Domain reachability check command

We could add a gitlab-ctl command that would allow us to automatically check the availability of the record that the user has set as GitLab URL.

Something like gitlab-ctl reachability-check that would see if the external_url is resolvable.

If it is not, it can print a nice message to inform the user that something is possibly wrong.

We first need to investigate the challenges of this approach and what is possible to do when instance is publicly facing and when it is only internally visible.

marked this issue as related to #2617

marked this issue as related to #2619 (closed)

marked this issue as related to #2561

mentioned in issue #2561

@marin can we consider the LE staging API to do this? Would also check port 80 availability etc.

We would just need to have something listening.

added Scheduled and removed Unscheduled labels

changed milestone to %10.0

mentioned in issue #2519 (closed)

mentioned in merge request !1839 (closed)

Moving to 10.1 as this will be part of LE support. I don't think we need a separate exposed command, rather this can be rolled into the new installation method which will generate LE certs.

changed milestone to %10.1