Patroni
Posted PostgreSQLChina
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作者：王志斌
前言
Patroni作为PG开箱即用的高可用解决方案，尤其在云端环境常作为首选，本文主要介绍如何部署Patroni集群，其特点归纳如下：
- 易用性：模板化部署
- 可用性：分布式一致性软件提供强一致性
- 健壮性：提供多个复制集群
- 便捷性：手工自动切换
- 自治性：自动故障转移
- 可靠性：watchdog机制
当然Patroni还可以和其他开源组件结合使用，如Pgbouncer（连接池）、Pgbackrest（远端备份）、Promethues+grafana+altermanager（监控告警）等等。
基本配置
图 1 Patroni集群架构示意图
如上图所示，主集群包括三台服务器，备用集群包括一台服务器，通过同步流复制，与主集群进行数据同步，下面将详细介绍环境部署及操作流程。
硬件环境要求
需要虚拟机四台，其中三台组件Leader cluster，另外一台建立standby cluster
软件环境要求
需要安装如下软件：
操作系统版本：CentOS Linux release 7.7.1908 (Core)
python版本：2.7.5
- 系统依赖
yum -y install gcc etcd haproxy libyaml
yum -y install epel-release
yum -y install python-pip
yum -y install python-devel
- 软件依赖
pip install --upgrade pip
pip install psycopg2==2.5.4
pip install --upgrade setuptools
pip install -r requirements.txt
环境配置
配置环境变量
分别在三台集群上设置环境变量
export PATH=$PATH:/home/postgres/database/bin
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/home/postgres/database/lib
export ETCDCTL_API=3
配置Etcd服务
- 192.168.137.101
vim /etc/etcd/etcd.conf
ETCD_NAME=zwetcd_1
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="http://192.168.137.101:2380"
ETCD_LISTEN_CLIENT_URLS="http://192.168.137.101:2379,http://127.0.0.1:2379"
#[cluster]
ETCD_INITIAL_ADVERTISE_PEER_URLS="http://192.168.137.101:2380"
ETCD_INITIAL_CLUSTER="zwetcd_1=http://192.168.137.101:2380,zwetcd_2=http://192.168.137.103:2380,zwetcd_3=http://192.168.137.104:2380"
ETCD_INITIAL_CLUSTER_STATE="new"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_ADVERTISE_CLIENT_URLS="http://192.168.137.101:2379"
- 192.168.137.103
vim /etc/etcd/etcd.conf
ETCD_NAME=zwetcd_2
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="http://192.168.137.103:2380"
ETCD_LISTEN_CLIENT_URLS="http://192.168.137.103:2379,http://127.0.0.1:2379"
#[cluster]
ETCD_INITIAL_ADVERTISE_PEER_URLS="http://192.168.137.103:2380"
ETCD_INITIAL_CLUSTER="zwetcd_1=http://192.168.137.101:2380,zwetcd_2=http://192.168.137.103:2380,zwetcd_3=http://192.168.137.104:2380"
ETCD_INITIAL_CLUSTER_STATE="new"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_ADVERTISE_CLIENT_URLS="http://192.168.137.103:2379"
- 192.168.137.104
vim /etc/etcd/etcd.conf
ETCD_NAME=zwetcd_3
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="http://192.168.137.104:2380"
ETCD_LISTEN_CLIENT_URLS="http://192.168.137.104:2379,http://127.0.0.1:2379"
#[cluster]
ETCD_INITIAL_ADVERTISE_PEER_URLS="http://192.168.137.104:2380"
ETCD_INITIAL_CLUSTER="zwetcd_1=http://192.168.137.101:2380,zwetcd_2=http://192.168.137.103:2380,zwetcd_3=http://192.168.137.104:2380"
ETCD_INITIAL_CLUSTER_STATE="new"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_ADVERTISE_CLIENT_URLS="http://192.168.137.104:2379"
配置HAPROXY
vi /etc/haproxy/haproxy.cfg
#proxy web监控，查看统计信息
listen status
bind 0.0.0.0:1080
mode http
log global
stats enable
# stats是haproxy的一个统计页面的套接字，该参数设置统计页面的刷新间隔为30s
stats refresh 30s
stats uri /haproxy-stats
# 设置统计页面认证时的提示内容
stats realm Private lands
