Configuring CircleCI

Reference > Configuring CircleCI

This document is a reference for the CircleCI 2.0 configuration keys that are used in the config.yml file. The presence of a .circleci/config.yml file in your CircleCI-authorized repository branch indicates that you want to use the 2.0 infrastructure.

You can see a complete config.yml in our full example.

Note: If you already have a CircleCI 1.0 configuration, the config.yml file allows you to test 2.0 builds on a separate branch, leaving any existing configuration in the old circle.yml style unaffected and running on the CircleCI 1.0 infrastructure in branches that do not contain .circleci/config.yml.

Table of Contents

• version
• jobs
  • <job_name>
    • environment
    • parallelism
    • docker / machine / macos(executor)
    • branches
    • resource_class
    • steps
      • run
      • Default shell options
      • Background commands
      • Shorthand syntax
      • The when Attribute
      • Example
      • checkout
      • setup_remote_docker
      • save_cache
        • Example
      • restore_cache
        • Example
      • deploy
        • Example
      • store_artifacts
        • Example
      • store_test_results
        • Example
      • persist_to_workspace
      • Example for root Key
        • Example for paths Key
      • attach_workspace
        • Example
      • add_ssh_keys
• workflows
  • version
  • <workflow_name>
    • triggers
      • schedule
        • cron
        • filters
    • jobs
      • <job_name>
        • requires
        • context
        • type
        • filters
        • Example

version

The version field is intended to be used in order to issue warnings for deprecation or breaking changes.

jobs

A run is comprised of one or more named jobs. Jobs are specified in the jobs map, see Sample 2.0 config.yml for two examples of a job map. The name of the job is the key in the map, and the value is a map describing the job.

If you are using Workflows, jobs must have a name that is unique within the .circleci/config.yml file.

If you are not using workflows, the jobs map must contain a job named build. This build job is the default entry-point for a run that is triggered by a push to your VCS provider. It is possible to then specify additional jobs and run them using the CircleCI API.

<job_name>

Each job consists of the job’s name as a key and a map as a value. A name should be unique within a current jobs list. The value map has the following attributes:

⁽¹⁾ exactly one of them should be specified. It is an error to set more than one.

environment

A map of environment variable names and variables (Note: These will override any environment variables you set in the CircleCI web interface).

parallelism

If parallelism is set to N > 1, then N independent executors will be set up and each will run the steps of that job in parallel. Certain parallelism-aware steps can opt out of the parallelism and only run on a single executor (for example deploy step). Learn more about parallel jobs.

working_directory will be created automatically if it doesn’t exist.

Example:

jobs:
  build:
    docker:
      - image: buildpack-deps:trusty
    environment:
      - FOO: "bar"
    parallelism: 3
    resource_class: large
    working_directory: ~/my-app
    branches:
      only:
        - master
        - /rc-.*/
    steps:
      - run: make test
      - run: make

docker / machine / macos(executor)

An “executor” is roughly “a place where steps occur”. CircleCI 2.0 can build the necessary environment by launching as many docker containers as needed at once, or it can use a full virtual machine. Learn more about different executors.

docker

Configured by docker key which takes a list of maps:

The first image listed in the file defines the primary container image where all steps will run.

entrypoint overrides default entrypoint from Dockerfile.

command will be used as arguments to image entrypoint (if specified in Dockerfile) or as executable (if no entrypoint is provided here or in the Dockerfile).

For primary container (listed first in the list) if no command is specified then command and image entrypoint will be ignored, to avoid errors caused by the entrypoint executable consuming significant resources or exiting prematurely. At this time all steps run in the primary container only.

name defines the name for reaching the secondary service containers. By default, all services are exposed directly on localhost. The field is appropriate if you would rather have a different host name instead of localhost, for example, if you are starting multiple versions of the same service.

The environment settings apply to all commands run in this executor, not just the initial command. The environment here has higher precedence over setting it in the job map above.

You can specify image versions using tags or digest. You can use any public images from any public Docker registry (defaults to Docker Hub). Learn more about specifying images.

Example:

jobs:
  build:
    docker:
      - image: buildpack-deps:trusty # primary container
        environment:
          ENV: CI

      - image: mongo:2.6.8
        command: [--smallfiles]

      - image: postgres:9.4.1
        environment:
          POSTGRES_USER: root

      - image: redis@sha256:54057dd7e125ca41afe526a877e8bd35ec2cdd33b9217e022ed37bdcf7d09673

If you are using a private image, you can specify the username and password in the auth field. To protect the password, you can set it as a project setting which you reference here:

jobs:
  build:
    docker:
      - image: acme-private/private-image:321
        auth:
          username: mydockerhub-user  # can specify string literal values
          password: $DOCKERHUB_PASSWORD  # or project UI env-var reference

Using an image hosted on AWS ECR requires authentication using AWS credentials. By default, CircleCI uses the AWS credentials that you add to the Project > Settings > AWS Permissions page in the CircleCI application or by setting the AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY project environment variables. It is also possible to set the credentials by using aws_auth field as in the following example:

jobs:
  build:
    docker:
      - image: account-id.dkr.ecr.us-east-1.amazonaws.com/org/repo:0.1
        aws_auth:
          aws_access_key_id: AKIAQWERVA  # can specify string literal values
          aws_secret_access_key: $ECR_AWS_SECRET_ACCESS_KEY  # or project UI envar reference

machine

The machine executor is configured by using the machine key, which takes a map:

As a shorthand, you can set the machine key to true.

Example:

jobs:
  build:
    machine:
      enabled: true

# or just

jobs:
  build:
    machine: true

CircleCI supports multiple machine images that can be specified in the image field:

• circleci/classic:latest (default) - an Ubuntu version 14.04 image that includes Docker version 17.03.0-ce and docker-compose version 1.9.0, along with common language tools found in CircleCI 1.0 build image. The latest channel provides the latest tested images, changes to the channel are announced at least a week in advance.
• circleci/classic:edge - an Ubuntu version 14.04 image with Docker version 17.06.0-ce and docker-compose version 1.14.0, along with common language tools found in CircleCI 1.0 build image. The edge channel provides release candidates that will eventually be promoted to classic:latest.
• circleci/classic:201703-01 – docker 17.03.0-ce, docker-compose 1.9.0
• circleci/classic:201707-01 – docker 17.06.0-ce, docker-comopse 1.14.0
• circleci/classic:201708-01 – docker 17.06.1-ce, docker-compose 1.14.0
• circleci/classic:201709-01 – docker 17.07.0-ce, docker-compose 1.14.0
• circleci/classic:201710-01 – docker 17.09.0-ce, docker-compose 1.14.0
• circleci/classic:201710-02 – docker 17.10.0-ce, docker-compose 1.16.1
• circleci/classic:201711-01 – docker 17.11.0-ce, docker-compose 1.17.1

You can use one of the year-month versioned images to pin the version used by your jobs. Please subscribe to our Announcements to be notified when new images are released.

Example: use an Ubuntu version 14.04 image with Docker 17.06.1-ce and docker-compose 1.14.0:

version: 2
jobs:
  build:
    machine:
      image: circleci/classic:201708-01

The machine executor supports Docker Layer Caching which is useful when you are building Docker images during your job or Workflow.

Example

version: 2
jobs:
  build:
    machine:
      docker_layer_caching: true    # default - false

macos

CircleCI supports running jobs on macOS, to allow you to build, test, and deploy apps for macOS, iOS, tvOS and watchOS. To run a job in a macOS virtual machine, you must add the macos key to the top-level configuration for the job and specify the version of Xcode you would like to use.

Example: Use a macOS virtual machine with Xcode version 9.0:

jobs:
  build:
    macos:
      xcode: "9.0"

branches

Defines rules for whitelisting/blacklisting execution of some branches if Workflows are not configured. If you are using Workflows, job-level branches will be ignored and must be configured in the Workflows section of your config.yml file. See the workflows section for details. The job-level branch key takes a map:

Both only and ignore lists can have full names and regular expressions. Regular expressions must match the entire string. For example:

jobs:
  build:
    branches:
      only:
        - master
        - /rc-.*/

In this case, only “master” branch and branches matching regex “rc-.*” will be executed.

jobs:
  build:
    branches:
      ignore:
        - develop
        - /feature-.*/

In this example, all the branches will be executed except “develop” and branches matching regex “feature-.*”.

