PostgreSQL pg_auto_failover 高可用 2：pg_auto_failover集群运维
PostgreSQL pg_auto_failover 高可用 1：pg_auto_failover集群搭建
PostgreSQL pg_auto_failover 高可用 2：pg_auto_failover集群运维
鉴于官方https://pg-auto-failover.readthedocs.io/en/main/operations.html有很多命令，并且有些命令笔者也没有弄清楚，这里仅列出部分命令。1， pg_auto_failover故障转移节点设置
通过pg_autoctl get formation settings查看集群参数设置
root@ubuntu11:~# pg_autoctl get formation settings
Context | Name | Setting | Value
----------+----------+---------------------------+------------------------------------
formation |default | number_sync_standbys | 0
primary | ubuntu12 | synchronous_standby_names | 'ANY 1 (pgautofailover_standby_60)'
node | ubuntu13 | candidate priority | 50
node | ubuntu12 | candidate priority | 50
node | ubuntu13 | replication quorum | true
node | ubuntu12 | replication quorum | true参数说明
number_sync_standbys：同步备库的数量
number_sync_standbys表示设置强同步节点的数量，如果为0的话，表示当从节点故障之后，主节点依旧可以支持读写，否则，如果可用的备用节点数量小于number_sync_standbys设置的个数的时候，主节点的写操作会被挂起。
number_sync_standbys的设置
pg_autoctl set formation number_sync_standbys 1
Replication quorum
此参数可设置为 true或 false，默认情况下为 true，表示有可能成为同步备库。如果设置为 false，表示使用异步复制。
Candidate Priority
该参数表示候选备库优先级，可以设为0 到100 间的任意值，缺省值是50。优先级越大，越容易备选择成为主库。如果设置为0，则不会选择该节点为新主库。
当备库候选优先级相同时，Monitor节点将选择LSN位置最高的的备库。如果各个备库的LSN位置相同，则随机选择一个备库。
实际测试中到一个有意思的问题，主备节点都正常的情况下
1，从pg_auto_failover的维度看，synchronous_standby_names 为 'ANY 1 (pgautofailover_standby_60)'
2，从postgresql实例的维度看，synchronous_commit = on，synchronous_standby_names=ANY 1 (pgautofailover_standby_60)
这意味着主备节点是同步复制。
但是当关闭备节点来模拟备节点故障的时候，发现synchronous_standby_names为'',此时再从主节点查询synchronous_standby_names，其值也变为''，意味着自动降级为异步复制。
select name,setting from pg_settings where name like '%synchronous_commit%';
name |setting|
------------------+-------+
synchronous_commit|on |
select name,setting from pg_settings where name like '%synchronous_standby_names%' ;
name |setting |
-------------------------+---------------------------------+
synchronous_standby_names|ANY 1 (pgautofailover_standby_60)|
如果想设置为强同步模式，通过pg_autoctl set formation number-sync-standbys 1设置，这时会发现，一主一备的模式是不支持的
2，pg_auto_failover故障转移监控参数设置
如下是pgautofailover故障转移相关的监控参数，参考https://pg-auto-failover.readthedocs.io/en/main/ref/configuration.html#configuration
select name, setting, unit, short_desc from pg_settings where name ~ 'pgautofailover.';
name |setting |unit|short_desc |
------------------------------------------------+--------+----+----------------------------------------------------------------------------------------------------+
pgautofailover.enable_sync_wal_log_threshold |16777216| |Don't enable synchronous replication until secondary xlog is within this many bytes of the primary's|
pgautofailover.health_check_max_retries |2 | |Maximum number of re-tries before marking a node as failed. |
pgautofailover.health_check_period |5000 |ms|Duration between each check (in milliseconds). |
pgautofailover.health_check_retry_delay |2000 |ms|Delay between consecutive retries. |
pgautofailover.health_check_timeout |5000 |ms|Connect timeout (in milliseconds). |
pgautofailover.node_considered_unhealthy_timeout|20000 |ms|Mark node unhealthy if last ping was over this long ago |
pgautofailover.primary_demote_timeout |30000 |ms|Give the primary this long to drain before promoting the secondary |
pgautofailover.promote_wal_log_threshold |16777216| |Don't promote secondary unless xlog is with this many bytes of the master |
pgautofailover.startup_grace_period |10000 |ms|Wait for at least this much time after startup before initiating a failover. |
