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Merge pull request #10818 from estesp/link-add-aliases

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Upstream-commit: 356fe89d2431bd54f38b3477aa91ef276f65ffb7
Component: engine
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Steve Francia
2015-02-19 17:22:53 -05:00
parent 9a0fe3fe5e c4aef2a226
commit 0385663f68
3 changed files with 36 additions and 16 deletions
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15
components/engine/docs/sources/userguide/dockerlinks.md
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@ -252,20 +252,23 @@ In addition to the environment variables, Docker adds a host entry for the
source container to the `/etc/hosts` file. Here's an entry for the `web`
container:
$ sudo docker run -t -i --rm --link db:db training/webapp /bin/bash
$ sudo docker run -t -i --rm --link db:webdb training/webapp /bin/bash
root@aed84ee21bde:/opt/webapp# cat /etc/hosts
172.17.0.7 aed84ee21bde
. . .
172.17.0.5 db
172.17.0.5 webdb 6e5cdeb2d300 db
You can see two relevant host entries. The first is an entry for the `web`
container that uses the Container ID as a host name. The second entry uses the
link alias to reference the IP address of the `db` container. You can ping
that host now via this host name.
link alias to reference the IP address of the `db` container. In addition to
the alias you provide, the linked container's name--if unique from the alias
provided to the `--link` parameter--and the linked container's hostname will
also be added in `/etc/hosts` for the linked container's IP address. You can ping
that host now via any of these entries:
root@aed84ee21bde:/opt/webapp# apt-get install -yqq inetutils-ping
root@aed84ee21bde:/opt/webapp# ping db
PING db (172.17.0.5): 48 data bytes
root@aed84ee21bde:/opt/webapp# ping webdb
PING webdb (172.17.0.5): 48 data bytes
56 bytes from 172.17.0.5: icmp_seq=0 ttl=64 time=0.267 ms
56 bytes from 172.17.0.5: icmp_seq=1 ttl=64 time=0.250 ms
56 bytes from 172.17.0.5: icmp_seq=2 ttl=64 time=0.256 ms