原 【DB宝45】MySQL高可用之MGR+Consul架构部署
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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：
- 原内网dns服务器,做域名转发，consul后缀的，都转到consul server上
- 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
- dnsmaq 转： server=/consul/192.168.X.X#8600 解析consul后缀的
- 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。
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 | 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：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 | [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
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 | [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 |
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