环境信息
hostname IP port role comm ms81 192.168.188.81 3399 master ms82 192.168.188.82 3399 slave ms83 192.168.188.83 3399 slave ms84 192.168.188.84 6033 proxysql&sysbench
- ProxySQL version 2.0.11-124-g971c15e, codename Truls
- MySQL 8.0.19 x86_64
- mysqlsh 8.0.20
- CentOS 7.8.2003 on Docker
配置MySQL
通过MySQL Shell配置singlePrimary模式MGR
配置用户
mysql> set global super_read_only=0;
mysql> create user mgr@'192.168.188.%' identified by 'mgr';
mysql> grant all privileges on *.* to mgr@'192.168.188.%' with grant option;
mysql> create user kk@'192.168.188.%' identified by 'kk';
mysql> grant all privileges on *.* to kk@'192.168.188.%';
mysql> create user proxy@'192.168.188.%' identified with mysql_native_password by 'proxy';
mysql> grant all privileges on *.* to proxy@'192.168.188.%';
mysql> create user monitor@'192.168.188.%' identified with mysql_native_password by 'monitor';
mysql> grant replication client on *.* to monitor@'192.168.188.%';
mysql> reset master;
mysql> create database kk;
运行proxysql需要的脚本
[13:46:00] root@ms81:/ofiles # mysql -S /data/mysql/mysql3399/tmp/mysql.sock < addition_to_sys8.sql
#记得授权！
mysql> grant select on sys.gr_member_routing_candidate_status to 'monitor'@'192.168.188.%';
Query OK, 0 rows affected (0.12 sec)
配置ProxySQL
定义并配置proxysql的HostGroups
gid hostgroup 100 read 111 write 122 backup_write 404 offline
mysql> show create table mysql_group_replication_hostgroups\G
*************************** 1. row ***************************
table: mysql_group_replication_hostgroups
Create Table: CREATE TABLE mysql_group_replication_hostgroups (
writer_hostgroup INT CHECK (writer_hostgroup>=0) NOT NULL PRIMARY KEY,
backup_writer_hostgroup INT CHECK (backup_writer_hostgroup>=0 AND backup_writer_hostgroup<>writer_hostgroup) NOT NULL,
reader_hostgroup INT NOT NULL CHECK (reader_hostgroup<>writer_hostgroup AND backup_writer_hostgroup<>reader_hostgroup AND reader_hostgroup>0),
offline_hostgroup INT NOT NULL CHECK (offline_hostgroup<>writer_hostgroup AND offline_hostgroup<>reader_hostgroup AND backup_writer_hostgroup<>offline_hostgroup AND offline_hostgroup>=0),
active INT CHECK (active IN (0,1)) NOT NULL DEFAULT 1,
max_writers INT NOT NULL CHECK (max_writers >= 0) DEFAULT 1,
writer_is_also_reader INT CHECK (writer_is_also_reader IN (0,1,2)) NOT NULL DEFAULT 0,
max_transactions_behind INT CHECK (max_transactions_behind>=0) NOT NULL DEFAULT 0,
comment VARCHAR,
UNIQUE (reader_hostgroup),
UNIQUE (offline_hostgroup),
UNIQUE (backup_writer_hostgroup))
1 row in set (0.00 sec)
这里没修改 max_writers ，默认为1。 不建议增加，即使是multiPromary模式，proxysql也建议使用单写。
mysql> insert into mysql_group_replication_hostgroups(writer_hostgroup,backup_writer_hostgroup,reader_hostgroup,offline_hostgroup,active) values (111,122,100,404,1);
Query OK, 1 row affected (0.00 sec)
mysql> select * from mysql_group_replication_hostgroups;
+------------------+-------------------------+------------------+-------------------+--------+-------------+-----------------------+-------------------------+---------+
| writer_hostgroup | backup_writer_hostgroup | reader_hostgroup | offline_hostgroup | active | max_writers | writer_is_also_reader | max_transactions_behind | comment |
+------------------+-------------------------+------------------+-------------------+--------+-------------+-----------------------+-------------------------+---------+
| 111 | 122 | 100 | 404 | 1 | 1 | 0 | 0 | NULL |
+------------------+-------------------------+------------------+-------------------+--------+-------------+-----------------------+-------------------------+---------+
1 row in set (0.00 sec)
添加servers
mysql> show create table mysql_servers\G
