MySQL Group Replication如何获取主节点ip地址

Posted 2023-02-24

【中文标题】MySQL Group Replication如何获取主节点ip地址

【英文标题】：How MySQL Group Replication get primary node ip address

【发布时间】：2017-05-12 09:11:13

【问题描述】：

根据mysql 5.7参考手册：

http://dev.mysql.com/doc/refman/5.7/en/group-replication-find-primary.html

http://dev.mysql.com/doc/refman/5.7/en/group-replication-monitoring.html

在单模式部署组复制时，我们可以使用下面的 sql 来查找主节点的主机名：

mysql> SELECT * FROM performance_schema.replication_group_members WHERE MEMBER_ID = (SELECT VARIABLE_VALUE FROM performance_schema.global_status WHERE VARIABLE_NAME= 'group_replication_primary_member');
+---------------------------+--------------------------------------+-------------+-------------+--------------+
| CHANNEL_NAME              | MEMBER_ID                            | MEMBER_HOST | MEMBER_PORT | MEMBER_STATE |
+---------------------------+--------------------------------------+-------------+-------------+--------------+
| group_replication_applier | 9176f4d3-c7f6-11e6-bcf7-fa163ee40410 | myhost      |       24801 | ONLINE       |
+---------------------------+--------------------------------------+-------------+-------------+--------------+
1 row in set (0.00 sec)

问题是：如何获取ip地址而不是主机名？

【参考方案1】：

您无法获取主机名的任何 IP 地址。如果您正在连接到某个主机，那么您知道该主机名的 IP 地址。这是 mysql 论坛上的 mailing list，对您有帮助。

【参考方案2】：

好的，我们可以使用名为report_host的属性来指向我们的ip地址，例如：

在我自己的机器上，我部署了三个节点(s1,s2,s3)组成一个复制组，一共my.cnf，定义它（10.202.7.88是我的ip地址）：

report_host=10.202.7.88

然后重启所有节点，重新配置三个节点组成复制组，然后查询：

mysql> select * from performance_schema.replication_group_members;
+---------------------------+--------------------------------------+-------------+-------------+--------------+
| CHANNEL_NAME              | MEMBER_ID                            | MEMBER_HOST | MEMBER_PORT | MEMBER_STATE |
+---------------------------+--------------------------------------+-------------+-------------+--------------+
| group_replication_applier | 933a5345-d321-11e6-b971-fa163ee40410 | 10.202.7.88 |       24801 | ONLINE       |
| group_replication_applier | 9abe6249-d321-11e6-bb5c-fa163ee40410 | 10.202.7.88 |       24802 | ONLINE       |
| group_replication_applier | a1c89c34-d321-11e6-bbbc-fa163ee40410 | 10.202.7.88 |       24803 | ONLINE       |
+---------------------------+--------------------------------------+-------------+-------------+--------------+
3 rows in set (0.00 sec)

然后我们可以使用上面我们提到的sql来获取主节点ip地址：

mysql> SELECT * FROM performance_schema.replication_group_members WHERE MEMBER_ID = (SELECT VARIABLE_VALUE FROM performance_schema.global_status WHERE VARIABLE_NAME= 'group_replication_primary_member');
+---------------------------+--------------------------------------+-------------+-------------+--------------+
| CHANNEL_NAME              | MEMBER_ID                            | MEMBER_HOST | MEMBER_PORT | MEMBER_STATE |
+---------------------------+--------------------------------------+-------------+-------------+--------------+
| group_replication_applier | 933a5345-d321-11e6-b971-fa163ee40410 | 10.202.7.88 |       24801 | ONLINE       |
+---------------------------+--------------------------------------+-------------+-------------+--------------+
1 row in set (0.00 sec)