Ubuntu Manpage: skopeo-sync - Synchronize images between container registries and local directories.

NAME

       skopeo-sync - Synchronize images between container registries and local directories.

SYNOPSIS

       skopeo sync [options] --src transport --dest transport source destination

DESCRIPTION

Synchronize images between container registries and local directories. The
synchronization is achieved by copying all the images found at source to destination.

Useful to synchronize a local container registry mirror, and to to populate registries
running inside of air-gapped environments.

Differently from other skopeo commands, skopeo sync requires both source and destination
transports to be specified separately from source and destination. One of the problems of
prefixing a destination with its transport is that, the registry docker://hostname:port
would be wrongly interpreted as an image reference at a non-fully qualified registry, with
hostname and port the image name and tag.

Available source transports:
- docker (i.e. --src docker): source is a repository hosted on a container registry
(e.g.: registry.example.com/busybox).
If no image tag is specified, skopeo sync copies all the tags found in that repository.
- dir (i.e. --src dir): source is a local directory path (e.g.: /media/usb/). Refer to
skopeo(1) dir:path for the local image format.
- yaml (i.e. --src yaml): source is local YAML file path.
The YAML file should specify the list of images copied from different container
registries (local directories are not supported). Refer to EXAMPLES for the file format.

Available destination transports:
- docker (i.e. --dest docker): destination is a container registry (e.g.: my-
registry.local.lan).
- dir (i.e. --dest dir): destination is a local directory path (e.g.: /media/usb/).
One directory per source 'image:tag' is created for each copied image.

When the --scoped option is specified, images are prefixed with the source image path so
that multiple images with the same name can be stored at destination.

OPTIONS

--all, -a If one of the images in src refers to a list of images, instead of copying just
the image which matches the current OS and architecture (subject to the use of the global
--override-os, --override-arch and --override-variant options), attempt to copy all of the
images in the list, and the list itself.

--authfile path

Path of the authentication file. Default is ${XDG_RUNTIME_DIR}/containers/auth.json, which
is set using skopeo login. If the authorization state is not found there,
$HOME/.docker/config.json is checked, which is set using docker login.

--src-authfile path

Path of the authentication file for the source registry. Uses path given by --authfile, if
not provided.

--dest-authfile path

Path of the authentication file for the destination registry. Uses path given by
--authfile, if not provided.

--dry-run

Run the sync without actually copying data to the destination.

--src, -s transport Transport for the source repository.

--dest, -d transport Destination transport.

--format, -f manifest-type Manifest Type (oci, v2s1, or v2s2) to use when syncing image(s)
to a destination (default is manifest type of source, with fallbacks).

--help, -h

Print usage statement.

--scoped Prefix images with the source image path, so that multiple images with the same
name can be stored at destination.

--preserve-digests Preserve the digests during copying. Fail if the digest cannot be
preserved.

--remove-signatures Do not copy signatures, if any, from source-image. This is necessary
when copying a signed image to a destination which does not support signatures.

--sign-by key-id

Add a “simple signing” signature using that key ID for an image name corresponding to
destination-image

--sign-by-sigstore-private-key path

Add a sigstore signature using a private key at path for an image name corresponding to
destination-image

--sign-passphrase-file path

The passphare to use when signing with --sign-by or --sign-by-sigstore-private-key. Only
the first line will be read. A passphrase stored in a file is of questionable security if
other users can read this file. Do not use this option if at all avoidable.

--src-creds username[:password] for accessing the source registry.

--dest-creds username[:password] for accessing the destination registry.

--src-cert-dir path Use certificates (*.crt, *.cert, *.key) at path to connect to the
source registry or daemon.

--src-no-creds Access the registry anonymously.

--src-tls-verify=bool Require HTTPS and verify certificates when talking to a container
source registry or daemon. Default to source registry entry in registry.conf setting.

--dest-cert-dir path Use certificates (*.crt, *.cert, *.key) at path to connect to the
destination registry or daemon.

