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[bug#41786] [PATCH 2/2] doc: Explain how to use psql with peer authentic
From: |
Pierre Neidhardt |
Subject: |
[bug#41786] [PATCH 2/2] doc: Explain how to use psql with peer authentication. |
Date: |
Tue, 28 Jul 2020 13:58:36 +0200 |
* doc/guix.texi (Database Services): Add example of shell commands to use psql
as system user. Also add troubleshooting tip when service fails to start
because of incompatible cluster.
---
doc/guix.texi | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/doc/guix.texi b/doc/guix.texi
index 74c7417174..aba3f925b9 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -17260,6 +17260,24 @@ The PostgreSQL daemon loads its runtime configuration
from @var{config-file},
creates a database cluster with @var{locale} as the default
locale, stored in @var{data-directory}. It then listens on @var{port}.
+If the services fails to start, it may be due to an incompatible
+cluster already present in @var{data-directory}. Adjust it (or, if you
+don't need the cluster anymore, delete @var{data-directory}), then
+restart the service.
+
+Peer authentication is used by default and the @code{postgres} user
+account has no shell, which prevents the direct execution of @code{psql}
+commands as this user. To use @code{psql}, you can temporarily log in
+as @code{postgres} using a shell, create a PostgreSQL superuser with the
+same name as one of the system users and then create the associated
+database.
+
+@example
+sudo -u postgres -s /bin/sh
+createuser --interface
+createdb $MY_USER_LOGIN # Replace appropriately.
+@end example
+
@cindex postgresql extension-packages
Additional extensions are loaded from packages listed in
@var{extension-packages}. Extensions are available at runtime. For instance,
--
2.27.0