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README: SQL that supports re-execution

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Make the SQL work in automated deployments where it will be repeated many times.
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Sakis 2019-07-11 15:50:03 +02:00 committed by Will Rouesnel
parent 0d7891de1a
commit 1c14eb964a
1 changed files with 22 additions and 2 deletions
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README.md
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@ -178,7 +178,27 @@ data with the non-superuser. Only creating the views will leave out the most
important bits of data. important bits of data.
```sql ```sql
CREATE USER postgres_exporter PASSWORD 'password'; -- To use IF statements, hence to be able to check if the user exists before
-- attempting creation, we need to switch to procedural SQL (PL/pgSQL)
-- instead of standard SQL.
-- More: https://www.postgresql.org/docs/9.3/plpgsql-overview.html
-- To preserve compatibility with <9.0, DO blocks are not used; instead,
-- a function is created and dropped.
CREATE OR REPLACE FUNCTION __tmp_create_user() returns void as $$
BEGIN
IF NOT EXISTS (
SELECT -- SELECT list can stay empty for this
FROM pg_catalog.pg_user
WHERE usename = 'postgres_exporter') THEN
CREATE USER postgres_exporter;
END IF;
END;
$$ language plpgsql;
SELECT __tmp_create_user();
DROP FUNCTION __tmp_create_user();
ALTER USER postgres_exporter WITH PASSWORD 'password';
ALTER USER postgres_exporter SET SEARCH_PATH TO postgres_exporter,pg_catalog; ALTER USER postgres_exporter SET SEARCH_PATH TO postgres_exporter,pg_catalog;
-- If deploying as non-superuser (for example in AWS RDS), uncomment the GRANT -- If deploying as non-superuser (for example in AWS RDS), uncomment the GRANT
@ -187,7 +207,7 @@ ALTER USER postgres_exporter SET SEARCH_PATH TO postgres_exporter,pg_catalog;
CREATE SCHEMA IF NOT EXISTS postgres_exporter; CREATE SCHEMA IF NOT EXISTS postgres_exporter;
GRANT USAGE ON SCHEMA postgres_exporter TO postgres_exporter; GRANT USAGE ON SCHEMA postgres_exporter TO postgres_exporter;
CREATE FUNCTION get_pg_stat_activity() RETURNS SETOF pg_stat_activity AS CREATE OR REPLACE FUNCTION get_pg_stat_activity() RETURNS SETOF pg_stat_activity AS
$$ SELECT * FROM pg_catalog.pg_stat_activity; $$ $$ SELECT * FROM pg_catalog.pg_stat_activity; $$
LANGUAGE sql LANGUAGE sql
VOLATILE VOLATILE