What should be the ports for group replication if we are implementing group replication on three different MySQL servers? The my.cnf for the first server is

loose-group_replication_local_address= "x.x.x.x:3307"
loose-group_replication_group_seeds= "x.x.x.x:3307,x.x.x.x:3307,x.x.x.x:3307"

For the second server the settings are same and I have changed the IP's in loose-group_replication_local_address accordingly, but I am facing this error when running start GROUP_REPLICATION:

[ERROR] Plugin group_replication reported: '[GCS] The member was unable to join the group. Local port: 3307'

Does any one know the solution?

  • Are you in the same machine with different network interfaces or in different machines? Is there any other error in the log? If you are on different machines, are the machines accessible among themselves? Commented Mar 29, 2017 at 10:34
  • i am on different machine and yes the machines are accessible among themselves. Commented Mar 30, 2017 at 11:24

2 Answers 2


In the manuel they advise to use port 33061. https://dev.mysql.com/doc/refman/5.7/en/group-replication-configuring-instances.html :

"The recommended port for group_replication_local_address is 33061"


Make sure that you use same data inside databases between hosts, Make mysqldump from master and import all data to slave, after I configured slave and it works.

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