If both ignore and only are present in config, only ignore will be taken into account.

A job that was not executed due to configured rules will show up in the list of jobs in UI, but will be marked as skipped.

resource_class

Note: You must open a support ticket to have a CircleCI Sales representative contact you about enabling this feature on your account for an additional fee.

After this feature is added to your paid plan, it is possible to configure CPU and RAM resources for each job as described in the following table. If resource_class is not specified or an invalid class is specified, the default resource_class: medium will be used. The resource_class key is currently only available for use with the docker executor.

Java, Erlang and any other languages that introspect the /proc directory for information about CPU count may require additional configuration to prevent them from slowing down when using the CircleCI 2.0 resource class feature. Programs with this issue may request 32 CPU cores and run slower than they would when requesting one core. Users of languages with this issue should pin their CPU count to their guaranteed CPU resources.

steps

The steps setting in a job should be a list of single key/value pairs, the key of which indicates the step type. The value may be either a configuration map or a string (depending on what that type of step requires). For example, using a map:

jobs:
  build:
    working_directory: ~/canary-python
    environment:
      - FOO: "bar"
    steps:
      - run:
          name: Running tests
          command: make test

Here run is a step type. The name attribute is used by the UI for display purposes. The command attribute is specific for run step and defines command to execute.

Some steps may implement a shorthand semantic. For example, run may be also be called like this:

jobs:
  build:
    steps:
      - run: make test

In its short form, the run step allows us to directly specify which command to execute as a string value. In this case step itself provides default suitable values for other attributes (name here will have the same value as command, for example).

Another shorthand, which is possible for some steps, is to simply use the step name as a string instead of a key/value pair:

jobs:
  build:
    steps:
      - checkout

In this case, the checkout step will checkout project source code into the job’s working_directory.

In general all steps can be describe as:

Each built-in step is described in detail below.

run

Used for invoking all command-line programs, taking either a map of configuration values, or, when called in its short-form, a string that will be used as both the command and name. Run commands are executed using non-login shells by default, so you must explicitly source any dotfiles as part of the command.

Each run declaration represents a new shell. It’s possible to specify a multi-line command, each line of which will be run in the same shell:

- run:
    command: |
      echo Running test
      mkdir -p /tmp/test-results
      make test

Default shell options

The default value of shell option is /bin/bash -eo pipefail if /bin/bash is present in the build container. Otherwise it is /bin/sh -eo pipefail. The default shell is not a login shell (--login or -l are not specified by default). Hence, the default shell will not source your ~/.bash_profile, ~/.bash_login, ~/.profile files. Descriptions of the -eo pipefail options are provided below.

-e

Exit immediately if a pipeline (which may consist of a single simple command), a subshell command enclosed in parentheses, or one of the commands executed as part of a command list enclosed by braces exits with a non-zero status.

So if in the previous example mkdir failed to create a directory and returned a non-zero status, then command execution would be terminated, and the whole step would be marked as failed. If you desire the opposite behaviour, you need to add set +e in your command or override the default shell in your configuration map of run. For example:

- run:
    command: |
      echo Running test
      set +e
      mkdir -p /tmp/test-results
      make test

- run:
    shell: /bin/sh
    command: |
      echo Running test
      mkdir -p /tmp/test-results
      make test

-o pipefail

If pipefail is enabled, the pipeline’s return status is the value of the last (rightmost) command to exit with a non-zero status, or zero if all commands exit successfully. The shell waits for all commands in the pipeline to terminate before returning a value.

For example:

- run: make test | tee test-output.log

If make test fails, the -o pipefail option will cause the whole step to fail. Without -o pipefail, the step will always run successfully because the result of the whole pipeline is determined by the last command (tee test-output.log), which will always return a zero status.

Note that even if make test fails the rest of pipeline will be executed.

If you want to avoid this behaviour, you can specify set +o pipefail in the command or override the whole shell (see example above).

In general, we recommend using the default options (-eo pipefail) because they show errors in intermediate commands and simplify debugging job failures. For convenience, the UI displays the used shell and all active options for each run step.

For more information, see the Using Shell Scripts document.

