Merge branch 'docs/refactor-pipeline-schedules' into 'master'

Refactor pipeline schedules docs

See merge request !11470

doc/ci/README.md

@@ -66,7 +66,8 @@ learn how to leverage its potential even more.
   submodules are involved
 - [Auto deploy](autodeploy/index.md)
 - [Use SSH keys in your build environment](ssh_keys/README.md)
-- [Trigger jobs through the GitLab API](triggers/README.md)
+- [Trigger pipelines through the GitLab API](triggers/README.md)
+- [Trigger pipelines on a schedule](../user/project/pipelines/schedules.md)
 
 ## Review Apps
 

doc/ci/triggers/README.md

-# Triggering jobs through the API
+# Triggering pipelines through the API
 
-> **Note**:
+> **Notes**:
 - [Introduced][ci-229] in GitLab CE 7.14.
 - GitLab 8.12 has a completely redesigned job permissions system. Read all
   about the [new model and its implications](../../user/project/new_ci_build_permissions_model.md#job-triggers).
@@ -208,7 +208,7 @@ curl --request POST \
   https://gitlab.example.com/api/v4/projects/9/trigger/pipeline
 ```
 
-### Using webhook to trigger job
+### Using a webhook to trigger a pipeline
 
 You can add the following webhook to another project in order to trigger a job:
 
@@ -216,4 +216,18 @@ You can add the following webhook to another project in order to trigger a job:
 https://gitlab.example.com/api/v4/projects/9/ref/master/trigger/pipeline?token=TOKEN&variables[UPLOAD_TO_S3]=true
 ```
 
+### Using cron to trigger nightly pipelines
+
+>**Note:**
+The following behavior can also be achieved through GitLab's UI with
+[pipeline schedules](../../user/project/pipelines/schedules.md).
+
+Whether you craft a script or just run cURL directly, you can trigger jobs
+in conjunction with cron. The example below triggers a job on the `master`
+branch of project with ID `9` every night at `00:30`:
+
+```bash
+30 0 * * * curl --request POST --form token=TOKEN --form ref=master https://gitlab.example.com/api/v4/projects/9/trigger/pipeline
+```
+
 [ci-229]: https://gitlab.com/gitlab-org/gitlab-ci/merge_requests/229

doc/ci/pipeline_schedules.md → doc/user/project/pipelines/schedules.md

 # Pipeline Schedules
 
-> **Note**:
-- This feature was introduced in 9.1 as [Trigger Schedule][ce-105533]
-- In 9.2, the feature was [renamed to Pipeline Schedule][ce-10853]
+> **Notes**:
+- This feature was introduced in 9.1 as [Trigger Schedule][ce-10533].
+- In 9.2, the feature was [renamed to Pipeline Schedule][ce-10853].
+- Cron notation is parsed by [Rufus-Scheduler](https://github.com/jmettraux/rufus-scheduler).
 
 Pipeline schedules can be used to run pipelines only once, or for example every
 month on the 22nd for a certain branch.
 
-## Using Pipeline Schedules
+## Using Pipeline schedules
+
+In order to schedule a pipeline:
 
-In order to schedule pipelines, navigate to your their pages **Pipelines ➔ Schedules**
-and click the **New Schedule** button.
+1. Navigate to your project's **Pipelines ➔ Schedules** and click the
+   **New Schedule** button.
+1. Fill in the form
+1. Hit **Save pipeline schedule** for the changes to take effect.
 
 ![New Schedule Form](img/pipeline_schedules_new_form.png)
 
-After entering the form, hit **Save Schedule** for the changes to have effect.
-You can check a next execution date of the scheduled trigger, which is automatically calculated by a server.
+>**Attention:**
+The pipelines won't be executed precisely, because schedules are handled by
+Sidekiq, which runs according to its interval.
+See [advanced admin configuration](#advanced-admin-configuration) for more
+information.
 
-## Taking ownership
+In the **Schedules** index page you can see a list of the pipelines that are
+scheduled to run. The next run is automatically calculated by the server GitLab
+is installed on.
 
 ![Schedules list](img/pipeline_schedules_list.png)
 
-Pipelines are executed as a user, which owns a schedule. This influences what
+## Taking ownership
+
+Pipelines are executed as a user, who owns a schedule. This influences what
 projects and other resources the pipeline has access to. If a user does not own
 a pipeline, you can take ownership by clicking the **Take ownership** button.
 The next time a pipeline is scheduled, your credentials will be used.
 
-> **Notes**:
-- Those pipelines won't be executed precicely. Because schedules are handled by
-Sidekiq, which runs according to its interval. For exmaple, if you set a schedule to
-create a pipeline every minute (`* * * * *`) and the Sidekiq worker performs 00:00
-and 12:00 o'clock every day (`0 */12 * * *`), only 2 pipelines will be created per day.
-To change the Sidekiq worker's frequency, you have to edit the `trigger_schedule_worker_cron`
-value in your `gitlab.rb` and restart GitLab. The Sidekiq worker's configuration
-on GiLab.com is able to be looked up at [here](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/config/gitlab.yml.example#L185).
-- Cron notation is parsed by [Rufus-Scheduler](https://github.com/jmettraux/rufus-scheduler).
-- When the owner of the schedule does not have the ability to create pipelines
-anymore, due to e.g. being blocked or removed from the project, the schedule is
-deactivated. Another user can take ownership and activate it, so the schedule is
-run again.
+![Schedules list](img/pipeline_schedules_ownership.png)
+
+>**Note:**
+When the owner of the schedule doesn't have the ability to create pipelines
+anymore, due to e.g., being blocked or removed from the project, the schedule
+is deactivated. Another user can take ownership and activate it, so the
+schedule can be run again.
+
+## Advanced admin configuration
+
+The pipelines won't be executed precisely, because schedules are handled by
+Sidekiq, which runs according to its interval. For example, if you set a
+schedule to create a pipeline every minute (`* * * * *`) and the Sidekiq worker
+runs on 00:00 and 12:00 every day (`0 */12 * * *`), only 2 pipelines will be
+created per day. To change the Sidekiq worker's frequency, you have to edit the
+`trigger_schedule_worker_cron` value in your `gitlab.rb` and restart GitLab.
+For GitLab.com, you can check the [dedicated settings page][settings]. If you
+don't have admin access to the server, ask your administrator.
 
 [ce-10533]: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/10533
 [ce-10853]: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/10853
+[settings]: https://about.gitlab.com/gitlab-com/settings/#cron-jobs