3， pg_auto_failover主从切换
3.1 自动故障切换
通过重启主节点的pgautofailover服务来模拟故障，发现会备用节点自动切换为主节点，原主节点启动后作为备用节点加入集群。
root@ubuntu11:~#
root@ubuntu11:~# pg_autoctl show state
Name |Node | Host:Port | TLI: LSN | Connection | Reported State | Assigned State
---------+-------+---------------+----------------+--------------+---------------------+--------------------
ubuntu13 | 60 | ubuntu13:9300 | 9: 0/5039798 | read-only | secondary | secondary
ubuntu12 | 68 | ubuntu12:9300 | 9: 0/5039798 | read-write | primary | primary
root@ubuntu11:~#
root@ubuntu11:~#
root@ubuntu11:~# pg_autoctl show state
Name |Node | Host:Port | TLI: LSN | Connection | Reported State | Assigned State
---------+-------+---------------+----------------+--------------+---------------------+--------------------
ubuntu13 | 60 | ubuntu13:9300 |10: 0/5039960 | read-write | wait_primary | wait_primary
ubuntu12 | 68 | ubuntu12:9300 | 9: 0/5039810 | none | demoted | catchingup
root@ubuntu11:~#
root@ubuntu11:~#
root@ubuntu11:~# pg_autoctl show state
Name |Node | Host:Port | TLI: LSN | Connection | Reported State | Assigned State
---------+-------+---------------+----------------+--------------+---------------------+--------------------
ubuntu13 | 60 | ubuntu13:9300 |10: 0/5039A10 | read-write | primary | primary
ubuntu12 | 68 | ubuntu12:9300 |10: 0/5039A10 | read-only | secondary | secondary
root@ubuntu11:~#
3.2 switchover手动切换
在待提升为主节点的备节点上执行pg_autoctl perform switchover，可以看到当前节点提升为主节点
root@ubuntu12:~# pg_autoctl perform switchover
05:12:23 213044 INFOTargetting group 0 in formation "default"
05:12:23 213044 INFOListening monitor notifications about state changes in formation "default" and group 0
05:12:23 213044 INFOFollowing table displays times when notifications are received
Time | Name |Node | Host:Port | Current State | Assigned State
---------+----------+-------+---------------+---------------------+--------------------
05:12:23 | ubuntu13 | 60 | ubuntu13:9300 | primary | draining
05:12:23 | ubuntu12 | 68 | ubuntu12:9300 | secondary | prepare_promotion
05:12:23 | ubuntu12 | 68 | ubuntu12:9300 | prepare_promotion | prepare_promotion
05:12:23 | ubuntu12 | 68 | ubuntu12:9300 | prepare_promotion | stop_replication
05:12:23 | ubuntu13 | 60 | ubuntu13:9300 | primary | demote_timeout
05:12:23 | ubuntu13 | 60 | ubuntu13:9300 | draining | demote_timeout
05:12:23 | ubuntu13 | 60 | ubuntu13:9300 | demote_timeout | demote_timeout
05:12:24 | ubuntu12 | 68 | ubuntu12:9300 | stop_replication | stop_replication
05:12:24 | ubuntu12 | 68 | ubuntu12:9300 | stop_replication | wait_primary
05:12:24 | ubuntu13 | 60 | ubuntu13:9300 | demote_timeout | demoted
05:12:24 | ubuntu13 | 60 | ubuntu13:9300 | demoted | demoted
05:12:24 | ubuntu12 | 68 | ubuntu12:9300 | wait_primary | wait_primary
05:12:24 | ubuntu13 | 60 | ubuntu13:9300 | demoted | catchingup
05:12:25 | ubuntu13 | 60 | ubuntu13:9300 | catchingup | catchingup
05:12:26 | ubuntu13 | 60 | ubuntu13:9300 | catchingup | secondary
05:12:26 | ubuntu13 | 60 | ubuntu13:9300 | secondary | secondary
05:12:26 | ubuntu12 | 68 | ubuntu12:9300 | wait_primary | primary
05:12:26 | ubuntu12 | 68 | ubuntu12:9300 | primary | primary
root@ubuntu12:~#从monitor节点也可以看到主备身份发生了变化
root@ubuntu11:~#
root@ubuntu11:~# pg_autoctl show state
Name |Node | Host:Port | TLI: LSN | Connection | Reported State | Assigned State
---------+-------+---------------+----------------+--------------+---------------------+--------------------
ubuntu13 | 60 | ubuntu13:9300 |11: 0/5039CC0 | read-only | secondary | secondary
