apptainer sign
Add digital signature(s) to an image
Synopsis
The sign command allows a user to add one or more digital signatures to a SIF image. By default, one digital signature is added for each object group in the file.
Key material can be provided via PEM-encoded file, or an entity in the PGP keyring. To manage the PGP keyring, see ‘apptainer help key’.
apptainer sign [sign options...] <image path>
Examples
Sign with a private key:
$ apptainer sign --key private.pem container.sif
Sign with PGP:
$ apptainer sign container.sif
Options
-g, --group-id uint32 sign objects with the specified group ID
-h, --help help for sign
--key string path to the private key file
-k, --keyidx int PGP private key to use (index from 'key list --secret')
-i, --sif-id uint32 sign object with the specified ID