Summary

This page covers information on how to use the new 'Pawsey Bio - Ubuntu 20.04 - 2021-11' image for Nimbus. Instructions on how to choose this image when creating your instance can be found here. This Bio-image is created to cater to bioinformatics users who prefer to have their instances pre-installed with software commonly used in the bioinformatics domain. Some of the software are part of Pawsey's ongoing effort to improve the experience of bioinformatics users at Pawsey.

Commonly used software

Docker

RStudio

A virtual desktop application - see Setting up a virtual desktop for your instance

Instructions

On this page, we will cover instructions for how to use CernVM-FS and Singularity-HPC. For instructions for other software listed above, please see the links provided above, or the software's original documentation page.

CernVM-FS

CernVM-FS is a read-only file system that was developed by another supercomputing centre (Cern). It allows files such as container tools, reference datasets and other shared resources that are commonly used by many researchers to be accessed, added to, and updated in the one location. At Pawsey, we currently cache the Biocontainer tools and reference genome datasets that are on Galaxy Project's repositories. Please note that the data sets may not be comprehensive, and this service is not meant to replace your current methods for accessing public datasets.

If you are using the 'Pawsey Bio - Ubuntu 20.04 - 2021-11' image, run the following to re-install CVMFS:

sudo apt-get autoremove cvmfs
sudo apt-get purge cvmfs
sudo rm -rf /etc/cvmfs/
git clone https://github.com/PawseySC/Pawsey-CernVM-FS.git
cd Pawsey-CernVM-FS
sudo ./install-cvmfs.sh install

Then, to access and view the entire list of Biocontainer tools from the repository: 

Note: It may take a minute or two to load the folders. When you have done it once, it will not take as long to show again.

Summary

This page covers information on how to use the 'Pawsey Bio - Ubuntu 22.04 - 2023-XX' image for Nimbus. Instructions on how to choose this image when creating your instance can be found here. This Bio-image is created to cater to bioinformatics users who prefer to have their instances pre-installed with software, tools and datasets commonly used in the bioinformatics domain, including over 8000 Biocontainer tools.

Commonly used software

Instructions

On this page, we will only cover instructions for how to use access and use Biocontainers and reference genome data sets. For instructions for the software listed above, please see the software's original documentation page.

1. Biocontainers and Reference Genome data

CernVM-FS is a read-only file system that was developed by another supercomputing centre (Cern). It allows files such as container tools, reference datasets and other shared resources that are commonly used by many researchers to be accessed, added to, and updated in the one location. At Pawsey, we currently cache the Biocontainer tools and reference genome datasets that are on Galaxy Project's repositories. The list of Biocontainer tools available can be searched on https://biocontainers.pro/registry. 

To use the Biocontainer tools, you can skip this step and proceed to the next section, 2. Using the Biocontainer tools.

To view these repositories, you can do the following:

1. List the Biocontainer tools repository:

   Note
   Note: It may take a minute or two to load the folders. When you have done it once, it will not take as long to show again.

   
   

   Tip
   The /cvmfs/singularity.galaxyproject.org/all subdirectory is where the entire list of 8000+ Biocontainers can be found, with the alphabetical subdirectories being symlinks to them.

   
   

   Code Block

   $ ls -la /cvmfs/singularity.galaxyproject.org total 140 drwxr-xr-x 33 cvmfs cvmfs 4096 Mar 25 2020 . drwxr-xr-x 3 cvmfs cvmfs 4096 May 12 2022 1 drwxr-xr-x 3 cvmfs cvmfs 4096 Jun 29 2020 2 drwxr-xr-x 4 cvmfs cvmfs 4096 Feb 10 07:09 3 drwxr-xr-x 24 cvmfs cvmfs 4096 Feb 23 2021 a drwxr-xr-x 4 cvmfs cvmfs 4096 Mar 7 19:06 all drwxr-xr-x 23 cvmfs cvmfs 4096 Sep 2 2022 b drwxr-xr-x 26 cvmfs cvmfs 4096 Feb 10 15:05 c drwxr-xr-x 22 cvmfs cvmfs 4096 Feb 10

