【DB宝45】MySQL高可用之MGR+Consul架构部署（下）

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小麦苗DB宝 发表于 2021/03/29 09:31:16 2021/03/29
【摘要】 4.3、service配置官网配置参考：https://www.consul.io/docs/discovery/services在3台MySQL节点上都需要操作，注意修改address地址为本机地址：cat > /etc/consul.d/rw-mysql-mgr-server-lhr.json <<"EOF"{ "service": { "name": "rw-my...

4.3、service配置

官网配置参考：https://www.consul.io/docs/discovery/services

在3台MySQL节点上都需要操作，注意修改address地址为本机地址：

cat > /etc/consul.d/rw-mysql-mgr-server-lhr.json <<"EOF"
{
  "service": 
    {
      "name": "rw-mysql-mgr-server-lhr",
      "tags": ["MGR-Master"],
      "address": "192.168.68.60",
      "port": 3306,
      "check": 
        {
          "args": ["/data/consul/shell/check_mysql_mgr_master.sh"],
          "interval": "5s"
        }
    }
}
EOF

cat > /etc/consul.d/r-mysql-mgr-server-lhr.json <<"EOF"
{
  "service": [
    {
      "name": "r-mysql-mgr-server-lhr",
      "tags": ["MGR-Slave"],
      "address": "192.168.68.60",
      "port": 3306,
      "check": 
        {
          "args": ["/data/consul/shell/check_mysql_mgr_slave.sh"],
          "interval": "5s"
        }
    }
  ]
}
EOF

-- 检查配置文件是否正常
consul validate /etc/consul.d/

-- 重新加载配置文件
consul reload
 
-- 检查配置结果
[root@lhrmgr60 ~]# consul catalog services
consul
r-mysql-mgr-server-lhr
rw-mysql-mgr-server-lhr

注意：由于每台mysql server 上都有master、slave 检测脚本、而mysql server 只能是master 或者slave、所以存在失败的检测，master检测只有一个成功，slave检测只有一个失败 。

所有服务：

主库连接：

从库连接：

4.4、service测试

yum install -y bind-utils bind bind-chroot dnsmasq
dig @192.168.68.66  -p 8600 r-mysql-mgr-server-lhr.service.consul a
dig @192.168.68.66  -p 8600 rw-mysql-mgr-server-lhr.service.consul a

dig @127.0.0.1 -p 8600 MGR60.node.consul
dig @127.0.0.1 -p 8600 MGR61.node.consul
dig @127.0.0.1 -p 8600 MGR62.node.consul

测试结果：

[root@lhrmgr60 ~]# dig @192.168.68.66  -p 8600 r-mysql-mgr-server-lhr.service.consul a

; <<>> DiG 9.11.4-P2-RedHat-9.11.4-26.P2.el7_9.4 <<>> @192.168.68.66 -p 8600 r-mysql-mgr-server-lhr.service.consul a
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 7862
;; flags: qr aa rd; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1
;; WARNING: recursion requested but not available

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;r-mysql-mgr-server-lhr.service.consul. IN A

;; ANSWER SECTION:
r-mysql-mgr-server-lhr.service.consul. 0 IN A   192.168.68.62
r-mysql-mgr-server-lhr.service.consul. 0 IN A   192.168.68.61

;; Query time: 0 msec
;; SERVER: 192.168.68.66#8600(192.168.68.66)
;; WHEN: Wed Mar 10 10:52:12 CST 2021
;; MSG SIZE  rcvd: 98

[root@lhrmgr60 ~]# dig @192.168.68.66  -p 8600 rw-mysql-mgr-server-lhr.service.consul A

; <<>> DiG 9.11.4-P2-RedHat-9.11.4-26.P2.el7_9.4 <<>> @192.168.68.66 -p 8600 rw-mysql-mgr-server-lhr.service.consul a
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 13129
;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1
;; WARNING: recursion requested but not available

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;rw-mysql-mgr-server-lhr.service.consul.        IN A

;; ANSWER SECTION:
rw-mysql-mgr-server-lhr.service.consul. 0 IN A  192.168.68.60

;; Query time: 0 msec
;; SERVER: 192.168.68.66#8600(192.168.68.66)
;; WHEN: Wed Mar 10 10:52:17 CST 2021
;; MSG SIZE  rcvd: 83

可以看到，r-mysql-mgr-server-lhr.service.consul解析出来的地址是192.168.68.61和192.168.68.62，即2个从库；而rw-mysql-mgr-server-lhr.service.consul解析出来的地址为192.168.68.60，即主库。

