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Title: Bootstrap Images (Deprecated) | Singularity

Description: Bootstrap Images (Deprecated) These docs are for Singularity Version 2.5.2. For older versions, see our archive Note: The bootstrap command is deprecated for Singularity Version 2.4. You should use build instead.Bootstrapping was the original way (for Singularity versions prior to 2.4) to install an operating system and then configure it appropriately for a specified need. Bootstrap is very similar to build, except that it by default uses an ext3 filesystem and allows for writability. The images unfortunately are not immutable in this way, and can degrade over time. As of 2.4, bootstrap is still supported for Singularity, however we encourage you to use build instead.Quick StartA bootstrap is done based on a Singularity recipe file (a text file called Singularity) that describes how to specifically build the container. Here we will overview the sections, best practices, and a quick example.$ singularity bootstrapUSAGE: singularity [...] bootstrap The is the path to the Singularity image file, and the is the location of the definition file (the recipe) we will use to create this container. The process of building a container should always be done by root so that the correct file ownership and permissions are maintained. Also, so installation programs check to ensure they are the root user before proceeding. The bootstrap process may take anywhere from one minute to one hour depending on what needs to be done and how fast your network connection is.Let’s continue with our quick start example. Here is your spec file, Singularity,Bootstrap:dockerFrom:ubuntu:latestYou next create an image:$ singularity image.create ubuntu.imgInitializing Singularity image subsystemOpening image file: ubuntu.imgCreating 768MiB imageBinding image to loopCreating file system within imageImage is done: ubuntu.imgand finally run the bootstrap command, pointing to your image () and the file Singularity ().$ sudo singularity bootstrap ubuntu.img Singularity Sanitizing environmentBuilding from bootstrap definition recipeAdding base Singularity environment to containerDocker image path: index.docker.io/library/ubuntu:latestCache folder set to /root/.singularity/docker[5/5] |===================================| 100.0% Exploding layer: sha256:b6f892c0043b37bd1834a4a1b7d68fe6421c6acbc7e7e63a4527e1d379f92c1b.tar.gzExploding layer: sha256:55010f332b047687e081a9639fac04918552c144bc2da4edb3422ce8efcc1fb1.tar.gzExploding layer: sha256:2955fb827c947b782af190a759805d229cfebc75978dba2d01b4a59e6a333845.tar.gzExploding layer: sha256:3deef3fcbd3072b45771bd0d192d4e5ff2b7310b99ea92bce062e01097953505.tar.gzExploding layer: sha256:cf9722e506aada1109f5c00a9ba542a81c9e109606c01c81f5991b1f93de7b66.tar.gzExploding layer: sha256:fe44851d529f465f9aa107b32351c8a0a722fc0619a2a7c22b058084fac068a4.tar.gzFinalizing Singularity containerNotice that bootstrap does require sudo. If you do an import, with a docker uri for example, you would see a similar flow, but the calling user would be you, and the cache your $HOME.$ singularity image.create ubuntu.imgsingularity import ubuntu.img docker://ubuntu:latestDocker image path: index.docker.io/library/ubuntu:latestCache folder set to /home/vanessa/.singularity/dockerImporting: base Singularity environmentImporting: /home/vanessa/.singularity/docker/sha256:b6f892c0043b37bd1834a4a1b7d68fe6421c6acbc7e7e63a4527e1d379f92c1b.tar.gzImporting: /home/vanessa/.singularity/docker/sha256:55010f332b047687e081a9639fac04918552c144bc2da4edb3422ce8efcc1fb1.tar.gzImporting: /home/vanessa/.singularity/docker/sha256:2955fb827c947b782af190a759805d229cfebc75978dba2d01b4a59e6a333845.tar.gzImporting: /home/vanessa/.singularity/docker/sha256:3deef3fcbd3072b45771bd0d192d4e5ff2b7310b99ea92bce062e01097953505.tar.gzImporting: /home/vanessa/.singularity/docker/sha256:cf9722e506aada1109f5c00a9ba542a81c9e109606c01c81f5991b1f93de7b66.tar.gzImporting: /home/vanessa/.singularity/metadata/sha256:fe44851d529f465f9aa107b32351c8a0a722fc0619a2a7c22b058084fac068a4.tar.gzFor details and best practices for creating your Singularity recipe, read about them here. Previous Next Site last generated: Feb 15, 2022

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