*************************** 1. row ***************************
table: mysql_servers
Create Table: CREATE TABLE mysql_servers (
hostgroup_id INT CHECK (hostgroup_id>=0) NOT NULL DEFAULT 0,
hostname VARCHAR NOT NULL,
port INT CHECK (port >= 0 AND port port OR gtid_port=0) AND gtid_port >= 0 AND gtid_port = 0 AND weight =0) NOT NULL DEFAULT 1000,
max_replication_lag INT CHECK (max_replication_lag >= 0 AND max_replication_lag =0) NOT NULL DEFAULT 0,
comment VARCHAR NOT NULL DEFAULT '',
PRIMARY KEY (hostgroup_id, hostname, port) )
1 row in set (0.00 sec)
mysql> insert into mysql_servers(hostgroup_id,hostname,port,max_connections) values (100,'192.168.188.81',3399,200);
Query OK, 1 row affected (0.00 sec)
mysql> insert into mysql_servers(hostgroup_id,hostname,port,max_connections) values (100,'192.168.188.82',3399,200);
Query OK, 1 row affected (0.00 sec)
mysql> insert into mysql_servers(hostgroup_id,hostname,port,max_connections) values (100,'192.168.188.83',3399,200);
Query OK, 1 row affected (0.00 sec)
mysql> select hostgroup_id,hostname,port,max_connections from mysql_servers;
+--------------+----------------+------+-----------------+
| hostgroup_id | hostname | port | max_connections |
+--------------+----------------+------+-----------------+
| 100 | 192.168.188.81 | 3399 | 200 |
| 100 | 192.168.188.82 | 3399 | 200 |
| 100 | 192.168.188.83 | 3399 | 200 |
+--------------+----------------+------+-----------------+
3 rows in set (0.00 sec)
mysql> load mysql servers to run;
Query OK, 0 rows affected (0.01 sec)
mysql> save mysql servers to disk;
Query OK, 0 rows affected (0.83 sec)
添加user
mysql> show create table mysql_users\G
*************************** 1. row ***************************
table: mysql_users
Create Table: CREATE TABLE mysql_users (
username VARCHAR NOT NULL,
password VARCHAR,
active INT CHECK (active IN (0,1)) NOT NULL DEFAULT 1,
use_ssl INT CHECK (use_ssl IN (0,1)) NOT NULL DEFAULT 0,
default_hostgroup INT NOT NULL DEFAULT 0,
default_schema VARCHAR,
schema_locked INT CHECK (schema_locked IN (0,1)) NOT NULL DEFAULT 0,
transaction_persistent INT CHECK (transaction_persistent IN (0,1)) NOT NULL DEFAULT 1,
fast_forward INT CHECK (fast_forward IN (0,1)) NOT NULL DEFAULT 0,
backend INT CHECK (backend IN (0,1)) NOT NULL DEFAULT 1,
frontend INT CHECK (frontend IN (0,1)) NOT NULL DEFAULT 1,
max_connections INT CHECK (max_connections >=0) NOT NULL DEFAULT 10000,
comment VARCHAR NOT NULL DEFAULT '',
PRIMARY KEY (username, backend),
UNIQUE (username, frontend))
1 row in set (0.00 sec)
mysql> insert into mysql_users(username,password,active,default_hostgroup,default_schema) values ('proxy','proxy',1,100,'kk');
Query OK, 1 row affected (0.00 sec)
mysql> insert into mysql_users(username,password,active,default_hostgroup,default_schema) values ('kk','kk',1,100,'kk');
Query OK, 1 row affected (0.00 sec)
mysql> select * from mysql_users;
+----------+----------+--------+---------+-------------------+----------------+---------------+------------------------+--------------+---------+----------+-----------------+---------+
| username | password | active | use_ssl | default_hostgroup | default_schema | schema_locked | transaction_persistent | fast_forward | backend | frontend | max_connections | comment |
+----------+----------+--------+---------+-------------------+----------------+---------------+------------------------+--------------+---------+----------+-----------------+---------+
| proxy | proxy | 1 | 0 | 100 | kk | 0 | 1 | 0 | 1 | 1 | 10000 | |
| kk | kk | 1 | 0 | 100 | kk | 0 | 1 | 0 | 1 | 1 | 10000 | |