Background commands

The background attribute enables you to configure commands to run in the background. Job execution will immediately proceed to the next step rather than waiting for return of a command with the background attribute set to true. The following example shows the config for running the X virtual framebuffer in the background which is commonly required to run Selenium tests:

- run:
    name: Running X virtual framebuffer
    command: Xvfb :99 -screen 0 1280x1024x24
    background: true

- run: make test

Shorthand syntax

run has a very convenient shorthand syntax:

- run: make test

# shorthanded command can also have multiple lines
- run: |
    mkdir -p /tmp/test-results
    make test

In this case, command and name become the string value of run, and the rest of the config map for that run have their default values.

The when Attribute

By default, CircleCI will execute job steps one at a time, in the order that they are defined in config.yml, until a step fails (returns a non-zero exit code). After a command fails, no further job steps will be executed.

Adding the when attribute to a job step allows you to override this default behaviour, and selectively run or skip steps depending on the status of the job.

The default value of on_success means that the step will run only if all of the previous steps have been successful (returned exit code 0).

A value of always means that the step will run regardless of the exit status of previous steps. This is useful if you have a task that you want to run regardless of whether the previous steps are successful or not. For example, you might have a job step that needs to upload logs or code-coverage data somewhere.

A value of on_fail means that the step will run only if one of the preceding steps has failed (returns a non-zero exit code). It is common to use on_fail if you want to store some diagnostic data to help debug test failures, or to run custom notifications about the failure, such as sending emails or triggering alerts in chatrooms.

Example

- run:
    name: Testing application
    command: make test
    shell: /bin/bash
    working_directory: ~/my-app
    no_output_timeout: 30m
    environment:
      FOO: "bar"

- run: echo 127.0.0.1 devhost | sudo tee -a /etc/hosts

- run: |
    sudo -u root createuser -h localhost --superuser ubuntu &&
    sudo createdb -h localhost test_db

- run:
    name: Upload Failed Tests
    command: curl --data fail_tests.log http://example.com/error_logs
    when: on_fail

checkout

Special step used to check out source code to the configured path (defaults to the working_directory). The reason this is a special step is because it is more of a helper function designed to make checking out code easy for you. If you require doing git over HTTPS you should not use this step as it configures git to checkout over ssh.

If path already exists and is:

• a git repo - step will not clone whole repo, instead will pull origin
• NOT a git repo - step will fail.

In the case of checkout, the step type is just a string with no additional attributes:

- checkout

Note: CircleCI does not check out submodules. If your project requires submodules, add run steps with appropriate commands as shown in the following example:

- checkout
- run: git submodule sync
- run: git submodule update --init

setup_remote_docker

Creates a remote Docker environment configured to execute Docker commands. See Running Docker Commands for details.

Notes:

• A paid account is required to access Docker Layer Caching. Customers on paid plans can request access by opening a support ticket. Please include a link to the project on CircleCI) with your request.
• setup_remote_docker is not compatible with the machine executor. See Docker Layer Caching in Machine Executor for information on how to enable DLC with the machine executor.

save_cache

Generates and stores a cache of a file or directory of files such as dependencies or source code in our object storage. Later jobs can restore this cache. Learn more in the caching documentation.

The cache for a specific key is immutable and cannot be changed once written. NOTE: If the cache for the given key already exists it won’t be modified, and job execution will proceed to the next step.

When storing a new cache, the key value may contain special templated values for your convenience:

During step execution, the templates above will be replaced by runtime values and use the resultant string as the key.

Template examples:

• myapp-{{ checksum "package.json" }} - cache will be regenerated every time something is changed in package.json file, different branches of this project will generate the same cache key.
• myapp-{{ .Branch }}-{{ checksum "package.json" }} - same as the previous one, but each branch will generate separate cache
• myapp-{{ epoch }} - every run of a job will generate a separate cache

While choosing suitable templates for your cache key, keep in mind that cache saving is not a free operation, because it will take some time to upload the cache to our storage. So it make sense to have a key that generates a new cache only if something actually changed and avoid generating a new one every run of a job.