五、配置DNS解析域名

App端配置域名服务器来解析consul后缀的域名，DNS解析及跳转， 有多个方案：

  1. 原内网dns服务器,做域名转发，consul后缀的，都转到consul server上
  2. dns全部跳到consul DNS服务器上，非consul后缀的,使用 recursors 属性跳转到原DNS服务器上
  3. dnsmaq 转： server=/consul/192.168.X.X#8600 解析consul后缀的
  4. 使用BIND配置DNS服务器

这里只列举dnsmasq这种方案，更多方法请参考官方文档：https://learn.hashicorp.com/tutorials/consul/dns-forwarding

5.1、使用dnsmasq来配置DNS解析

在192.168.66.69上配置dnsmasq。

docker rm -f lhrconsuldns69
docker run -d --name lhrconsuldns69 -h lhrconsuldns69 \
  --net=mhalhr --ip 192.168.68.69 \
  -p 53:53 \
  -v /sys/fs/cgroup:/sys/fs/cgroup \
  --privileged=true lhrbest/lhrcentos76:8.0 \
  /usr/sbin/init

docker network connect bridge lhrconsuldns69

docker exec -it lhrconsuldns69 bash

yum install -y bind-utils bind bind-chroot dnsmasq

echo "
server=/consul/192.168.68.66#8600
server=/consul/192.168.68.67#8600
server=/consul/192.168.68.68#8600
" > /etc/dnsmasq.d/10-consul

echo "
server=114.114.114.114
server=8.8.8.8
server=223.5.5.5
" >> /etc/dnsmasq.conf

-- 添加到所有机器，包括本机、3个client、3个server端等
echo "nameserver 192.168.68.69" > /etc/resolv.conf

systemctl enable dnsmasq
systemctl restart dnsmasq
systemctl status dnsmasq



dig @192.168.68.69  -p 53 r-mysql-mgr-server-lhr.service.consul a
dig @192.168.68.69  -p 53 rw-mysql-mgr-server-lhr.service.consul a


nslookup r-mysql-mgr-server-lhr.service.consul
nslookup rw-mysql-mgr-server-lhr.service.consul

ping r-mysql-mgr-server-lhr.service.consul -c 4
ping rw-mysql-mgr-server-lhr.service.consul -c 4

结果：

[root@lhrmgr60 /]# nslookup r-mysql-mgr-server-lhr.service.consul
nslookup rw-mysql-mgr-server-lhr.service.consulServer:          192.168.68.69
Address:        192.168.68.69#53

Name:   r-mysql-mgr-server-lhr.service.consul
Address: 192.168.68.62
Name:   r-mysql-mgr-server-lhr.service.consul
Address: 192.168.68.61

[root@lhrmgr60 /]# nslookup rw-mysql-mgr-server-lhr.service.consul
Server:         192.168.68.69
Address:        192.168.68.69#53

Name:   rw-mysql-mgr-server-lhr.service.consul
Address: 192.168.68.60

[root@lhrmgr60 /]# 
[root@lhrmgr60 /]# ping r-mysql-mgr-server-lhr.service.consul -c 4
PING r-mysql-mgr-server-lhr.service.consul (192.168.68.61) 56(84) bytes of data.
64 bytes from 192.168.68.61 (192.168.68.61): icmp_seq=1 ttl=64 time=0.083 ms
64 bytes from 192.168.68.61 (192.168.68.61): icmp_seq=2 ttl=64 time=0.065 ms
64 bytes from 192.168.68.61 (192.168.68.61): icmp_seq=3 ttl=64 time=0.108 ms
64 bytes from 192.168.68.61 (192.168.68.61): icmp_seq=4 ttl=64 time=0.084 ms

--- r-mysql-mgr-server-lhr.service.consul ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 7022ms
rtt min/avg/max/mdev = 0.065/0.085/0.108/0.015 ms
[root@lhrmgr60 /]# 
[root@lhrmgr60 /]# ping rw-mysql-mgr-server-lhr.service.consul -c 4
PING rw-mysql-mgr-server-lhr.service.consul (192.168.68.60) 56(84) bytes of data.
64 bytes from lhrmgr60 (192.168.68.60): icmp_seq=1 ttl=64 time=0.058 ms
64 bytes from lhrmgr60 (192.168.68.60): icmp_seq=2 ttl=64 time=0.070 ms
64 bytes from lhrmgr60 (192.168.68.60): icmp_seq=3 ttl=64 time=0.091 ms
64 bytes from lhrmgr60 (192.168.68.60): icmp_seq=4 ttl=64 time=0.071 ms

