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I am looking at this doc which says the install hook is run first, but it does not specify which triggers the "install" hook. Is "juju deploy" command is the only way to trigger this hook? or are there any other mechanisms?.

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up vote 3 down vote accepted

Any time a new 'unit' is created the install hook is run, so deploy, add-unit etc. Its job is to install anything required for the proper operation of the charm on a new machine or container.

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