[已解决] BUG 报告【 greatdb_ha_mgr_vip_broad 默认值非最佳实践】

802 1 2023-9-22 14:16

本帖最后由 chongzh 于 2023-9-22 14:18 编辑

Gitee ：https://gitee.com/GreatSQL/GreatSQL/issues/I83JHV?from=project-issue

【使用版本】
8.0.32-24

【使用环境】
生产环境 or 测试环境

【问题描述】如果反馈是误报，我将及时删除

greatdb_ha_mgr_vip_broad 缺省默认为 255.255.255.255, 缺少正确的参数配置指引

官方手册 https://greatsql.cn/docs/8032/user-manual/5-enhance/5-2-ha-mgr-vip.html
[mysqld]
plugin-load-add=greatdb_ha.so
loose-greatdb_ha_enable_mgr_vip=1
loose-greatdb_ha_mgr_vip_ip =172.26.170.91
loose-greatdb_ha_mgr_vip_mask=255.255.255.255
loose-greatdb_ha_mgr_vip_nic=ens160

【复现路径】

my.cnf 正确配置：greatdb_ha_mgr_vip_broad 指定为 vip地址且 greatdb_ha_mgr_vip_mask 指定为 255.255.255.255

(Fri Sep 22 09:31:41 2023)[root@GreatSQL][(none)]>show variables like '%vip%';
+---------------------------------+-----------------+
| Variable_name | Value |
+---------------------------------+-----------------+
| greatdb_ha_enable_mgr_vip | ON |
| greatdb_ha_force_change_mgr_vip | OFF |
| greatdb_ha_mgr_vip_broad | 172.26.170.91 |
| greatdb_ha_mgr_vip_ip | 172.26.170.91 |
| greatdb_ha_mgr_vip_mask | 255.255.255.255 |
| greatdb_ha_mgr_vip_nic | ens160 |
+---------------------------------+-----------------+
6 rows in set (0.00 sec)
[root@test_cdh_003 ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: ens160: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether 00:50:56:b2:2d:45 brd ff:ff:ff:ff:ff:ff
inet 172.26.170.15/25 brd 172.26.170.127 scope global ens160
valid_lft forever preferred_lft forever
inet 172.26.170.91/32 brd 172.26.255.255 scope global ens160:0
valid_lft forever preferred_lft forever
inet6 fe80::250:56ff:feb2:2d45/64 scope link
valid_lft forever preferred_lft forever
[root@test_cdh_003 ~]# cat /etc/sysconfig/network-scripts/ifcfg-ens160
TYPE=Ethernet
BOOTPROTO=static
NAME=ens160
DEVICE=ens160
ONBOOT=yes
IPADDR=172.26.170.15
NETMASK=255.255.255.128
GATEWAY=172.26.170.126
DNS1=172.26.177.118
DNS2=172.26.187.110

——————————————————————————————————

my.cnf 错误配置：greatdb_ha_mgr_vip_broad 为默认缺省为 255.255.255.255

(Fri Sep 22 09:42:40 2023)[root@GreatSQL][(none)]>show variables like '%vip%';
+---------------------------------+-----------------+
| Variable_name | Value |
+---------------------------------+-----------------+
| greatdb_ha_enable_mgr_vip | ON |
| greatdb_ha_force_change_mgr_vip | OFF |
| greatdb_ha_mgr_vip_broad | 255.255.255.255 |
| greatdb_ha_mgr_vip_ip | 172.26.170.91 |
| greatdb_ha_mgr_vip_mask | 255.255.255.255 |
| greatdb_ha_mgr_vip_nic | ens160 |
+---------------------------------+-----------------+

【问题现象及影响】

#my.cnf 正确配置的情况下，切换后异机可以在不同的网段在没有主动/手动 ARP 刷新的情况下，可以直接与vip正常通信
[root@IOV-DB-MYSQL101 ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
link/ether 00:50:56:b8:54:52 brd ff:ff:ff:ff:ff:ff
inet 172.26.171.18/25 brd 172.26.171.127 scope global eth0
valid_lft forever preferred_lft forever
inet6 fe80::250:56ff:feb8:5452/64 scope link
valid_lft forever preferred_lft forever
[root@IOV-DB-MYSQL101 ~]# ping 172.26.170.91
PING 172.26.170.91 (172.26.170.91) 56(84) bytes of data.
64 bytes from 172.26.170.91: icmp_seq=1 ttl=56 time=0.470 ms
64 bytes from 172.26.170.91: icmp_seq=2 ttl=56 time=0.598 ms
^C
--- 172.26.170.91 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1555ms
rtt min/avg/max/mdev = 0.470/0.534/0.598/0.064 ms
————————————————————————————————————
#my.cnf 错误配置的情况下，切换后异机可以在不同的网段在没有主动/手动 ARP 刷新的情况下，不可以直接与vip正常通信
[root@IOV-DB-MYSQL101 ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
link/ether 00:50:56:b8:54:52 brd ff:ff:ff:ff:ff:ff
inet 172.26.171.18/25 brd 172.26.171.127 scope global eth0
valid_lft forever preferred_lft forever
inet6 fe80::250:56ff:feb8:5452/64 scope link
valid_lft forever preferred_lft forever
[root@IOV-DB-MYSQL101 ~]# ping 172.26.170.91
PING 172.26.170.91 (172.26.170.91) 56(84) bytes of data.
From 172.26.170.14 icmp_seq=1 Destination Host Unreachable
From 172.26.170.14 icmp_seq=2 Destination Host Unreachable
From 172.26.170.14 icmp_seq=3 Destination Host Unreachable
From 172.26.170.14 icmp_seq=4 Destination Host Unreachable
^C
--- 172.26.170.91 ping statistics ---
5 packets transmitted, 0 received, +4 errors, 100% packet loss, time 4562ms
pipe 4

【对该问题有什么建议】
为了在任何网络环境都能够正常通信或者切换不影响vip对外可用性

建议将参数最佳实践的配置为 greatdb_ha_mgr_vip_ip 为vip地址、greatdb_ha_mgr_vip_broad 为vip地址，greatdb_ha_mgr_vip_mask=255.255.255.255 （请帮忙确认该认知是否正确，以及这样配置有无风险）
[mysqld]
plugin-load-add=greatdb_ha.so
loose-greatdb_ha_enable_mgr_vip=1
loose-greatdb_ha_mgr_vip_ip = vip地址
loose-greatdb_ha_mgr_vip_mask=255.255.255.255
loose-greatdb_ha_mgr_vip_nic=ens160
greatdb_ha_mgr_vip_broad=vip地址

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