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Enhance and fix bugs in psql plugin 

1. Check Patronictl statuses
2. Don't error during node primary transitions
This commit is contained in:
Joshua Boniface 2023-12-07 11:14:16 -05:00
parent 9dbadfdd6e
commit e7f21b7058
1 changed files with 24 additions and 24 deletions
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48
health-daemon/plugins/psql
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@ -66,6 +66,8 @@ class MonitoringPluginScript(MonitoringPlugin):
# Run any imports first
from psycopg2 import connect
from json import loads as jloads
from daemon_lib.common import run_os_command
conn_api = None
cur_api = None
@ -77,7 +79,7 @@ class MonitoringPluginScript(MonitoringPlugin):
# Craft a message that can be used by the clients
message = "Successfully connected to PostgreSQL databases on localhost"
# Check the Metadata database (primary)
# Check the API database
try:
conn_api = connect(
host=self.this_node.name,
@ -99,35 +101,33 @@ class MonitoringPluginScript(MonitoringPlugin):
if conn_api is not None:
conn_api.close()
if health_delta == 0:
# Check the PowerDNS database (secondary)
try:
conn_pdns = connect(
host=self.this_node.name,
port=self.config["pdns_postgresql_port"],
dbname=self.config["pdns_postgresql_dbname"],
user=self.config["pdns_postgresql_user"],
password=self.config["pdns_postgresql_password"],
)
cur_pdns = conn_pdns.cursor()
cur_pdns.execute("""SELECT * FROM supermasters""")
data = cur_pdns.fetchone()
except Exception as e:
health_delta = 50
err = str(e).split('\n')[0]
message = f"Failed to connect to PostgreSQL database {self.config['pdns_postgresql_dbname']}: {err}"
finally:
if cur_pdns is not None:
cur_pdns.close()
if conn_pdns is not None:
conn_pdns.close()
# Check for Patroni status
_, stdout, _ = run_os_command("patronictl --config-file /etc/patroni/config.yml list --format json")
patronictl_status = jloads(stdout)
this_node_patronictl_status = [p for p in patronictl_status if p["Member"] == self.this_node.name][0]
if health_delta == 0 and not this_node_patronictl_status:
health_delta = 10
message = "Unable to determine Patroni PostgreSQL node state"
elif health_delta == 0 and this_node_patronictl_status["State"] != "running":
health_delta = 10
message = "Patroni PostgreSQL state us not running"
# Handle some exceptional cases
if health_delta > 0:
if self.this_node.coordinator_state in ["takeover", "relinquish"]:
# This scenario occurrs if this plugin run catches a node transitioning from primary to secondary coordinator
# We can ignore it.
health_delta = 0
message = "Patroni PostgreSQL error reported but currently transitioning coordinator state; ignoring."
# Set the health delta in our local PluginResult object
self.plugin_result.set_health_delta(health_delta)
# Set the message in our local PluginResult object
self.plugin_result.set_message(message)
# Return our local PluginResult object
return self.plugin_result