Example

- save_cache:
    key: v1-myapp-{{ arch }}-{{ checksum "project.clj" }}
    paths:
      - /home/ubuntu/.m2

restore_cache

Restores a previously saved cache based on a key. Cache needs to have been saved first for this key using save_cache step. Learn more in the caching documentation.

⁽¹⁾ at least one attribute has to be present. If key and keys are both given, key will be checked first, and then keys.

A key is searched against existing keys as a prefix.

NOTE: When there are multiple matches, the most recent match will be used, even if there is a more precise match.

For example:

steps:
  - save_cache:
      key: v1-myapp-cache
      paths:
        - ~/d1

  - save_cache:
      key: v1-myapp-cache-new
      paths:
        - ~/d2

  - run: rm -f ~/d1 ~/d2

  - restore_cache:
      key: v1-myapp-cache

In this case cache v1-myapp-cache-new will be restored because it’s the most recent match with v1-myapp-cache prefix even if the first key (v1-myapp-cache) has exact match.

For more information on key formatting, see the key section of save_cache step.

When CircleCI encounters a list of keys, the cache will be restored from the first one matching an existing cache. Most probably you would want to have a more specific key to be first (for example, cache for exact version of package.json file) and more generic keys after (for example, any cache for this project). If no key has a cache that exists, the step will be skipped with a warning.

A path is not required here because the cache will be restored to the location from which it was originally saved.

Example

- restore_cache:
    keys:
      - v1-myapp-{{ arch }}-{{ checksum "project.clj" }}
      # if cache for exact version of `project.clj` is not present then load any most recent one
      - v1-myapp-

# ... Steps building and testing your application ...

# cache will be saved only once for each version of `project.clj`
- save_cache:
    key: v1-myapp-{{ arch }}-{{ checksum "project.clj" }}
    paths:
      - /foo

deploy

Special step for deploying artifacts.

deploy uses the same configuration map and semantics as run step. Jobs may have more than one deploy step.

In general deploy step behaves just like run with one exception - in a job with parallelism, the deploy step will only be executed by node #0 and only if all nodes succeed. Nodes other than #0 will skip this step.

Example

- deploy:
    command: |
      if [ "${CIRCLE_BRANCH}" == "master" ]; then
        ansible-playbook site.yml
      fi

store_artifacts

Step to store artifacts (for example logs, binaries, etc) to be available in the web app or through the API. See the Uploading Artifacts document for more information.

There can be multiple store_artifacts steps in a job. Using a unique prefix for each step prevents them from overwriting files.

Example

- store_artifacts:
    path: /code/test-results
    destination: prefix

store_test_results

Special step used to upload test results so they display in builds’ Test Summary section and can be used for timing analysis. To also see test result as build artifacts, please use the store_artifacts step.

Note: Please write your tests to subdirectories of your store_test_results path, ideally named to match the names of your particular test suites, in order for CircleCI to correctly infer the names your reports. If you do not write your reports to subdirectories, you will see reports in your Test Summary section such as Your build ran 71 tests in unknown, instead of, for example, Your build ran 71 tests in rspec.

Example

Directory structure:

test-results
├── jest
│   └── results.xml
├── mocha
│   └── results.xml
└── rspec
    └── results.xml

config.yml syntax:

- store_test_results:
    path: test-results

persist_to_workspace

Special step used to persist a temporary file to be used by another job in the workflow.

The root key is a directory on the container which is taken to be the root directory of the workspace. The paths values are all relative to the root.

Example for root Key

For example, the following step syntax persists the specified paths from /tmp/dir into the workspace, relative to the directory /tmp/dir.

persist_to_workspace:
  root: /tmp/dir
  paths:
    - foo/bar
    - baz

After this step completes, the following directories are added to the workspace:

foo/bar
baz

Example for paths Key

- persist_to_workspace:
    root: /tmp/workspace
    paths:
      - target/application.jar
      - build/*

The paths list uses Glob from Go, and the pattern matches filepath.Match.

pattern: 
        { term } 
term: 
        '*' matches any sequence of non-Separator characters 
        '?' matches any single non-Separator character 
        '[' [ '^' ] { character-range } 
        ']' character class (must be non-empty) 
        c matches character c (c != '*', '?', '\\', '[') 
        '\\' c matches character c 
character-range: 
        c matches character c (c != '\\', '-', ']') 
        '\\' c matches character c 
        lo '-' hi matches character c for lo <= c <= hi 

The Go documenation states that the pattern may describe hierarchical names such as /usr/*/bin/ed (assuming the Separator is ‘/’). Note: Everything must be relative to the work space root directory.

attach_workspace

Special step used to attach the workflow’s workspace to the current container. The full contents of the workspace are downloaded and copied into the directory the workspace is being attached at.