--- rw-mysql-mgr-server-lhr.service.consul ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 2999ms
rtt min/avg/max/mdev = 0.058/0.072/0.091/0.014 ms
[root@lhrmgr60 /]# 
[root@lhrmgr60 /]# dig @192.168.68.69  -p 53 r-mysql-mgr-server-lhr.service.consul a

; <<>> DiG 9.11.4-P2-RedHat-9.11.4-26.P2.el7_9.4 <<>> @192.168.68.69 -p 53 r-mysql-mgr-server-lhr.service.consul a
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 48770
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;r-mysql-mgr-server-lhr.service.consul. IN A

;; ANSWER SECTION:
r-mysql-mgr-server-lhr.service.consul. 0 IN A   192.168.68.62
r-mysql-mgr-server-lhr.service.consul. 0 IN A   192.168.68.61

;; Query time: 1 msec
;; SERVER: 192.168.68.69#53(192.168.68.69)
;; WHEN: Thu Mar 11 10:30:03 CST 2021
;; MSG SIZE  rcvd: 98

[root@lhrmgr60 /]# 
[root@lhrmgr60 /]# dig @192.168.68.69  -p 53 rw-mysql-mgr-server-lhr.service.consul a

; <<>> DiG 9.11.4-P2-RedHat-9.11.4-26.P2.el7_9.4 <<>> @192.168.68.69 -p 53 rw-mysql-mgr-server-lhr.service.consul a
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 47378
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;rw-mysql-mgr-server-lhr.service.consul.        IN A

;; ANSWER SECTION:
rw-mysql-mgr-server-lhr.service.consul. 0 IN A  192.168.68.60

;; Query time: 1 msec
;; SERVER: 192.168.68.69#53(192.168.68.69)
;; WHEN: Thu Mar 11 10:30:13 CST 2021
;; MSG SIZE  rcvd: 83

5.2、MySQL通过域名连接

[root@lhrmgr60 /]# mysql -uroot -plhr -hrw-mysql-mgr-server-lhr.service.consul
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 53753
Server version: 8.0.22 MySQL Community Server - GPL

Copyright (c) 2000, 2020, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> SELECT * FROM performance_schema.replication_group_members;
+---------------------------+--------------------------------------+---------------+-------------+--------------+-------------+----------------+
| CHANNEL_NAME              | MEMBER_ID                            | MEMBER_HOST   | MEMBER_PORT | MEMBER_STATE | MEMBER_ROLE | MEMBER_VERSION |
+---------------------------+--------------------------------------+---------------+-------------+--------------+-------------+----------------+
| group_replication_applier | 408acdb5-80bc-11eb-97a7-0242c0a8443d | 192.168.68.61 |        3306 | ONLINE       | SECONDARY   | 8.0.22         |
| group_replication_applier | 44c693d8-80bb-11eb-b4bb-0242c0a8443c | 192.168.68.60 |        3306 | ONLINE       | PRIMARY     | 8.0.22         |
| group_replication_applier | 9d5c3e3e-80bc-11eb-a0b2-0242c0a8443e | 192.168.68.62 |        3306 | ONLINE       | SECONDARY   | 8.0.22         |
+---------------------------+--------------------------------------+---------------+-------------+--------------+-------------+----------------+
3 rows in set (0.00 sec)

mysql> select @@hostname,@@report_host;
+------------+---------------+
| @@hostname | @@report_host |
+------------+---------------+
| lhrmgr60   | 192.168.68.60 |
+------------+---------------+
1 row in set (0.00 sec)

mysql> exit
Bye
[root@lhrmgr60 /]# mysql -uroot -plhr -hr-mysql-mgr-server-lhr.service.consul 
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 47616
Server version: 8.0.22 MySQL Community Server - GPL

Copyright (c) 2000, 2020, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> SELECT * FROM performance_schema.replication_group_members;
+---------------------------+--------------------------------------+---------------+-------------+--------------+-------------+----------------+
| CHANNEL_NAME              | MEMBER_ID                            | MEMBER_HOST   | MEMBER_PORT | MEMBER_STATE | MEMBER_ROLE | MEMBER_VERSION |
+---------------------------+--------------------------------------+---------------+-------------+--------------+-------------+----------------+
| group_replication_applier | 408acdb5-80bc-11eb-97a7-0242c0a8443d | 192.168.68.61 |        3306 | ONLINE       | SECONDARY   | 8.0.22         |
| group_replication_applier | 44c693d8-80bb-11eb-b4bb-0242c0a8443c | 192.168.68.60 |        3306 | ONLINE       | PRIMARY     | 8.0.22         |
| group_replication_applier | 9d5c3e3e-80bc-11eb-a0b2-0242c0a8443e | 192.168.68.62 |        3306 | ONLINE       | SECONDARY   | 8.0.22         |
+---------------------------+--------------------------------------+---------------+-------------+--------------+-------------+----------------+
3 rows in set (0.00 sec)

mysql> create database  lhrdb2;
ERROR 1290 (HY000): The MySQL server is running with the --super-read-only option so it cannot execute this statement

