在用戶的實際環境里，可能有時需要修改主機的IP，這就涉及到集群的配置修改。以下以例子的方式，介紹下KingbaseES R6集群如何修改IP。
一、案例測試環境
操作系統：
[KINGBASE@node1 bin]$ cat /etc/centos-release
CentOS Linux release 7.2.1511 (Core)
數據庫環境：
[KINGBASE@node1 bin]$ ./ksql -U system test
ksql (V8.0)
Type "help" for help.
test=# select version();
version
-----------------------------------------------------------------------------------------------------------
KINGBASEES V008R006C003B0010 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 4.1.2 20080704 (Red Hat 4.1.2-46), 64-bit
(1 row)
二、修改前集群主備庫狀態信息
1、節點狀態信息
[KINGBASE@node1 bin]$ ./repmgr cluster show ID | Name | Role | Status | Upstream | Location | Priority | Timeline | Connection string ----+---------+---------+-----------+----------+----------+----------+----------+--------------------------------------------------------------------------------------------------------------------------------------------------- 1 | node248 | standby | running | node249 | default | 100 | 4 | host=192.168.7.238 user=esrep dbname=esrep port=54321 connect_timeout=10 keepalives=1 keepalives_idle=10 keepalives_interval=1 keepalives_count=3 2 | node249 | primary | * running | | default | 100 | 4 | host=192.168.7.239 user=esrep dbname=esrep port=54321 connect_timeout=10 keepalives=1 keepalives_idle=10 keepalives_interval=1 keepalives_count=3
2、查看repmgr.conf配置文件信息（主備庫）
[KINGBASE@node1 etc]$ cat repmgr.conf
on_bmj=off
node_id=1
node_name='node248'
promote_command='/home/KINGBASE/cluster/R6HA/KHA/KINGBASE/bin/repmgr standby promote -f /home/KINGBASE/cluster/R6HA/KHA/KINGBASE/etc/repmgr.conf'
follow_command='/home/KINGBASE/cluster/R6HA/KHA/KINGBASE/bin/repmgr standby follow -f /home/KINGBASE/cluster/R6HA/KHA/KINGBASE/etc/repmgr.conf -W --upstream-node-id=%n'
conninfo='host=192.168.7.238 user=esrep dbname=esrep port=54321 connect_timeout=10 keepalives=1 keepalives_idle=10 keepalives_interval=1 keepalives_count=3'
log_file='/home/KINGBASE/cluster/R6HA/KHA/KINGBASE/hamgr.log'
data_directory='/home/KINGBASE/cluster/R6HA/KHA/KINGBASE/data'
sys_bindir='/home/KINGBASE/cluster/R6HA/KHA/KINGBASE/bin'
ssh_options='-q -o ConnectTimeout=10 -o StrictHostKeyChecking=no -o ServerAliveInterval=2 -o ServerAliveCountMax=5 -p 22'
reconnect_attempts=3
reconnect_interval=5
failover='automatic'
recovery='manual'
monitoring_history='no'
trusted_servers='192.168.7.1'
virtual_ip='192.168.7.237/24'
net_device='enp0s3'
ipaddr_path='/sbin'
arping_path='/sbin'
synchronous='quorum'
repmgrd_pid_file='/home/KINGBASE/cluster/R6HA/KHA/KINGBASE/hamgrd.pid'
ping_path='/usr/bin'
3、查看系統 ip 信息
主節點：
[KINGBASE@node2 ~]$ cat /etc/hosts
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.7.238 node1
192.168.7.239 node2
2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 08:00:27:48:34:53 brd ff:ff:ff:ff:ff:ff
inet 192.168.7.239/24 brd 192.168.7.255 scope global enp0s3
valid_lft forever preferred_lft forever
inet 192.168.7.237/24 scope global secondary enp0s3:3
valid_lft forever preferred_lft forever
備節點：
[KINGBASE@node1 bin]$ cat /etc/hosts 127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 ::1 localhost localhost.localdomain localhost6 localhost6.localdomain6 192.168.7.238 node1 192.168.7.239 node2 2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 08:00:27:73:47:f6 brd ff:ff:ff:ff:ff:ff inet 192.168.7.238/24 brd 192.168.7.255 scope global enp0s3
二、修改系統IP並應用新的物理IP
1、關閉集群（cluster和db）
