singularity-sign - Add digital signature(s) to an image

NAME  SYNOPSIS  DESCRIPTION  OPTIONS  EXAMPLE  SEE ALSO  HISTORY 

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NAME

singularity-sign - Add digital signature(s) to an image

SYNOPSIS

singularity sign [sign options...]

DESCRIPTION

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 ’singularity help key’.

--cosign mode supports signing an OCI image within an OCI-SIF file with a
cosign-compatible signature. A private key must be provided with the --key
flag.

OPTIONS

		-c, --cosign[=false]	sign an OCI-SIF with a cosign-compatible sigstore signature
		-g, --group-id=0	sign objects with the specified group ID
		-h, --help[=false]	help for sign
		--key=""	path to the private key file
		-k, --keyidx=0	PGP private key to use (index from ’key list --secret’)
		-i, --sif-id=0	sign object with the specified ID

EXAMPLE

Sign with a private key:
$ singularity sign --key private.pem container.sif

Sign with PGP:
$ singularity sign container.sif

Sign an image within an OCI-SIF with a cosign compatible signature:
$ singularity sign --cosign --key cosign.key container.oci.sif

SEE ALSO

singularity(1)

HISTORY

15-May-2026 Auto generated by spf13/cobra

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