+----------+----------+--------+---------+-------------------+----------------+---------------+------------------------+--------------+---------+----------+-----------------+---------+
2 rows in set (0.00 sec)
mysql> load mysql users to run;
Query OK, 0 rows affected (0.00 sec)
mysql> save mysql users to disk;
Query OK, 0 rows affected (0.36 sec)
检查一下，可以看到已经根据节点状态进行分组
mysql> select * from monitor.mysql_server_group_replication_log;
mysql> select * from runtime_mysql_servers;
+--------------+----------------+------+-----------+--------+--------+-------------+-----------------+---------------------+---------+----------------+---------+
| hostgroup_id | hostname | port | gtid_port | status | weight | compression | max_connections | max_replication_lag | use_ssl | max_latency_ms | comment |
+--------------+----------------+------+-----------+--------+--------+-------------+-----------------+---------------------+---------+----------------+---------+
| 100 | 192.168.188.82 | 3399 | 0 | ONLINE | 1 | 0 | 200 | 0 | 0 | 0 | |
| 111 | 192.168.188.81 | 3399 | 0 | ONLINE | 1 | 0 | 200 | 0 | 0 | 0 | |
| 100 | 192.168.188.83 | 3399 | 0 | ONLINE | 1 | 0 | 200 | 0 | 0 | 0 | |
+--------------+----------------+------+-----------+--------+--------+-------------+-----------------+---------------------+---------+----------------+---------+
3 rows in set (0.01 sec)
添加规则前做一次性能测试
[15:37:26] root@ms84:~ # sysbench /usr/share/sysbench/oltp_read_write.lua --db-driver=mysql --mysql-host=192.168.188.84 --mysql-port=6033 --mysql-user=kk --mysql-password=kk --mysql-db=kk --table-size=50000 prepare
sysbench 1.0.17 (using system LuaJIT 2.0.4)
Creating table 'sbtest1'...
FATAL: mysql_drv_query() returned error 1290 (The MySQL server is running with the --super-read-only option so it cannot execute this statement) for query 'CREATE TABLE sbtest1(
id INTEGER NOT NULL AUTO_INCREMENT,
k INTEGER DEFAULT '0' NOT NULL,
c CHAR(120) DEFAULT '' NOT NULL,
pad CHAR(60) DEFAULT '' NOT NULL,
PRIMARY KEY (id)
) /*! ENGINE = innodb */ '
FATAL: `sysbench.cmdline.call_command' function failed: /usr/share/sysbench/oltp_common.lua:197: SQL error, errno = 1290, state = 'HY000': The MySQL server is running with the --super-read-only option so it cannot execute this statement
看来需要修改一下，不然找不到rw服务器…… 默认都发给只读组了。
这块实验中发现了个问题，sysbench通过proxysql的服务端口连接后，无法进行任何操作：
mysql> show tables;
ERROR 1045 (28000): Access denied for user 'kk'@'ms84.net188' (using password: YES)
可以发现，用户被解析成proxysql的域名来源了，而实际上对kk用户的授权做的是 kk@'192.168.188.%',
查看了一下MySQL的参数文件，原因为：
mysql> show global variables like '%reso%';
+-------------------+-------+
| Variable_name | Value |
+-------------------+-------+
| skip_name_resolve | OFF |
+-------------------+-------+
1 row in set (0.01 sec)
可以设置为1， 或重新建立用户 kk@'%' ，在本次实验里，由于设计的是所有访问通过proxysql，proxysql以kk用户与MySQL MGR通信
因此在这里我另外建立了用户'kk'@'ms84.net188'，并授权。
再次通过其它IP使用proxysql的服务端口登录后，查看当前用户为：
mysql> select current_user();
+----------------+
| current_user() |
+----------------+
| kk@ms84.net188 |
+----------------+
1 row in set (0.00 sec)
可以看到，无论发起连接请求的client在哪里，current_user 都是proxysql的domain，这也验证了前面的猜测。
proxysql修改：
mysql> update mysql_users set default_hostgroup=111 where username='kk';
Query OK, 1 row affected (0.00 sec)
mysql> load mysql users to run;
Query OK, 0 rows affected (0.00 sec)
[15:39:01] root@ms84:~ # sysbench /usr/share/sysbench/oltp_read_write.lua --db-driver=mysql --mysql-host=192.168.188.84 --mysql-port=6033 --mysql-user=kk --mysql-password=kk --mysql-db=kk --table-size=50000 prepare
sysbench 1.0.17 (using system LuaJIT 2.0.4)
Creating table 'sbtest1'...
Inserting 50000 records into 'sbtest1'
Creating a secondary index on 'sbtest1'...
