The Nextflow [`-c`](https://www.nextflow.io/docs/latest/config.html) parameter can be used with nf-core pipelines in order to load custom config files that you have available locally. However, if you or other people within your organization are likely to be running nf-core pipelines regularly it may be a good idea to use/create a custom config file that defines some generic settings unique to the computing environment within your organization.
The config files hosted in this repository define a set of parameters which are specific to compute environments at different Institutions but generic enough to be used with all nf-core pipelines.
All nf-core pipelines inherit the functionality provided by Nextflow, and as such custom config files can contain parameters/definitions that are available to both. For example, if you have the ability to use [Singularity](https://singularity.lbl.gov/) on your HPC you can add and customize the Nextflow [`singularity`](https://www.nextflow.io/docs/latest/config.html#scope-singularity) scope in your config file. Similarly, you can define a Nextflow [`executor`](https://www.nextflow.io/docs/latest/executor.html) depending on the job submission process available on your cluster. In contrast, the `params` section in your custom config file will typically define parameters that are specific to nf-core pipelines.
You should be able to get a good idea as to how other people are customizing the execution of their nf-core pipelines by looking at some of the config files in [`nf-core/configs`](https://github.com/nf-core/configs/tree/master/conf).
If you want to use an existing config available in `nf-core/configs`, and you're running on a system that has no internet connection, you'll need to download the config file and place it in a location that is visible to the file system on which you are running the pipeline. Then run the pipeline with `--custom_config_base`
or `params.custom_config_base` set to the location of the directory containing the repository files:
If you decide to upload your custom config file to `nf-core/configs` then this will ensure that your custom config file will be automatically downloaded, and available at run-time to all nf-core pipelines, and to everyone within your organisation. You will simply have to specify `-profile <config_name>` in the command used to run the pipeline. See [`nf-core/configs`](https://github.com/nf-core/configs/tree/master/conf) for examples.
Please also make sure to add an extra `params` section with `params.config_profile_description`, `params.config_profile_contact` and `params.config_profile_url` set to reasonable values. Users will get information on who wrote the configuration profile then when executing a nf-core pipeline and can report back if there are things missing for example.
## Checking user hostnames
If your cluster has a set of consistent hostnames, nf-core pipelines can check that users are using your profile.
Add one or more hostname substrings to `params.hostnames` under a key that matches the profile name.
If the user's hostname contains this string at the start of a run or when a run fails and their profile
does not contain the profile name, a warning message will be printed.
If you want to add a new custom config file to `nf-core/configs` please test that your pipeline of choice runs as expected by using the [`-c`](https://www.nextflow.io/docs/latest/config.html) parameter.
You will have to create a [Markdown document](https://www.markdownguide.org/getting-started/) outlining the details required to use the custom config file within your organisation. You might orientate yourself using the [Template](docs/template.md) that we provide and filling out the information for your cluster there.
[Fork](https://help.github.com/articles/fork-a-repo/) the `nf-core/configs` repository to your own GitHub account. Within the local clone of your fork add the custom config file to the [`conf/`](https://github.com/nf-core/configs/tree/master/conf) directory, and the documentation file to the [`docs/`](https://github.com/nf-core/configs/tree/master/docs) directory. You will also need to edit and add your custom profile to the [`nfcore_custom.config`](https://github.com/nf-core/configs/blob/master/nfcore_custom.config) file in the top-level directory of the clone.
Commit and push these changes to your local clone on GitHub, and then [create a pull request](https://help.github.com/articles/creating-a-pull-request-from-a-fork/) on the `nf-core/configs` GitHub repo with the appropriate information.
We will be notified automatically when you have created your pull request, and providing that everything adheres to nf-core guidelines we will endeavour to approve your pull request as soon as possible.