ubuntu12 | 68 | ubuntu12:9300 |11: 0/5039CC0 | read-write | primary | primary
3.3 failover 切换
pg_autoctl perform failover需要在monitor节点上执行，其结果会将备用节点提升为主节点。
root@ubuntu11:~# pg_autoctl perform failover
05:15:57 774844 INFOWaiting 60 secs for a notification with state "primary" in formation "default" and group 0
05:15:57 774844 INFOListening monitor notifications about state changes in formation "default" and group 0
05:15:57 774844 INFOFollowing table displays times when notifications are received
Time | Name |Node | Host:Port | Current State | Assigned State
---------+----------+-------+---------------+---------------------+--------------------
05:15:57 | ubuntu12 | 68 | ubuntu12:9300 | primary | draining
05:15:57 | ubuntu13 | 60 | ubuntu13:9300 | secondary | prepare_promotion
05:15:57 | ubuntu13 | 60 | ubuntu13:9300 | prepare_promotion | prepare_promotion
05:15:57 | ubuntu13 | 60 | ubuntu13:9300 | prepare_promotion | stop_replication
05:15:57 | ubuntu12 | 68 | ubuntu12:9300 | primary | demote_timeout
05:15:57 | ubuntu12 | 68 | ubuntu12:9300 | draining | demote_timeout
05:15:57 | ubuntu12 | 68 | ubuntu12:9300 | demote_timeout | demote_timeout
05:15:58 | ubuntu13 | 60 | ubuntu13:9300 | stop_replication | stop_replication
05:15:58 | ubuntu13 | 60 | ubuntu13:9300 | stop_replication | wait_primary
05:15:58 | ubuntu12 | 68 | ubuntu12:9300 | demote_timeout | demoted
05:15:58 | ubuntu12 | 68 | ubuntu12:9300 | demoted | demoted
05:15:58 | ubuntu13 | 60 | ubuntu13:9300 | wait_primary | wait_primary
05:15:58 | ubuntu12 | 68 | ubuntu12:9300 | demoted | catchingup
05:15:59 | ubuntu12 | 68 | ubuntu12:9300 | catchingup | catchingup
05:16:00 | ubuntu12 | 68 | ubuntu12:9300 | catchingup | secondary
05:16:00 | ubuntu12 | 68 | ubuntu12:9300 | secondary | secondary
05:16:00 | ubuntu13 | 60 | ubuntu13:9300 | wait_primary | primary
05:16:00 | ubuntu13 | 60 | ubuntu13:9300 | primary | primary
root@ubuntu11:~#
root@ubuntu11:~# pg_autoctl show state
Name |Node | Host:Port | TLI: LSN | Connection | Reported State | Assigned State
---------+-------+---------------+----------------+--------------+---------------------+--------------------
ubuntu13 | 60 | ubuntu13:9300 |12: 0/503A0E8 | read-write | primary | primary
ubuntu12 | 68 | ubuntu12:9300 |12: 0/503A0E8 | read-only | secondary | secondary
root@ubuntu11:~#
root@ubuntu11:~#
4，pg_auto_failover添加节点
这里初始化新的机器ubuntu14，IP地址为192.168.152.124。此时主机列表如下，依次修改前三台主机的hosts映射文件，增加ubuntu14的地址与主机名。
192.168.152.121 ubuntu11
192.168.152.122 ubuntu12
192.168.152.123 ubuntu13
192.168.152.124 ubuntu14
使用pg_autoctl 创建注册到monitor节点。
/usr/local/pgsql16/server/bin/pg_autoctl create postgres --hostname ubuntu14 --name ubuntu14 --pgdata /usr/local/pgsql16/pg9300/data/ --pgport 9300 --auth trust --ssl-self-signed --monitor 'postgres://autoctl_node@ubuntu11:9300/pg_auto_failover?sslmode=require'
root@ubuntu14:~# su - postgres
postgres@ubuntu14:~$
postgres@ubuntu14:~$
postgres@ubuntu14:~$ /usr/local/pgsql16/server/bin/pg_autoctl create postgres --hostname ubuntu14 --name ubuntu14 --pgdata /usr/local/pgsql16/pg9300/data/ --pgport 9300 --auth trust --ssl-self-signed --monitor 'postgres://autoctl_node@ubuntu11:9300/pg_auto_failover?sslmode=require'
06:09:25 2643 INFOUsing default --ssl-mode "require"
06:09:25 2643 INFOUsing --ssl-self-signed: pg_autoctl will create self-signed certificates, allowing for encrypted network traffic
06:09:25 2643 WARNSelf-signed certificates provide protection against eavesdropping; this setup does NOT protect against Man-In-The-Middle attacks nor Impersonation attacks.