# 设置统计页面认证的用户和密码，如果要设置多个，另起一行写入即可
stats auth admin:passw0rd
# 隐藏统计页面上的haproxy版本信息
# stats hide-version
#---------------------------------------------------------------------
listen master
bind *:5000
mode tcp
option tcplog
balance roundrobin
option httpchk OPTIONS /master
http-check expect status 200
default-server inter 3s fall 3 rise 2 on-marked-down shutdown-sessions
server node1 192.168.137.101:5432 maxconn 1000 check port 8008 inter 5000 rise 2 fall 2
server node2 192.168.137.103:5432 maxconn 1000 check port 8008 inter 5000 rise 2 fall 2
server node3 192.168.137.104:5432 maxconn 1000 check port 8008 inter 5000 rise 2 fall 2
listen replicas
bind *:5001
mode tcp
option tcplog
balance roundrobin
option httpchk OPTIONS /replica
http-check expect status 200
default-server inter 3s fall 3 rise 2 on-marked-down shutdown-sessions
server node1 192.168.137.101:5432 maxconn 1000 check port 8008 inter 5000 rise 2 fall 2
server node2 192.168.137.103:5432 maxconn 1000 check port 8008 inter 5000 rise 2 fall 2
server node3 192.168.137.104:5432 maxconn 1000 check port 8008 inter 5000 rise 2 fall 2
并设置selinux权限
setsebool -P haproxy_connect_any=1
配置文件
postgres0.yml
scope: pgcluster
name: postgresql0
restapi:
listen: 192.168.137.101:8008
connect_address: 192.168.137.101:8008
etcd:
host: 192.168.137.101:2379
bootstrap:
dcs:
ttl: 30
loop_wait: 10
retry_timeout: 10
maximum_lag_on_failover: 1048576
postgresql:
use_pg_rewind: true
parameters:
initdb:
- encoding: UTF8
- data-checksums
pg_hba:
- host replication replicator 192.168.137.0/24 md5
- host all all 0.0.0.0/0 md5
users:
admin:
password: admin
options:
- createrole
- createdb
postgresql:
listen: 192.168.137.101:5432
connect_address: 192.168.137.101:5432
data_dir: /home/postgres/database/data
pgpass: /tmp/pgpass
authentication:
replication:
username: replicator
password: rep-pass
superuser:
username: postgres
password: zalando
rewind: # Has no effect on postgres 10 and lower
username: rewind_user
password: rewind_password
parameters:
unix_socket_directories: '.'
wal_level: hot_standby
tags:
nofailover: false
noloadbalance: false
clonefrom: false
nosync: false
postgres1.yml
scope: pgcluster
name: postgresql1
restapi:
listen: 192.168.137.103:8008
connect_address: 192.168.137.103:8008
etcd:
host: 192.168.137.103:2379
bootstrap:
dcs:
ttl: 30
loop_wait: 10
retry_timeout: 10
maximum_lag_on_failover: 1048576
postgresql:
use_pg_rewind: true
parameters:
initdb:
- encoding: UTF8
- data-checksums
pg_hba:
- host replication replicator 192.168.137.0/24 md5
- host all all 0.0.0.0/0 md5
users:
admin:
password: admin
options:
- createrole
- createdb
postgresql:
listen: 192.168.137.103:5432
connect_address: 192.168.137.103:5432
data_dir: /home/postgres/database/data
pgpass: /tmp/pgpass
authentication:
replication:
username: replicator
password: rep-pass
superuser:
username: postgres
password: zalando
rewind: # Has no effect on postgres 10 and lower
username: rewind_user
password: rewind_password
parameters:
unix_socket_directories: '.'
