Export and import of docker containers

export container

If you want to export a local container, you can use docker exportthe command.

$ docker container ls -a

CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS                    PORTS               NAMES
7691a814370e        ubuntu:18.04        "/bin/bash"         36 hours ago        Exited (0) 21 hours ago                       test



$ docker export 7691a814370e > ubuntu.tar

This will export the container snapshot to a local file.

Import container snapshot

docker importReimport as an image from a container snapshot file can be used , e.g.

$ cat ubuntu.tar | docker import - test/ubuntu:v1.0



$ docker image ls

REPOSITORY          TAG                 IMAGE ID            CREATED              VIRTUAL SIZE
test/ubuntu         v1.0                9d37a6082e97        About a minute ago   171.3 MB

In addition, you can also import by specifying a URL or a directory, for example

$ docker import http://example.com/exampleimage.tgz example/imagerepo

Note: Users can either use docker load to import image storage files to the local image library, or use docker import to import a container snapshot to the local image library. The difference between the two is that the container snapshot file will discard all historical records and metadata information (that is, only save the snapshot state of the container at that time), while the image storage file will save a complete record, and the volume is also large. In addition, metadata information such as tags can be re-specified when importing from a container snapshot file.

link: https://yeasy.gitbook.io/docker_practice/container/import_export