - echo "Deploy to production server" environment: name: production url: https://example.com when: manual only: - master
A more realistic example would also include copying files to a location where a webserver (for example, NGINX) could then acess and serve them.
The example below will copy the
public directory to
review_app: stage: deploy script: - rsync -av --delete public /srv/nginx/$CI_COMMIT_REF_SLUG environment: name: review/$CI_COMMIT_REF_NAME url: https://$CI_COMMIT_REF_SLUG.example.com
This example requires that NGINX and GitLab Runner are set up on the server this job will run on.
The complete example provides the following workflow to developers:
- Create a branch locally.
- Make changes and commit them.
- Push the branch to GitLab.
- Create a merge request.
Behind the scenes, GitLab Runner will:
- Pick up the changes and start running the jobs.
- Run the jobs sequentially as defined in
- First, run the tests.
- If the tests succeed, build the app.
- If the build succeeds, the app is deployed to an environment with a name specific to the branch.
So now, every branch:
- Gets its own environment.
- Is deployed to its own unique location, with the added benefit of:
For more information, see Using the environment URL.
Environments can be “protected”, restricting access to them.
For more information, see Protected environments.
Once environments are configured, GitLab provides many features for working with them, as documented below.
A list of environments and deployment statuses is available on each project’s Operations > Environments page.
This example shows:
- The environment’s name with a link to its deployments.
- The last deployment ID number and who performed it.
- The job ID of the last deployment with its respective job name.
- The commit information of the last deployment, such as who committed it, to what branch, and the Git SHA of the commit.
- The exact time the last deployment was performed.
- A button that takes you to the URL that you defined under the
- A button that re-deploys the latest deployment, meaning it runs the job defined by the environment name for that specific commit.
The information shown in the Environments page is limited to the latest deployments, but an environment can have multiple deployments.
- While you can create environments manually in the web interface, we recommend that you define your environments in
.gitlab-ci.ymlfirst. They will be automatically created for you after the first deploy.
- The environments page can only be viewed by users with Reporter permission and above. For more information on permissions, see the permissions documentation.
- Only deploys that happen after your
.gitlab-ci.ymlis properly configured will show up in the Environment and Last deployment lists.
GitLab keeps track of your deployments, so you:
- Always know what is currently being deployed on your servers.
- Can have the full history of your deployments for every environment.
Clicking on an environment shows the history of its deployments. Here’s an example Environments page with multiple deployments:
This view is similar to the Environments page, but all deployments are shown. Also in this view is a Rollback button. For more information, see Retrying and rolling back.
If there is a problem with a deployment, you can retry it or roll it back.
To retry or rollback a deployment:
- Navigate to Operations > Environments.
- Click on the environment.
- In the deployment history list for the environment, click the:
- Retry button next to the last deployment, to retry that deployment.
- Rollback button next to a previously successful deployment, to roll back to that deployment.
scriptdetermines whether the rollback succeeds or not.
The environment URL is exposed in a few places within GitLab:
- In a merge request widget as a link:
- In the Environments view as a button:
- In the Deployments view as a button:
You can see this information in a merge request itself if:
- The merge request is eventually merged to the default branch (usually
- That branch also deploys to an environment (for example,
With GitLab’s Route Maps you can go directly from source files to public pages in the environment set for Review Apps.
Stopping an environment:
- Moves it from the list of Available environments to the list of Stopped environments on the Environments page.
- Executes an
on_stopaction, if defined.
This is often used when multiple developers are working on a project at the same time, each of them pushing to their own branches, causing many dynamic environments to be created.
Environments can be stopped automatically using special configuration.
Consider the following example where the
deploy_review job calls
to clean up and stop the environment:
deploy_review: stage: deploy script: - echo "Deploy a review app" environment: name: review/$CI_COMMIT_REF_NAME url: https://$CI_ENVIRONMENT_SLUG.example.com on_stop: stop_review only: - branches except: - master stop_review: stage: deploy variables: GIT_STRATEGY: none script: - echo "Remove review app" when: manual environment: name: review/$CI_COMMIT_REF_NAME action: stop
When you have an environment that has a stop action defined (typically when
the environment describes a Review App), GitLab will automatically trigger a
stop action when the associated branch is deleted. The
stop_review job must
be in the same
stage as the
deploy_review job in order for the environment
to automatically stop.
You can read more in the
Introduced in GitLab 8.14.
As documented in Configuring dynamic environments, you can
prepend environment name with a word, followed by a
/, and finally the branch
name, which is automatically defined by the
In short, environments that are named like
type/foo are all presented under the same
In our minimal example, we named the environments
$CI_COMMIT_REF_NAME is the branch name. Here is a snippet of the example:
deploy_review: stage: deploy script: - echo "Deploy a review app" environment: name: review/$CI_COMMIT_REF_NAME
In this case, if you visit the Environments page and the branches exist, you should see something like:
If you have enabled Prometheus for monitoring system and response metrics, you can monitor the behavior of your app running in each environment.
Once configured, GitLab will attempt to retrieve supported performance metrics for any environment that has had a successful deployment. If monitoring data was successfully retrieved, a Monitoring button will appear for each environment.
Clicking on the Monitoring button will display a new page showing up to the last 8 hours of performance data. It may take a minute or two for data to appear after initial deployment.
All deployments to an environment are shown directly on the monitoring dashboard, which allows easy correlation between any changes in performance and new versions of the app, all without leaving GitLab.
Web terminals were added in GitLab 8.15 and are only available to project Maintainers and Owners.
If you deploy to your environments with the help of a deployment service (for example, the Kubernetes integration), GitLab can open a terminal session to your environment.
This is a powerful feature that allows you to debug issues without leaving the comfort of your web browser. To enable it, just follow the instructions given in the service integration documentation.
Once enabled, your environments will gain a “terminal” button:
You can also access the terminal button from the page for a specific environment:
Wherever you find it, clicking the button will take you to a separate page to establish the terminal session:
This works just like any other terminal. You’ll be in the container created by your deployment so you can:
- Run shell commands and get responses in real time.
- Check the logs.
- Try out configuration or code tweaks etc.
You can open multiple terminals to the same environment, they each get their own shell
session and even a multiplexer like
Since GitLab 8.13, a reference in the Git repository is saved for each deployment, so
knowing the state of your current environments is only a
git fetch away.
In your Git configuration, append the
[remote "<your-remote>"] block with an extra
fetch = +refs/environments/*:refs/remotes/origin/environments/*
Some GitLab Enterprise Edition features can behave differently for each environment. For example, you can create a secret variable to be injected only into a production environment.
In most cases, these features use the environment specs mechanism, which offers an efficient way to implement scoping within each environment group.
Let’s say there are four environments:
Each environment can be matched with the following environment spec:
As you can see, you can use specific matching for selecting a particular environment,
and also use wildcard matching (
*) for selecting a particular environment group,
such as Review apps (
review/feature-1spec takes precedence over
environment: name, you are limited to only the predefined environment variables.
Re-using variables defined inside
script as part of the environment name will not work.
Below are some links you may find interesting: