高可用演练

alias pt='patronictl -c /pg/bin/patroni.yml'

alias pt-up='sudo systemctl start patroni'     # 启动Patroni
alias pt-dw='sudo systemctl stop  patroni'     # 停止Patroni
alias pt-st='systemctl status patroni'         # 汇报Patroni抓昂泰
alias pt-ps='ps aux | grep patroni'            # 查看Patroni进程
alias pt-log='tail -f /pg/log/patroni.log'     # 监控Patroni日志

$ pt --help
Usage: patronictl [OPTIONS] COMMAND [ARGS]...

Options:
  -c, --config-file TEXT  Configuration file
  -d, --dcs TEXT          Use this DCS
  -k, --insecure          Allow connections to SSL sites without certs
  --help                  Show this message and exit.

Commands:
  configure    Create configuration file
  dsn          Generate a dsn for the provided member,...
  edit-config  Edit cluster configuration
  failover     Failover to a replica
  flush        Discard scheduled events
  history      Show the history of failovers/switchovers
  list         List the Patroni members for a given Patroni
  pause        Disable auto failover
  query        Query a Patroni PostgreSQL member
  reinit       Reinitialize cluster member
  reload       Reload cluster member configuration
  remove       Remove cluster from DCS
  restart      Restart cluster member
  resume       Resume auto failover
  scaffold     Create a structure for the cluster in DCS
  show-config  Show cluster configuration
  switchover   Switchover to a replica
  topology     Prints ASCII topology for given cluster
  version      Output version of patronictl command or a...

# run as postgres @ any member of cluster `pg-test`
$ pt failover
Candidate ['pg-test-2', 'pg-test-3'] []: pg-test-3
Current cluster topology
+ Cluster: pg-test (6886641621295638555) -----+----+-----------+-----------------+
| Member    | Host        | Role    | State   | TL | Lag in MB | Tags            |
+-----------+-------------+---------+---------+----+-----------+-----------------+
| pg-test-1 | 10.10.10.11 | Leader  | running |  1 |           | clonefrom: true |
| pg-test-2 | 10.10.10.12 | Replica | running |  1 |         0 | clonefrom: true |
| pg-test-3 | 10.10.10.13 | Replica | running |  1 |         0 | clonefrom: true |
+-----------+-------------+---------+---------+----+-----------+-----------------+
Are you sure you want to failover cluster pg-test, demoting current master pg-test-1? [y/N]: y
+ Cluster: pg-test (6886641621295638555) -----+----+-----------+-----------------+
| Member    | Host        | Role    | State   | TL | Lag in MB | Tags            |
+-----------+-------------+---------+---------+----+-----------+-----------------+
| pg-test-1 | 10.10.10.11 | Replica | running |  2 |         0 | clonefrom: true |
| pg-test-2 | 10.10.10.12 | Replica | running |  2 |         0 | clonefrom: true |
| pg-test-3 | 10.10.10.13 | Leader  | running |  2 |           | clonefrom: true |
+-----------+-------------+---------+---------+----+-----------+-----------------+