PG-patroni+etcd switchover测试

手工切换(switchover)

# switchover
patronictl -d etcd://pg1:2379 switchover etcd-cluster-pg

patronictl -c /etc/patroni/patroni.yml switchover

# 检查
patronictl -c /etc/patroni/patroni.yml list

切换过程输出

[postgres@pg1 ~]$ patronictl -c /etc/patroni/patroni.yml switchover
Master [pgsql12_pg1]: pgsql12_pg1
Candidate ['pgsql12_pg2', 'pgsql12_pg3'] []: pgsql12_pg2
When should the switchover take place (e.g. 2020-08-01T11:42 )  [now]: now
Current cluster topology
+ Cluster: etcd-cluster-pg (6855142739579764998) ------+----+-----------+
|    Member   |         Host        |  Role  |  State  | TL | Lag in MB |
+-------------+---------------------+--------+---------+----+-----------+
| pgsql12_pg1 | 192.168.10.190:2020 | Leader | running |  8 |           |
| pgsql12_pg2 | 192.168.10.191:2020 |        | running |  8 |         0 |
| pgsql12_pg3 | 192.168.10.192:2020 |        | running |  8 |         0 |
+-------------+---------------------+--------+---------+----+-----------+
Are you sure you want to switchover cluster etcd-cluster-pg, demoting current master pgsql12_pg1? [y/N]: y
2020-08-01 10:42:35.06026 Successfully switched over to "pgsql12_pg2"
+ Cluster: etcd-cluster-pg (6855142739579764998) ------+----+-----------+
|    Member   |         Host        |  Role  |  State  | TL | Lag in MB |
+-------------+---------------------+--------+---------+----+-----------+
| pgsql12_pg1 | 192.168.10.190:2020 |        | stopped |    |   unknown |
| pgsql12_pg2 | 192.168.10.191:2020 | Leader | running |  8 |           |
| pgsql12_pg3 | 192.168.10.192:2020 |        | running |  8 |         0 |
+-------------+---------------------+--------+---------+----+-----------+

检查

最后集群状态：

总结

主库切换完成后，所有从库都成功指向新主。