wal_level: hot_standby
basebackup:
- verbose
- max-rate: 100M
tags:
nofailover: false
noloadbalance: false
clonefrom: false
postgres2.yml
scope: pgcluster
name: postgresql2
restapi:
listen: 192.168.137.104:8008
connect_address: 192.168.137.104:8008
etcd:
host: 192.168.137.104:2379
bootstrap:
dcs:
ttl: 30
loop_wait: 10
retry_timeout: 10
maximum_lag_on_failover: 1048576
postgresql:
use_pg_rewind: true
parameters:
initdb:
- encoding: UTF8
- data-checksums
pg_hba:
- host replication replicator 192.168.137.0/24 md5
- host all all 0.0.0.0/0 md5
users:
admin:
password: admin
options:
- createrole
- createdb
postgresql:
listen: 192.168.137.104:5432
connect_address: 192.168.137.104:5432
data_dir: /home/postgres/database/data
pgpass: /tmp/pgpass
authentication:
replication:
username: replicator
password: rep-pass
superuser:
username: postgres
password: zalando
rewind: # Has no effect on postgres 10 and lower
username: rewind_user
password: rewind_password
parameters:
unix_socket_directories: '.'
wal_level: hot_standby
basebackup:
- verbose
- max-rate: 100M
tags:
nofailover: false
noloadbalance: false
clonefrom: false
standby.yml
scope: standby
namespace: /service/
name: pgsql10_node1
restapi:
listen: 192.168.137.105:8008
connect_address: 192.168.137.105:8008
etcd:
host: 192.168.137.101:2379
bootstrap:
dcs:
standby_cluster:
host: 192.168.137.101
port: 5432
create_replica_methods:
- basebackup
initdb:
- encoding: UTF8
- data-checksums
pg_hba:
- host replication replicator 192.168.137.0/24 md5
- host all all 0.0.0.0/0 md5
users:
admin:
password: admin
options:
- createrole
- createdb
postgresql:
listen: 192.168.137.105:5432
connect_address: 192.168.137.105:5432
bin_dir: /home/postgres/database/bin
data_dir: /home/postgres/database/data
pgpass: /home/postgres/.pgpass
authentication:
replication:
username: replicator
password: rep-pass
superuser:
username: postgres
password: zalando
parameters:
wal_level: hot_standby
hot_standby: on
create_replica_methods:
- basebackup
basebackup:
max-rate: '100M'
tags:
nofailover: false
noloadbalance: false
clonefrom: false
nosync: false
启动服务
关闭防火墙
Systemctl stop firewalld
Systemctl disable firewalld
启动patroni
- 192.168.137.101
python patroni.py postgres0.yml
- 192.168.137.103
python patroni.py postgres1.yml
- 192.168.137.104
python patroni.py postgres2.yml
启动etcd服务
分别在三台集群，启动etcd服务。
systemctl start etcd
查看etcd状态
etcdctl --write-out=table --endpoints=192.168.137.101:2379,192.168.137.103:2379,192.168.137.104:2379 endpoint status
也可以执行etcdctl --endpoints=http://192.168.137.101:2379 member list -w table
查看patroni状态
在任意一台机器，执行如下命令：
例如在192.168.137.101上执行，查看主机群状态，其配置文件为postgres0.yml
python patronictl.py -c postgres0.yml list
在备用主机上查看备用集群状态
执行命令如下：python patronictl.py -c standby.yml list
启动Haproxy
systemctl start haproxy
访问Haproxy
访问地址http://192.168.137.101:1080/haproxy-stats
用户名：admin
密码：passw0rd
验证操作步骤
查看级联集群
[postgres@localhost patroni]$ python patronictl.py -d etcd://192.168.137.101:2379 list standby
+ Cluster: standby (6903439046292649568) ------+---------+----+-----------+
| Member | Host | Role | State | TL | Lag in MB |
+---------------+-----------------+----------------+---------+----+-----------+
| pgsql10_node1 | 192.168.137.105 | Standby Leader | running | 1 | |
+---------------+-----------------+----------------+---------+----+-----------+
数据读写
通过任意一台主机( centos1,centos2,centos3)访问数据库
尝试向主库(Primary)写数据，并读取数据：
psql -U postgres -d postgres -p 5432 -h centos1
postgres=# create table test (id int, name varchar(100));
CREATE TABLE
postgres=# insert into test values ( 1,'1');
INSERT 0 1
postgres=# select * from test;
