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Merge pull request #10902 from estesp/10855-fix-add-host-doc

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Correct --add-host documentation regarding host IP address retrieval
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Jessie Frazelle 2015-02-26 17:25:01 -08:00
commit 94553f1ba6
1 changed files with 15 additions and 7 deletions
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22
docs/sources/reference/commandline/cli.md
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@ -1966,13 +1966,21 @@ You can add other hosts into a container's `/etc/hosts` file by using one or mor
round-trip min/avg/max/stddev = 7.600/19.152/30.705/11.553 ms
```
> **Note:**
> Sometimes you need to connect to the Docker host, which means getting the IP
> address of the host. You can use the following shell commands to simplify this
> process:
>
> $ alias hostip="ip route show 0.0.0.0/0 | grep -Eo 'via \S+' | awk '{ print \$2 }'"
> $ docker run --add-host=docker:$(hostip) --rm -it debian
Sometimes you need to connect to the Docker host from within your
container. To enable this, pass the Docker host's IP address to
the container using the `--add-host` flag. To find the host's address,
use the `ip addr show` command.
The flags you pass to `ip addr show` depend on whether you are
using IPv4 or IPv6 networking in your containers. Use the following
flags for IPv4 address retrieval for a network device named `eth0`:
$ HOSTIP=`ip -4 addr show scope global dev eth0 | grep inet | awk '{print \$2}' | cut -d / -f 1`
$ docker run --add-host=docker:${HOSTIP} --rm -it debian
For IPv6 use the `-6` flag instead of the `-4` flag. For other network
devices, replace `eth0` with the correct device name (for example `docker0`
for the bridge device).
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