Do not check if Port is already in use with --validate-config

[mnietz]

What happened?

It's not a Bug but a Feature-Request.

When validating the Patroni-Config on a running cluster it exit with code 1 and the following messages:

$ patroni --validate-config /etc/patroni/patroni.yml ; echo $?
restapi.listen 0.0.0.0:8008 didn't pass validation: Port 8008 is already in use.
postgresql.listen 0.0.0.0:5432 didn't pass validation: Port 5432 is already in use.
1

This makes it not possible to validate the config prior to a restart, for example within an ansible-template using validate:

https://docs.ansible.com/ansible/latest/collections/ansible/builtin/template_module.html#parameter-validate

It would be pretty good to have a check/validate mode like nginx -t or haproxy -c that could be integrated into automation-tools.

How can we reproduce it (as minimally and precisely as possible)?

Just validate the config of an already running cluster

What did you expect to happen?

exit with 0 if config is valid

Patroni/PostgreSQL/DCS version

• Patroni version: 3.3
• PostgreSQL version: 17
• DCS (and its version): etcd 3.5.7

Patroni configuration file

n/a

patronictl show-config

n/a

Patroni log files

n/a

PostgreSQL log files

n/a

Have you tried to use GitHub issue search?

• Yes

Anything else we need to know?

No response