The Sylabs Cloud also provides a Remote Builder, allowing you to build containers on a secure remote service. This is convenient so that you can build containers on systems where you do not have root privileges.
Make an Account¶
Making an account is easy, and straightforward:
- Go to: https://cloud.sylabs.io/library.
- Click “Sign in to Sylabs” (top right corner).
- Select your method to sign in, with Google, GitHub, GitLab, or Microsoft.
- Type your passwords, and that’s it!
Creating a Access token¶
Access tokens for pushing a container, and remote builder.
To generate a access token, do the following steps:
- Go to: https://cloud.sylabs.io/
- Click “Sign in to Sylabs” and follow the sign in steps.
- Click on your login id (same and updated button as the Sign in one).
- Select “Access Tokens” from the drop down menu.
- Enter a name for your new access token, such as “test token”
- Click the “Create a New Access Token” button.
- Click “Copy token to Clipboard” from the “New API Token” page.
singularity remote loginand paste the access token at the prompt.
Now that you have your token, you are ready to push your container!
Pushing a Container¶
singularity push command will push a container to the container library with the given URL. Here’s an example
of a typical push command:
$ singularity push my-container.sif library://your-name/project-dir/my-container:latest
:latest is the container tag. Tags are used to have different version of the same container.
When pushing your container, theres no need to add a
.sif (Singularity Image Format) to the end of the container name, (like
on your local machine), because all containers on the library are SIF containers.
Let’s assume you have your container (v1.0.1), and you want to push that container without deleting
:latest container, then you can add a version tag to that container, like so:
$ singularity push my-container.sif library://your-name/project-dir/my-container:1.0.1
You can download the container with that tag by replacing the
:latest, with the tagged container you want to download.
Pulling a container¶
When pulling from Docker, the container will automatically be converted to a SIF (Singularity Image Format) container.
Here’s a typical pull command:
$ singularity pull file-out.sif library://alpine:latest # or pull from docker: $ singularity pull file-out.sif docker://alpine:latest
If there’s no tag after the container name, Singularity automatically will pull the container with the
To pull a container with a specific tag, just add the tag to the library URL:
$ singularity pull file-out.sif library://alpine:3.8
Of course, you can pull your own containers. Here’s what that will look like:
Pulling your own container¶
Pulling your own container is just like pulling from Github, Docker, etc…
$ singularity pull out-file.sif library://your-name/project-dir/my-container:latest # or use a different tag: $ singularity pull out-file.sif library://your-name/project-dir/my-container:1.0.1
You don’t have to specify a output file, one will be created automatically, but it’s good practice to always specify your output file.
Verify/Sign your Container¶
Verify containers that you pull from the library, ensuring they are bit-for-bit reproductions of the original image.
Searching the Library for Containers¶
When it comes to searching the library, you could always go to: https://cloud.sylabs.io/library and search from there
through the web GUI. Or you can use
singularity search <container/user>, this will search the library for
Using the CLI Search¶
Here is an example for searching the library for
$ singularity search centos No users found for 'centos' No collections found for 'centos' Found 6 containers for 'centos' library://dtrudg/linux/centos Tags: 6 7 centos6 centos7 latest library://library/default/centos Tags: 6 7 latest library://gmk/demo/centos-vim Tags: latest library://mroche/baseline/centos Tags: 7 7.5 7.5.1804 7.6 7.6.1810 latest library://gmk/default/centos7-devel Tags: latest library://emmeff/default/centos7-python36 Tags: 1.0
Notice there are different tags for the same container.
The remote builder service can build your container in the cloud removing the requirement for root access.
Here’s a typical remote build command:
$ singularity build --remote file-out.sif docker://ubuntu:18.04
Building from a definition file:¶
This is our definition file. Let’s call it
bootstrap: library from: ubuntu:18.04 %runscript echo "hello world from ubuntu container!"
Now, to build the container, use the
--remote flag, and without
$ singularity build --remote ubuntu.sif ubuntu.def
Make sure you have a access token, otherwise the build will fail.
After building, you can test your container like so:
$ ./ubuntu.sif hello world from ubuntu container!
You can also use the web GUI to build containers remotely. First, go to https://cloud.sylabs.io/builder (make sure you are signed in). Then you can copy and paste, upload, or type your definition file. When you are finished, click build. Then you can download the container with the URL.