Example

- attach_workspace:
    at: /tmp/workspace

Each workflow has a temporary workspace associated with it. The workspace can be used to pass along unique data built during a job to other jobs in the same workflow. Jobs can add files into the workspace using the persist_to_workspace step and download the workspace content into their fileystem using the attach_workspace step. The workspace is additive only, jobs may add files to the workspace but cannot delete files from the workspace. Each job can only see content added to the workspace by the jobs that are upstream of it.

When attaching a workspace the “layer” from each upstream job is applied in the order the upstream jobs appear in the workflow graph. When two jobs run concurrently the order in which their layers are applied is undefined. If multiple concurrent jobs persist the same filename then attaching the workspace will error.

If a workflow is re-run it inherits the same workspace as the original workflow. When re-running failed jobs only the re-run jobs will see the same workspace content as the jobs in the original workflow.

Note the following distinctions between Artifacts, Workspaces, and Caches:

Refer to the Persisting Data in Workflows: When to Use Caching, Artifacts, and Workspaces for additional conceptual information about using workspaces, caching, and artifacts.

add_ssh_keys

Special step that adds SSH keys configured in the project’s UI to the container, and configure ssh to use them.

- add_ssh_keys:
    fingerprints:
      - "b7:35:a6:4e:9b:0d:6d:d4:78:1e:9a:97:2a:66:6b:be"

Note that CircleCI 2.0 jobs are auto configured with ssh-agent with all keys auto-loaded, and is sufficient for most cases. add_ssh_keys may be needed to have greater control over which SSH keys to authenticate (e.g. avoid “Too many authentication failures” problem when having too many SSH keys).

workflows

Used for orchestrating all jobs. Each workflow consists of the workflow name as a key and a map as a value. A name should be unique within the current config.yml. The top-level keys for the Workflows configuration are version and jobs.

version

The Workflows version field is used to issue warnings for deprecation or breaking changes during Beta.

<workflow_name>

A unique name for your workflow.

triggers

Specifies which triggers will cause this workflow to be executed. Default behavior is to trigger the workflow when pushing to a branch.

schedule

A workflow may have a schedule indicating it runs at a certain time, for example a nightly build that runs every day at 12am UTC:

workflows:
   version: 2
   nightly:
     triggers:
       - schedule:
           cron: "0 0 * * *"
           filters:
             branches:
               only:
                 - master
                 - beta
     jobs:
       - test

cron

The cron key is defined using POSIX crontab syntax.

filters

Filters can have the key branches.

branches

The branches key controls whether the current branch should have a schedule trigger created for it, where current branch is the branch containing the config.yml file with the trigger stanza. That is, a push on the master branch will only schedule a workflow for the master branch.

Branches can have the keys only and ignore which either map to a single string naming a branch. You may also use regular expressions to match against branches by enclosing them with ‘/s’, or map to a list of such strings. Regular expressions must match the entire string.

• Any branches that match only will run the job.
• Any branches that match ignore will not run the job.
• If neither only nor ignore are specified then all branches will run the job.
• If both only and ignore are specified the only is considered before ignore.

jobs

A job can have the keys requires, filters, and context.

<job_name>

A job name that exists in your config.yml.

requires

Jobs are run in parallel by default, so you must explicitly require any dependencies by their job name.

context

Jobs may be configured to use global environment variables set for an organization, see the Contexts document for adding a context in the application settings.

type

A job may have a type of approval indicating it must be manually approved before downstream jobs may proceed. Jobs run in the dependency order until the workflow processes a job with the type: approval key followed by a job on which it depends, for example:

      - hold:
          type: approval
          requires:
            - test1
            - test2
      - deploy:
          requires:
            - hold

Note: The hold job name must not exist in the main configuration.

filters

Filters can have the key branches or tags. Note Workflows will ignore job-level branching. If you use job-level branching and later add workflows, you must remove the branching at the job level and instead declare it in the workflows section of your config.yml, as follows:

branches

Branches can have the keys only and ignore which either map to a single string naming a branch. You may also use regular expressions to match against branches by enclosing them with ‘/s’, or map to a list of such strings. Regular expressions must match the entire string.