[KINGBASE@node2 bin]$ ./sys_monitor.sh stop 2021-03-01 12:19:00 Ready to stop all DB ... Service process "node_export" was killed at process 4629 Service process "postgres_ex" was killed at process 4630 Service process "node_export" was killed at process 9260 Service process "postgres_ex" was killed at process 9261 2021-03-01 12:19:07 begin to stop repmgrd on "[192.168.7.238]". 2021-03-01 12:19:08 repmgrd on "[192.168.7.238]" stop success. 2021-03-01 12:19:08 begin to stop repmgrd on "[192.168.7.239]". 2021-03-01 12:19:09 repmgrd on "[192.168.7.239]" stop success. 2021-03-01 12:19:09 begin to stop DB on "[192.168.7.238]". waiting for server to shut down.... done server stopped 2021-03-01 12:19:10 DB on "[192.168.7.238]" stop success. 2021-03-01 12:19:10 begin to stop DB on "[192.168.7.239]". waiting for server to shut down.... done server stopped 2021-03-01 12:19:11 DB on "[192.168.7.239]" stop success. 2021-03-01 12:19:11 Done.
2、修改主備節點操作系統IP
[root@node2 ~]# cat /etc/hosts 127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 ::1 localhost localhost.localdomain localhost6 localhost6.localdomain6 192.168.7.248 node1 192.168.7.249 node2
主節點：
2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 08:00:27:48:34:53 brd ff:ff:ff:ff:ff:ff
inet 192.168.7.249/24 brd 192.168.7.255 scope global enp0s3
valid_lft forever preferred_lft forever
備節點：
2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 08:00:27:73:47:f6 brd ff:ff:ff:ff:ff:ff
inet 192.168.7.248/24 brd 192.168.7.255 scope global enp0s3
valid_lft forever preferred_lft forever
三、修改repmgr.conf配置文件（主備庫所有node）
備節點：
[KINGBASE@node1 etc]$ cat repmgr.conf on_bmj=off node_id=1 node_name='node248' promote_command='/home/KINGBASE/cluster/R6HA/KHA/KINGBASE/bin/repmgr standby promote -f /home/KINGBASE/cluster/R6HA/KHA/KINGBASE/etc/repmgr.conf' follow_command='/home/KINGBASE/cluster/R6HA/KHA/KINGBASE/bin/repmgr standby follow -f /home/KINGBASE/cluster/R6HA/KHA/KINGBASE/etc/repmgr.conf -W --upstream-node-id=%n' conninfo='host=192.168.7.248 user=esrep dbname=esrep port=54321 connect_timeout=10 keepalives=1 keepalives_idle=10 keepalives_interval=1 keepalives_count=3' log_file='/home/KINGBASE/cluster/R6HA/KHA/KINGBASE/hamgr.log' data_directory='/home/KINGBASE/cluster/R6HA/KHA/KINGBASE/data' sys_bindir='/home/KINGBASE/cluster/R6HA/KHA/KINGBASE/bin' ssh_options='-q -o ConnectTimeout=10 -o StrictHostKeyChecking=no -o ServerAliveInterval=2 -o ServerAliveCountMax=5 -p 22' reconnect_attempts=3 reconnect_interval=5 failover='automatic' recovery='manual' monitoring_history='no' trusted_servers='192.168.7.1' virtual_ip='192.168.7.240/24' net_device='enp0s3' ipaddr_path='/sbin' arping_path='/sbin' synchronous='quorum' repmgrd_pid_file='/home/KINGBASE/cluster/R6HA/KHA/KINGBASE/hamgrd.pid' ping_path='/usr/bin'
主節點：
[KINGBASE@node2 etc]$ cat repmgr.conf on_bmj=off node_id=2 node_name=node249 promote_command='/home/KINGBASE/cluster/R6HA/KHA/KINGBASE/bin/repmgr standby promote -f /home/KINGBASE/cluster/R6HA/KHA/KINGBASE/etc/repmgr.conf' follow_command='/home/KINGBASE/cluster/R6HA/KHA/KINGBASE/bin/repmgr standby follow -f /home/KINGBASE/cluster/R6HA/KHA/KINGBASE/etc/repmgr.conf -W --upstream-node-id=%n' conninfo='host=192.168.7.249 user=esrep dbname=esrep port=54321 connect_timeout=10 keepalives=1 keepalives_idle=10 keepalives_interval=1 keepalives_count=3' log_file='/home/KINGBASE/cluster/R6HA/KHA/KINGBASE/hamgr.log' data_directory='/home/KINGBASE/cluster/R6HA/KHA/KINGBASE/data' sys_bindir='/home/KINGBASE/cluster/R6HA/KHA/KINGBASE/bin' ssh_options='-q -o ConnectTimeout=10 -o StrictHostKeyChecking=no -o ServerAliveInterval=2 -o ServerAliveCountMax=5 -p 22' reconnect_attempts=3 reconnect_interval=5 failover='automatic' recovery='manual' monitoring_history='no' trusted_servers='192.168.7.1' virtual_ip='192.168.7.240/24' net_device='enp0s3' ipaddr_path='/sbin' arping_path='/sbin' synchronous='quorum' repmgrd_pid_file='/home/KINGBASE/cluster/R6HA/KHA/KINGBASE/hamgrd.pid' ping_path='/usr/bin'
四、啟動主備庫數據庫服務
手動啟動主備數據庫：
[KINGBASE@node2 bin]$ ./sys_ctl start -D ../data waiting for server to start....2021-03-01 12:06:25.776 CST [4661] LOG: sepapower extension initialized 2021-03-01 12:06:25.818 CST [4661] LOG: starting KINGBASEES V008R006C003B0010 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 4.1.2 20080704 (Red Hat 4.1.2-46), 64-bit 2021-03-01 12:06:25.818 CST [4661] LOG: listening on IPv4 address "0.0.0.0", port 54321 2021-03-01 12:06:25.818 CST [4661] LOG: listening on IPv6 address "::", port 54321 2021-03-01 12:06:25.905 CST [4661] LOG: listening on Unix socket "/tmp/.s.KINGBASE.54321" .2021-03-01 12:06:26.425 CST [4661] LOG: redirecting log output to logging collector process 2021-03-01 12:06:26.425 CST [4661] HINT: Future log output will appear in directory "sys_log". done server started
五、注冊主庫到集群
1、注冊primary到集群
[KINGBASE@node2 bin]$ ./repmgr primary register -F INFO: connecting to primary database... INFO: "repmgr" extension is already installed NOTICE: PING 192.168.7.240 (192.168.7.240) 56(84) bytes of data. --- 192.168.7.240 ping statistics --- 2 packets transmitted, 0 received, 100% packet loss, time 1000ms WARNING: ping host"192.168.7.240" failed DETAIL: average RTT value is not greater than zero NOTICE: node (ID: 2) acquire the virtual ip 192.168.7.240/24 success NOTICE: primary node record (ID: 2) updated
2、查看集群節點狀態
[KINGBASE@node2 bin]$ ./repmgr cluster show ID | Name | Role | Status | Upstream | Location | Priority | Timeline | Connection string ----+---------+---------+---------------+----------+----------+----------+------- 1 | node248 | standby | ? unreachable | node249 | default | 100 | ? | host=192.168.7.238 user=esrep dbname=esrep port=54321 connect_timeout=10 keepalives=1 keepalives_idle=10 keepalives_interval=1 keepalives_count=3 2 | node249 | primary | * running | | default | 100 | 4 | host=192.168.7.249 user=esrep dbname=esrep port=54321 connect_timeout=10 keepalives=1 keepalives_idle=10 keepalives_interval=1 keepalives_count=3 WARNING: following issues were detected - unable to connect to node "node248" (ID: 1) - node "node248" (ID: 1) is registered as an active standby but is unreachable
六、注冊備庫到集群
1、直接注冊備庫到集群會出現無法連接的故障（需要關閉備庫數據庫服務）
[KINGBASE@node1 bin]$ ./repmgr standby register -h 192.168.7.249 -d esrep -U esrep -W -F
WARNING: following problems with command line parameters detected:
--no-wait will be ignored when executing STANDBY REGISTER
INFO: connecting to local node "node248" (ID: 1)
WARNING: database connection parameters not required when the standby to be registered is running
DETAIL: repmgr uses the "conninfo" parameter in "repmgr.conf" to connect to the standby
INFO: connecting to primary database
ERROR: connection to database failed
DETAIL:
could not connect to server: No route to host
Is the server running on host "192.168.7.239" and accepting
TCP/IP connections on port 54321?
