Running docker "hello-world" image using singularity

One of the advantage of singularity is, it does not require any service to run containers. And the images that you downloaded will be saved in normal files in your filesystem, rather than in some cache directory like docker.

To run dockerhub's hello-world image using singularity:

1. Pull the image from dockerhub

$ singularity pull docker://hello-world

2. The image will be saved as hello-world_latest.sif

$ ls 

hello-world_latest.sif

3.1 To run a container based on that image, just use "singularity run" against the sif file

$ singularity run  hello-world_latest.sif

...

Hello from Docker!      

This message shows that your installation appears to be working correctly.

...

3.2 Or you can just "./" the sif file

$ ./hello-world_latest.sif

...

Hello from Docker!      

This message shows that your installation appears to be working correctly.

...