六、测试高可用

6.1、测试Consul Server的高可用

如下图所示，目前Consul Server有3台机器，组成一个集群，若其中任意一台机器宕机，都不能影响service的解析：

目前的状态：

[root@lhrmgr60 /]# consul members
Node   Address             Status  Type    Build  Protocol  DC   Segment
n66    192.168.68.66:8301  alive   server  1.9.4  2         dc1  <all>
n67    192.168.68.67:8301  alive   server  1.9.4  2         dc1  <all>
n68    192.168.68.68:8301  alive   server  1.9.4  2         dc1  <all>
MGR60  192.168.68.60:8301  alive   client  1.9.4  2         dc1  <default>
MGR61  192.168.68.61:8301  alive   client  1.9.4  2         dc1  <default>
MGR62  192.168.68.62:8301  alive   client  1.9.4  2         dc1  <default>
[root@lhrmgr60 /]# consul operator raft list-peers
Node  ID                                    Address             State     Voter  RaftProtocol
n68   43520b16-1b65-7d22-4172-6c2822070a44  192.168.68.68:8300  follower  true   3
n66   ca78760f-2f7e-f350-4e47-2db17e8719fe  192.168.68.66:8300  leader    true   3
n67   f80e2542-3d30-ca5a-af79-08879723c882  192.168.68.67:8300  follower  true   3

接下来，把n66、n67进行关机操作：

docker stop  lhrconsulmgr66 lhrconsulmgr67

查询集群状态：

[root@lhrmgr60 /]# consul members
Node   Address             Status  Type    Build  Protocol  DC   Segment
n66    192.168.68.66:8301  failed  server  1.9.4  2         dc1  <all>
n67    192.168.68.67:8301  failed  server  1.9.4  2         dc1  <all>
n68    192.168.68.68:8301  alive   server  1.9.4  2         dc1  <all>
MGR60  192.168.68.60:8301  alive   client  1.9.4  2         dc1  <default>
MGR61  192.168.68.61:8301  alive   client  1.9.4  2         dc1  <default>
MGR62  192.168.68.62:8301  alive   client  1.9.4  2         dc1  <default>
[root@lhrmgr60 /]# consul operator raft list-peers
Error getting peers: Failed to retrieve raft configuration: Unexpected response code: 500 (rpc error making call: No cluster leader)
[root@lhrmgr60 /]# consul catalog services
Error listing services: Unexpected response code: 500 (rpc error making call: No cluster leader)

查询域名是否正常使用：

dig @192.168.68.69  -p 53 r-mysql-mgr-server-lhr.service.consul a
dig @192.168.68.69  -p 53 rw-mysql-mgr-server-lhr.service.consul a


nslookup r-mysql-mgr-server-lhr.service.consul
nslookup rw-mysql-mgr-server-lhr.service.consul

ping r-mysql-mgr-server-lhr.service.consul -c 4
ping rw-mysql-mgr-server-lhr.service.consul -c 4

校验结果：

[root@lhrmgr60 /]# nslookup r-mysql-mgr-server-lhr.service.consul
Server:         192.168.68.69
Address:        192.168.68.69#53

Name:   r-mysql-mgr-server-lhr.service.consul
Address: 192.168.68.61
Name:   r-mysql-mgr-server-lhr.service.consul
Address: 192.168.68.62

[root@lhrmgr60 /]# 
[root@lhrmgr60 /]# nslookup rw-mysql-mgr-server-lhr.service.consul
Server:         192.168.68.69
Address:        192.168.68.69#53

Name:   rw-mysql-mgr-server-lhr.service.consul
Address: 192.168.68.60

可以看到，Consul Server集群的高可用运行正常。

6.2、测试MySQL的负载均衡和读写分离

首先测试读负载均衡：

[root@lhrmgr60 /]# for i in $(seq 1 10); do mysql -uroot -plhr -hr-mysql-mgr-server-lhr.service.consul -P3306 \
> -e 'select @@server_id;'; done | egrep '[0-9]'
mysql: [Warning] Using a password on the command line interface can be insecure.
802233061
mysql: [Warning] Using a password on the command line interface can be insecure.
802233061
mysql: [Warning] Using a password on the command line interface can be insecure.
802233062
mysql: [Warning] Using a password on the command line interface can be insecure.
802233062
mysql: [Warning] Using a password on the command line interface can be insecure.
802233062
mysql: [Warning] Using a password on the command line interface can be insecure.
802233061
mysql: [Warning] Using a password on the command line interface can be insecure.
802233061
mysql: [Warning] Using a password on the command line interface can be insecure.
802233061
mysql: [Warning] Using a password on the command line interface can be insecure.
802233062
mysql: [Warning] Using a password on the command line interface can be insecure.
802233061