DETAIL: attempted to connect using:
user=esrep connect_timeout=10 dbname=esrep host=192.168.7.239 port=54321 keepalives=1 keepalives_idle=10 keepalives_interval=1 keepalives_count=3 fallback_application_name=repmgr
ERROR: connection to database failed
DETAIL:
could not connect to server: No route to host
Is the server running on host "192.168.7.238" and accepting
TCP/IP connections on port 54321?
DETAIL: attempted to connect using:
user=esrep connect_timeout=10 dbname=esrep host=192.168.7.238 port=54321 keepalives=1 keepalives_idle=10 keepalives_interval=1 keepalives_count=3 fallback_application_name=repmgr
ERROR: unable to connect to the primary database
HINT: a primary node must be configured before registering a standby node
2、關閉備庫數據庫服務后將備庫節點重新加入到集群
關閉備庫：
[KINGBASE@node1 bin]$ ./sys_ctl stop -D ../data waiting for server to shut down.... done server stopped
注冊standby到集群：
[KINGBASE@node1 bin]$ ./repmgr standby register -h 192.168.7.249 -U esrep -d esrep -F INFO: connecting to local node "node248" (ID: 1) INFO: connecting to primary database INFO: standby registration complete NOTICE: standby node "node248" (ID: 1) successfully registered
將備庫節點重新加入到集群：
[KINGBASE@node1 bin]$ ./repmgr node rejoin -h 192.168.7.249 -U esrep -d esrep INFO: timelines are same, this server is not ahead DETAIL: local node lsn is 1/EEFF5AB0, rejoin target lsn is 1/EEFF7E78 NOTICE: setting node 1's upstream to node 2 WARNING: unable to ping "host=192.168.7.248 user=esrep dbname=esrep port=54321 connect_timeout=10 keepalives=1 keepalives_idle=10 keepalives_interval=1 keepalives_count=3" DETAIL: PQping() returned "PQPING_NO_RESPONSE" NOTICE: begin to start server at 2021-03-01 12:18:21.290629 NOTICE: starting server using "/home/KINGBASE/cluster/R6HA/KHA/KINGBASE/bin/sys_ctl -w -t 90 -D '/home/KINGBASE/cluster/R6HA/KHA/KINGBASE/data' -l /home/KINGBASE/cluster/R6HA/KHA/KINGBASE/bin/logfile start" NOTICE: start server finish at 2021-03-01 12:18:21.906449 NOTICE: NODE REJOIN successful DETAIL: node 1 is now attached to node 2 [KINGBASE@node1 bin]$ ./repmgr cluster show ID | Name | Role | Status | Upstream | Location | Priority | Timeline | Connection string ----+---------+---------+-----------+----------+----------+----------+----------+ 1 | node248 | standby | running | node249 | default | 100 | 4 | host=192.168.7.248 user=esrep dbname=esrep port=54321 connect_timeout=10 keepalives=1 keepalives_idle=10 keepalives_interval=1 keepalives_count=3 2 | node249 | primary | * running | | default | 100 | 4 | host=192.168.7.249 user=esrep dbname=esrep port=54321 connect_timeout=10 keepalives=1 keepalives_idle=10 keepalives_interval=1 keepalives_count=3
3、主庫查看集群狀態和主備流復制狀態
1）查看集群節點狀態
[KINGBASE@node2 bin]$ ./repmgr cluster show
ID | Name | Role | Status | Upstream | Location | Priority | Timeline | Connection string
----+---------+---------+-----------+----------+----------+----------+----------+
1 | node248 | standby | running | node249 | default | 100 | 4 | host=192.168.7.248 user=esrep dbname=esrep port=54321 connect_timeout=10 keepalives=1 keepalives_idle=10 keepalives_interval=1 keepalives_count=3