[15:40:57] root@ms84:~ # sysbench /usr/share/sysbench/oltp_read_write.lua --db-driver=mysql --mysql-host=192.168.188.84 --mysql-port=6033 --mysql-user=kk --mysql-password=kk --mysql-db=kk --table-size=50000 run
sysbench 1.0.17 (using system LuaJIT 2.0.4)
Running the test with following options:
Number of threads: 1
Initializing random number generator from current time
Initializing worker threads...
Threads started!
SQL statistics:
queries performed:
read: 714
write: 204
other: 102
total: 1020
transactions: 51 (5.00 per sec.)
queries: 1020 (100.03 per sec.)
ignored errors: 0 (0.00 per sec.)
reconnects: 0 (0.00 per sec.)
General statistics:
total time: 10.1929s
total number of events: 51
Latency (ms):
min: 104.38
avg: 199.83
max: 444.15
95th percentile: 297.92
sum: 10191.23
Threads fairness:
events (avg/stddev): 51.0000/0.00
execution time (avg/stddev): 10.1912/0.00
mysql> select hostgroup,digest, digest_text,count_star from stats.stats_mysql_query_digest;
+-----------+--------------------+--------------------------------------------------------------------+------------+
| hostgroup | digest | digest_text | count_star |
+-----------+--------------------+--------------------------------------------------------------------+------------+
| 111 | 0xE52A0A0210634DAC | INSERT INTO sbtest1 (id, k, c, pad) VALUES (?, ?, ?, ?) | 52 |
| 111 | 0xE365BEB555319B9E | DELETE FROM sbtest1 WHERE id=? | 52 |
| 111 | 0xFB239BC95A23CA36 | UPDATE sbtest1 SET c=? WHERE id=? | 52 |
| 111 | 0xC19480748AE79B4B | SELECT DISTINCT c FROM sbtest1 WHERE id BETWEEN ? AND ? ORDER BY c | 52 |
| 111 | 0xAC80A5EA0101522E | SELECT c FROM sbtest1 WHERE id BETWEEN ? AND ? ORDER BY c | 52 |
| 111 | 0xC198E52BCCB481C7 | UPDATE sbtest1 SET k=k+? WHERE id=? | 52 |
| 111 | 0xDBF868B2AA296BC5 | SELECT SUM(k) FROM sbtest1 WHERE id BETWEEN ? AND ? | 52 |
| 111 | 0x290B92FD743826DA | SELECT c FROM sbtest1 WHERE id BETWEEN ? AND ? | 52 |
| 111 | 0xBF001A0C13781C1D | SELECT c FROM sbtest1 WHERE id=? | 511 |
| 111 | 0x695FBF255DBEB0DD | COMMIT | 52 |
| 111 | 0xFAD1519E4760CBDE | BEGIN | 52 |
+-----------+--------------------+--------------------------------------------------------------------+------------+
11 rows in set (0.01 sec)
做完全的读写分离规则
在这里做完全的读写分离.
可以看出来在一台物理server上这样搞是有损失的，哈哈
mysql> insert into mysql_query_rules(rule_id,active,match_pattern,destination_hostgroup,apply) values (1,1,'^SELECT.*FOR UPDATE$',111,1);
Query OK, 1 row affected (0.00 sec)
mysql> insert into mysql_query_rules(rule_id,active,match_pattern,destination_hostgroup,apply) values (2,1,'^SELECT.*',100,1);
Query OK, 1 row affected (0.00 sec)
mysql> select * from mysql_query_rules;
+---------+--------+----------+------------+--------+-------------+------------+------------+--------+--------------+----------------------+----------------------+--------------+---------+-----------------+-----------------------+-----------+--------------------+---------------+-----------+---------+---------+-------+-------------------+----------------+------------------+-----------+--------+-------------+-----------+---------------------+-----+-------+---------+
| rule_id | active | username | schemaname | flagIN | client_addr | proxy_addr | proxy_port | digest | match_digest | match_pattern | negate_match_pattern | re_modifiers | flagOUT | replace_pattern | destination_hostgroup | cache_ttl | cache_empty_result | cache_timeout | reconnect | timeout | retries | delay | next_query_flagIN | mirror_flagOUT | mirror_hostgroup | error_msg | OK_msg | sticky_conn | multiplex | gtid_from_hostgroup | log | apply | comment |
+---------+--------+----------+------------+--------+-------------+------------+------------+--------+--------------+----------------------+----------------------+--------------+---------+-----------------+-----------------------+-----------+--------------------+---------------+-----------+---------+---------+-------+-------------------+----------------+------------------+-----------+--------+-------------+-----------+---------------------+-----+-------+---------+