06:09:25 2643 WARNSee https://www.postgresql.org/docs/current/libpq-ssl.html for details
06:09:25 2643 INFOStarted pg_autoctl postgres service with pid 2645
06:09:25 2643 INFOStarted pg_autoctl node-init service with pid 2646
06:09:25 2645 INFO /usr/local/pgsql16/server/bin/pg_autoctl do service postgres --pgdata /usr/local/pgsql16/pg9300/data/ -v
06:09:25 2646 INFORegistered node 75 "ubuntu14" (ubuntu14:9300) in formation "default", group 0, state "wait_standby"
06:09:25 2646 INFOWriting keeper state file at "/home/postgres/.local/share/pg_autoctl/usr/local/pgsql16/pg9300/data/pg_autoctl.state"
06:09:25 2646 INFOWriting keeper init state file at "/home/postgres/.local/share/pg_autoctl/usr/local/pgsql16/pg9300/data/pg_autoctl.init"
06:09:25 2646 INFOSuccessfully registered as "wait_standby" to the monitor.
06:09:25 2646 INFOFSM transition from "init" to "wait_standby": Start following a primary
06:09:25 2646 INFOTransition complete: current state is now "wait_standby"
06:09:26 2646 INFOFSM transition from "wait_standby" to "catchingup": The primary is now ready to accept a standby
06:09:26 2646 INFOInitialising PostgreSQL as a hot standby
06:09:26 2646 INFO /usr/local/pgsql16/server/bin/pg_basebackup -w -d 'application_name=pgautofailover_standby_75 host=ubuntu13 port=9300 user=pgautofailover_replicator sslmode=require' --pgdata /usr/local/pgsql16/pg9300/backup/node_75 -U pgautofailover_replicator --verbose --progress --max-rate 100M --wal-method=stream --slot pgautofailover_standby_75
06:09:26 2646 INFOpg_basebackup: initiating base backup, waiting for checkpoint to complete
06:09:26 2646 INFOpg_basebackup: checkpoint completed
06:09:26 2646 INFOpg_basebackup: write-ahead log start point: 0/6000028 on timeline 12
06:09:26 2646 INFOpg_basebackup: starting background WAL receiver
06:09:26 2646 INFO22759/22759 kB (100%), 0/1 tablespace (...backup/node_75/global/pg_control)
06:09:26 2646 INFO22759/22759 kB (100%), 1/1 tablespace
06:09:26 2646 INFOpg_basebackup:
06:09:26 2646 INFO
06:09:26 2646 INFOwrite-ahead log end point: 0/6000100
06:09:26 2646 INFOpg_basebackup:
06:09:26 2646 INFO
06:09:26 2646 INFOwaiting for background process to finish streaming ...
06:09:26 2646 INFOpg_basebackup:
06:09:26 2646 INFO
06:09:26 2646 INFOsyncing data to disk ...
06:09:27 2646 INFOpg_basebackup:
06:09:27 2646 INFO
06:09:27 2646 INFOrenaming backup_manifest.tmp to backup_manifest
06:09:27 2646 INFOpg_basebackup:
06:09:27 2646 INFO
06:09:27 2646 INFObase backup completed
06:09:27 2646 INFOCreating the standby signal file at "/usr/local/pgsql16/pg9300/data/standby.signal", and replication setup at "/usr/local/pgsql16/pg9300/data/postgresql-auto-failover-standby.conf"
06:09:27 2646 INFOContents of "/usr/local/pgsql16/pg9300/data/postgresql-auto-failover-standby.conf" have changed, overwriting
06:09:27 2646 INFO /usr/bin/openssl req -new -x509 -days 365 -nodes -text -out /usr/local/pgsql16/pg9300/data/server.crt -keyout /usr/local/pgsql16/pg9300/data/server.key -subj "/CN=ubuntu14"
06:09:27 2668 INFO /usr/local/pgsql16/server/bin/postgres -D /usr/local/pgsql16/pg9300/data -p 9300 -h *
06:09:27 2646 INFOPostgreSQL started on port 9300
06:09:27 2646 INFOFetched current list of 2 other nodes from the monitor to update HBA rules, including 2 changes.
06:09:27 2646 INFOEnsuring HBA rules for node 60 "ubuntu13" (ubuntu13:9300)
06:09:27 2646 INFOEnsuring HBA rules for node 68 "ubuntu12" (ubuntu12:9300)
06:09:27 2646 INFOReloading Postgres configuration and HBA rules
06:09:27 2645 INFOPostgres is now serving PGDATA "/usr/local/pgsql16/pg9300/data" on port 9300 with pid 2668
06:09:27 2646 INFOTransition complete: current state is now "catchingup"
06:09:27 2646 INFOkeeper has been successfully initialized.
06:09:27 2643 WARNpg_autoctl service node-init exited with exit status 0
06:09:27 2645 INFOPostgres controller service received signal SIGTERM, terminating
06:09:27 2645 INFOStopping pg_autoctl postgres service
06:09:27 2645 INFO/usr/local/pgsql16/server/bin/pg_ctl --pgdata /usr/local/pgsql16/pg9300/data --wait stop --mode fast
06:09:27 2643 INFOStop pg_autoctl
postgres@ubuntu14:~$然后创建systemctl服务
pg_autoctl -q show systemd --pgdata "/usr/local/pgsql16/pg9300/data" | tee /etc/systemd/system/pgautofailover.servicesystemctl daemon-reloadsystemctl enable pgautofailoversystemctl start pgautofailover 此时从monitor节点中看到，新的ubuntu14节点已经作为从节点加入到了集群中。root@ubuntu11:~# pg_autoctl show state
Name |Node | Host:Port | TLI: LSN | Connection | Reported State | Assigned State
---------+-------+---------------+----------------+--------------+---------------------+--------------------
ubuntu13 | 60 | ubuntu13:9300 |12: 0/7000060 | read-write | primary | primary
ubuntu12 | 68 | ubuntu12:9300 |12: 0/7000060 | read-only | secondary | secondary
ubuntu14 | 75 | ubuntu14:9300 |12: 0/7000060 | read-only | secondary | secondary
root@ubuntu11:~#
root@ubuntu11:~# pg_autoctl show state
Name |Node | Host:Port | TLI: LSN | Connection | Reported State | Assigned State
---------+-------+---------------+----------------+--------------+---------------------+--------------------
ubuntu13 | 60 | ubuntu13:9300 |12: 0/7000060 | read-write | primary | primary
ubuntu12 | 68 | ubuntu12:9300 |12: 0/7000060 | read-only | secondary | secondary
ubuntu14 | 75 | ubuntu14:9300 |12: 0/7000060 | read-only | secondary | secondary
root@ubuntu11:~#
root@ubuntu11:~#与此同时，pg_auto_failover会自动将集群升级为强同步模式（number_sync_standbys=1）
root@ubuntu11:~# pg_autoctl get formation settings
Context | Name | Setting | Value
----------+----------+---------------------------+---------------------------------------------------------------
formation |default | number_sync_standbys | 1
primary | ubuntu13 | synchronous_standby_names | 'ANY 1 (pgautofailover_standby_68, pgautofailover_standby_75)'
node | ubuntu13 | candidate priority | 50
node | ubuntu12 | candidate priority | 50
node | ubuntu14 | candidate priority | 50
node | ubuntu13 | replication quorum | true
node | ubuntu12 | replication quorum | true
node | ubuntu14 | replication quorum | true
root@ubuntu11:~#如果不希望新节点的candidate-priority为默认的50，可以降低其candidate-priority优先级
在ubuntu14自身节点上执行pg_autoctl set node candidate-priority --name ubuntu14 10 --monitor 'postgres://autoctl_node@ubuntu11:9300/pg_auto_failover?sslmode=require'
root@ubuntu14:~# pg_autoctl set node candidate-priority --name ubuntu14 10 --monitor 'postgres://autoctl_node@ubuntu11:9300/pg_auto_failover?sslmode=require'
06:26:00 6614 INFOWaiting for the settings to have been applied to the monitor and primary node
06:26:00 6614 INFONew state is reported by node 60 "ubuntu13" (ubuntu13:9300): "apply_settings"
06:26:00 6614 INFOSetting goal state of node 60 "ubuntu13" (ubuntu13:9300) to primary after it applied replication properties change.