2 | node249 | primary | * running | | default | 100 | 4 | host=192.168.7.249 user=esrep dbname=esrep port=54321 connect_timeout=10 keepalives=1 keepalives_idle=10 keepalives_interval=1 keepalives_count=3
2）查看主備流復制狀態
test=# select * from sys_stat_replication;
pid | usesysid | usename | application_name | client_addr | client_hostname | client_port | backend_st
art | backend_xmin | state | sent_lsn | write_lsn | flush_lsn | replay_lsn | write_lag | flush_lag
| replay_lag | sync_priority | sync_state | reply_time
------+----------+---------+------------------+---------------+-----------------+
4939 | 16384 | esrep | node248 | 192.168.7.248 | | 44492 | 2021-03-01 12:17:4
1.036448+08 | | streaming | 1/EEFF7FC0 | 1/EEFF7FC0 | 1/EEFF7FC0 | 1/EEFF7FC0 | |
| | 1 | quorum | 2021-03-01 12:20:49.634460+08
(1 row)
4、啟動主備庫repmgrd服務
[KINGBASE@node2 bin]$ ./repmgrd -d
[2021-03-01 12:32:27] [NOTICE] redirecting logging output to "/home/KINGBASE/cluster/R6HA/KHA/KINGBASE/hamgr.log"
七、重啟集群服務驗證
1、通過sys_monitor.sh啟動集群
[KINGBASE@node2 bin]$ ./sys_monitor.sh restart
2021-03-01 12:20:29 Ready to stop all DB ...
There is no service "node_export" running currently.
There is no service "postgres_ex" running currently.
There is no service "node_export" running currently.
There is no service "postgres_ex" running currently.
2021-03-01 12:20:34 begin to stop repmgrd on "[192.168.7.248]".
2021-03-01 12:20:35 repmgrd on "[192.168.7.248]" already stopped.
2021-03-01 12:20:35 begin to stop repmgrd on "[192.168.7.249]".
2021-03-01 12:20:36 repmgrd on "[192.168.7.249]" already stopped.
2021-03-01 12:20:36 begin to stop DB on "[192.168.7.248]".
waiting for server to shut down.... done
server stopped
2021-03-01 12:20:37 DB on "[192.168.7.248]" stop success.
2021-03-01 12:20:37 begin to stop DB on "[192.168.7.249]".
waiting for server to shut down..... done
server stopped
2021-03-01 12:20:39 DB on "[192.168.7.249]" stop success.
2021-03-01 12:20:39 Done.
2021-03-01 12:20:39 Ready to start all DB ...
2021-03-01 12:20:39 begin to start DB on "[192.168.7.249]".
waiting for server to start.... done
server started
2021-03-01 12:20:41 execute to start DB on "[192.168.7.249]" success, connect to check it.
2021-03-01 12:20:42 DB on "[192.168.7.249]" start success.
2021-03-01 12:20:42 Try to ping trusted_servers on host 192.168.7.248 ...
2021-03-01 12:20:45 Try to ping trusted_servers on host 192.168.7.249 ...
2021-03-01 12:20:47 begin to start DB on "[192.168.7.248]".
waiting for server to start.... done
server started
2021-03-01 12:20:49 execute to start DB on "[192.168.7.248]" success, connect to check it.
2021-03-01 12:20:50 DB on "[192.168.7.248]" start success.
ID | Name | Role | Status | Upstream | Location | Priority | Timeline | Connection string
----+---------+---------+-----------+----------+----------+----------+----------+
1 | node248 | standby | running | node249 | default | 100 | 4 | host=192.168.7.248 user=esrep dbname=esrep port=54321 connect_timeout=10 keepalives=1 keepalives_idle=10 keepalives_interval=1 keepalives_count=3
2 | node249 | primary | * running | | default | 100 | 4 | host=192.168.7.249 user=esrep dbname=esrep port=54321 connect_timeout=10 keepalives=1 keepalives_idle=10 keepalives_interval=1 keepalives_count=3
2021-03-01 12:20:50 The primary DB is started.