1. 15:

1. 05

1. d drwxr-xr-x

1. 23 cvmfs cvmfs 4096

1. May

1. 1

1. 2020

1. e drwxr-xr-x

1. 21 cvmfs cvmfs 4096

1. Feb 10

1. 19:06

1. f drwxr-xr-x

1. 25 cvmfs cvmfs 4096

1. Feb

1. 5 2022

1. g drwxr-xr-x

1. 19 cvmfs cvmfs 4096 Feb 10

1. 21:

1. 21

1. h drwxr-xr-x

1. 18 cvmfs cvmfs 4096 Feb 10

1. 21:

1. 21

1. i drwxr-xr-x

1. 14 cvmfs cvmfs 4096

1. Jul 10

1. 2020

1. j drwxr-xr-x 21 cvmfs cvmfs 4096 Feb 25

1. 2021

1. k drwxr-xr-x

1. 16 cvmfs cvmfs 4096 Feb 10

1. 22:54 l drwxr-xr-x

1. 26 cvmfs cvmfs 4096 Feb 10

1. 22:

1. 54

1. m drwxr-xr-x

1. 20 cvmfs cvmfs 4096 Feb

1. 11

1. 05:

1. 13

1. n drwxr-xr-x 14 cvmfs cvmfs 4096

1. May

1. 7 2020

1. o drwxr-xr-x

1. 24 cvmfs cvmfs 4096

1. Aug

1. 24 2021

1. p drwxr-xr-x

1. 12 cvmfs cvmfs 4096 Feb

1. 27 2021 q drwxr-xr-x

1. 27 cvmfs cvmfs 4096 Jun

1. 28

1. 2022

1. r drwxr-xr-x

1. 26 cvmfs cvmfs 4096

1. Apr

1. 7

1. 2020 s drwxr-xr-x

1. 24 cvmfs cvmfs 4096

1. Feb 11

1. 23:17 t

1. drwxr-xr-x

1. 13 cvmfs cvmfs 4096

1. Feb

1. 11

1. 23:17 u drwxr-xr-x

1. 18 cvmfs cvmfs 4096 Feb

1. 11 23:17

1. v

1. drwxr-xr-x

1. 17 cvmfs cvmfs 4096

1. Jul 28

1. 2021

1. w drwxr-xr-x

1. 16 cvmfs cvmfs 4096 Apr 7 2020

1. x drwxr-xr-x

1. 4 cvmfs cvmfs 4096 Feb

1. 28 2021 y drwxr-xr-x

1. 10 cvmfs cvmfs 4096 Feb 11 23:17

1. z

   
   

2. List the reference genome sets and other data files:

   Code Block
   $ ls -la /cvmfs/data.galaxyproject.org/ total 14 drwxr-xr-x

1. 4 cvmfs cvmfs 4096

1. Mar

1. 31

1. 2016

1. . -rw-r--r-- 1 cvmfs cvmfs

1. 21 Oct

1. 24

1. 2018

1. .cvmfsdirtab drwxr-xr-x

1. 210 cvmfs cvmfs 4096

1. Apr

1. 21

1. 2022

1. byhand drwxr-xr-x

1. 18 cvmfs cvmfs 4096 Nov

1. 24

To access the data files:

$ ls -la /cvmfs/data.galaxyproject.org/
total 14
drwxr-xr-x   4 cvmfs cvmfs 4096 Mar 31  2016 .
-rw-r--r--   1 cvmfs cvmfs   21 Oct 24  2018 .cvmfsdirtab
drwxr-xr-x 210 cvmfs cvmfs 4096 Apr 21  2022 byhand
drwxr-xr-x  18 cvmfs cvmfs 4096 Nov 24  2020 managed

To use these data files for your analyses, copy the absolute file path in your workflow/pipeline. For example, with the reference genome Hg38, the file can be found in the following location, and specifically under the seq sub directory:

