MySQL Bugs: #107176: Dual stack ubuntu group replication setup fails on add instance

Bug #107176	Dual stack ubuntu group replication setup fails on add instance
Submitted:	2 May 2022 10:24	Modified:	19 Jun 2022 13:30
Reporter:	Peter Doten	Email Updates:
Status:	No Feedback	Impact on me:	None
Category:	MySQL Server: Group Replication	Severity:	S2 (Serious)
Version:	8.0.28	OS:	Ubuntu (20.04 LTS)
Assigned to:	Assigned Account	CPU Architecture:	Any

Description:
After creating Innodb cluster on Ubuntu primary node, set cluster variable via 
var cluster = dba.getCluster().
we see node working and is primary, see cluster working with one node.
Tried to add another node via
cluster.addInstance('clusteradmin@yournodeFQDNhere:3306') with valid FQDN. Operation times out with error 
Connection attempt from IP address ::ffff:x.x.x.x refused. Address is not in the IP whitelist.
The allow list is correct. group_replication_local_address is set properly, report_host is set properly in
/etc/mysql/mysql.conf.d/mysqld.cnf.  bind-address and mysqlx-bind-address are set to host IP address.

Tried to use IP address in addInstance command, no luck.
Did a netstat -tulpn on the OS, found the all GR ports are IPv6 with the exception of 33061. IPv6 is grabbing that one.

How to repeat:
Install Ubuntu 20.04 LTS on three VMs in different subnets.
-disable ufw
-disable selinux

Configure each node
1. mysqlsh --log-level=DEBUG3
2. dba.configureLocalInstance("root@localhost:3306");
	create clusteradmin account when asked
On all nodes
set values in /etc/mysql/mysql.conf.d/mysqld.cnf to allow access.
establish GR on one VM, try to add instance.

Suggested fix:
ensure that GR port binds to IPv6 if all others are bound to it.

Meant to state that GR ports are on IPv4 with the exception of 33061 which is on IPv6.

Hi,

Please check whether the port that you specified is correct .....

No feedback was provided for this bug for over a month, so it is
being suspended automatically. If you are able to provide the
information that was originally requested, please do so and change
the status of the bug back to "Open".