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Explain -s flag on docker ps 

https://github.com/docker/docker.github.io/issues/1520#issuecomment-467971886

Signed-off-by: Forest Johnson <fjohnson@peoplenetonline.com>
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
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Forest Johnson 2019-02-27 15:03:09 -06:00 committed by Sebastiaan van Stijn
parent e505a7c216
commit f7ab2987c3
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18
docs/reference/commandline/ps.md
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@ -75,6 +75,22 @@ $ docker ps -a
container that exposes TCP ports `100, 101, 102` displays `100-102/tcp` in
the `PORTS` column.
### Show disk usage by container
The `docker ps -s` command displays two different on-disk-sizes for each container:
```bash
$ docker ps -s
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES SIZE SIZE
e90b8831a4b8 nginx "/bin/bash -c 'mkdir " 11 weeks ago Up 4 hours my_nginx 35.58 kB (virtual 109.2 MB)
00c6131c5e30 telegraf:1.5 "/entrypoint.sh" 11 weeks ago Up 11 weeks my_telegraf 0 B (virtual 209.5 MB)
```
* The "size" information shows the amount of data (on disk) that is used for the _writable_ layer of each container
* The "virtual size" is the total amount of disk-space used for the read-only _image_ data used by the container and the writable layer.
For more information, refer to the [container size on disk](https://docs.docker.com/storage/storagedriver/#container-size-on-disk) section.
### Filtering
The filtering flag (`-f` or `--filter`) format is a `key=value` pair. If there is more
@ -432,4 +448,4 @@ a87ecb4f327c com.docker.swarm.node=ubuntu,com.docker.swarm.storage=ssd
01946d9d34d8
c1d3b0166030 com.docker.swarm.node=debian,com.docker.swarm.cpu=6
41d50ecd2f57 com.docker.swarm.node=fedora,com.docker.swarm.cpu=3,com.docker.swarm.storage=ssd
```
```