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--- research:containers [2019/02/22 14:43]
itshililo created
+++ research:containers [2021/12/09 16:42] (current)
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-====== Singularity in a Nutshell ======
+======Singularity in a Nutshell======
-Singularity is a container solution created for scientific and application workloads. The objective of this guide is to demonstrate how to use Singularity on the CHPC  Lengau cluster.
+Moved to [[howto:singularity|Singularity in a Nutshell]].
-The diagram below is a visual depiction of the Singularity work-flow process. This process can be categorised into two environments:
-  * **Build** environment: for testing and building containers (user needs sudo privileges). This would ideally be the user's workstation or VM.
-  * **Production** environment where users run containers. E.g (Lengau Cluster)
-For more details please read the user manual: [[https://www.sylabs.io/guides/2.6/user-guide/index.html]]
-{{ :research:flow.png?900 |}}
-Based on the image above, it is clear that the CHPC Lengau cluster will only provide a production (container execution) environment for the Singularity workflow. Therefore, users are only allowed to run already built containers images on this platform.
-**NB:** Please note that the computes nodes on Lengau do not have access to the internet, which means that users will not be able to use the Singularity **pull** command. However, users can use the **scp.chpc.ac.ca** node to facilitate the transfer of images to and from the platform.
-==== Using Singularity on Lengau Cluster ====
-Using Singularity on Lengau can be summarised as a two-stage process:
-  - **Transferring images to the Lengau cluster:** Users can use cp, SCP, rsync or FTP to copy their images on the cluster using the node://** scp.chpc.ac.za**//. Alternatively, login to the //**scp.chpc.ac.za node**//, load the module chpc/singularity and the use the **Singularity pull** command to get the images from the respective repository.

wiki.chpc.ac.za

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