$ ls -la /cvmfs/data.galaxyproject.org/byhand/hg38
total 46
drwxrwxr-x  10 cvmfs cvmfs 4096 Apr 22  2016 .
drwxr-xr-x 210 cvmfs cvmfs 4096 Apr 21  2022 ..
-rw-r--r--   1 cvmfs cvmfs    0 Apr 22  2016 .cvmfscatalog
drwxrwxr-x   3 cvmfs cvmfs 4096 Jan 21  2015 download
drwxrwxr-x   6 cvmfs cvmfs 4096 Jan 20  2015 hg38canon
drwxrwxr-x   6 cvmfs cvmfs 4096 Jan 20  2015 hg38female
drwxrwxr-x   6 cvmfs cvmfs 4096 Jan 20  2015 hg38full
drwxrwxr-x   2 cvmfs cvmfs 4096 Mar 18  2014 liftOver
drwxrwxr-x   2 cvmfs cvmfs 4096 Mar 18  2014 picard_index
drwxrwxr-x   2 cvmfs cvmfs 4096 Mar 18  2014 sam_index
drwxrwxr-x   2 cvmfs cvmfs 4096 Apr  1  2016 seq


$ ls -la /cvmfs/data.galaxyproject.org/byhand/hg38/seq
total 10108046
drwxrwxr-x  2 cvmfs cvmfs       4096 Apr  1  2016 .
drwxrwxr-x 10 cvmfs cvmfs       4096 Apr 22  2016 ..
-rw-rw-r--  1 cvmfs cvmfs        136 Mar 18  2014 README
-rw-rw-r--  1 cvmfs cvmfs  835393456 Mar 18  2014 hg38.2bit
lrwxrwxrwx  1 cvmfs cvmfs         11 May 17  2014 hg38.fa -> hg38full.fa
-rw-r--r--  1 cvmfs cvmfs      19327 Aug 24  2015 hg38.fa.fai
-rw-rw-r--  1 cvmfs cvmfs 3150052305 Mar 17  2014 hg38canon.fa
-rw-rw-r--  1 cvmfs cvmfs 3091680335 Mar 17  2014 hg38female.fa
-rw-r--r--  1 cvmfs cvmfs        757 Apr  1  2016 hg38female.fa.fai
-rw-rw-r--  1 cvmfs cvmfs 3273481150 Mar 18  2014 hg38full.fa

So the full absolute path for the Hg38 sequence file would be:

/cvmfs/data.galaxyproject.org/byhand/hg38/seq/hg38full.fa

If you run into any errors with accessing the file system, run the following to re-install it:

sudo apt-get autoremove cvmfs
sudo apt-get purge cvmfs
sudo rm -rf /etc/cvmfs/
git clone https://github.com/PawseySC/Pawsey-CernVM-FS.git
cd Pawsey-CernVM-FS
sudo ./install-cvmfs.sh install

Singularity-HPC

Singularity-HPC is a software for container modules. If you are familiar with using containers, this is an added bonus to your experience in using containers. If you are not, this is a great way to start using containers. As container syntax can be messy and confusing, being able to use them as modules removes the need for using container syntaxes. Singularity-HPC was created by one of the original developers of Singularity, and the registry includes many bioinformatics containers that can be readily pulled and used. 

Before you begin, ensure to move your containers folder to your storage volume (.i.e. /data), then update the container base path:

mv /home/ubuntu/containers /data/containers
shpc config set container_base:/data/containers

To see the entire list of containers available on the registry, run the following command:

shpc list 

At Pawsey, we recommend using S-HPC's registry of quay.io/biocontainers containers, as Biocontainers are a reliable source of well-built containers, with versions that are seamlessly matched to BioConda's tools. To narrow down the list to biocontainers, run:

shpc show -f quay.io/biocontainers

To install any of these containers, run:

shpc install quay.io/biocontainers/TOOL_NAME

To use installed containers, run the following and use the tool as you normally would (no container syntax required):

module load quay.io/biocontainers/TOOL_NAME

Notes:

You may want to reclone the repo so that your list is always updated, as such:

1. 2020 managed

   Please note that the data sets may not be comprehensive, and this service is not meant to replace your current methods for accessing public datasets.