id | name
----+------
1 | 1
(1 row)
尝试向一个从库(Standby)写数据
psql -U postgres -d postgres -p 5432 -h centos2
postgres=# insert into test values ( 1,'1');
ERROR：cannot execute INSERT in a read-only transaction
尝试从一个从库(Standby)读数据
psql -U postgres -d postgres -p 5432 -h centos3
postgres=# select * from test;
id | name
----+------
1 | 1
(1 row)
自动切换(failover)
Kill主库(Primary)上的postmater进程，Kill之前的状态信息：
主库是postgresql0/centos1
[root@centos1 patroni]# python patronictl.py -d etcd://centos1:2379 list pgcluster
+ Cluster: pgcluster (6904097497199745789) --+---------+----+-----------+
| Member | Host | Role | State | TL | Lag in MB |
+-------------+-----------------+---------+---------+----+-----------+
| postgresql0 | 192.168.137.101 | Leader | running | 1 | |
| postgresql1 | 192.168.137.103 | Replica | running | 1 | 0.0 |
| postgresql2 | 192.168.137.104 | Replica | running | 1 | 0.0 |
+-------------+-----------------+---------+---------+----+-----------+
在centos1上执行Kill
[root@centos1 patroni]$ ps -ef|grep postgres
postgres 2793 2329 0 11:44 pts/0 00:00:02 python patroni.py postgres0.yml
postgres 2847 1 0 11:44 ? 00:00:00 postgres -D /home/postgres/database/data --config-file=/home/postgres/database/data/postgresql.conf --listen_addresses=192.168.137.101 --max_worker_processes=8 --max_prepared_transactions=0 --wal_level=hot_standby --track_commit_timestamp=off --max_locks_per_transaction=64 --port=5432 --max_replication_slots=10 --max_connections=100 --hot_standby=on --cluster_name=pgcluster --wal_log_hints=on --max_wal_senders=10
postgres 2850 2847 0 11:44 ? 00:00:00 postgres: pgcluster: checkpointer process
postgres 2851 2847 0 11:44 ? 00:00:00 postgres: pgcluster: writer process
postgres 2852 2847 0 11:44 ? 00:00:00 postgres: pgcluster: wal writer process
postgres 2853 2847 0 11:44 ? 00:00:00 postgres: pgcluster: autovacuum launcher process
postgres 2854 2847 0 11:44 ? 00:00:00 postgres: pgcluster: stats collector process
postgres 2859 2847 0 11:44 ? 00:00:00 postgres: pgcluster: postgres postgres 192.168.137.101(49866) idle
postgres 2873 2847 0 11:44 ? 00:00:00 postgres: pgcluster: wal sender process replicator 192.168.137.104(45866) streaming 0/4015AE8
postgres 2874 2847 0 11:44 ? 00:00:00 postgres: pgcluster: wal sender process replicator 192.168.137.103(58798) streaming 0/4015AE8
[root@centos1 patroni]# kill -9 2847
[root@centos1 patroni]#
在centos1上，Patroni再次启动postgresql0，postgresql0依然是主库，没有切换
[root@centos1 patroni]# python patronictl.py -d etcd://centos1:2379 list pgcluster
+ Cluster: pgcluster (6904097497199745789) --+---------+----+-----------+
| Member | Host | Role | State | TL | Lag in MB |
+-------------+-----------------+---------+---------+----+-----------+
| postgresql0 | 192.168.137.101 | Leader | running | 2 | |
| postgresql1 | 192.168.137.103 | Replica | running | 2 | 0.0 |
| postgresql2 | 192.168.137.104 | Replica | running | 2 | 0.0 |
+-------------+-----------------+---------+---------+----+-----------+
查看主库上的PID, 所有进程都是新的PID：
[root@centos1 patroni]# ps -ef|grep postgres
postgres 2793 2329 0 11:44 pts/0 00:00:03 python patroni.py postgres0.yml
postgres 3057 1 0 11:59 ? 00:00:00 postgres -D /home/postgres/database/data --config-file=/home/postgres/database/data/postgresql.conf --listen_addresses=192.168.137.101 --max_worker_processes=8 --max_prepared_transactions=0 --wal_level=hot_standby --track_commit_timestamp=off --max_locks_per_transaction=64 --port=5432 --max_replication_slots=10 --max_connections=100 --hot_standby=on --cluster_name=pgcluster --wal_log_hints=on --max_wal_senders=10
