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

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This commit is contained in:
Steve Francia 2015-02-19 17:22:53 -05:00
commit 356fe89d24
3 changed files with 36 additions and 16 deletions
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8
daemon/container.go
View file

@ -458,7 +458,13 @@ func (container *Container) buildHostsFiles(IP string) error {
for linkAlias, child := range children {
_, alias := path.Split(linkAlias)
extraContent = append(extraContent, etchosts.Record{Hosts: alias, IP: child.NetworkSettings.IPAddress})
// allow access to the linked container via the alias, real name, and container hostname
aliasList := alias + " " + child.Config.Hostname
// only add the name if alias isn't equal to the name
if alias != child.Name[1:] {
aliasList = aliasList + " " + child.Name[1:]
}
extraContent = append(extraContent, etchosts.Record{Hosts: aliasList, IP: child.NetworkSettings.IPAddress})
}
for _, extraHost := range container.hostConfig.ExtraHosts {

15
docs/sources/userguide/dockerlinks.md
View file

@ -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

29
integration-cli/docker_cli_links_test.go
View file

@ -83,16 +83,27 @@ func TestLinksInvalidContainerTarget(t *testing.T) {
}
func TestLinksPingLinkedContainers(t *testing.T) {
var out string
out, _, _ = dockerCmd(t, "run", "-d", "--name", "container1", "busybox", "sleep", "10")
idA := stripTrailingCharacters(out)
out, _, _ = dockerCmd(t, "run", "-d", "--name", "container2", "busybox", "sleep", "10")
idB := stripTrailingCharacters(out)
dockerCmd(t, "run", "--rm", "--link", "container1:alias1", "--link", "container2:alias2", "busybox", "sh", "-c", "ping -c 1 alias1 -W 1 && ping -c 1 alias2 -W 1")
dockerCmd(t, "kill", idA)
dockerCmd(t, "kill", idB)
deleteAllContainers()
runCmd := exec.Command(dockerBinary, "run", "-d", "--name", "container1", "--hostname", "fred", "busybox", "top")
if _, err := runCommand(runCmd); err != nil {
t.Fatal(err)
}
runCmd = exec.Command(dockerBinary, "run", "-d", "--name", "container2", "--hostname", "wilma", "busybox", "top")
if _, err := runCommand(runCmd); err != nil {
t.Fatal(err)
}
runArgs := []string{"run", "--rm", "--link", "container1:alias1", "--link", "container2:alias2", "busybox", "sh", "-c"}
pingCmd := "ping -c 1 %s -W 1 && ping -c 1 %s -W 1"
// test ping by alias, ping by name, and ping by hostname
// 1. Ping by alias
dockerCmd(t, append(runArgs, fmt.Sprintf(pingCmd, "alias1", "alias2"))...)
// 2. Ping by container name
dockerCmd(t, append(runArgs, fmt.Sprintf(pingCmd, "container1", "container2"))...)
// 3. Ping by hostname
dockerCmd(t, append(runArgs, fmt.Sprintf(pingCmd, "fred", "wilma"))...)
deleteAllContainers()
logDone("links - ping linked container")
}