2021-03-01 12:20:55 Success to load virtual ip [192.168.7.240/24] on primary host [192.168.7.249].
2021-03-01 12:20:55 Try to ping vip on host 192.168.7.248 ...
2021-03-01 12:20:57 Try to ping vip on host 192.168.7.249 ...
2021-03-01 12:21:00 begin to start repmgrd on "[192.168.7.248]".
[2021-03-01 12:21:42] [NOTICE] using provided configuration file "/home/KINGBASE/cluster/R6HA/KHA/KINGBASE/bin/../etc/repmgr.conf"
[2021-03-01 12:21:42] [NOTICE] redirecting logging output to "/home/KINGBASE/cluster/R6HA/KHA/KINGBASE/hamgr.log"
2021-03-01 12:21:01 repmgrd on "[192.168.7.248]" start success.
2021-03-01 12:21:01 begin to start repmgrd on "[192.168.7.249]".
[2021-03-01 12:21:02] [NOTICE] using provided configuration file "/home/KINGBASE/cluster/R6HA/KHA/KINGBASE/bin/../etc/repmgr.conf"
[2021-03-01 12:21:02] [NOTICE] redirecting logging output to "/home/KINGBASE/cluster/R6HA/KHA/KINGBASE/hamgr.log"
2021-03-01 12:21:03 repmgrd on "[192.168.7.249]" start success.
ID | Name | Role | Status | Upstream | repmgrd | PID | Paused? | Upstream last seen
----+---------+---------+-----------+----------+---------+------+---------+--------------------
1 | node248 | standby | running | node249 | running | 5135 | no | 1 second(s) ago
2 | node249 | primary | * running | | running | 6723 | no | n/a
2021-03-01 12:21:10 Done.
2、查看集群節點狀態
[KINGBASE@node2 bin]$ ./repmgr cluster show
ID | Name | Role | Status | Upstream | Location | Priority | Timeline | Connection string
----+---------+---------+-----------+----------+----------+----------+----------+--------
1 | node248 | standby | running | node249 | default | 100 | 4 | host=192.168.7.248 user=esrep dbname=esrep port=54321 connect_timeout=10 keepalives=1 keepalives_idle=10 keepalives_interval=1 keepalives_count=3
2 | node249 | primary | * running | | default | 100 | 4 | host=192.168.7.249 user=esrep dbname=esrep port=54321 connect_timeout=10 keepalives=1 keepalives_idle=10 keepalives_interval=1 keepalives_count=3
3、查看主備流復制狀態
[KINGBASE@node2 bin]$ ./ksql -U system test
ksql (V8.0)
Type "help" for help.
test=# select * from sys_stat_replication;
pid | usesysid | usename | application_name | client_addr | client_hostname | client_port | backend_st
art | backend_xmin | state | sent_lsn | write_lsn | flush_lsn | replay_lsn | write_lag | flush_lag
| replay_lag | sync_priority | sync_state | reply_time
------+----------+---------+------------------+---------------+-----------------+--------
6203 | 16384 | esrep | node248 | 192.168.7.248 | | 44499 | 2021-03-01 12:20:4
9.781155+08 | | streaming | 1/EEFF9090 | 1/EEFF9090 | 1/EEFF9090 | 1/EEFF9090 | |
| | 1 | quorum | 2021-03-01 12:22:02.817815+08
(1 row)
八、總結
集群物理IP和VIP修改成功，對於集群IP的修改需要停止集群服務（cluster和db），將影響業務的正常運行，所以在集群部署前需要做好IP的規划，避免在后期修改給業務正常運行帶來影響。
操作步驟總結：
1、查看和確定主備庫后，關閉集群（cluster和db）服務。
2、修改系統ip及/etc/hosts文件中ip。
3、修改集群主備庫配置文件repmgr.conf中的物理ip和vip信息。
4、重啟系統網絡服務應用新的物理ip。
5、啟動主備庫數據庫服務。
6、注冊主庫到集群。
7、關閉備庫數據庫服務，注冊備庫到集群並將備庫節點重新加入到集群。
8、查看集群服務狀態（cluster和db）並啟動主備庫repmgrd服務。
9、重啟集群（sys_monitor.sh）服務驗證。