postgres 3060 3057 0 11:59 ? 00:00:00 postgres: pgcluster: checkpointer process
postgres 3061 3057 0 11:59 ? 00:00:00 postgres: pgcluster: writer process
postgres 3062 3057 0 11:59 ? 00:00:00 postgres: pgcluster: stats collector process
postgres 3067 3057 0 11:59 ? 00:00:00 postgres: pgcluster: postgres postgres 192.168.137.101(50820) idle
postgres 3072 3057 0 11:59 ? 00:00:00 postgres: pgcluster: wal sender process replicator 192.168.137.103(59732) streaming 0/4015D80
postgres 3073 3057 0 11:59 ? 00:00:00 postgres: pgcluster: wal sender process replicator 192.168.137.104(46798) streaming 0/4015D80
postgres 3074 3057 0 11:59 ? 00:00:00 postgres: pgcluster: wal writer process
postgres 3075 3057 0 11:59 ? 00:00:00 postgres: pgcluster: autovacuum launcher process
root 3151 2410 0 12:01 pts/1 00:00:00 grep --color=auto postgres
查看集群信息， postgresql0是主库，正常工作
[root@centos1 patroni]# python patronictl.py -d etcd://centos1:2379 list pgcluster
+ Cluster: pgcluster (6904097497199745789) --+---------+----+-----------+
| Member | Host | Role | State | TL | Lag in MB |
+-------------+-----------------+---------+---------+----+-----------+
| postgresql0 | 192.168.137.101 | Leader | running | 2 | |
| postgresql1 | 192.168.137.103 | Replica | running | 2 | 0.0 |
| postgresql2 | 192.168.137.104 | Replica | running | 2 | 0.0 |
+-------------+-----------------+---------+---------+----+-----------+
手工切换(switchover)
切换之前的状态信息
[root@centos1 patroni]# python patronictl.py -d etcd://centos1:2379 list pgcluster
+ Cluster: pgcluster (6904097497199745789) --+---------+----+-----------+
| Member | Host | Role | State | TL | Lag in MB |
+-------------+-----------------+---------+---------+----+-----------+
| postgresql0 | 192.168.137.101 | Leader | running | 2 | |
| postgresql1 | 192.168.137.103 | Replica | running | 2 | 0.0 |
| postgresql2 | 192.168.137.104 | Replica | running | 2 | 0.0 |
+-------------+-----------------+---------+---------+----+-----------+
执行手工切换(switchover)
当前的主(Primary)是: postgresql0/centos1
选择新的主(Primary): postgresql2/centos3
[root@centos1 patroni]# python patronictl.py -d etcd://centos1:2379 switchover pgcluster
Master [postgresql0]:
Candidate ['postgresql1', 'postgresql2'] []: postgresql2
When should the switchover take place (e.g. 2020-12-09T13:05 ) [now]:
Current cluster topology
+ Cluster: pgcluster (6904097497199745789) --+---------+----+-----------+
| Member | Host | Role | State | TL | Lag in MB |
+-------------+-----------------+---------+---------+----+-----------+
| postgresql0 | 192.168.137.101 | Leader | running | 2 | |
| postgresql1 | 192.168.137.103 | Replica | running | 2 | 0.0 |
| postgresql2 | 192.168.137.104 | Replica | running | 2 | 0.0 |
+-------------+-----------------+---------+---------+----+-----------+
Are you sure you want to switchover cluster pgcluster, demoting current master postgresql0? [y/N]: y
2020-12-09 12:05:38.44586 Successfully switched over to "postgresql2"
+ Cluster: pgcluster (6904097497199745789) --+---------+----+-----------+
| Member | Host | Role | State | TL | Lag in MB |
+-------------+-----------------+---------+---------+----+-----------+
| postgresql0 | 192.168.137.101 | Replica | stopped | | unknown |
| postgresql1 | 192.168.137.103 | Replica | running | 2 | 0.0 |
| postgresql2 | 192.168.137.104 | Leader | running | 2 | |
+-------------+-----------------+---------+---------+----+-----------+
持续查看集群状态信息：
新的主库(Primary)是：postgresql2/centos3
Patroni重新启动了postgresql0/centos1
最后, postgresql0/centos1 作为从库(Standby)重新加入集群，正常工作
[root@centos1 patroni]# python patronictl.py -d etcd://centos1:2379 list pgcluster
