| `CI_PIPELINE_ID` | 8.10 | all | The unique id of the current pipeline that GitLab CI uses internally |
| `CI_PIPELINE_IID` | 11.0 | all | The unique id of the current pipeline scoped to project |
| `CI_PIPELINE_SOURCE` | 10.0 | all | Indicates how the pipeline was triggered. Possible options are: `push`, `web`, `trigger`, `schedule`, `api`, and `pipeline`. For pipelines created before GitLab 9.5, this will show as `unknown` |
| `CI_PIPELINE_TRIGGERED` | all | all | The flag to indicate that job was [triggered] |
| `CI_PIPELINE_TRIGGERED` | all | all | The flag to indicate that job was [triggered](../triggers/README.md) |
| `CI_PROJECT_DIR` | all | all | The full path where the repository is cloned and where the job is run. If the GitLab Runner `builds_dir` parameter is set, this variable is set relative to the value of `builds_dir`. For more information, see [Advanced configuration](https://docs.gitlab.com/runner/configuration/advanced-configuration.html#the-runners-section) for GitLab Runner. |
| `CI_PROJECT_ID` | all | all | The unique id of the current project that GitLab CI uses internally |
If you want to use HTTPS, see [Using HTTPS](#using-https) for the additional steps.
NOTE: **Note:**
Make sure your hostname can be resolved on the machine itself by either a proper DNS record or an additional line in `/etc/hosts` ("127.0.0.1 hostname"). This might be necessary, for example, if you set up GitLab behind a reverse proxy. If the hostname cannot be resolved, the final installation check will fail with "Check GitLab API access: FAILED. code: 401" and pushing commits will be rejected with "[remote rejected] master -> master (hook declined)".
Make sure your hostname can be resolved on the machine itself by either a proper DNS record or an additional line in `/etc/hosts` ("127.0.0.1 hostname"). This might be necessary, for example, if you set up GitLab behind a reverse proxy. If the hostname cannot be resolved, the final installation check will fail with `Check GitLab API access: FAILED. code: 401` and pushing commits will be rejected with `[remote rejected] master -> master (hook declined)`.
NOTE: **Note:**
GitLab Shell application startup time can be greatly reduced by disabling RubyGems. This can be done in several ways: