postgresql change clustername but pg_lsclusters say it not changed

[Kadyn]

SELECT current_setting('cluster_name'), current_setting('server_version');

return:

 current_setting |         current_setting
-----------------+----------------------------------
 my_cluster_14   | 14.3 (Ubuntu 14.3-1.pgdg20.04+1)

My Ubuntu version:

Distributor ID: Ubuntu
Description:    Ubuntu 20.04.4 LTS
Release:        20.04
Codename:       focal

But when I run pg_lsclusters It return

Ver Cluster Port Status Owner    Data directory              Log file
14  main    5432 online postgres /var/lib/postgresql/14/main /var/log/postgresql/postgresql-14-main.log

which means I can only do

sudo /usr/bin/pg_ctlcluster 14/main reload

I cannot do

/usr/bin/pg_ctlcluster 14/my_cluster_14 reload

I thought If I renamed the cluster name, I can do

/usr/bin/pg_ctlcluster 14/my_cluster_14 reload

So is possible to run /usr/bin/pg_ctlcluster 14/my_cluster_14 reload?
What the use case of rename the cluster_name? \

---

solved via sudo /usr/bin/pg_renamecluster 14 main my_cluster_14

[Rossere]

Use the https://manpages.org/pg_renamecluster command:

pg_renamecluster changes the name of a PostgreSQL cluster, i. e. the name of the config directory in /etc/postgresql/version/ along with the data directory in /var/lib/postgresql/version/. Existing log files in /var/log/postgresql/ are also renamed. The cluster is stopped and started for the operation.

The following postgresql.conf config options are updated to refer to the changed path names: data_directory, hba_file, ident_file, external_pid_file, stats_temp_directory.

Cluster names are a Debian convention, the name is not explicitly known to the cluster itself. From the PostgreSQL viewpoint, the name is merely a substring of various path names.