open-port: command not found

Andrew Wilkins andrew.wilkins at
Mon Oct 23 09:20:31 UTC 2017

On Mon, Oct 23, 2017 at 5:12 PM Marco Ceppi <marco.ceppi at>

> On Mon, Oct 23, 2017, 03:59 Andrew Wilkins <andrew.wilkins at>
> wrote:
>> On Mon, Oct 23, 2017 at 4:20 AM Akshat Jiwan Sharma <
>> akshatjiwan at> wrote:
>>> HI,
>>> I'm trying to manually expose a port on a juju machine. According to this
>>> answer
>>> <>
>>> I should be able to do something like this:-
>>>  juju run  "open-port 443" --all
>>> However when I type this in my shell it throws an error
>>> open-port: command not found
>> The different between the command you're running, and the one on
>> AskUbuntu, is that you're not passing --unit. When you pass --unit, it runs
>> the command in the context of a unit on the machine. You must be running in
>> the context of a unit to use "hook tools", such as open-port.
> It seems weird that `juju run` behaves differently when using --unit and
> --all, is there a particular reason for that? I wouldn't expect the above
> command to fail.

`juju run` supports running commands in either a machine or unit context.
Only if you run within a unit context do you get access to hook tools.
Hooks require a unit context.

"--all" means "all machines", so the command runs in a machine context, for
each machine. You could have multiple units on a machine, so we can't
automatically choose a unit. Even if we could, what would be the use case
for doing that? Different machines will run different applications, which
will each have their own firewall requirements.

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