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Removed unnecessary complexity in readme.md

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In PostgreSQL, views run as the defining user, meaning you don't 
need a view wrapping a function (you can just have a view).  This 
improves readability, maintainability, performance, and clarity.
This commit is contained in:
Chris Travers 2017-09-12 12:08:36 +02:00 committed by Will Rouesnel
parent 0e9fccdb27
commit 8b4d70ae5f
1 changed files with 7 additions and 23 deletions
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30
README.md
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@ -99,7 +99,7 @@ Some examples are provided in [queries.yaml](queries.yaml).
### Running as non-superuser
To be able to collect metrics from pg_stat_activity and pg_stat_replication as non-superuser you have to create functions and views to do so.
To be able to collect metrics from pg_stat_activity and pg_stat_replication as non-superuser you have to create views as a superuser, and assign permissions separately to those. In PostgreSQL, views run with the permissions of the user that created them so they can act as security barriers.
```sql
CREATE USER postgres_exporter PASSWORD 'password';
@ -109,32 +109,16 @@ ALTER USER postgres_exporter SET SEARCH_PATH TO postgres_exporter,pg_catalog;
-- GRANT postgres_exporter TO :MASTER_USER;
CREATE SCHEMA postgres_exporter AUTHORIZATION postgres_exporter;
CREATE FUNCTION postgres_exporter.f_select_pg_stat_activity()
RETURNS setof pg_catalog.pg_stat_activity
LANGUAGE sql
SECURITY DEFINER
AS $$
SELECT * from pg_catalog.pg_stat_activity;
$$;
CREATE FUNCTION postgres_exporter.f_select_pg_stat_replication()
RETURNS setof pg_catalog.pg_stat_replication
LANGUAGE sql
SECURITY DEFINER
AS $$
SELECT * from pg_catalog.pg_stat_replication;
$$;
CREATE VIEW postgres_exporter.pg_stat_replication
AS
SELECT * FROM postgres_exporter.f_select_pg_stat_replication();
CREATE VIEW postgres_exporter.pg_stat_activity
AS
SELECT * FROM postgres_exporter.f_select_pg_stat_activity();
SELECT * from pg_catalog.pg_stat_activity;
GRANT SELECT ON postgres_exporter.pg_stat_activity TO postgres_exporter;
CREATE VIEW postgres_exporter.pg_stat_replication AS
SELECT * from pg_catalog.pg_stat_replication;
GRANT SELECT ON postgres_exporter.pg_stat_replication TO postgres_exporter;
GRANT SELECT ON postgres_exporter.pg_stat_activity TO postgres_exporter;
```
> **NOTE**