可以看到，读操作被分配到61和62主机上。

读写分离由于是通过不同的主机域名进行连接的，之前已经测试过，所以，这里就不再测试。

6.3、测试MGR高可用

目前192.168.68.60为主库，192.168.68.61和192.168.68.62为从库，所以，我们把192.168.68.60关机，然后通过域名来连接，检查能否正常连接。

[root@lhrmgr60 /]# mysql -uroot -plhr -hrw-mysql-mgr-server-lhr.service.consul -P3306
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 54447
Server version: 8.0.22 MySQL Community Server - GPL

Copyright (c) 2000, 2020, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> select @@hostname,@@report_host;
+------------+---------------+
| @@hostname | @@report_host |
+------------+---------------+
| lhrmgr60   | 192.168.68.60 |
+------------+---------------+
1 row in set (0.00 sec)

mysql> SELECT * FROM performance_schema.replication_group_members;
+---------------------------+--------------------------------------+---------------+-------------+--------------+-------------+----------------+
| CHANNEL_NAME              | MEMBER_ID                            | MEMBER_HOST   | MEMBER_PORT | MEMBER_STATE | MEMBER_ROLE | MEMBER_VERSION |
+---------------------------+--------------------------------------+---------------+-------------+--------------+-------------+----------------+
| group_replication_applier | 408acdb5-80bc-11eb-97a7-0242c0a8443d | 192.168.68.61 |        3306 | ONLINE       | SECONDARY   | 8.0.22         |
| group_replication_applier | 44c693d8-80bb-11eb-b4bb-0242c0a8443c | 192.168.68.60 |        3306 | ONLINE       | PRIMARY     | 8.0.22         |
| group_replication_applier | 9d5c3e3e-80bc-11eb-a0b2-0242c0a8443e | 192.168.68.62 |        3306 | ONLINE       | SECONDARY   | 8.0.22         |
+---------------------------+--------------------------------------+---------------+-------------+--------------+-------------+----------------+
3 rows in set (0.01 sec)

mysql> shutdown ;
Query OK, 0 rows affected (0.00 sec)

mysql> select @@hostname,@@report_host;
ERROR 2013 (HY000): Lost connection to MySQL server during query

mysql> select @@hostname,@@report_host;
+------------+---------------+
| @@hostname | @@report_host |
+------------+---------------+
| lhrmgr61   | 192.168.68.61 |
+------------+---------------+
1 row in set (0.00 sec)

mysql> SELECT * FROM performance_schema.replication_group_members;
+---------------------------+--------------------------------------+---------------+-------------+--------------+-------------+----------------+
| CHANNEL_NAME              | MEMBER_ID                            | MEMBER_HOST   | MEMBER_PORT | MEMBER_STATE | MEMBER_ROLE | MEMBER_VERSION |
+---------------------------+--------------------------------------+---------------+-------------+--------------+-------------+----------------+
| group_replication_applier | 408acdb5-80bc-11eb-97a7-0242c0a8443d | 192.168.68.61 |        3306 | ONLINE       | PRIMARY     | 8.0.22         |
| group_replication_applier | 9d5c3e3e-80bc-11eb-a0b2-0242c0a8443e | 192.168.68.62 |        3306 | ONLINE       | SECONDARY   | 8.0.22         |
+---------------------------+--------------------------------------+---------------+-------------+--------------+-------------+----------------+
2 rows in set (0.00 sec)


[root@lhrmgr60 /]# nslookup rw-mysql-mgr-server-lhr.service.consul
Server:         192.168.68.69
Address:        192.168.68.69#53

Name:   rw-mysql-mgr-server-lhr.service.consul
Address: 192.168.68.61

[root@lhrmgr60 /]# nslookup r-mysql-mgr-server-lhr.service.consul 
Server:         192.168.68.69
Address:        192.168.68.69#53

Name:   r-mysql-mgr-server-lhr.service.consul
Address: 192.168.68.62

可以看到，MGR的高可用也运行正常。

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MySQL 数据库
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