2. To use these data files for your analyses, copy the absolute file path in your workflow/pipeline. For example, with the reference genome Hg38, the file can be found in the following location, and specifically under the seq sub directory:

   Code Block

   $ ls -la /cvmfs/data.galaxyproject.org/byhand/hg38 total 46 drwxrwxr-x 10 cvmfs cvmfs 4096 Apr 22 2016 . drwxr-xr-x 210 cvmfs cvmfs 4096 Apr 21 2022 .. -rw-r--r-- 1 cvmfs cvmfs 0 Apr 22 2016 .cvmfscatalog drwxrwxr-x 3 cvmfs cvmfs 4096 Jan 21 2015 download drwxrwxr-x 6 cvmfs cvmfs 4096 Jan 20 2015 hg38canon drwxrwxr-x 6 cvmfs cvmfs 4096 Jan 20 2015 hg38female drwxrwxr-x 6 cvmfs cvmfs 4096 Jan 20 2015 hg38full drwxrwxr-x 2 cvmfs cvmfs 4096 Mar 18 2014 liftOver drwxrwxr-x 2 cvmfs cvmfs 4096 Mar 18 2014 picard_index drwxrwxr-x 2 cvmfs cvmfs 4096 Mar 18 2014 sam_index drwxrwxr-x 2 cvmfs cvmfs 4096 Apr 1 2016 seq $ ls -la /cvmfs/data.galaxyproject.org/byhand/hg38/seq total 10108046 drwxrwxr-x 2 cvmfs cvmfs 4096 Apr 1 2016 . drwxrwxr-x 10 cvmfs cvmfs 4096 Apr 22 2016 .. -rw-rw-r-- 1 cvmfs cvmfs 136 Mar 18 2014 README -rw-rw-r-- 1 cvmfs cvmfs 835393456 Mar 18 2014 hg38.2bit lrwxrwxrwx 1 cvmfs cvmfs 11 May 17 2014 hg38.fa -> hg38full.fa -rw-r--r-- 1 cvmfs cvmfs 19327 Aug 24 2015 hg38.fa.fai -rw-rw-r-- 1 cvmfs cvmfs 3150052305 Mar 17 2014 hg38canon.fa -rw-rw-r-- 1 cvmfs cvmfs 3091680335 Mar 17 2014 hg38female.fa -rw-r--r-- 1 cvmfs cvmfs 757 Apr 1 2016 hg38female.fa.fai -rw-rw-r-- 1 cvmfs cvmfs 3273481150 Mar 18 2014 hg38full.fa

   
   

3. So the full absolute path for the Hg38 sequence file would be:

   Code Block
   /cvmfs/data.galaxyproject.org/byhand/hg38/seq/hg38full.fa

   
   

sudo apt-get autoremove cvmfs
sudo apt-get purge cvmfs
sudo rm -rf /etc/cvmfs/ 
cd /home/ubuntu
git clone https://github.com/PawseySC/Pawsey-CernVM-FS.git
cd Pawsey-CernVM-FS
sudo ./install-cvmfs.sh install

2. Using the Biocontainer tools 

Singularity-HPC (SHPC) is a software for container modules. In this Pawsey Bio - Ubuntu 22.04 - 2023-XX image, we have integrated the use of SHPC seamlessly with CernVM-FS. This means that you can easily access and use over 8000 Biocontainers (and up to the latest versions) without needing to understand container syntax.

export SINGULARITY_BINDPATH=/data
echo 'export SINGULARITY_BINDPATH=/data' >> ~/.bashrc

1.  To search for versions and information on a particular tool, e.g. for cuttlefish, use shpc show:

   Code Block

   $ shpc show quay.io/biocontainers/cuttlefish url: https://biocontainers.pro/tools/cuttlefish maintainer: '@vsoch' description: shpc-registry automated BioContainers addition for cuttlefish latest: 2.2.0--hf1761c0_0: sha256:63cdd7778b144a37684ae53b8e760ed00852f3010aa79292b3f1a6a6470f0992 tags: 2.1.0--hf1761c0_0: sha256:aa009abd48c372125e060d39f49f1690be74b6dac276d451bf1cc4c847a914d6 2.1.1--hf1761c0_0: sha256:8bccced83dd6bbf87843cf08851563c812ef7c36afda2efbcf0d54f9102b913f 2.2.0--hf1761c0_0: sha256:63cdd7778b144a37684ae53b8e760ed00852f3010aa79292b3f1a6a6470f0992 docker: quay.io/biocontainers/cuttlefish aliases: cuttlefish: /usr/local/bin/cuttlefish