| 1 | 1 | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | ^SELECT.*FOR UPDATE$ | 0 | CASELESS | NULL | NULL | 111 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | NULL | NULL | NULL | NULL | NULL | NULL | NULL | NULL | NULL | 1 | NULL |
| 2 | 1 | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | ^SELECT.* | 0 | CASELESS | NULL | NULL | 100 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | NULL | NULL | NULL | NULL | NULL | NULL | NULL | NULL | NULL | 1 | NULL |
+---------+--------+----------+------------+--------+-------------+------------+------------+--------+--------------+----------------------+----------------------+--------------+---------+-----------------+-----------------------+-----------+--------------------+---------------+-----------+---------+---------+-------+-------------------+----------------+------------------+-----------+--------+-------------+-----------+---------------------+-----+-------+---------+
2 rows in set (0.00 sec)
mysql> load mysql query rules to run;
Query OK, 0 rows affected (0.00 sec)
mysql> save mysql query rules to disk;
Query OK, 0 rows affected (0.47 sec)
mysql> select hostgroup,digest, digest_text,count_star from stats.stats_mysql_query_digest_reset;
[15:51:54] root@ms84:~ # sysbench /usr/share/sysbench/oltp_read_write.lua --db-driver=mysql --mysql-host=192.168.188.84 --mysql-port=6033 --mysql-user=kk --mysql-password=kk --mysql-db=kk --table-size=50000 run
sysbench 1.0.17 (using system LuaJIT 2.0.4)
Running the test with following options:
Number of threads: 1
Initializing random number generator from current time
Initializing worker threads...
Threads started!
SQL statistics:
queries performed:
read: 672
write: 192
other: 96
total: 960
transactions: 48 (4.79 per sec.)
queries: 960 (95.87 per sec.)
ignored errors: 0 (0.00 per sec.)
reconnects: 0 (0.00 per sec.)
General statistics:
total time: 10.0099s
total number of events: 48
Latency (ms):
min: 104.58
avg: 208.51
max: 458.81
95th percentile: 331.91
sum: 10008.26
Threads fairness:
events (avg/stddev): 48.0000/0.00
execution time (avg/stddev): 10.0083/0.00
mysql> select hostgroup,digest, digest_text,count_star from stats.stats_mysql_query_digest;
+-----------+--------------------+--------------------------------------------------------------------+------------+
| hostgroup | digest | digest_text | count_star |
+-----------+--------------------+--------------------------------------------------------------------+------------+
| 111 | 0xE52A0A0210634DAC | INSERT INTO sbtest1 (id, k, c, pad) VALUES (?, ?, ?, ?) | 49 |
| 111 | 0xFB239BC95A23CA36 | UPDATE sbtest1 SET c=? WHERE id=? | 49 |
| 111 | 0xC198E52BCCB481C7 | UPDATE sbtest1 SET k=k+? WHERE id=? | 49 |
| 100 | 0xC19480748AE79B4B | SELECT DISTINCT c FROM sbtest1 WHERE id BETWEEN ? AND ? ORDER BY c | 49 |
| 100 | 0xAC80A5EA0101522E | SELECT c FROM sbtest1 WHERE id BETWEEN ? AND ? ORDER BY c | 49 |
| 111 | 0xE365BEB555319B9E | DELETE FROM sbtest1 WHERE id=? | 49 |
| 100 | 0x290B92FD743826DA | SELECT c FROM sbtest1 WHERE id BETWEEN ? AND ? | 49 |
| 100 | 0xBF001A0C13781C1D | SELECT c FROM sbtest1 WHERE id=? | 481 |
| 100 | 0xDBF868B2AA296BC5 | SELECT SUM(k) FROM sbtest1 WHERE id BETWEEN ? AND ? | 49 |
| 111 | 0x695FBF255DBEB0DD | COMMIT | 49 |
| 111 | 0xFAD1519E4760CBDE | BEGIN | 49 |
+-----------+--------------------+--------------------------------------------------------------------+------------+
11 rows in set (0.01 sec)
看一下MGR做failover时，proxysql的状态。
- 当前MGR状态
MySQL 192.168.188.81:3399 ssl JS > cl.status()
{
"clusterName": "kk",
"defaultReplicaSet": {
"name": "default",
"primary": "ms81:3399",
"ssl": "REQUIRED",
"status": "OK",
"statusText": "Cluster is ONLINE and can tolerate up to ONE failure.",
