How to expose a deployed application
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By default, once an application is deployed, it is only reachable by other applications in the same Juju model. However, if the particular deployment use case requires for the application to be reachable by Internet traffic (e.g. a web server, Wordpress installation etc.), Juju needs to tweak the backing cloud’s firewall rules to allow Internet traffic to reach the application. This is done with the juju expose command.
After running a juju expose command, any ports opened by the application’s charmed operator will become accessible by any public or private IP address.
Since Juju 2.9, operators can explicitly specify the list of CIDRs and/or spaces that should be able to access the ports opened by the application. See Controlling application expose settings via the Juju CLI to learn more about this feature.
Assuming the wordpress application has been deployed (and a relation has been made to the deployed database mariadb), the following command can be used to expose the application outside the Juju model:
juju expose wordpress
When running juju status, its output will not only indicate whether an application is exposed or not, but also the public address that can be used to access each exposed application:
App Version Status Scale Charm Rev Exposed Message
mariadb 10.1.36 active 1 mariadb 7 no
wordpress active 1 wordpress 5 yes exposed
Unit Workload Agent Machine Public address Ports Message
mariadb/0* active idle 1 54.147.127.19 ready
wordpress/0* active idle 0 54.224.246.234 80/tcp
The juju unexpose command can be used to undo the firewall changes and once again only allow the application to be accessed by applications in the same Juju model:
juju unexpose wordpress
Last updated 10 months ago.