1.  

案例环境：

  1. 操作系统：
       [root@node1 ~]# cat /etc/centos-release
    CentOS Linux release 7.2.1511 (Core) 
    ​
    数据库：
    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)

集群架构：

一、查看当前集群节点状态信息

1、集群节点信息

  1. [kingbase@node3 bin]$ ./repmgr cluster show
     ID | Name    | Role    | Status    | Upstream | Location | Priority | Timeline | Connection string                                                                                                                                
    ----+---------+---------+-----------+----------+----------+----------+----
     1  | node248 | primary | * running |          | default  | 100      | 5        | 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 | standby |   running | node248  | default  | 100      | 5        | 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  | node243 | standby |   running | node248  | default  | 100      | 5        | host=192.168.7.243 user=esrep dbname=esrep port=54321 connect_timeout=10 keepalives=1 keepalives_idle=10 keepalives_interval=1 keepalives_count=3

2、主备流复制信息

  1. test=# select * from sys_stat_replication;
     pid  | usesysid | usename | application_name |  client_addr  | client_hostname | client_port |         backend_start         | backend_xmin |   state   |  sent_lsn  | write_lsn  | flush_lsn  | replay_lsn | write_lag | flush_lag | replay_lag | sync_priority | sync_state |          reply_time    
    ------+----------+---------+------------------+---------------+-----------
     3403 |    16384 | esrep   | node249          | 192.168.7.249 |                 |       14247 | 2021-03-01 12:03:37.651419+08 |              | streaming | 1/F9005BA0 | 1/F9005BA0 | 1/F9005BA0 | 1/F9005BA0 |           |           |            |             1 | quorum     | 2021-03-01 12:31:56.432910+08
     3419 |    16384 | esrep   | node243          | 192.168.7.243 |                 |       34939 | 2021-03-01 12:03:43.876552+08 |              | streaming | 1/F9005BA0 | 1/F9005BA0 | 1/F9005BA0 | 1/F9005BA0 |           |           |            |             1 | quorum     | 2021-03-01 12:30:42.663663+08
    (2 rows)

3、复制槽信息

  1. test=# select * from sys_replication_slots;  
       slot_name   | plugin | slot_type | datoid | database | temporary | active | active_pid | xmin | catalog_xmin | restart_lsn | confirmed_flush_lsn 
    ---------------+--------+-----------+--------+----------+-----------+--------+------------+------+--------------+-------------+---------------------
     repmgr_slot_2 |        | physical  |        |          | f         | t      |       3403 |      |              | 1/F9005BA0  | 
     repmgr_slot_3 |        | physical  |        |          | f         | t      |       3419 |      |              | 1/F9005BA0  | 
    (2 rows)

二、将standby节点unregister

1、unregister standby node

  1. 在要删除的Standby 节点执行：​
    [kingbase@node3 bin]$ ./repmgr standby unregister;
    INFO: connecting to local standby
    INFO: connecting to primary database
    NOTICE: unregistering node 3
    INFO: try to drop slot "repmgr_slot_3" of node 3 on primary node
    WARNING: replication slot "repmgr_slot_3" is still active on node 3
    INFO: standby unregistration complete
    ​

2、查看集群节点信息

  1. [kingbase@node3 bin]$ ./repmgr cluster show
     ID | Name    | Role    | Status    | Upstream | Location | Priority | Timeline | Connection string                                                                                                                                
    ----+---------+---------+-----------+----------+----------+----------+----
     1  | node248 | primary | * running |          | default  | 100      | 5        | 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 | standby |   running | node248  | default  | 100      | 5        | 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

=== 从以上获知，集群节点信息已经没有unregister的节点信息===

三、停止本地集群服务删除复制槽

1、停止本地集群服务

  1. [kingbase@node3 bin]$ ./sys_monitor.sh stoplocal
    Service process "node_export" was killed at process 4928
    Service process "postgres_ex" was killed at process 4929
    2021-03-01 12:33:52 begin to stop repmgrd on "[localhost]".
    2021-03-01 12:33:54 repmgrd on "[localhost]" stop success.
    2021-03-01 12:33:54 begin to stop DB on "[localhost]".
    waiting for server to shut down.... done
    server stopped
    2021-03-01 12:33:55 DB on "[localhost]" stop success.

