juju run --application runs as every unit of the application, thus we have individual units (if you have 2 units of an application on a machine it will run twice on that machine). 'juju run --unit" obviously runs as a unit. 'juju machine' can't, because we don't have any unit associated with it.
John =:-> On Tue, May 23, 2017 at 5:12 PM, Jay Wren <jay.w...@canonical.com> wrote: > I was under the impression that `juju run --unit` does run in a hook > context. In fact, the help for `juju help run` explicitly says: > > ``` > Commands run for applications or units are executed in a 'hook context' for > the unit. > ``` > > A quick test: > > ``` > > juju run --unit u4/0 'echo $JUJU_UNIT_NAME' > u4/0 > ``` > > So indeed, $JUJU_UNIT_NAME is set when using `juju run --unit`. > > However, another quick test shows that it is not set in the machine case: > > ``` > > juju run --machine 0 'echo $JUJU_UNIT_NAME' > > ``` > > But it is set when using --application, which surprised me: > ``` > juju run --application u4 'echo $JUJU_UNIT_NAME' > - Stdout: | > u4/0 > UnitId: u4/0 > - Stdout: | > u4/1 > UnitId: u4/1 > ``` > > James, maybe you have used ssh to get shell on the machine instead of > using juju run? > > -- > Jay > > On Tue, May 23, 2017 at 7:57 AM, Nick Veitch <nick.vei...@canonical.com> > wrote: > >> >> >> On 23 May 2017 at 11:23, Junien Fridrick <junien.fridr...@canonical.com> >> wrote: >> >>> >>> You can run some hooks like config-changed with e.g. : >>> >>> $ juju run --unit foo/0 hooks/config-changed >>> >> >> You can run any hook like that, but if it requires a hook context (as in >> the example of trying to read $JUJU_UNIT_NAME ) it won't work. A lot of >> hooks in common charms don't need context, but you can't guarantee that. >> >> N.B. Also when using `juju debug-hooks` once any hook fires and you are >> in the hook environment, you can then execute any hook (not just the one >> that has been triggered), if you need to test them. >> >> -- >> Nick Veitch, >> Documentation >> Canonical >> >> -- >> Juju mailing list >> Juju@lists.ubuntu.com >> Modify settings or unsubscribe at: https://lists.ubuntu.com/mailm >> an/listinfo/juju >> >> > > -- > Juju mailing list > Juju@lists.ubuntu.com > Modify settings or unsubscribe at: https://lists.ubuntu.com/ > mailman/listinfo/juju > >
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