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export PATRONICTL_CONFIG_FILE=/etc/patroni/patroni_postgresql.yml
# configfile Patroni may also read the configuration from the
PATRONI_CONFIGURATION environment variable
# 可以查看命令的使用说明
patronictl --help
# 查看版本号
patronictl -c /etc/patroni.yml version
# 查看所有成员信息
patronictl -c /etc/patroni.yml list
# 重新加载配置
patronictl -c /etc/patroni.yml reload
# 移除集群,重新配置的时候使用
patronictl -c /etc/patroni.yml remove postgres
# 重启数据库集群
patronictl -c /etc/patroni.yml restart postgres
# 切换 Leader,将一个 slave 切换成 leader。
patronictl -c /etc/patroni.yml switchover
#查看历史failovers/switchovers
patronictl -c /etc/patroni/patroni_postgresql.yml history
#默认配置文件位置:
#patronictl configure
#Configuration file [/root/.config/patroni/patronictl.yaml]:
/root/.config/patroni/patronictl.yaml
[root@db03 patroni]# cp /etc/patroni/patroni_postgresql.yml ./patronictl.yaml
[root@db03 patroni]# patronictl list
+--------+---------------+---------+---------+----+-----------+
| Member | Host | Role | State | TL | Lag in MB |
+ Cluster: pgha (7025507499523621070) -------+----+-----------+
| node1 | 192.168.5.201 | Replica | running | 6 | 0 |
| node2 | 192.168.5.202 | Replica | running | 6 | 0 |
| node3 | 192.168.5.203 | Leader | running | 6 | |
+--------+---------------+---------+---------+----+-----------+
故障位置
故障场景
patroni动作
备库
PG备库停止
拉起PG备库服务
备库
正常停止备库patroni
停止PG备库
备库
备库patroni异常停止
无动作
备库
备库无法连接ETCD
无动作
备库
非leader角色但PG处于生产模式
重启PG并切换到恢复模式作为备库
备库
备库主机重启
patroni启动拉起PG备库
主库
PG主库停止
启动PG,如果启动时间超过master_start_timeout,进行主备切换
主库
正常停止主库patroni
关闭主库,从备库中选举新主库
主库
主库patroni异常停止
看门狗重启主机,启动后如果拿到Leader锁,主备不切换,否则选举新主,切换主备
主库
主库无法连接ETCD
主库降级为备库,触发故障转移
-
ETCD故障
主库降级,集群中全部备库
-
同步模式下,无可用同步备库
临时切换为异步模式,在恢复同步模式之前自动故障转移不可用
官网连接
https://patroni.readthedocs.io/en/latest/dynamic_configuration.html
https://patroni.readthedocs.io/en/latest/
常用命令:
patronictl -c /etc/patroni/patroni_postgresql.yml list
patronictl -c /etc/patroni/patroni_postgresql.yml show-config
patronictl -c /etc/patroni/patroni_postgresql.yml edit-config
patronictl -c /etc/patroni/patroni_postgresql.yml restart (集群名称) (node1)
patronictl -c /etc/patroni/patroni_postgresql.yml switchover
patronictl -c /etc/patroni/patroni_postgresql.yml reinit (集群名称) (node1)
PG:配置文件生效顺序:
1. load parameters from file postgresql.base.conf (or from a custom_conf file, if set)
2. load parameters from file postgresql.conf
3. load parameters from file postgresql.auto.conf
4. run-time parameter using -o –name=value
#https://patroni.readthedocs.io/en/latest/dynamic_configuration.html
编辑配置文件: //必须更改 DCS 中的共享配置,本地配置修改不生效(在一个节点执行即可)
patronictl -c /etc/patroni/patroni_postgresql.yml edit-config
重启数据库集群(三个节点都执行)
patronictl -c /usr/patroni/conf/patroni_postgresql.yml restart pgha(集群名称)
查询集群名称:
patronictl -c /etc/patroni/patroni_postgresql.yml list
+--------+---------------+---------+---------+----+-----------+-----------------+
| Member | Host | Role | State | TL | Lag in MB | Pending restart |
+ Cluster: pgha (7025507499523621070) -------+----+-----------+-----------------+
| node1 | 192.168.5.201 | Replica | running | 3 | 0 | |
| node2 | 192.168.5.202 | Replica | running | 3 | 0 | |
| node3 | 192.168.5.203 | Leader | running | 3 | | * |
+--------+---------------+---------+---------+----+-----------+-----------------+
查看配置文件:
[root@db03 patroni]# patronictl -c /etc/patroni/patroni_postgresql.yml show-config
loop_wait: 10
master_start_timeout: 300
maximum_lag_on_failover: 20485760
postgresql:
parameters:
hot_standby: 'on'
listen_addresses: '*'
max_connections: 150
max_replication_slots: 10
max_wal_senders: 10
max_wal_size: 1GB
port: 5432
wal_keep_segments: 1000
wal_level: logical
wal_log_hints: 'on'
use_pg_rewind: true
use_slots: false
retry_timeout: 10
ttl: 30
参考:
https://github.com/zalando/patroni
https://patroni.readthedocs.io/en/latest/
https://patroni.readthedocs.io/en/latest/ENVIRONMENT.html
https://github.com/zalando/patroni/blob/master/docs/replication_modes.rst
https://postgresconf.org/system/events/document/000/000/228/Patroni_tutorial_4x3-2.pdf
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