   
   

2. To check for availability and to load the tool, use the module avail and module load commands:

   Note
   Note that on first use, the tool might take a 30 seconds or so to run the command as the container is being accessed from the filesystem for the first time

   
   

   Code Block
   $ module avail cuttlefish ------------------------------- /home/ubuntu/singularity-hpc/modules ------------------------------- quay.io/biocontainers/cuttlefish/2.2.0--hf1761c0_0/module

   
   

   Code Block
   $ module load quay.io/biocontainers/cuttlefish/2.2.0--hf1761c0_0/module

   
   

   Code Block
   $ cuttlefish --version cuttlefish 2.2.0 Supported commands: `build`, `help`, `version`. Usage: cuttlefish build [options]

   
   

3. To check for the list of modules loaded:

   Note
   This list will be cleared whenever you log out of your instance. After logging back in, you will need to reload the module for it to be on the list for use.

   
   

   Code Block
   $ module list Currently Loaded Modules: 1) quay.io/biocontainers/cuttlefish/2.2.0--hf1761c0_0/module

   
   

   
   

   
   

4. To install another version not available as a module:

   Expand
   title Expand...
   To use another version of the tool available from the above shpc show list, use shpc to install the module, ensuring to use and keep the cvmfs path of the container: Code Block $ sudo shpc install quay.io/biocontainers/cuttlefish:2.1.1--hf1761c0_0 /cvmfs/singularity.galaxyproject.org/all/cuttlefish:2.1.1--hf1761c0_0 --keep-path Module quay.io/biocontainers/cuttlefish:2.1.1--hf1761c0_0 was created. Update the modules cache, then, run the same module commands to load the tool in this version: Code Block $ /usr/local/lmod/lmod/libexec/update_lmod_system_cache_files -d /opt/mData/cacheDir -t /opt/mData/cacheTS.txt /home/ubuntu/singularity-hpc/modules Code Block $ module avail cuttlefish ------------------------------- /home/ubuntu/singularity-hpc/modules ------------------------------- quay.io/biocontainers/cuttlefish/2.1.1--hf1761c0_0/module quay.io/biocontainers/cuttlefish/2.2.0--hf1761c0_0/module (L,D) Where: L: Module is loaded D: Default Module   Code Block $ module load quay.io/biocontainers/cuttlefish/2.1.1--hf1761c0_0/module The following have been reloaded with a version change: 1) quay.io/biocontainers/cuttlefish/2.2.0--hf1761c0_0/module => quay.io/biocontainers/cuttlefish/2.1.1--hf1761c0_0/module  You will notice that the previous version of the tool is now swapped out for the version you just loaded Code Block $ module list   Currently Loaded Modules: 1) quay.io/biocontainers/cuttlefish/2.1.1--hf1761c0_0/module

   
   

If you prefer to use the biocontainers without SHPC, you can do so by using the absolute path for each of the biocontainers. Note that you would require knowledge on how to use Singularity to do so. The version of Singularity installed on the Nimbus Bio image is 3.8.7 and instructions can be found here: Singularity exec.

