There is no reason that the base node access method should be run
under supervisor, which exists primarily to give access to the `zulip`
user to restart its managed services. This access is unnecessary for
Teleport, and also causes unwanted restarts of Teleport services when
the `supervisor` base configuration changes. Additionally,
supervisor does not support the in-place upgrade process that Teleport
uses, as it replaces its core process with a new one.
Switch to installing a systemd configuration file (as generated by
`teleport install systemd`) for each part of Teleport, customized to
pass a `--config` path. As such, we explicitly disable the `teleport`
service provided by the package.
The supervisor process is shut down by dint of no longer installing
the file, which purges it from the managed directory, and reloads
Supervisor to pick up the removed service.
This requires switching to a reverse tunnel for the auth connection,
with the side effect that the `zulip_ops::teleport::node` manifest can
be applied on servers anywhere in the Internet; they do not need to
have any publicly-available open ports.
Alex Vandiver