2、关闭cron计划任务：

  1. [kingbase@node2 bin]$ cat /etc/cron.d/KINGBASECRON
  2. #*/1 * * * * kingbase . /etc/profile;/home/kingbase/cluster/R6HA/KHA/kingbase/bin/kbha -A daemon -f /home/kingbase/cluster/R6HA/KHA/kingbase/bin/../etc/repmgr.conf >> /home/kingbase/cluster/R6HA/KHA/kingbase/bin/../kbha.log 2>&1
  3. #*/1 * * * * kingbase  /home/kingbase/cluster/kha/db/bin/network_rewind.sh

3、停止hamgr进程：

  1. [kingbase@node2 bin]$ ps -ef |grep repmgr
  2. kingbase  7536     1  0 12:20 ?        00:01:12 /home/kingbase/cluster/R6HA/KHA/kingbase/bin/repmgrd -d -v -f /home/kingbase/cluster/R6HA/KHA/kingbase/bin/../etc/repmgr.conf
  3. kingbase  7955     1  0 12:21 ?        00:00:01 /home/kingbase/cluster/R6HA/KHA/kingbase/bin/kbha -A daemon -f /home/kingbase/cluster/R6HA/KHA/kingbase/bin/../etc/repmgr.conf
  4.  
  5. [kingbase@node2 bin]$ kill -2 7536 7955

4、停止export进程：

  1. [kingbase@node2 bin]$ ps -ef |grep kingbase
  2. kingbase  8190     1  0 12:21 ?        00:00:00 /home/kingbase/cluster/R6HA/KHA/kingbase/bin/../share/node_exporter
  3. kingbase  8191     1  0 12:21 ?        00:00:00 /home/kingbase/cluster/R6HA/KHA/kingbase/bin/../share/postgres_exporter
  4. ......
  5. [kingbase@node2 bin]$ kill -9 8190 8191

5、查看复制槽信息

  1. test=# select * from sys_replication_slots;
  2.    slot_name   | plugin | slot_type | datoid | database | temporary | active | active_pid | xmin | catalog_xmin | restart_lsn | confirmed_flush_lsn
  3. ---------------+--------+-----------+--------+----------+-----------+--------+------------+------+--------------+-------------+---------------------
  4.  repmgr_slot_2 |        | physical  |        |          | f         | t      |       3403 |      |              | 1/F9007590  |
  5.  repmgr_slot_3 |        | physical  |        |          | f         | f      |            |      |              | 1/F9007590  |
  6. (2 rows)

6、删除复制槽

  1. test=# select sys_drop_replication_slot('repmgr_slot_3');
  2.  sys_drop_replication_slot
  3. ---------------------------
  4.  
  5. (1 row)
  1. test=# select * from sys_replication_slots;
  2.    slot_name   | plugin | slot_type | datoid | database | temporary | active | active_pid | xmin | catalog_xmin | restart_lsn | confirmed_flush_lsn
  3. ---------------+--------+-----------+--------+----------+-----------+--------+------------+------+--------------+-------------+---------------------
  4.  repmgr_slot_2 |        | physical  |        |          | f         | t      |       3403 |      |              | 1/F9007590  |
  5. (1 row)

7、查看流复制信息

  1. test=# select * from sys_stat_replication;
  2.  pid  | usesysid | usename | application_name |  client_addr  | client_hostname | client_port |         backend_start         | backend_xmin |   state   |  sent_lsn  | write_lsn  | flush_lsn  | replay_lsn | write_lag | flush_lag | replay_lag | sync_priority | sync_state |          reply_time
  3. ------+----------+---------+------------------+---------------+-----------------+-------------+-------------------------------+--------------+------
  4.  3403 |    16384 | esrep   | node249          | 192.168.7.249 |                 |       14247 | 2021-03-01 12:03:37.651419+08 |              | streaming | 1/F9007590 | 1/F9007590 | 1/F9007590 | 1/F9007590 |           |           |            |             1 | quorum     | 2021-03-01 12:35:38.819940+08
  5. (1 row)