For example, to use cuttlefish version 2.2.0–hf1761c0_0:

$ ls /cvmfs/singularity.galaxyproject.org/all/cuttlefish:2.2.0*
/cvmfs/singularity.galaxyproject.org/all/cuttlefish:2.2.0--h6a68c12_1
/cvmfs/singularity.galaxyproject.org/all/cuttlefish:2.2.0--h6a68c12_2
/cvmfs/singularity.galaxyproject.org/all/cuttlefish:2.2.0--hf1761c0_0
/cvmfs/singularity.galaxyproject.org/all/cuttlefish:2.2.0--hf1761c0_1

$ singularity exec /cvmfs/singularity.galaxyproject.org/all/cuttlefish:2.2.0--hf1761c0_0 cuttlefish

cuttlefish 2.2.0
Supported commands: `build`, `help`, `version`.
Usage:
	cuttlefish build [options]

3. Adding a local SHPC registry

If there are versions (usually older ones) of a Biocontainer tool that is present in the cvmfs repository but not on the shpc show list (i.e. the default recipe), you can create a local SHPC registry and add/update a recipe file for the Biocontainer tool.

1. Clone the remote SHPC-registry and add it as a local registry:

   Code Block
   $ cd /home/ubuntu

   
   

   Code Block
   $ git clone https://github.com/singularityhub/shpc-registry.git

   
   

   Code Block
   $ sudo shpc config add registry /home/ubuntu/shpc-registry/ Warning: Check with shpc config edit - ordering of list can change. Added registry to /home/ubuntu/shpc-registry/

   
   

2. Look up for available versions of the tool, e.g. cuttlefish:

   Code Block

   $ ls /cvmfs/singularity.galaxyproject.org/all/cuttlefish* /cvmfs/singularity.galaxyproject.org/all/cuttlefish:1.0.0--h2e03b76_0 /cvmfs/singularity.galaxyproject.org/all/cuttlefish:1.0.0--h2e03b76_1 /cvmfs/singularity.galaxyproject.org/all/cuttlefish:2.0.0--h95f258a_0 /cvmfs/singularity.galaxyproject.org/all/cuttlefish:2.0.0--hf1761c0_1 /cvmfs/singularity.galaxyproject.org/all/cuttlefish:2.1.0--hf1761c0_0 /cvmfs/singularity.galaxyproject.org/all/cuttlefish:2.1.1--hf1761c0_0 /cvmfs/singularity.galaxyproject.org/all/cuttlefish:2.2.0--hf1761c0_0

   
   

3. To add a different version to the recipe file for the tool, e.g. 2.0.0--hf1761c0_1:

   Code Block

   $ shpc add /cvmfs/singularity.galaxyproject.org/all/cuttlefish:2.0.0--hf1761c0_1 quay.io/biocontainers/cuttlefish:2.0.0--hf1761c0_1 --registry /home/ubuntu/shpc-registry/ quay.io/biocontainers/cuttlefish:2.0.0--hf1761c0_1 already exists and will be updated! Registry entry quay.io/biocontainers/cuttlefish was added! Before shpc install, edit: /home/ubuntu/shpc-registry/quay.io/biocontainers/cuttlefish/container.yaml

   
   

4. To install the tool:

   Warning

   If you are using the now deprecated 'Pawsey Bio - Ubuntu 20.04 - 2021-11' image, run the following steps first: Code Block cd /home/ubuntu git clone https://github.com/singularityhub/singularity-hpc.git mkdir /home/ubuntu/singularity-hpc/modules sudo shpc config set module_base /home/ubuntu/singularity-hpc/modules cat >> ~/.bashrc <<'EOF' module use /home/ubuntu/singularity-hpc/modules EOF source ~/.bashrc By setting your module_base to this new location, all new container modules will be installed to this path.

   
   

   Code Block
   $ sudo shpc install quay.io/biocontainers/cuttlefish:2.0.0--hf1761c0_1 /cvmfs/singularity.galaxyproject.org/all/cuttlefish:2.0.0--hf1761c0_1 --keep-path Module biocontainers/cuttlefish:2.0.0--hf1761c0_1 was created.

   
   

5. Now when you do a module avail, the newly installed 2.0.0--hf1761c0_1 version will be available:

   Code Block
   $ module avail cuttlefish   ------------------------------- /home/ubuntu/singularity-hpc/modules ------------------------------- quay.io/biocontainers/cuttlefish/2.0.0--hf1761c0_1/module

   
   

6. Since you have created your own local registry, shpc will default to your local registry whenever you do a look up with shpc show. To look up the full list of Biocontainer tools with the latest versions, you will need to add a flag to point to the remote (Github) shpc-registry in your search:

   Tip
   The shpc-registry is kept up-to-date with the latest versions of all Biocontainers on a nightly update.