• Any branches that match only will run the job.
• Any branches that match ignore will not run the job.
• If neither only nor ignore are specified then all branches will run the job.
• If both only and ignore are specified the only is considered before ignore.

tags

CircleCI treats tag and branch filters differently when deciding whether a job should run.

1. For a branch push unaffected by any filters, CircleCI runs the job.
2. For a tag push unaffected by any filters, CircleCI skips the job.

Item two above means that a job must have a filters tags section to run as a part of a tag push and all its transitively dependent jobs must also have a filters tags section. Refer to the Git Tag Job Execution section of the Orchestrating Workflows document for more examples.

Tags can have the keys only and ignore keys. You may also use regular expressions to match against tags by enclosing them with ‘/s’, or map to a list of such strings. Regular expressions must match the entire string.

• Any tags that match only will run the job.
• Any tags that match ignore will not run the job.
• If neither only nor ignore are specified then the job is skipped for all tags.
• If both only and ignore are specified the only is considered before ignore.

Example

workflows:
  version: 2

  build_test_deploy:
    jobs:
      - flow
      - downstream:
          requires:
            - flow
          filters:
            branches:
              only: master

Refer to the Orchestrating Workflows document for more examples and conceptual information.

Full Example

version: 2
jobs:
  build:
    docker:
      - image: ubuntu:14.04

      - image: mongo:2.6.8
        command: [mongod, --smallfiles]

      - image: postgres:9.4.1
        # some containers require setting environment variables
        environment:
          POSTGRES_USER: root

      - image: redis@sha256:54057dd7e125ca41afe526a877e8bd35ec2cdd33b9217e022ed37bdcf7d09673

      - image: rabbitmq:3.5.4

    environment:
      TEST_REPORTS: /tmp/test-reports

    working_directory: ~/my-project

    branches:
      ignore:
        - develop
        - /feature-.*/

    steps:
      - checkout

      - run:
          command: echo 127.0.0.1 devhost | sudo tee -a /etc/hosts

      # Create Postgres users and database
      # Note the YAML heredoc '|' for nicer formatting
      - run: |
          sudo -u root createuser -h localhost --superuser ubuntu &&
          sudo createdb -h localhost test_db

      - restore_cache:
          keys:
            - v1-my-project-{{ checksum "project.clj" }}
            - v1-my-project-

      - run:
          environment:
            SSH_TARGET: "localhost"
            TEST_ENV: "linux"
          command: |
            set -xu
            mkdir -p ${TEST_REPORTS}
            run-tests.sh
            cp out/tests/*.xml ${TEST_REPORTS}

      - run: |
          set -xu
          mkdir -p /tmp/artifacts
          create_jars.sh ${CIRCLE_BUILD_NUM}
          cp *.jar /tmp/artifacts

      - save_cache:
          key: v1-my-project-{{ checksum "project.clj" }}
          paths:
            - ~/.m2

      # Save artifacts
      - store_artifacts:
          path: /tmp/artifacts
          destination: build

      # Upload test results
      - store_test_results:
          path: /tmp/test-reports
          
  deploy-stage:
    docker:
      - image: ubuntu:14.04
    working_directory: /tmp/my-project  
    steps:
      - run:
          name: Deploy if tests pass and branch is Staging
          command: ansible-playbook site.yml -i staging          
          
  deploy-prod:
    docker:
      - image: ubuntu:14.04
    working_directory: /tmp/my-project  
    steps:
      - run:
          name: Deploy if tests pass and branch is Master
          command: ansible-playbook site.yml -i production

workflows:
  version: 2
  build-deploy:
    jobs:
      - build
      - deploy-stage:
          requires:
            - build
          filters:
            branches:
              only: staging
      - deploy-prod:
          requires:
            - build
          filters:
            branches:
              only: master