+ Cluster: pgcluster (6904097497199745789) --+---------+----+-----------+
| Member | Host | Role | State | TL | Lag in MB |
+-------------+-----------------+---------+---------+----+-----------+
| postgresql0 | 192.168.137.101 | Replica | running | 3 | 0.0 |
| postgresql1 | 192.168.137.103 | Replica | running | 3 | 0.0 |
| postgresql2 | 192.168.137.104 | Leader | running | 3 | |
+-------------+-----------------+---------+---------+----+-----------+
重新启动主库(Primay)
重新启动之前的集群信息
[root@centos1 patroni]# python patronictl.py -d etcd://centos1:2379 list pgcluster
+ Cluster: pgcluster (6904097497199745789) --+---------+----+-----------+
| Member | Host | Role | State | TL | Lag in MB |
+-------------+-----------------+---------+---------+----+-----------+
| postgresql0 | 192.168.137.101 | Replica | running | 3 | 0.0 |
| postgresql1 | 192.168.137.103 | Replica | running | 3 | 0.0 |
| postgresql2 | 192.168.137.104 | Leader | running | 3 | |
+-------------+-----------------+---------+---------+----+-----------+
重启动centos3(Primary database)
[root@centos3 ~]# reboot
Connection to centos3 closed by remote host.
Connection to centos3 closed.
查看集群状态信息
Postgresql2/centos3停止了
Postgresql0/centos1成为了主库(Primary)
[root@centos1 patroni]# python patronictl.py -d etcd://centos1:2379 list pgcluster
+ Cluster: pgcluster (6904097497199745789) --+---------+----+-----------+
| Member | Host | Role | State | TL | Lag in MB |
+-------------+-----------------+---------+---------+----+-----------+
| postgresql0 | 192.168.137.101 | Leader | running | 4 | |
| postgresql1 | 192.168.137.103 | Replica | running | | unknown |
| postgresql2 | 192.168.137.104 | Replica | stopped | | unknown |
+-------------+-----------------+---------+---------+----+-----------+
[root@centos1 patroni]# python patronictl.py -d etcd://centos1:2379 list pgcluster
+ Cluster: pgcluster (6904097497199745789) --+---------+----+-----------+
| Member | Host | Role | State | TL | Lag in MB |
+-------------+-----------------+---------+---------+----+-----------+
| postgresql0 | 192.168.137.101 | Leader | running | 4 | |
| postgresql1 | 192.168.137.103 | Replica | running | 4 | 0.0 |
+-------------+-----------------+---------+---------+----+-----------+
当centos3启动后，手工启动etcd和postgresql2
[root@centos3 ~]# systemctl start etcd
[root@centos3 ~]# etcdctl --write-out=table --endpoints=192.168.137.101:2379,192.168.137.103:2379,192.168.137.104:2379 endpoint status
+----------------------+------------------+---------+---------+-----------+-----------+------------+
| ENDPOINT | ID | VERSION | DB SIZE | IS LEADER | RAFT TERM | RAFT INDEX |
+----------------------+------------------+---------+---------+-----------+-----------+------------+
| 192.168.137.101:2379 | 38d2ef078eac1ceb | 3.3.11 | 20 kB | false | 6 | 4474 |
| 192.168.137.103:2379 | 1ba6a8d4bb29c08f | 3.3.11 | 20 kB | true | 6 | 4474 |
| 192.168.137.104:2379 | 16f89451865a3f1f | 3.3.11 | 20 kB | false | 6 | 4474 |
+----------------------+------------------+---------+---------+-----------+-----------+------------+
[postgres@centos3 patroni]$ python patroni.py postgres2.yml
当etcd/postgresql2启动后，查看集群状态信息
Postgresql2/centos3成为从库(Standby)，正常工作
[root@centos1 patroni]# python patronictl.py -d etcd://centos1:2379 list pgcluster
+ Cluster: pgcluster (6904097497199745789) --+---------+----+-----------+
| Member | Host | Role | State | TL | Lag in MB |
+-------------+-----------------+---------+---------+----+-----------+
| postgresql0 | 192.168.137.101 | Leader | running | 4 | 以上是关于Patroni的主要内容，如果未能解决你的问题，请参考以下文章
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