使用edit-config

bash-4.2$ patronictl -c /etc/patroni/patroni.yml edit-config
loop_wait: 10
master_start_timeout: 300
maximum_lag_on_failover: 1048576
postgresql:
  parameters:
    hot_standby: 'on'
    listen_addresses: 0.0.0.0
    max_connections: 500　　//預設值為100，這裡加到500
    max_replication_slots: 10
    max_wal_senders: 
 
10
    port: 5432
    wal_keep_segments: 100
    wal_level: logical
    wal_log_hints: 'on'
  use_pg_rewind: true
  use_slots: true
retry_timeout: 10
synchronous_mode: false
ttl: 30

儲存

--- 
+++ 
@@ -3,6 +3,7 @@
 maximum_lag_on_failover: 1048576
 postgresql:
   parameters:
+    max_connections: 500
     hot_standby: 
 
'on'
     listen_addresses: 0.0.0.0
     max_replication_slots: 10

Apply these changes? [y/N]: y
Configuration changed

檢視叢集

bash-4.2$ patronictl -c /etc/patroni/patroni.yml list
+--------+---------------------+---------+---------+----+-----------+-----------------+
| Member | Host                | Role    | State   | TL | Lag in
 
 MB | Pending restart |
+ Cluster: pgsql (7042477957214539800) --+---------+----+-----------+-----------------+
| pg1    | 192.168.1.50:5432 | Replica | running |  2 |         0 | *               |
| pg2    | 192.168.1.51:5432 | Leader  | running |  2 |           | *               |
| pg3    | 192.168.1.52:5432 | Replica | running |  2 |         0 | *               |
+--------+---------------------+---------+---------+----+-----------+-----------------+

Pending restart 列裡有*號的都需要重啟才生效

重啟完再次檢視

bash-4.2$ patronictl -c /etc/patroni/patroni.yml list
+--------+---------------------+---------+---------+----+-----------+
| Member | Host                | Role    | State   | TL | Lag in MB |
+ Cluster: pgsql (7042477957214539800) --+---------+----+-----------+
| pg1    | 192.168.1.50:5432 | Replica | running |  2 |         0 |
| pg2    | 192.168.1.51:5432 | Leader  | running |  2 |           |
| pg3    | 192.168.1.52:5432 | Replica | running |  2 |         0 |
+--------+---------------------+---------+---------+----+-----------+