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John Mulhausen 2016-11-28 14:52:55 -08:00 committed by GitHub
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10
engine/tutorials/dockerimages.md
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@ -572,12 +572,14 @@ Delete the `training/sinatra` image as you don't need it anymore.
An image is An image is
[stored in layers](../userguide/storagedriver/imagesandcontainers.md), [stored in layers](../userguide/storagedriver/imagesandcontainers.md),
and shared with other images, the real disk usage depends on existing layers shared with other images on the host, so the real disk usage depends on
on your host. A container is running on how much layer overlap is happening between images on a host.
A container runs on
[a writable layer](../userguide/storagedriver/imagesandcontainers.md#/container-and-layers) [a writable layer](../userguide/storagedriver/imagesandcontainers.md#/container-and-layers)
on top of a readonly rootfs. on top of a readonly rootfs.
You can figure the size of image layers with `docker history` command. Use `docker history` to see the size of image layers on your host:
$ docker history centos:centos7 $ docker history centos:centos7
@ -587,7 +589,7 @@ You can figure the size of image layers with `docker history` command.
<missing> 6 weeks ago /bin/sh -c #(nop) ADD file:44ef4e10b27d8c464a 196.7 MB <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 <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`. Check the size of containers with `docker ps -s`:
$ docker ps -s $ docker ps -s