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Added load save import export

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Example of load/save image and import/export container. Briefly explained the difference between them
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Amir Bawab 2016-07-02 17:01:45 -04:00 • committed by GitHub
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@ -15,6 +15,7 @@
* [Layers](#layers)
* [Links](#links)
* [Volumes](#volumes)
* [Load/Save Import/Export](#load-save-import-export)
* [Exposing Ports](#exposing-ports)
* [Best Practices](#best-practices)
* [Security](#security)
@ -332,6 +333,41 @@ You can also use remote NFS volumes if you're [feeling brave](https://web.archiv
You may also consider running data-only containers as described [here](http://container42.com/2013/12/16/persistent-volumes-with-docker-container-as-volume-pattern/) to provide some data portability.
## Load/Save Import/Export
Docker allows you to load/save images and import/export containers.
### Load/Save image
Load an image from file:
```
docker load < my_image.tar.gz
```
Save an existing image:
```
docker save my_image:my_tag > my_image.tar.gz
```
### Import/Export container
Import a container as an image from file:
```
cat my_container.tar.gz | docker import - my_image:my_tag
```
Export an existing container:
```
docker export my_container > my_container.tar.gz
```
### Difference between loading a saved image and importing an exported container as an image ?
Loading an image using the `load` command creates a new image including its history.
Importing a container as an image using the `import` command creates an new image excluding the history which results in a smaller image size compared to loading an image.
## Exposing ports
Exposing incoming ports through the host container is [fiddly but doable](https://docs.docker.com/reference/run/#expose-incoming-ports).