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Explain downloaded image and container sizes 

Signed-off-by: Yuqian Yang <boscoyoung@gmail.com>
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Yuqian Yang 2016-11-01 18:48:25 +08:00
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@ -568,6 +568,33 @@ Delete the `training/sinatra` image as you don't need it anymore.
> **Note:** To remove an image from the host, please make sure
> that there are no containers actively based on it.
## Check sizes of images and containers
An image is
[stored in layers](../userguide/storagedriver/imagesandcontainers.md),
and shared with other images, the real disk usage depends on existing layers
on your host. A container is running on
[a writable layer](../userguide/storagedriver/imagesandcontainers.md#/container-and-layers)
on top of a readonly rootfs.
You can figure the size of image layers with `docker history` command.
$ docker history centos:centos7
IMAGE CREATED CREATED BY SIZE
970633036444 6 weeks ago /bin/sh -c #(nop) CMD ["/bin/bash"] 0 B
<missing> 6 weeks ago /bin/sh -c #(nop) LABEL name=CentOS Base Imag 0 B
<missing> 6 weeks ago /bin/sh -c #(nop) ADD file:44ef4e10b27d8c464a 196.7 MB
<missing> 10 weeks ago /bin/sh -c #(nop) MAINTAINER https://github.c 0 B
Also, you can check the sizes of containers by performing `docker ps` command with `-s`.
$ docker ps -s
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES SIZE
cb7827c19ef7 docker-docs:is-11160-explain-image-container-size-prediction "hugo server --port=8" About a minute ago Up About a minute 0.0.0.0:8000->8000/tcp evil_hodgkin 0 B (virtual 949.2 MB)
# Next steps
Until now you've seen how to build individual applications inside Docker