06:26:01 6614 INFONew state is reported by node 60 "ubuntu13" (ubuntu13:9300): "primary"
10
root@ubuntu14:~#然后从monitor上查看
###candidate priority修改前
root@ubuntu11:~# pg_autoctl get formation settings
Context | Name | Setting | Value
----------+----------+---------------------------+---------------------------------------------------------------
formation |default | number_sync_standbys | 1
primary | ubuntu13 | synchronous_standby_names | 'ANY 1 (pgautofailover_standby_68, pgautofailover_standby_75)'
node | ubuntu13 | candidate priority | 50
node | ubuntu12 | candidate priority | 50
node | ubuntu14 | candidate priority | 50
node | ubuntu13 | replication quorum | true
node | ubuntu12 | replication quorum | true
node | ubuntu14 | replication quorum | true
###candidate priority修改后
root@ubuntu11:~#
root@ubuntu11:~# pg_autoctl get formation settings
Context | Name | Setting | Value
----------+----------+---------------------------+---------------------------------------------------------------
formation |default | number_sync_standbys | 1
primary | ubuntu13 | synchronous_standby_names | 'ANY 1 (pgautofailover_standby_68, pgautofailover_standby_75)'
node | ubuntu13 | candidate priority | 50
node | ubuntu12 | candidate priority | 50
node | ubuntu14 | candidate priority | 10
node | ubuntu13 | replication quorum | true
node | ubuntu12 | replication quorum | true
node | ubuntu14 | replication quorum | true尝试将ubuntu14节点的quorum设置为false时报错，应该是条件不满足
root@ubuntu14:~# pg_autoctl set node replication-quorum --name ubuntu14 false--pgdata /usr/local/pgsql16/pg9300/data/ --monitor 'postgres://autoctl_node@ubuntu11:9300/pg_auto_failover?sslmode=require'
06:30:53 7313 WARNGiven --monitor URI, the --pgdata option is ignored
06:30:53 7313 INFOConnecting to monitor at "postgres://autoctl_node@ubuntu11:9300/pg_auto_failover?sslmode=require"
06:30:53 7313 ERROR Monitor ERROR:can't set replication quorum to false
06:30:53 7313 ERROR Monitor DETAIL:At least 2 standby nodes are required in formation default with number_sync_standbys = 1, and only 1 would be participating in the replication quorum
06:30:53 7313 ERROR SQL query: SELECT pgautofailover.set_node_replication_quorum($1, $2, $3)
06:30:53 7313 ERROR SQL params: 'default', 'ubuntu14', 'false'
06:30:53 7313 ERROR Failed to update node replication quorum on node "ubuntu14"in formation "default" for replication_quorum: "false"
06:30:53 7313 ERROR Failed to set "replication-quorum" to "false".
root@ubuntu14:~#
5，其他命令
配置文件查看pg_autoctl show file
monitor节点
root@ubuntu11:~# pg_autoctl show file
File | Path
--------+----------------
Config | /root/.config/pg_autoctl/usr/local/pgsql16/pg9300/data/pg_autoctl.cfg
Pid | /run/user/0/pg_autoctl/usr/local/pgsql16/pg9300/data/pg_autoctl.pid
root@ubuntu11:~#数据节点
root@ubuntu12:~#
root@ubuntu12:~# pg_autoctl show file
File | Path
--------+----------------
Config | /root/.config/pg_autoctl/usr/local/pgsql16/pg9300/data/pg_autoctl.cfg
State | /root/.local/share/pg_autoctl/usr/local/pgsql16/pg9300/data/pg_autoctl.state
Init | /root/.local/share/pg_autoctl/usr/local/pgsql16/pg9300/data/pg_autoctl.init
Pid | /run/user/0/pg_autoctl/usr/local/pgsql16/pg9300/data/pg_autoctl.pid
从monitor中删除节点
pg_autoctl drop node --hostname ubuntu13
清除.local中的文件
pg_autoctl drop node --destory
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