"topology": {
"ms81:3399": {
"address": "ms81:3399",
"mode": "R/W",
"readReplicas": {},
"replicationLag": null,
"role": "HA",
"status": "ONLINE",
"version": "8.0.19"
},
"ms82:3399": {
"address": "ms82:3399",
"mode": "R/O",
"readReplicas": {},
"replicationLag": "00:00:00.317335",
"role": "HA",
"status": "ONLINE",
"version": "8.0.19"
},
"ms83:3399": {
"address": "ms83:3399",
"mode": "R/O",
"readReplicas": {},
"replicationLag": "00:00:00.227030",
"role": "HA",
"status": "ONLINE",
"version": "8.0.19"
}
},
"topologyMode": "Single-Primary"
},
"groupInformationSourceMember": "ms81:3399"
}
- 当前proxysql mysql_servers状态
mysql> select * from runtime_mysql_servers;
+--------------+----------------+------+-----------+--------+--------+-------------+-----------------+---------------------+---------+----------------+---------+
| hostgroup_id | hostname | port | gtid_port | status | weight | compression | max_connections | max_replication_lag | use_ssl | max_latency_ms | comment |
+--------------+----------------+------+-----------+--------+--------+-------------+-----------------+---------------------+---------+----------------+---------+
| 100 | 192.168.188.83 | 3399 | 0 | ONLINE | 1 | 0 | 200 | 0 | 0 | 0 | |
| 111 | 192.168.188.81 | 3399 | 0 | ONLINE | 1 | 0 | 200 | 0 | 0 | 0 | |
| 100 | 192.168.188.82 | 3399 | 0 | ONLINE | 1 | 0 | 200 | 0 | 0 | 0 | |
+--------------+----------------+------+-----------+--------+--------+-------------+-----------------+---------------------+---------+----------------+---------+
3 rows in set (0.01 sec)
- 将当前master重启，再查看proxysql mysql_servers
master:
mysql> shutdown ;
Query OK, 0 rows affected (0.00 sec)
mysql> mysql> select * from runtime_mysql_servers;
+--------------+----------------+------+-----------+---------+--------+-------------+-----------------+---------------------+---------+----------------+---------+
| hostgroup_id | hostname | port | gtid_port | status | weight | compression | max_connections | max_replication_lag | use_ssl | max_latency_ms | comment |
+--------------+----------------+------+-----------+---------+--------+-------------+-----------------+---------------------+---------+----------------+---------+
| 100 | 192.168.188.83 | 3399 | 0 | ONLINE | 1 | 0 | 200 | 0 | 0 | 0 | |
| 404 | 192.168.188.81 | 3399 | 0 | SHUNNED | 1 | 0 | 200 | 0 | 0 | 0 | |
| 111 | 192.168.188.82 | 3399 | 0 | ONLINE | 1 | 0 | 200 | 0 | 0 | 0 | |
+--------------+----------------+------+-----------+---------+--------+-------------+-----------------+---------------------+---------+----------------+---------+
3 rows in set (0.00 sec)
- 重启master ，再查看
master
[16:12:33] root@ms81:~ # mysqld --defaults-file=/data/mysql/mysql3399/my3399.cnf &
使用MySQL shell构建的MGR ，在节点重启后会自动启动GR
mysql> select * from runtime_mysql_servers;
+--------------+----------------+------+-----------+--------+--------+-------------+-----------------+---------------------+---------+----------------+---------+
| hostgroup_id | hostname | port | gtid_port | status | weight | compression | max_connections | max_replication_lag | use_ssl | max_latency_ms | comment |
+--------------+----------------+------+-----------+--------+--------+-------------+-----------------+---------------------+---------+----------------+---------+
| 100 | 192.168.188.83 | 3399 | 0 | ONLINE | 1 | 0 | 200 | 0 | 0 | 0 | |
| 111 | 192.168.188.82 | 3399 | 0 | ONLINE | 1 | 0 | 200 | 0 | 0 | 0 | |
| 100 | 192.168.188.81 | 3399 | 0 | ONLINE | 1 | 0 | 200 | 0 | 0 | 0 | |
+--------------+----------------+------+-----------+--------+--------+-------------+-----------------+---------------------+---------+----------------+---------+
3 rows in set (0.00 sec)
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Original: https://www.cnblogs.com/konggg/p/13571589.html
Author: 孔个个
Title: proxySQL with MGR
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