   
   

   Code Block
   $ shpc show quay.io/biocontainers/cuttlefish --registry https://github.com/singularityhub/shpc-registry

   
   

4. Using Nextflow

Nextflow makes use of containers to run your workflows sequentially. Each step of your workflow is called a process. For each process, Nextflow pulls the appropriate container required for that step to run it. You can prevent Nextflow from pulling the container and using what is present on your instance to save time and space.

To do so, you would create an additional config file to point Nextflow to either 1) the paths of the containers on /cvmfs/singularity.galaxyproject.org, or 2) the module paths on your instance. Nextflow prioritises this custom config file above the default nextflow.config file(s), if present, in other directories for your workflow.

Nextflow pipelines for Bioinformatics

Nextflow has a repository of pipelines that are available through https://nf-co.re. These are becoming increasingly popular, as more peer-reviewed pipelines are added by the community. A couple of popular ones include:

• https://nf-co.re/rnaseq/3.10.1
• https://nf-co.re/sarek

Configuring Nextflow to use Biocontainers

Please note this is only an example of how you can configure your Nextflow workflow to use the containers available from your instance.

1. Suppose you are using the nfcore/rnaseq pipeline. Note that in the main.nf for the FASTQC process, there are a few parameters for the tool. These will be over-written by the config file that you will create in the next step.

   Code Block

   $ cat rnaseq/modules/nf-core/fastqc/main.nf process FASTQC { tag "$meta.id" label 'process_medium' conda "bioconda::fastqc=0.11.9" container "${ workflow.containerEngine == 'singularity' && !task.ext.singularity_pull_docker_container ? 'https://depot.galaxyproject.org/singularity/fastqc:0.11.9--0' : 'quay.io/biocontainers/fastqc:0.11.9--0' }" input: tuple val(meta), path(reads) output: tuple val(meta), path("*.html"), emit: html tuple val(meta), path("*.zip") , emit: zip path "versions.yml" , emit: versions when: task.ext.when == null || task.ext.when script: def args = task.ext.args ?: '' def prefix = task.ext.prefix ?: "${meta.id}" // Make list of old name and new name pairs to use for renaming in the bash while loop def old_new_pairs = reads instanceof Path || reads.size() == 1 ? [[ reads, "${prefix}.${reads.extension}" ]] : reads.withIndex().collect { entry, index -> [ entry, "${prefix}_${index + 1}.${entry.extension}" ] } def rename_to = old_new_pairs*.join(' ').join(' ') def renamed_files = old_new_pairs.collect{ old_name, new_name -> new_name }.join(' ') """ printf "%s %s\\n" $rename_to | while read old_name new_name; do [ -f "\${new_name}" ] || ln -s \$old_name \$new_name done fastqc $args --threads $task.cpus $renamed_files cat <<-END_VERSIONS > versions.yml "${task.process}": fastqc: \$( fastqc --version | sed -e "s/FastQC v//g" ) END_VERSIONS """ stub: def prefix = task.ext.prefix ?: "${meta.id}" """ touch ${prefix}.html touch ${prefix}.zip cat <<-END_VERSIONS > versions.yml "${task.process}": fastqc: \$( fastqc --version | sed -e "s/FastQC v//g" ) END_VERSIONS """ }

   
   

2. Nextflow prioritises a custom config file over any other config files or values defined in the workflow files. To ensure that Nextflow uses the existing container for fastqc, you would create and use a custom config file, choosing either of the two ways:

   Ui tabs
   Ui tab title CVMFS path Create a cvmfs_path.config file with the following: Then run the workflow with this config: Ui tab title Modules path Create a modules_path.config file with the following: Then run the workflow with this config:

   
   

   For the other processes in your workflow, you will need to also add to the corresponding *_path.config file to ensure that every process has the path for the existing container to run that part of the workflow from. More info on config files for processes can be found here: https://www.nextflow.io/docs/latest/config.html#scope-process