cmd/juju: juju ssh $SERVICE tries to work

[Dave Cheney]

Juju ssh supports two modes

juju ssh $MACHINE
juju ssh $SERVICE/$UNIT

However if you forget the $UNIT, you get this confusing message

lucky(~/src/launchpad.net/juju-core/repostory/trusty/juju-development/hooks) % juju deploy mysql
Added charm "cs:precise/mysql-42" to the environment.
lucky(~/src/launchpad.net/juju-core/repostory/trusty/juju-development/hooks) % juju status mysql
environment: us-east-1
machines:
  "9":
    agent-state: pending
    instance-id: i-063bf656
    instance-state: pending
    series: precise
    hardware: arch=amd64 cpu-cores=1 cpu-power=100 mem=1740M root-disk=8192M
services:
  mysql:
    charm: cs:precise/mysql-42
    exposed: false
    relations:
      cluster:
      - mysql
    units:
      mysql/0:
        agent-state: pending
        machine: "9"
lucky(~/src/launchpad.net/juju-core/repostory/trusty/juju-development/hooks) % juju ssh mysql
nc: getaddrinfo: Name or service not known
ERROR subprocess encountered error code 1
ssh_exchange_identification: Connection closed by remote host
ERROR subprocess encountered error code 255

[Jimmie Butler (jimmiebtlr)]

It assumes that if it's not a machine or a unit, then it must be a hostname. It seems mysql would be a valid hostname.

Would the best approach be to wait until the hostname resolution has failed and output an error message with some suggestions?

[Anastasia (anastasia-macmood)]

Re-targeting for Juju 2.x

From Menno:
The command is trying the application (aka service) name as a hostname because it doesn't support application names. Consequently, it fails with the "Name or service not known" error.

It may be enough to improve the error to give a little more detail.

[Canonical Juju QA Bot (juju-qa-bot)]

This bug has not been updated in 5 years, so we're marking it Expired. If you believe this is incorrect, please update the status.