diff --git a/testgres/node.py b/testgres/node.py
index 9978dcf6..b597dd69 100644
--- a/testgres/node.py
+++ b/testgres/node.py
@@ -683,7 +683,6 @@ def reload(self, params=[]):
_params = [
get_bin_path("pg_ctl"),
"-D", self.data_dir,
- "-w", # wait
"reload"
] + params # yapf: disable
@@ -691,6 +690,43 @@ def reload(self, params=[]):
return self
+ def promote(self, dbname=None, username=None):
+ """
+ Promote standby instance to master using pg_ctl. For PostgreSQL versions
+ below 10 some additional actions required to ensure that instance
+ became writable and hence `dbname` and `username` parameters may be
+ needed.
+
+ Returns:
+ This instance of :class:`.PostgresNode`.
+ """
+
+ _params = [
+ get_bin_path("pg_ctl"),
+ "-D", self.data_dir,
+ "-w", # wait
+ "promote"
+ ] # yapf: disable
+
+ execute_utility(_params, self.utils_log_file)
+
+ # for versions below 10 `promote` is asynchronous so we need to wait
+ # until it actually becomes writable
+ if self._pg_version < '10':
+ check_query = "SELECT pg_is_in_recovery()"
+
+ self.poll_query_until(
+ query=check_query,
+ expected=False,
+ dbname=dbname,
+ username=username,
+ max_attempts=0) # infinite
+
+ # node becomes master itself
+ self._master = None
+
+ return self
+
def pg_ctl(self, params):
"""
Invoke pg_ctl with params.
diff --git a/tests/test_simple.py b/tests/test_simple.py
index 230cff47..91348f34 100755
--- a/tests/test_simple.py
+++ b/tests/test_simple.py
@@ -529,6 +529,20 @@ def test_incorrect_catchup(self):
with self.assertRaises(TestgresException):
node.catchup()
+ def test_promotion(self):
+ with get_new_node() as master:
+ master.init().start()
+ master.safe_psql('create table abc(id serial)')
+
+ with master.replicate().start() as replica:
+ master.stop()
+ replica.promote()
+
+ # make standby becomes writable master
+ replica.safe_psql('insert into abc values (1)')
+ res = replica.safe_psql('select * from abc')
+ self.assertEqual(res, b'1\n')
+
def test_dump(self):
query_create = 'create table test as select generate_series(1, 2) as val'
query_select = 'select * from test order by val asc'
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