--dest-no-creds Access the registry anonymously.

--dest-tls-verify=bool Require HTTPS and verify certificates when talking to a container
destination registry or daemon. Default to destination registry entry in registry.conf
setting.

--src-registry-token Bearer token for accessing the source registry.

--dest-registry-token Bearer token for accessing the destination registry.

--retry-times the number of times to retry, retry wait time will be exponentially
increased based on the number of failed attempts.

--keep-going If any errors occur during copying of images, those errors are logged and the
process continues syncing rest of the images and finally fails at the end.

--src-username

The username to access the source registry.

--src-password

The password to access the source registry.

--dest-username

The username to access the destination registry.

--dest-password

The password to access the destination registry.

EXAMPLES

   Synchronizing to a local directory
              $ skopeo sync --src docker --dest dir registry.example.com/busybox /media/usb

       Images are located at:

              /media/usb/busybox:1-glibc
              /media/usb/busybox:1-musl
              /media/usb/busybox:1-ubuntu
              /media/usb/busybox:latest

   Synchronizing to a container registry from local
       Images are located at:

              /media/usb/busybox:1-glibc

       Sync run

              $ skopeo sync --src dir --dest docker /media/usb/busybox:1-glibc my-registry.local.lan/test/

       Destination registry content:

              REPO                                 TAGS
              my-registry.local.lan/test/busybox   1-glibc

   Synchronizing to a local directory, scoped
              $ skopeo sync --src docker --dest dir --scoped registry.example.com/busybox /media/usb

       Images are located at:

              /media/usb/registry.example.com/busybox:1-glibc
              /media/usb/registry.example.com/busybox:1-musl
              /media/usb/registry.example.com/busybox:1-ubuntu
              /media/usb/registry.example.com/busybox:latest

   Synchronizing to a container registry
              skopeo sync --src docker --dest docker registry.example.com/busybox my-registry.local.lan

       Destination registry content:

              REPO                         TAGS
              registry.local.lan/busybox   1-glibc, 1-musl, 1-ubuntu, ..., latest

   Synchronizing to a container registry keeping the repository
              skopeo sync --src docker --dest docker registry.example.com/repo/busybox my-registry.local.lan/repo

       Destination registry content:

              REPO                              TAGS
              registry.local.lan/repo/busybox   1-glibc, 1-musl, 1-ubuntu, ..., latest

   YAML file content (used source for **--src yaml**)
              registry.example.com:
                  images:
                      busybox: []
                      redis:
                          - "1.0"
                          - "2.0"
                          - "sha256:0000000000000000000000000000000011111111111111111111111111111111"
                  images-by-tag-regex:
                      nginx: ^1\.13\.[12]-alpine-perl$
                  credentials:
                      username: john
                      password: this is a secret
                  tls-verify: true
                  cert-dir: /home/john/certs
              quay.io:
                  tls-verify: false
                  images:
                      coreos/etcd:
                          - latest

       If the yaml filename is sync.yml, sync run:

              skopeo sync --src yaml --dest docker sync.yml my-registry.local.lan/repo/

       This will copy  the  following  images:  -  Repository  registry.example.com/busybox:  all
       images,  as no tags are specified.  - Repository registry.example.com/redis: images tagged
       "1.0"       and       "2.0"       along        with        image        with        digest
       "sha256:0000000000000000000000000000000011111111111111111111111111111111".   -  Repository
       registry.example.com/nginx: images tagged "1.13.1-alpine-perl"  and  "1.13.2-alpine-perl".
       - Repository quay.io/coreos/etcd: images tagged "latest".

       For the registry registry.example.com, the "john"/"this is a secret" credentials are used,
       with server TLS certificates located at /home/john/certs.

       TLS verification is normally enabled, and it can be disabled setting tls-verify to  false.
       In  the  above  example,  TLS  verification  is enabled for registry.example.com, while is
       disabled for quay.io.

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