四、重新启动集群服务测试

  1. [kingbase@node1 bin]$ ./sys_monitor.sh restart
  2. 2021-03-01 12:37:43 Ready to stop all DB ...
  3. Service process "node_export" was killed at process 4546
  4. Service process "postgres_ex" was killed at process 4547
  5. Service process "node_export" was killed at process 4242
  6. Service process "postgres_ex" was killed at process 4243
  7. 2021-03-01 12:37:49 begin to stop repmgrd on "[192.168.7.248]".
  8. 2021-03-01 12:37:50 repmgrd on "[192.168.7.248]" stop success.
  9. 2021-03-01 12:37:50 begin to stop repmgrd on "[192.168.7.249]".
  10. 2021-03-01 12:37:51 repmgrd on "[192.168.7.249]" stop success.
  11. 2021-03-01 12:37:51 begin to stop DB on "[192.168.7.249]".
  12. waiting for server to shut down.... done
  13. server stopped
  14. 2021-03-01 12:37:52 DB on "[192.168.7.249]" stop success.
  15. 2021-03-01 12:37:52 begin to stop DB on "[192.168.7.248]".
  16. waiting for server to shut down..... done
  17. server stopped
  18. 2021-03-01 12:37:53 DB on "[192.168.7.248]" stop success.
  19. 2021-03-01 12:37:53 Done.
  20. 2021-03-01 12:37:53 Ready to start all DB ...
  21. 2021-03-01 12:37:53 begin to start DB on "[192.168.7.248]".
  22. waiting for server to start.... done
  23. server started
  24. 2021-03-01 12:37:55 execute to start DB on "[192.168.7.248]" success, connect to check it.
  25. 2021-03-01 12:37:56 DB on "[192.168.7.248]" start success.
  26. 2021-03-01 12:37:56 Try to ping trusted_servers on host 192.168.7.248 ...
  27. 2021-03-01 12:37:59 Try to ping trusted_servers on host 192.168.7.249 ...
  28. 2021-03-01 12:38:01 begin to start DB on "[192.168.7.249]".
  29. waiting for server to start.... done
  30. server started
  31. 2021-03-01 12:38:03 execute to start DB on "[192.168.7.249]" success, connect to check it.
  32. 2021-03-01 12:38:04 DB on "[192.168.7.249]" start success.
  33.  ID | Name    | Role    | Status    | Upstream | Location | Priority | Timeline | Connection string
  34. ----+---------+---------+-----------+----------+----------+----------+----------+---------------------------------------------------------------------------------------------------------------------------------------------------
  35.  1  | node248 | primary | * running |          | default  | 100      | 5        | 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
  36.  2  | node249 | standby |   running | node248  | default  | 100      | 5        | 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
  37. 2021-03-01 12:38:04 The primary DB is started.
  38. 2021-03-01 12:38:08 Success to load virtual ip [192.168.7.240/24] on primary host [192.168.7.248].
  39. 2021-03-01 12:38:08 Try to ping vip on host 192.168.7.248 ...
  40. 2021-03-01 12:38:11 Try to ping vip on host 192.168.7.249 ...
  41. 2021-03-01 12:38:13 begin to start repmgrd on "[192.168.7.248]".
  42. [2021-03-01 12:38:14] [NOTICE] using provided configuration file "/home/kingbase/cluster/R6HA/KHA/kingbase/bin/../etc/repmgr.conf"
  43. [2021-03-01 12:38:14] [NOTICE] redirecting logging output to "/home/kingbase/cluster/R6HA/KHA/kingbase/hamgr.log"
  44.  
  45. 2021-03-01 12:38:14 repmgrd on "[192.168.7.248]" start success.
  46. 2021-03-01 12:38:14 begin to start repmgrd on "[192.168.7.249]".
  47. [2021-03-01 12:38:45] [NOTICE] using provided configuration file "/home/kingbase/cluster/R6HA/KHA/kingbase/bin/../etc/repmgr.conf"
  48. [2021-03-01 12:38:45] [NOTICE] redirecting logging output to "/home/kingbase/cluster/R6HA/KHA/kingbase/hamgr.log"
  49.  
  50. 2021-03-01 12:38:15 repmgrd on "[192.168.7.249]" start success.
  51.  ID | Name    | Role    | Status    | Upstream | repmgrd | PID   | Paused? | Upstream last seen
  52. ----+---------+---------+-----------+----------+---------+-------+---------+--------------------
  53.  1  | node248 | primary | * running |          | running | 14373 | no      | n/a
  54.  2  | node249 | standby |   running | node248  | running | 12219 | no      | n/a
  55. 2021-03-01 12:38:23 Done.

=== 重新启动集群服务，启动后集群节点状态正常，standby节点删除成功===

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